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JP5584163B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP5584163B2
JP5584163B2 JP2011094691A JP2011094691A JP5584163B2 JP 5584163 B2 JP5584163 B2 JP 5584163B2 JP 2011094691 A JP2011094691 A JP 2011094691A JP 2011094691 A JP2011094691 A JP 2011094691A JP 5584163 B2 JP5584163 B2 JP 5584163B2
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hot water
water storage
amount
storage tank
predetermined
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JP2012225601A (en
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和也 佐山
靖 阿久津
正敏 米山
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Corona Corp
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Description

本発明は、特定時間帯に貯湯タンク内の湯水を沸き上げ、特定時間外に湯切れしないように貯湯タンク内の湯水を沸き増すようにした貯湯式給湯装置に関するものである。   The present invention relates to a hot water storage type hot water supply apparatus that boils hot water in a hot water storage tank during a specific time period and increases the hot water in the hot water storage tank so that the hot water does not run out of the specific time.

従来よりこの種の貯湯式給湯装置においては、湯水を貯湯する貯湯タンクと、この貯湯タンクに給水する給水管と、貯湯タンクから出湯する出湯管と、貯湯タンクの湯水を加熱する加熱手段と、過去所定期間の一日ごとの給湯量を記憶する給湯量記憶手段と、貯湯タンク内の貯湯量を検出する貯湯量検出手段と、特定時間帯に貯湯タンク内の湯水を沸き上げるよう加熱手段を制御する制御手段とを備え、所定期間における平均給湯量と標準偏差とから目標貯湯量を算出し、深夜時間帯に沸き上げきれなかった分があった場合、昼間時間帯に残湯量が沸き増し開始貯湯量まで減少すると沸き増すようにしたもので、沸き増し開始貯湯量を標準偏差が大きい場合に多い値とし、標準偏差が小さい場合に少ない値としたものがあった(特許文献1)。   Conventionally, in this type of hot water storage hot water supply apparatus, a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, a heating means for heating the hot water in the hot water storage tank, Hot water storage means for storing the amount of hot water supplied per day for a predetermined period in the past, hot water storage detection means for detecting the amount of hot water stored in the hot water storage tank, and heating means for boiling hot water in the hot water storage tank at a specific time zone Control means to control, the target hot water storage amount is calculated from the average hot water supply amount and standard deviation during a predetermined period, and if there is a part that could not be heated up at midnight, the remaining hot water amount will increase at daytime The amount of boiling hot water is increased when the standard deviation is large, and is decreased when the standard deviation is small (Patent Document 1).

特開2008−89208号公報(段落0039、0040)JP 2008-89208 A (paragraphs 0039 and 0040)

ところが、この従来のものでは、一日の給湯量のバラツキ(標準偏差)が大きく沸き増し開始貯湯量が多い値に設定されている状況では、浴槽への湯張りが行われなかった日など給湯量が平均給湯量未満の場合は多量の湯が余ってしまうという課題があった。   However, in this conventional system, in a situation where the variation in the amount of hot water supply (standard deviation) per day is large and the start hot water storage amount is set to a large value, the hot water supply such as the day when the hot water is not filled in the bathtub When the amount is less than the average hot water supply amount, there is a problem that a large amount of hot water is left.

そこで、本発明は上記課題を解決するため、請求項1では、湯水を貯湯する貯湯タンクと、この貯湯タンクに給水する給水管と、前記貯湯タンクから出湯する出湯管と、前記貯湯タンクの湯水を加熱する加熱手段と、過去所定期間の一日ごとの給湯量を記憶する給湯量記憶手段と、前記貯湯タンク内の貯湯量を検出する貯湯量検出手段と、特定時間帯に前記貯湯タンク内の湯水を沸き上げるよう前記加熱手段を制御する制御手段とを備えたものにおいて、前記制御手段は、前記給湯量記憶手段の記憶内容に基づき過去の所定期間における平均給湯量と給湯量のバラツキ度合を算出し、前記平均給湯量が前記貯湯タンクの満タン容量より多い所定量以上、または前記平均給湯量が前記所定量未満かつ前記バラツキ度合が所定値未満の場合には、特定時間帯外に前記貯湯量検出手段が所定の第1沸き増し開始貯湯量未満を検出すると前記貯湯タンク内の湯水を沸き増すよう前記加熱手段を制御し、前記平均給湯量が前記所定量未満かつ前記バラツキ度合が前記所定値以上の場合には、特定時間帯外に前記貯湯量検出手段が前記第1沸き増し開始貯湯量よりも少ない所定の第2沸き増し開始貯湯量未満を検出すると前記貯湯タンク内の湯水を沸き増すよう前記加熱手段を制御するようにした。   Accordingly, in order to solve the above problems, the present invention provides a hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, and hot water for the hot water storage tank. Heating means for heating the hot water, hot water storage means for storing the hot water supply amount for each day in the past predetermined period, hot water storage detection means for detecting the hot water storage amount in the hot water storage tank, and the hot water storage tank in a specific time zone Control means for controlling the heating means so as to boil the hot water of the hot water, the control means is based on the stored contents of the hot water supply amount storage means, the degree of variation of the average hot water supply amount and the hot water supply amount in the past predetermined period When the average hot water supply amount is a predetermined amount greater than the full tank capacity of the hot water storage tank or the average hot water supply amount is less than the predetermined amount and the variation degree is less than a predetermined value, If the hot water storage amount detection means detects less than a predetermined first boiling start hot water storage amount outside a fixed time period, the heating means is controlled to increase boiling water in the hot water storage tank, and the average hot water supply amount is less than the predetermined amount. When the variation degree is equal to or greater than the predetermined value, the hot water storage amount detection means detects less than a predetermined second boiling start hot water storage amount that is less than the first boiling start hot water storage amount outside the specific time period. The heating means was controlled so as to boil hot water in the hot water storage tank.

また、請求項2では、請求項1のものにおいて、前記貯湯量検出手段は、前記貯湯タンクの側面上下に複数設けられた貯湯温度センサを備え、前記複数の貯湯温度センサのうち予め定められた第1貯湯温度センサが第1所定温度未満を検出すると前記第1沸き増し開始貯湯量未満であると判別し、前記複数の貯湯温度センサのうち前記第1貯湯温度センサよりも高い位置にある予め定められた第2貯湯温度センサが第2所定温度未満を検出すると前記第2沸き増し開始貯湯量未満であると判別するようにした。   Further, in claim 2, according to claim 1, the hot water storage amount detection means includes a plurality of hot water storage temperature sensors provided above and below the side surface of the hot water storage tank, and is preset among the plurality of hot water storage temperature sensors. When the first hot water storage temperature sensor detects a temperature lower than the first predetermined temperature, it is determined that the temperature is lower than the first boiling start hot water storage amount, and the temperature is higher than the first hot water storage temperature sensor among the plurality of hot water storage temperature sensors in advance. When the determined second hot water storage temperature sensor detects a temperature lower than the second predetermined temperature, it is determined that the temperature is lower than the second boiling start hot water storage amount.

ここで、第1所定温度と第2所定温度の関係は、第2沸き増し開始貯湯量が第1沸き増し開始貯湯量未満となるように定めればよいものである。   Here, the relationship between the first predetermined temperature and the second predetermined temperature may be determined so that the second boiling start hot water storage amount is less than the first boiling start hot water storage amount.

また、請求項3では、請求項1または2のものにおいて、前記制御手段は、前記平均給湯量が前記貯湯タンクの満タン容量以下の場合は、前記バラツキ度合に関係なく特定時間帯外に前記貯湯量検出手段が前記第2沸き増し開始貯湯量未満を検出すると沸き増すよう前記加熱手段を制御するようにした。   Moreover, in Claim 3, in the thing of Claim 1 or 2, when the said average hot water supply amount is below the full tank capacity | capacitance of the said hot water storage tank, the said control means outside the specific time slot | zone irrespective of the said dispersion | variation degree. When the hot water storage amount detecting means detects less than the second boiling start hot water storage amount, the heating means is controlled to increase boiling.

