JP3728122B2 - Absorption air conditioner control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an absorption liquid passage for heating that forms an absorption cycle using an aqueous solution of lithium bromide or the like as an absorption liquid and supplies the absorption liquid from the regenerator to the evaporator. The present invention relates to a control device for an absorption air conditioner that switches between heating operation and cooling operation by opening and closing a valve in the inside, and in particular, cold / hot water pipes provided between an air conditioner body serving as a heat source machine and an indoor unit and a floor heating panel ( The present invention relates to a technique for preventing freezing of cold / hot water in a cold / hot water circulation circuit).
[0002]
[Prior art]
In an absorption type air conditioner using an absorption cycle, during cooling operation, the refrigerant vapor is separated from the low-concentration absorption liquid boiled by heating of the burner in the regenerator during the cooling operation, and the refrigerant vapor is cooled by the condenser and is cooled to the refrigerant liquid. And supplied to the evaporator. The absorbing liquid having a high concentration as the refrigerant vapor is separated in the regenerator is supplied to the absorber. The absorber and the evaporator communicate with each other, and the refrigerant liquid evaporates in the evaporator and takes heat to form a cooling source, and cools the cold / hot water circulating in the cold / hot water piping arranged in the evaporator. The indoor unit is cooled by circulating it through the heat exchanger for air conditioning of the indoor unit