また、請求項4では、請求項1〜3のいずれかのものにおいて、前記加熱手段は、前記貯湯タンク下部から取り出した湯水を前記貯湯タンク上部に戻す加熱循環回路と、この加熱循環回路途中に設けられたヒートポンプ式加熱器と、前記加熱循環回路途中に設けられた加熱循環ポンプによって構成されているものとした。   Moreover, in Claim 4, in any one of Claims 1-3, the said heating means returns the hot water taken out from the said hot water storage tank to the said hot water tank upper part, and the heating circulation circuit in the middle of this heating circuit The heat pump heater is provided and a heating circulation pump provided in the middle of the heating circulation circuit.

本発明によれば、平均給湯量が貯湯タンクの満タン容量より多い所定量未満かつ満タン容量以上で、かつバラツキ度合が所定値より大きい場合、日々の給湯量のバラツキが大きい使い方をされており沸き増しが不要な程度しか給湯されない日があるが、そのような場合は、所定の沸き増し開始貯湯量を少ない値(第2沸き増し開始貯湯量)としているため、不要な沸き増しを極力行わずに湯余りを防止できる。また、平均給湯量が所定量未満でバラツキ度合が所定値以下の場合は、日々安定して平均給湯量程度の給湯を行っているため、沸き増し開始貯湯量を多い値(第1沸き増し開始貯湯量)として、平均給湯量を早めに沸き上げて湯切れの発生を確実に防止することができる。さらに、平均給湯量が所定量以上の場合は、バラツキ度合に関係なく沸き増し開始貯湯量を多い値(第1沸き増し開始貯湯量)としているので、貯湯量が減ると素早く沸き増しが開始されて湯切れの発生を防止することができる。   According to the present invention, when the average hot water supply amount is less than a predetermined amount greater than the full tank capacity of the hot water storage tank and greater than or equal to the full tank capacity, and the variation degree is greater than the predetermined value, the daily hot water supply variation is large. There are days when hot water is only supplied to the extent that no additional boiling is required. In such a case, the specified amount of hot water at the start of boiling increase is set to a small value (the amount of hot water at the start of second boiling). Hot water can be prevented without performing it. In addition, when the average hot water supply amount is less than the predetermined amount and the variation degree is less than the predetermined value, the hot water supply is stably carried out about the average hot water amount every day. As the amount of hot water stored), the average amount of hot water can be boiled up early, and the occurrence of hot water can be reliably prevented. In addition, when the average hot water supply amount is greater than or equal to the predetermined amount, the boiling increase start hot water storage amount is set to a large value (the first boiling start hot water storage amount) regardless of the degree of variation. The occurrence of hot water can be prevented.

また、平均給湯量が貯湯タンクの満タン容量よりも少ない場合は、所定の沸き増し開始貯湯量を少ない値(第2沸き増し開始貯湯量)とするため、不要な沸き増しを極力行わずに湯余りを防止できる。   In addition, when the average hot water supply amount is less than the full tank capacity of the hot water storage tank, the predetermined boiling start hot water storage amount is set to a small value (second hot water starting hot water storage amount), so that unnecessary hot water increase is avoided as much as possible. You can prevent excess water.

本発明の一実施形態の概略構成図Schematic configuration diagram of one embodiment of the present invention 同一実施形態の沸き上げ動作を説明するフローチャートFlowchart explaining boiling operation of the same embodiment 同一実施形態の沸き増し動作を説明するフローチャートFlowchart for explaining the heating operation of the same embodiment 同一実施形態の過去所定期間の給湯量とバラツキ度合の関係を説明する図The figure explaining the relationship between the amount of hot water supply of the past predetermined period and variation degree of the same embodiment

次に、本発明の一実施形態の貯湯式給湯装置を図面に基づいて説明する。
1は湯水を貯湯する貯湯タンク(ここではタンク容積185L)、2は貯湯タンク1に給水する給水管、3は給水管2に設けられ給水圧を減圧する減圧弁、4は貯湯タンク1上部から出湯する出湯管、5は出湯管4に設けられ過圧を逃がす過圧逃がし弁、6は減圧弁3の下流側の給水管2から分岐した給水バイパス管、7は出湯管4からの湯水と給水バイパス管6からの水とを混合する給湯混合弁、8は給湯混合弁7からの湯水を給湯する給湯管、9は給湯管8に設けられた給湯温度センサ、10は給湯管8を流れる流量を検出する給湯流量センサ、11は給水温度を検出する給水温度センサ、12は給湯栓である。
Next, a hot water storage type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a hot water storage tank for storing hot water (here, tank volume 185 L), 2 a water supply pipe for supplying water to the hot water storage tank 1, 3 a pressure reducing valve provided in the water supply pipe 2 for reducing the water supply pressure, 4 from the upper part of the hot water storage tank 1 A hot water discharge pipe 5 for discharging hot water is provided in the hot water discharge pipe 4 to release overpressure, 6 is a water supply bypass pipe branched from the water supply pipe 2 on the downstream side of the pressure reducing valve 3, and 7 is hot water from the hot water discharge pipe 4. A hot water supply mixing valve that mixes water from the water supply bypass pipe 6, 8 is a hot water supply pipe that supplies hot water from the hot water supply mixing valve 7, 9 is a hot water temperature sensor provided in the hot water supply pipe 8, and 10 flows through the hot water supply pipe 8. A hot water supply flow sensor for detecting the flow rate, 11 is a water supply temperature sensor for detecting the temperature of the water supply, and 12 is a hot water tap.

13は浴槽、14は貯湯タンク1内の上部に設けたふろ熱交換器、15は浴槽13とふろ熱交換器14とを浴槽水が循環可能に接続しているふろ循環回路、16はふろ循環回路15途中に設けられたふろ循環ポンプ、17は浴槽13からふろ熱交換器14へ戻る浴槽水の温度を検出するふろ戻り温度センサ、18はふろ熱交換器14から浴槽13へ往く浴槽水の温度を検出するふろ往き温度センサ、19は浴槽13内の水位を圧力により検出する水位センサ、20は給湯管8から分岐されてふろ循環回路15へ接続された湯張り管、21は湯張り管20の開閉を行う湯張り電磁弁である。   13 is a bathtub, 14 is a bath heat exchanger provided in the upper part of the hot water storage tank 1, 15 is a bath circulation circuit in which bath water is circulated between the bathtub 13 and the bath heat exchanger 14, and 16 is a bath circulation. A bath circulation pump provided in the middle of the circuit 15, 17 is a bath return temperature sensor that detects the temperature of the bath water returning from the bath 13 to the bath heat exchanger 14, and 18 is bath water that travels from the bath heat exchanger 14 to the bath 13. A temperature sensor for detecting the temperature, 19 is a water level sensor for detecting the water level in the bathtub 13 by pressure, 20 is a hot water pipe branched from the hot water supply pipe 8 and connected to the bath circulation circuit 15, and 21 is a hot water pipe. This is a hot water solenoid valve that opens and closes 20.

22は貯湯タンク1の側面上下に複数設けられ各部の貯湯温度を検出して貯湯量を検出する貯湯量検出手段としての貯湯温度センサであり、ここでは、貯湯温度センサ22aは20L、貯湯温度センサ22bは60L、貯湯温度センサ22cは100L、貯湯温度センサ22dは140L、貯湯温度センサ22eは180Lの容積位置の貯湯温度を検出するものである。   Reference numeral 22 denotes a hot water storage temperature sensor provided as a hot water storage amount detecting means for detecting a hot water storage amount by detecting a hot water storage temperature of each part, provided on the upper and lower sides of the hot water storage tank 1. Here, the hot water storage temperature sensor 22a is 20L. The hot water storage temperature sensor 22c detects the hot water storage temperature at a volume position of 60L, the hot water storage temperature sensor 22c is 100L, the hot water storage temperature sensor 22d is 140L, and the hot water storage temperature sensor 22e is 180L.

23は冷媒を圧縮する圧縮機、24は冷媒と湯水を熱交換する給湯熱交換器、25は冷媒を減圧膨張する膨張弁、26は低温冷媒を蒸発させる蒸発器としての空気熱交換器、27は空気熱交換器26に外気を送風する送風ファンであり、これら圧縮機23、給湯熱交換器24、減圧手段25、空気熱交換器26を冷媒配管28で環状に接続し、ヒートポンプ式加熱器29を構成している。   23 is a compressor that compresses the refrigerant, 24 is a hot water supply heat exchanger that exchanges heat between the refrigerant and hot water, 25 is an expansion valve that decompresses and expands the refrigerant, 26 is an air heat exchanger as an evaporator that evaporates the low-temperature refrigerant, 27 Is a blower fan that blows outside air to the air heat exchanger 26. The compressor 23, the hot water supply heat exchanger 24, the pressure reducing means 25, and the air heat exchanger 26 are connected in a ring shape by a refrigerant pipe 28, and a heat pump heater 29 is constituted.

30は貯湯タンク1の下部と給湯熱交換器24の入口とを接続し、給湯熱交換器24の出口と貯湯タンク1の上部とを接続する加熱循環回路、31は給湯熱交換器24入口側の加熱循環回路30に設けられ貯湯タンク1下部から取り出した湯水を給湯熱交換器24を介して貯湯タンク1上部に循環させる加熱循環ポンプ、32は給湯熱交換器24に流入する湯水の温度を検出する入水温度センサ、33は給湯熱交換器24から流出する湯水の温度を検出する沸き上げ温度センサ、34は外気温度を検出する外気温度センサである。   A heating circulation circuit 30 connects the lower part of the hot water storage tank 1 and the inlet of the hot water supply heat exchanger 24, connects the outlet of the hot water supply heat exchanger 24 and the upper part of the hot water storage tank 1, and 31 is the inlet side of the hot water supply heat exchanger 24 A heating circulation pump provided in the heating circulation circuit 30 for circulating hot water extracted from the lower part of the hot water storage tank 1 to the upper part of the hot water storage tank 1 through the hot water supply heat exchanger 24, and 32 indicates the temperature of the hot water flowing into the hot water supply heat exchanger 24. An incoming water temperature sensor 33 to detect, a boiling temperature sensor 33 to detect the temperature of hot water flowing out from the hot water supply heat exchanger 24, and an outside air temperature sensor 34 to detect the outside air temperature.

そして、ヒートポンプ式加熱器29と加熱循環回路30と加熱循環ポンプ31とで貯湯タンク1内の湯水をに沸き上げる加熱手段を構成しており、予め定められた一定の加熱能力W(ここでは4.5kW)で作動するように圧縮機23、減圧手段25、送風ファン27、加熱循環ポンプ31が制御されるもので、貯湯タンク1下部から取り出した湯を目標沸き上げ温度Tsまで加熱して貯湯タンク1上部に積層状に戻すようにしているため沸き上げる湯量を自在にコントロールできるものである。   The heat pump heater 29, the heating circulation circuit 30, and the heating circulation pump 31 constitute heating means for boiling the hot water in the hot water storage tank 1, and a predetermined heating capacity W (here, 4). The compressor 23, the pressure reducing means 25, the blower fan 27, and the heating circulation pump 31 are controlled so as to operate at 5 kW). The hot water taken out from the lower part of the hot water storage tank 1 is heated to the target boiling temperature Ts to store the hot water. The amount of hot water to be boiled can be freely controlled because the upper part of the tank 1 is returned to the laminated state.

35は給湯温度や各種必要な設定を行うためのリモートコントローラで、給湯設定温度やふろ設定温度を表示する表示部36と、給湯設定温度およびふろ設定温度を設定する温度設定スイッチ37と、浴槽13への所定湯量の湯張りに続いて所定の保温時間だけ保温運転を行わせるふろスイッチ38と、浴槽水を加熱する追焚き動作を行わせる追焚きスイッチ39とを備えている。   Reference numeral 35 denotes a remote controller for performing hot water supply temperature and various necessary settings, a display unit 36 for displaying hot water set temperature and bath set temperature, a temperature setting switch 37 for setting hot water set temperature and bath set temperature, and bathtub 13. A bath switch 38 for performing a heat retaining operation for a predetermined heat retaining time following the filling of a predetermined amount of hot water to the water and a reheating switch 39 for performing a reheating operation for heating the bath water are provided.

40はこの貯湯式給湯装置の作動を制御する制御手段で、予め作動を制御するためのプログラムが記憶されていると共に、演算、比較、記憶機能、カウント機能を有し、給湯温度センサ9、給湯流量センサ10、給水温度センサ11、ふろ戻り温度センサ17、ふろ往き温度センサ18、水位センサ19、貯湯温度センサ22a〜e、入水温度センサ32、沸き上げ温度センサ33、外気温センサ34にて検出される値が入力され、給湯混合弁7、ふろ循環ポンプ16、湯張り電磁弁21、圧縮機23、膨張弁25、送風ファン27、加熱循環ポンプ31の駆動を制御し、沸き上げ動作、給湯動作やふろ加熱動作等を制御するもので、リモートコントローラ35と通信可能に接続されているものである。さらに、制御手段40には、貯湯タンク1からの給湯量を積算記憶する給湯量記憶手段41が設けられているものである。   Reference numeral 40 denotes a control means for controlling the operation of the hot water storage type hot water supply apparatus, which stores a program for controlling the operation in advance and has a calculation, comparison, storage function, and count function. Detected by the flow rate sensor 10, the feed water temperature sensor 11, the bath return temperature sensor 17, the bath temperature sensor 18, the water level sensor 19, the hot water storage temperature sensors 22a to 22e, the incoming water temperature sensor 32, the boiling temperature sensor 33, and the outside air temperature sensor 34 The value to be input is input, and the driving of the hot water mixing valve 7, the bath circulation pump 16, the hot water solenoid valve 21, the compressor 23, the expansion valve 25, the blower fan 27, and the heating circulation pump 31 is controlled, and the boiling operation and hot water supply are controlled. It controls the operation, the bath heating operation, etc., and is connected to the remote controller 35 so as to be communicable. Furthermore, the control means 40 is provided with a hot water supply amount storage means 41 for accumulating and storing the amount of hot water supplied from the hot water storage tank 1.

<給湯動作>
次に、給湯栓12が開かれ、給湯流量センサ10が給湯開始と見なせる量以上の流量を検出すると、制御手段40は給湯温度センサ9で検出する給湯温度がリモートコントローラ35で設定した給湯設定温度となるように給湯混合弁7の開度を調節し、出湯管4からの湯と給水バイパス管6からの水とを混合して給湯設定温度の湯を給湯する。
<Hot-water supply operation>
Next, when the hot-water tap 12 is opened and the hot-water supply flow sensor 10 detects a flow rate that is greater than or equal to the amount that hot water supply can be started, the hot water temperature detected by the hot water temperature sensor 9 is set by the remote controller 35. Then, the opening of the hot water supply mixing valve 7 is adjusted so that hot water from the hot water supply pipe 4 and water from the hot water supply bypass pipe 6 are mixed to supply hot water at a hot water supply set temperature.

このとき、制御手段40は、給水温度センサ11で検出する給水温度と、給湯流量センサ11で検出する給湯流量と、給湯設定温度とから、一定温度(ここでは43℃)に換算された貯湯タンク1からの給湯量を積算記憶する。ここで、給湯量は一日単位で積算して過去所定期間(ここでは7日間)にわたり記憶を行うものとしている。   At this time, the control means 40 is a hot water storage tank converted into a constant temperature (43 ° C. in this case) from the hot water temperature detected by the hot water temperature sensor 11, the hot water flow rate detected by the hot water flow sensor 11, and the hot water set temperature. The hot water supply amount from 1 is accumulated and stored. Here, the hot water supply amount is accumulated in units of one day, and is stored for a past predetermined period (here, 7 days).

そして、給湯栓12が閉じられる等して給湯流量センサ10が検出する流量が給湯停止と見なせる量未満の流量まで低下すると、制御手段40は給湯混合弁7の開度調節を終了し、給湯を終了する。   When the flow rate detected by the hot water supply flow rate sensor 10 decreases to a flow rate less than an amount that can be regarded as a hot water supply stop, for example, when the hot water tap 12 is closed, the control means 40 ends the adjustment of the opening degree of the hot water supply mixing valve 7 and supplies hot water. finish.

<湯張り動作>
また、リモートコントローラ35のふろスイッチ38がオンされた場合について説明すると、制御手段40は湯張り電磁弁21を開き、給湯温度センサ9で検出する給湯温度がリモートコントローラ35で設定したふろ設定温度となるように給湯混合弁7の開度を調節してふろ設定温度の湯を湯張りし、給湯流量センサ10が検出する湯張り電磁弁21を開いてからの流量積算値が予めリモートコントローラ35等で設定した湯張り湯量に達すると湯張り電磁弁21を閉じる。
<Water filling operation>
The case where the bath switch 38 of the remote controller 35 is turned on will be described. The control means 40 opens the hot water solenoid valve 21, and the hot water temperature detected by the hot water temperature sensor 9 is the same as the bath set temperature set by the remote controller 35. The flow rate integrated value after opening the hot water solenoid valve 21 detected by the hot water supply flow rate sensor 10 is adjusted in advance by adjusting the opening of the hot water supply mixing valve 7 so that the hot water of the bath set temperature is filled. When the amount of hot water set in step S3 is reached, the hot water solenoid valve 21 is closed.

このとき、制御手段40は、給水温度センサ11で検出する給水温度と、給湯流量センサ11で検出する給湯流量と、ふろ設定温度とから、一定温度(ここでは43℃)に換算された貯湯タンク1からの浴槽13への給湯量を先の給湯量に加算するようにして積算記憶する。   At this time, the control means 40 is a hot water storage tank converted to a constant temperature (here 43 ° C.) from the hot water temperature detected by the hot water temperature sensor 11, the hot water flow rate detected by the hot water flow sensor 11, and the bath set temperature. The amount of hot water supplied from 1 to the bathtub 13 is accumulated and stored so as to be added to the previous amount of hot water.

<保温動作>
そして、湯張り運転を完了すると制御手段40は所定の保温時間(例えば2時間)の保温運転を行う。この保温運転では、定期的にふろ循環ポンプ16を駆動して浴槽水温度をチェックし、ふろ設定温度未満であればふろ加熱要求ありとしてふろ循環ポンプ16の駆動を継続して浴槽水をふろ設定温度まで加熱するようにしている。そして、ふろ加熱要求ありとされてふろ加熱動作が行われると、制御手段40は、ふろ加熱実績ありの旨を記憶し、そして、湯張り運転の完了から所定の保温時間が経過すると、浴槽水の保温運転を行わないようにしている。
<Insulation operation>
When the hot water filling operation is completed, the control means 40 performs a heat insulation operation for a predetermined heat insulation time (for example, 2 hours). In this heat insulation operation, the bath circulation pump 16 is periodically driven to check the bath water temperature. If the bath temperature is lower than the bath setting temperature, the bath circulation pump 16 is continuously driven as if bath bath heating is requested, and bath water is set. Heat to temperature. When the bath heating operation is performed with the bath heating request being requested, the control means 40 stores that the bath heating has been performed, and when a predetermined warming time has elapsed since the completion of the hot water filling operation, The heat insulation operation is not performed.

<追い焚き動作>
また、リモートコントローラ35の追い焚きスイッチ39がオンされると、制御手段40は、ふろ加熱要求ありとしてふろ設定温度まで加熱する追い焚き運転を行うようにしており、追い焚き運転によってふろ加熱要求が発生すると、制御手段40は、ふろ循環ポンプ16を駆動開始し、浴槽水をふろ熱交換器14に循環させて、貯湯タンク1内の貯湯熱によって浴槽水を加熱するふろ加熱動作を開始すると共にふろ加熱実績ありの旨を記憶し、そして、ふろ戻り温度センサ17がふろ設定温度以上を検出すると、ふろ循環ポンプ16を駆動停止してふろ加熱動作を終了する。
<Casting action>
Further, when the reheating switch 39 of the remote controller 35 is turned on, the control means 40 performs a reheating operation in which the reheating operation is requested and the reheating operation is performed up to the set temperature. When generated, the control means 40 starts driving the bath circulation pump 16, circulates the bath water to the bath heat exchanger 14, and starts a bath heating operation for heating the bath water with the hot water stored in the hot water storage tank 1. The fact that there is a bath heating record is stored, and when the bath return temperature sensor 17 detects the bath set temperature or more, the bath circulating pump 16 is stopped and the bath heating operation is terminated.

<沸き上げ動作>
次に、電力料金単価の安価な特定時間帯である深夜時間帯の沸き上げ動作について、図2のフローチャートに基づいて説明する。ここでは、23時から翌朝7時までの深夜時間帯がそれ以外の昼間時間帯よりも電力料金単価が安価な料金制度に基づいて説明するが、これに限られず、例えば22時から翌朝8時までを安価な深夜時間帯とする料金制度でもよいものである。
<Boiling operation>
Next, the heating operation in the midnight time zone, which is a specific time zone where the power unit price is inexpensive, will be described based on the flowchart of FIG. Here, a description will be given based on a charge system in which the unit price of electricity is cheaper in the midnight time zone from 23:00 to 7:00 the next morning than in other daytime hours, but is not limited to this, for example, from 22:00 to 8:00 the next morning It is also possible to use a fee system with a low-cost late-night time.

現在時刻が23時になり深夜時間帯の開始時刻となると(ステップS1でYes)、制御手段40は、記憶している過去所定期間の給湯量から平均給湯量を算出し(ステップS2)、さらに、一日ごとの給湯量のバラツキ度合を示す値として標準偏差を算出し(ステップS3)、平均給湯量と標準偏差に基づいて一定温度(43℃)換算の必要貯湯量Qを算出、決定する(ステップS4)。   When the current time is 23:00 and the start time of the midnight time zone (Yes in step S1), the control means 40 calculates the average hot water supply amount from the stored hot water supply amount in the past predetermined period (step S2), A standard deviation is calculated as a value indicating the degree of variation in the amount of hot water supply per day (step S3), and a required hot water storage amount Q converted to a constant temperature (43 ° C.) is calculated and determined based on the average hot water supply amount and the standard deviation ( Step S4).

次に、制御手段40は、外気温度センサ34で検出する外気温度Taに応じ、予め記憶されている外気温度Taに応じたテーブルデータから目標沸き上げ温度Tsを決定する(ステップS5)。ここでは、目標沸き上げ温度Tsを外気温度Taが10℃未満で75℃、外気温度Taが10℃以上では70℃とする。   Next, the control means 40 determines the target boiling temperature Ts from the table data corresponding to the stored outside air temperature Ta according to the outside air temperature Ta detected by the outside air temperature sensor 34 (step S5). Here, the target boiling temperature Ts is 75 ° C. when the outside air temperature Ta is less than 10 ° C., and 70 ° C. when the outside air temperature Ta is 10 ° C. or more.

なお、外気温度Taと目標沸き上げ温度Tsの関係テーブルデータの代わりに、給水温度Twと目標沸き上げ温度Tsのテーブルデータを制御手段40に予め記憶し、ステップS3では、給水温度センサ11、最下部の貯湯温度センサ22eあるいは入水温度センサ32で検出される給水温度Twに基づいて目標沸き上げ温度Tsを決定する構成としてもよい。   Instead of the relationship table data of the outside air temperature Ta and the target boiling temperature Ts, table data of the feed water temperature Tw and the target boiling temperature Ts is stored in advance in the control means 40. In step S3, the feed water temperature sensor 11, The target boiling temperature Ts may be determined based on the feed water temperature Tw detected by the lower hot water storage temperature sensor 22e or the incoming water temperature sensor 32.

そして、制御手段40は、必要貯湯量Qを熱量に再換算した値を目標沸き上げ温度Tsから給水温度Twを引いた値で除して、目標沸き上げ量Vを算出する(ステップS6)。このとき、目標沸き上げ量Vは、貯湯温度センサ22a〜eの位置との関係に応じて補正され、算出された値が、100L以下では100L、100L超140L以下では140L、140L超180L未満では180Lを目標沸き上げ量Vとなるように補正して決定していると共に、決定された目標沸き上げ量Vに対応する貯湯温度センサ22c〜eのいずれか一つを沸き上げ完了を判定する貯湯温度センサとする。   Then, the control means 40 calculates the target boiling amount V by dividing the value obtained by reconverting the necessary hot water storage amount Q into the heat amount by the value obtained by subtracting the feed water temperature Tw from the target boiling temperature Ts (step S6). At this time, the target boiling amount V is corrected according to the relationship with the position of the hot water storage temperature sensors 22a to 22e, and the calculated value is 100L for 100L or less, 140L for less than 100L, 140L for less than 140L, and less than 180L for more than 140L. Hot water storage is determined by correcting 180L to be the target boiling amount V, and determining whether boiling of any one of the hot water storage temperature sensors 22c to 22e corresponding to the determined target boiling amount V has been completed. A temperature sensor is used.

次に、制御手段40は、貯湯温度センサ22a〜eの検出温度に基づき、残湯判定温度(例えば50℃)以上の残湯量Vzを算出し(ステップS7)、目標沸き上げ量Vから残湯量Vzを減じて沸き上げ必要量Vpを算出する(ステップS8)。   Next, the control means 40 calculates the remaining hot water amount Vz equal to or higher than the remaining hot water determination temperature (for example, 50 ° C.) based on the detected temperatures of the hot water storage temperature sensors 22a to 22e (step S7), and the remaining hot water amount from the target boiling amount V. Vz is subtracted to calculate the required boiling amount Vp (step S8).

そして、制御手段40は、沸き上げ必要量Vpをヒートポンプ式加熱器29の一定の加熱能力(ここでは4.5kW)で除して沸き上げ時間を算出し、深夜時間帯の終了時刻から逆算して沸き上げ開始時刻(ピークシフト時刻)を算出する(ステップS9)。   Then, the control means 40 calculates the boiling time by dividing the boiling required amount Vp by the constant heating capacity of the heat pump heater 29 (here, 4.5 kW), and calculates backward from the end time of the midnight time zone. The boiling start time (peak shift time) is calculated (step S9).

現在時刻がピークシフト時刻となると(ステップS10でYes)、前記ステップS5で決定した目標沸き上げ温度Tsでの沸き上げ動作を開始すべく、ヒートポンプ式加熱器29および加熱循環ポンプ31を駆動開始し、貯湯タンク1下部から取り出した水を目標沸き上げ温度Tsの湯に加熱して貯湯タンク1上部から戻して積層状に貯湯する(ステップS11)。   When the current time becomes the peak shift time (Yes in step S10), the heat pump heater 29 and the heating circulation pump 31 are started to start the boiling operation at the target boiling temperature Ts determined in step S5. Then, the water taken out from the lower part of the hot water storage tank 1 is heated to hot water having the target boiling temperature Ts, returned from the upper part of the hot water storage tank 1 and stored in a stacked form (step S11).

前記ステップS6で決定した目標沸き上げ量Vに対応する貯湯温度センサ22c〜eが規定の沸き上げ完了温度(例えば65℃)を検出するか、または入水温度センサ32が加熱上限温度(例えば55℃)以上を検出するかして沸き上げが完了されるか(ステップS12)、現在時刻が深夜時間帯の終了時刻である7時に到達すると(ステップS13)、ヒートポンプ式加熱器29および加熱循環ポンプ31を駆動停止して沸き上げ動作を終了し(ステップS14)、沸き上げ動作のフローを終了するようにしている(ステップS15)。   The hot water storage temperature sensors 22c to 22e corresponding to the target boiling amount V determined in step S6 detect a specified boiling completion temperature (for example, 65 ° C.), or the incoming water temperature sensor 32 has a heating upper limit temperature (for example, 55 ° C.). ) Whether boiling is completed by detecting the above (step S12), or when the current time reaches 7:00, which is the end time of the midnight time zone (step S13), the heat pump heater 29 and the heating circulation pump 31 Is stopped and the boiling operation is terminated (step S14), and the flow of the boiling operation is terminated (step S15).

<沸き増し動作>
次に、電力料金単価が深夜時間帯に比べて高価な特定時間帯外である昼間時間帯に、湯切れを防止するために貯湯タンク1内の湯水を沸き増す沸き増し動作について図3に示すフローチャートに基づいて説明する。
<Boiling operation>
Next, FIG. 3 shows a reheating operation in which hot water in the hot water storage tank 1 is boiled in order to prevent hot water outage during daytime hours when the unit price of the electric power price is outside the specific time zone, which is more expensive than the midnight time zone. This will be described based on a flowchart.

深夜時間帯が終了して昼間時間帯が開始されると(ステップS21)、制御手段40は、貯湯温度センサ22a〜eの検出温度とそれぞれの貯湯温度センサ22a〜eに割り当てられた貯湯容積とから深夜時間帯の沸き上げ動作で沸き上げた結果となる沸き上げ貯湯熱量Qeを算出する(ステップS22)。   When the midnight time zone ends and the daytime time zone starts (step S21), the control means 40 determines the detected temperature of the hot water storage temperature sensors 22a to 22e and the hot water storage volume assigned to each of the hot water storage temperature sensors 22a to 22e. To boiled hot water storage heat amount Qe, which is the result of boiling in the midnight boiling operation (step S22).

次に、制御手段40は、図2のステップS4で求めた必要貯湯量Qを熱量に再換算した値から沸き上げ貯湯熱量Qeを減算して、必要貯湯量Qのうち深夜時間帯で沸き上げ切れずに昼間時間帯で沸き増す必要のある熱量(沸き増し必要熱量Qm)を算出し(ステップS23)、沸き増し必要熱量Qmをヒートポンプ式加熱器29の一定の加熱能力Wで除して熱量を沸き増し時間に換算して沸き増し必要時間tmを算出する(ステップS24)。   Next, the control means 40 subtracts the boiling hot water storage heat amount Qe from the value obtained by reconverting the necessary hot water storage amount Q obtained in step S4 of FIG. The amount of heat that needs to be boiled in the daytime time without being cut off (calculated heat amount Qm) is calculated (step S23), and the amount of heat Qm that needs to be boiled up is divided by the constant heating capacity W of the heat pump heater 29. Is converted into a boiling time, and the required boiling time tm is calculated (step S24).

そして、ステップS25では、制御手段40は、昼間時間帯開始からの沸き増し運転の積算時間が沸き増し必要時間tm未満かどうかを判別し、ステップS25でYesとなるとステップS26へ進み、図2のステップS2で算出した平均給湯量が貯湯タンク1の満タン容量(ここでは43℃換算で250Lを満タン容量とする)から多少(貯湯タンク1容量の半分程度まで)上回る程度の所定量(ここでは350L)未満で、かつステップS3で算出したバラツキ度合としての標準偏差が所定値以上であるか、または、平均給湯量が貯湯タンク1の満タン以下の所定量(ここでは250L)未満であるかどうかを判別する。   Then, in step S25, the control means 40 determines whether or not the accumulated operation time from the start of the daytime period has increased and is less than the required time tm, and if the answer is Yes in step S25, the process proceeds to step S26, and FIG. The predetermined amount (here, the average hot water supply amount calculated in step S2 is slightly higher than the full tank capacity of the hot water storage tank 1 (here, 250 L converted to 43 ° C.) And the standard deviation as the degree of variation calculated in step S3 is greater than or equal to a predetermined value, or the average hot water supply amount is less than a predetermined amount (250 L in this case) less than the full tank of the hot water storage tank 1. Determine whether or not.

ステップS26でYesと判断された場合は、ステップS27へ進み、給湯動作やふろ加熱動作に伴って貯湯温度センサ22a〜eで検出する貯湯量が予め定められた第2沸き増し開始貯湯量(例えば43℃換算で100L)以下まで低下したかどうかを判別する。   If it is determined Yes in step S26, the process proceeds to step S27, where the amount of hot water to be detected by the hot water storage temperature sensors 22a to 22e in accordance with the hot water supply operation and the bath heating operation is determined in advance. It is determined whether or not the pressure has decreased to 100 L) or less in terms of 43 ° C.

一方、ステップS26でNoと判断された場合は、ステップS28へ進み、給湯動作やふろ加熱動作に伴って貯湯温度センサ22a〜eで検出する貯湯量が予め定められた第1沸き増し開始貯湯量(例えば43℃換算で200L)以下まで低下したかどうかを判別する。   On the other hand, when it is determined No in step S26, the process proceeds to step S28, and the first hot water start amount of hot water stored in advance is determined by the hot water storage amount detected by the hot water storage temperature sensors 22a to 22e in accordance with the hot water supply operation and the bath heating operation. It is discriminated whether or not it is reduced to (for example, 200 L in terms of 43 ° C.) or less.

貯湯量が沸き増し開始貯湯量以下となると(ステップS27またはステップS28でYes)、制御手段40は、ヒートポンプ式加熱器29と加熱循環ポンプ31を駆動して、貯湯タンク1下部から取り出した水を目標沸き上げ温度Tsの湯に加熱して貯湯タンク1上部から戻して積層状に貯湯する沸き増し運転を開始する(ステップS29)。また、このとき、制御手段40は、昼間時間帯開始からの沸き増し運転時間を積算して記憶するようにしている。   When the hot water storage amount increases and becomes less than the starting hot water storage amount (Yes in step S27 or step S28), the control means 40 drives the heat pump heater 29 and the heating circulation pump 31 to remove the water taken out from the lower part of the hot water storage tank 1. Heating to hot water at the target boiling temperature Ts, returning from the upper part of the hot water storage tank 1 and starting hot water storage operation to start laminating hot water (step S29). At this time, the control means 40 accumulates and stores the boiling operation time from the start of the daytime period.

そして、沸き増し運転に伴って貯湯温度センサ22a〜eで検出する貯湯量が予め定められた沸き増し停止貯湯量(例えば43℃換算で50L)以上増加したか(ステップS30)、沸き増し積算時間が沸き増し必要時間tmに達したか(ステップS31)を判別し、それぞれYesとなった時点でヒートポンプ式加熱器29と加熱循環ポンプ31の駆動を停止して沸き増し運転を停止する(ステップS32)。   Then, whether or not the hot water storage amount detected by the hot water storage temperature sensors 22a to 22e has increased by a predetermined additional hot water stoppage hot water storage amount (for example, 50L in terms of 43 ° C.) or not (step S30). It is determined whether or not the required time tm has been reached (step S31), and at the time when each becomes Yes, the driving of the heat pump heater 29 and the heating circulation pump 31 is stopped to stop the boiling operation (step S32). ).

沸き増し運転を停止した後は、ステップS25へ戻り、沸き増し積算時間が沸き増し必要時間tm以上となると(ステップS25でNo)、沸き増し動作のフローを終了し(ステップS33)、当日は沸き増し運転を行わないようにしている。このように、沸き増しが必要な熱量を沸き増しが必要な時間に換算することで、沸き増しが必要な熱量を過不足なく沸き増しすることができ、簡易に沸き増し量をコントロールすることができるものである。   After stopping the reheating operation, the process returns to step S25. When the reheating increase time reaches the required time tm (No in step S25), the flow of the reheating operation is terminated (step S33), and boiling is performed on that day. Do not perform additional driving. In this way, by converting the amount of heat that requires boiling to the time required for boiling, the amount of heat that requires boiling can be increased without excess and deficiency, and the amount of boiling can be easily controlled. It can be done.

このようにして、平均給湯量が貯湯タンク1の満タン容量より多少(貯湯タンク1の半分程度まで)多い所定量未満かつ満タン容量以上で、日々の給湯量のバラツキが大きい使い方をされている場合、沸き増しが不要な程度しか給湯されない日(図4(b)の6日目など)があるが、平均給湯量とバラツキ度合としての標準偏差の値に基づいて所定の沸き増し開始貯湯量を少ない値(第2沸き増し開始貯湯量)とするため、不要な沸き増しを極力行わずに湯余りを防止できる。   In this way, the average hot water supply amount is slightly less than the full tank capacity of the hot water storage tank 1 (up to about half of the hot water storage tank 1), less than the predetermined amount and over the full tank capacity, and the daily hot water supply has a large variation. If there is a day when hot water is supplied only to the extent that it is not necessary to reheat (such as the sixth day of FIG. 4 (b)), the predetermined hot water starting storage water is stored based on the average amount of hot water and the standard deviation as the degree of variation. Since the amount is set to a small value (second boiling start hot water storage amount), excess hot water can be prevented without performing unnecessary boiling increase as much as possible.

特に、湯張り動作を頻繁(週に2〜3回程度)に行わないような使い方をされた場合に、湯張り動作を行わなかった日に不要な沸き増しが行われないこととなり、湯余りを防止することができるものである。一方、湯張り動作を行った日には、貯湯量が第2沸き増し開始貯湯量を下回れば沸き増しが行われるため、湯切れを防止することができる。   In particular, if the hot water filling operation is not performed frequently (about 2 to 3 times a week), unnecessary boiling will not be performed on the day when the hot water filling operation is not performed. Can be prevented. On the other hand, on the day when the hot water filling operation is performed, if the hot water storage amount is increased by the second boiling point and falls below the start hot water storage amount, the hot water is increased, so that hot water shortage can be prevented.

また、同じように平均給湯量が貯湯タンク1の満タン容量より多少(貯湯タンク1の半分程度まで)多い所定量未満かつ満タン容量以上で、バラツキ度合としての標準偏差が非常に大きな値であった場合、図4の(c)に示すように、突出した給湯量の日が存在する使い方をされているが、この場合も、平均給湯量とバラツキ度合としての標準偏差の値に基づいて所定の沸き増し開始貯湯量を少ない値(第2沸き増し開始貯湯量)とするため、不要な沸き増しを極力行わずに湯余りを防止できる。   Similarly, the average amount of hot water supply is slightly larger than the full tank capacity of the hot water tank 1 (up to about half of the hot water tank 1), less than a predetermined amount and above the full tank capacity, and the standard deviation as the degree of variation is very large. In such a case, as shown in FIG. 4 (c), there is a usage in which a day of protruding hot water supply exists, but in this case as well, based on the value of the standard deviation as the average hot water supply amount and the degree of variation Since the predetermined amount of boiling start hot water storage is set to a small value (second boiling start hot water storage amount), excess hot water can be prevented without performing unnecessary boiling as much as possible.

また、平均給湯量が貯湯タンク1の満タン容量より多少(貯湯タンク1の半分程度まで)多い所定量未満かつ満タン容量以上で、バラツキ度合が所定値以下の場合は、図4の(a)に示すように日々安定して平均給湯量程度の給湯を行っているため、沸き増し開始貯湯量を多い値(第1沸き増し開始貯湯量)として、平均給湯量を早めに沸き上げて湯切れの発生を確実に防止することができる。   When the average hot water supply amount is less than a predetermined amount slightly larger than the full tank capacity of the hot water storage tank 1 (up to about half of the hot water storage tank 1) and more than the full tank capacity, and the variation degree is less than the predetermined value, ) As shown in (2), the water supply is stable and the average amount of hot water is being supplied every day, so the amount of hot water at the beginning of boiling is increased (the first amount of hot water at the beginning of boiling), and the average amount of hot water is boiled up early. Occurrence of cuts can be reliably prevented.

さらに、平均給湯量が所定量以上の場合は、バラツキ度合に関係なく沸き増し開始貯湯量を多い値(第1沸き増し開始貯湯量)としているので、貯湯量が減ると素早く沸き増しが開始されて湯切れの発生を防止することができる。   In addition, when the average hot water supply amount is greater than or equal to the predetermined amount, the boiling increase start hot water storage amount is set to a large value (the first boiling start hot water storage amount) regardless of the degree of variation. The occurrence of hot water can be prevented.

一方、平均給湯量が貯湯タンク1の満タン容量とみなす所定量(ここでは250L)未満である場合は、所定の沸き増し開始貯湯量を少ない値(第2沸き増し開始貯湯量)とするため、不要な沸き増しを極力行わずに湯余りを防止できる。   On the other hand, when the average hot water supply amount is less than a predetermined amount (250 L in this case) that is regarded as the full tank capacity of the hot water storage tank 1, the predetermined hot water start hot water storage amount is set to a small value (second hot water start hot water storage amount). Therefore, it is possible to prevent excess hot water without excessive heating as much as possible.

なお、この実施形態では、バラツキ度合として給湯量の標準偏差を用いたが、これに限らず、分散を用いてもよい。   In this embodiment, the standard deviation of the hot water supply amount is used as the degree of variation, but the present invention is not limited to this, and dispersion may be used.

また、この実施形態では、貯湯タンク1の満タン容量から多少上回る程度の所定量として43℃換算350Lの固定値を用いたが、沸き上げ動作開始時に決定される目標沸き上げ温度Tsで貯湯タンク1の容積全部を沸き上げた場合の熱量を43℃換算した値を満タン容量として設定し、この満タン容量に所定の量(例えば100L)を加算した値を、貯湯タンク1の満タン容量から多少上回る程度の所定量としてもよく、また、貯湯タンク1の満タン容量として43℃換算250Lの固定値を用いたが、沸き上げ動作開始時に決定される目標沸き上げ温度Tsで貯湯タンク1の容積全部を沸き上げた場合の熱量を43℃換算した値を満タン容量として設定し、平均給湯量がこの満タン容量以下の場合に、バラツキ度合に関係なく、所定の沸き増し開始貯湯量を少ない値とするようにしてもよい。   In this embodiment, a fixed value of 350 L in terms of 43 ° C. is used as a predetermined amount that is slightly higher than the full tank capacity of the hot water storage tank 1, but the hot water storage tank is at the target boiling temperature Ts determined at the start of the boiling operation. A value obtained by converting the amount of heat when boiling the entire volume of 1 into 43 ° C. is set as a full tank capacity, and a value obtained by adding a predetermined amount (for example, 100 L) to the full tank capacity is used as the full tank capacity of the hot water storage tank 1. The fixed amount may be slightly higher than the predetermined amount, and a fixed value of 250 L in terms of 43 ° C. is used as the full tank capacity of the hot water storage tank 1, but the hot water storage tank 1 at the target boiling temperature Ts determined at the start of the boiling operation. A value obtained by converting the amount of heat when the entire volume of the water is boiled up to 43 ° C is set as the full tank capacity. When the average hot water supply amount is less than this full tank capacity, the predetermined boiling point is obtained regardless of the degree of variation. It may be less value to start hot water storage amount increases.

このように、目標沸き上げ温度Tsに応じた満タン容量を設定して、この満タン容量と満タン容量に応じた所定量に応じて前記ステップS26の判断を行うことで、平均給湯量とバラツキ度合によって昼間時間帯の沸き増し動作が行われたり行われなかったりする状態にあることを確実に判別し、不要な沸き増し動作を極力回避して湯余りの発生を抑制することができる。   Thus, by setting the full tank capacity in accordance with the target boiling temperature Ts and making the determination in step S26 according to the full tank capacity and a predetermined amount in accordance with the full tank capacity, the average hot water supply amount and Depending on the degree of variation, it is possible to reliably determine that the heating operation during the daytime period is performed or not, and avoid unnecessary heating as much as possible to suppress the occurrence of excess water.

また、この実施形態では、貯湯温度センサ22a〜eで検出する貯湯温度に基づき43℃換算の貯湯量が第1沸き増し開始貯湯量および第2沸き増し開始貯湯量未満になったかどうかを判別するようにしているが、これに限らず、貯湯温度センサ22a〜eのうち予め定めた一つの第1貯湯温度センサ(例えば貯湯温度センサ22d)で検出する貯湯温度が第1所定温度(例えば55℃)未満となると第1沸き増し開始貯湯量未満となったと判別し、第1貯湯温度センサよりも上方に位置する予め定めた一つの第2貯湯温度センサ(ここでは貯湯温度センサ22c)で検出する貯湯温度が第2所定温度(例えば55℃)未満となると第2沸き増し開始貯湯量未満となったと判別するようにしてもよい。ここで、第1所定温度と第2所定温度の関係は、同一の温度、あるいはどちらか一方が高くなるようにしてもよく、第2沸き増し開始貯湯量が第1沸き増し開始貯湯量未満となるように定めればよいものである。このように、貯湯温度センサ22a〜eのうち予め定めた貯湯温度センサで検出する貯湯温度で貯湯量が第1沸き増し開始貯湯量または第2沸き増し開始貯湯量未満となったことを検出することで、沸き増し開始の必要性を簡易に判別することができる。   Further, in this embodiment, it is determined whether or not the hot water storage amount converted to 43 ° C. is less than the first boiling start hot water storage amount and the second hot water starting start hot water storage amount based on the hot water storage temperature detected by the hot water storage temperature sensors 22a to 22e. However, the present invention is not limited to this, and the hot water storage temperature detected by one predetermined hot water storage temperature sensor (for example, hot water storage temperature sensor 22d) among the hot water storage temperature sensors 22a to 22e is a first predetermined temperature (for example, 55 ° C). ) Is less than the first boiling start hot water storage amount, it is detected by a predetermined second hot water storage temperature sensor (here, hot water storage temperature sensor 22c) located above the first hot water storage temperature sensor. When the hot water storage temperature becomes lower than a second predetermined temperature (for example, 55 ° C.), it may be determined that the second boiling point has increased and the hot water storage amount has become lower than the starting hot water storage amount. Here, the relationship between the first predetermined temperature and the second predetermined temperature may be the same temperature, or either one may be increased, and the second boiling start hot water storage amount is less than the first boiling start hot water storage amount. It suffices to determine as follows. As described above, the hot water storage temperature detected by the predetermined hot water storage temperature sensor among the hot water storage temperature sensors 22a to 22e detects that the hot water storage amount is less than the first boiling start hot water storage amount or the second boiling increase hot water storage amount. Thus, it is possible to easily determine the necessity of starting boiling.

また、この実施形態では、ステップS24にて沸き増し必要熱量Qmを沸き増し必要時間tmに換算して、沸き増しを時間でコントロールしているが、ヒートポンプ式加熱器29は一定の加熱能力Wに制御されることから熱量を時間に換算しても実質的に同一で、昼間時間帯に実際に沸き増した沸き増し積算熱量を管理することで、過不足なく沸き増しすることも可能である。   In this embodiment, in step S24, the additional heat quantity Qm is heated and converted into the required time tm, and the additional heating is controlled by time. However, the heat pump heater 29 has a constant heating capacity W. Since it is controlled, it is substantially the same even if the amount of heat is converted into time, and it is possible to increase the amount of heat without excess or deficiency by managing the increased accumulated heat amount actually increased during the daytime.

また、この実施形態では、ステップS30にて、沸き増し運転に伴って貯湯量が予め定められた沸き増し停止貯湯量(例えば43℃換算で50L)以上増加したことを貯湯温度センサ22a〜eで検出すると沸き増し停止するようにしているが、これに限らず、平均給湯量あるいは必要貯湯量Qが多い場合は、沸き増し停止貯湯量を多くするようにしてもよい。   In this embodiment, the hot water storage temperature sensors 22a to 22e indicate that in step S30, the hot water storage amount has increased by a predetermined increase in hot water stoppage storage amount (for example, 50L in terms of 43 ° C.) or more with the increase operation. If detected, the increase in boiling is stopped. However, the present invention is not limited to this, and when the average hot water supply amount or the required hot water storage amount Q is large, the increase in boiling stop hot water storage amount may be increased.

1 貯湯タンク
2 給水管
4 出湯管
22 貯湯温度センサ(貯湯量検出手段)
29 ヒートポンプ式加熱器(加熱手段)
30 加熱循環回路(加熱手段)
31 加熱循環ポンプ(加熱手段)
40 制御手段
41 給湯量記憶手段
DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Water supply pipe 4 Hot water discharge pipe 22 Hot water storage temperature sensor (hot water storage amount detection means)
29 Heat pump heater (heating means)
30 Heating circulation circuit (heating means)
31 Heating circulation pump (heating means)
40 Control means 41 Hot water storage amount storage means

Claims (4)

湯水を貯湯する貯湯タンクと、この貯湯タンクに給水する給水管と、前記貯湯タンクから出湯する出湯管と、前記貯湯タンクの湯水を加熱する加熱手段と、過去所定期間の一日ごとの給湯量を記憶する給湯量記憶手段と、前記貯湯タンク内の貯湯量を検出する貯湯量検出手段と、特定時間帯に前記貯湯タンク内の湯水を沸き上げるよう前記加熱手段を制御する制御手段とを備えたものにおいて、前記制御手段は、前記給湯量記憶手段の記憶内容に基づき過去の所定期間における平均給湯量と給湯量のバラツキ度合を算出し、前記平均給湯量が前記貯湯タンクの満タン容量より多い所定量以上、または前記平均給湯量が前記所定量未満かつ前記バラツキ度合が所定値未満の場合には、特定時間帯外に前記貯湯量検出手段が所定の第1沸き増し開始貯湯量未満を検出すると前記貯湯タンク内の湯水を沸き増すよう前記加熱手段を制御し、前記平均給湯量が前記所定量未満かつ前記バラツキ度合が前記所定値以上の場合には、特定時間帯外に前記貯湯量検出手段が前記第1沸き増し開始貯湯量よりも少ない所定の第2沸き増し開始貯湯量未満を検出すると前記貯湯タンク内の湯水を沸き増すよう前記加熱手段を制御するようにしたことを特徴とする貯湯式給湯装置。   A hot water storage tank for storing hot water, a water supply pipe for supplying water to the hot water storage tank, a hot water discharge pipe for discharging hot water from the hot water storage tank, a heating means for heating the hot water in the hot water storage tank, and a daily hot water supply amount for a predetermined period in the past Hot water storage means for storing hot water, hot water storage detection means for detecting the amount of hot water stored in the hot water storage tank, and control means for controlling the heating means so as to boil hot water in the hot water storage tank during a specific time period. In addition, the control means calculates the degree of variation between the average hot water supply amount and the hot water supply amount in the past predetermined period based on the stored contents of the hot water supply amount storage means, and the average hot water supply amount is calculated from the full capacity of the hot water storage tank. If the amount of hot water is greater than a predetermined amount, or if the average amount of hot water supply is less than the predetermined amount and the variation degree is less than a predetermined value, the hot water storage amount detection means is opened at a predetermined first boiling point outside a specific time period. When detecting less than the hot water storage amount, the heating means is controlled so as to boil hot water in the hot water storage tank. When the average hot water supply amount is less than the predetermined amount and the variation degree is not less than the predetermined value, it is out of a specific time zone. In addition, when the hot water storage amount detecting means detects less than a predetermined second boiling start hot water storage amount that is smaller than the first boiling start hot water storage amount, the heating means is controlled to increase the hot water in the hot water storage tank. A hot water storage type hot water supply device characterized by that. 前記貯湯量検出手段は、前記貯湯タンクの側面上下に複数設けられた貯湯温度センサを備え、前記複数の貯湯温度センサのうち予め定められた第1貯湯温度センサが第1所定温度未満を検出すると前記第1沸き増し開始貯湯量未満であると判別し、前記複数の貯湯温度センサのうち前記第1貯湯温度センサよりも高い位置にある予め定められた第2貯湯温度センサが第2所定温度未満を検出すると前記第2沸き増し開始貯湯量未満であると判別するようにしたことを特徴とする請求項1記載の貯湯式給湯装置。   The hot water storage amount detection means includes a plurality of hot water storage temperature sensors provided above and below the side surface of the hot water storage tank, and a predetermined first hot water storage temperature sensor among the plurality of hot water storage temperature sensors detects a temperature lower than a first predetermined temperature. It is determined that the amount of hot water is less than the first boiling start hot water storage amount, and a predetermined second hot water storage temperature sensor that is higher than the first hot water storage temperature sensor among the plurality of hot water storage temperature sensors is less than a second predetermined temperature. The hot water storage type hot water supply apparatus according to claim 1, wherein when it is detected, it is determined that the amount is less than the second boiling start hot water storage amount. 前記制御手段は、前記平均給湯量が前記貯湯タンクの満タン容量以下の場合は、前記バラツキ度合に関係なく特定時間帯外に前記貯湯量検出手段が前記第2沸き増し開始貯湯量未満を検出すると沸き増すよう前記加熱手段を制御するようにしたことを特徴とする請求項1または2記載の貯湯式給湯装置。   When the average hot water supply amount is less than or equal to the full tank capacity of the hot water storage tank, the control means detects the hot water storage amount detection means less than the second boiling start hot water storage amount outside a specific time period regardless of the degree of variation. 3. The hot water storage type hot water supply apparatus according to claim 1, wherein the heating means is controlled to increase boiling. 前記加熱手段は、前記貯湯タンク下部から取り出した湯水を前記貯湯タンク上部に戻す加熱循環回路と、この加熱循環回路途中に設けられたヒートポンプ式加熱器と、前記加熱循環回路途中に設けられた加熱循環ポンプによって構成されていることを特徴とする請求項1〜3のいずれか一項に記載の貯湯式給湯装置。   The heating means includes a heating circulation circuit for returning hot water taken out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, a heat pump heater provided in the middle of the heating circulation circuit, and heating provided in the middle of the heating circulation circuit. It is comprised with the circulation pump, The hot water storage type hot-water supply apparatus as described in any one of Claims 1-3 characterized by the above-mentioned.
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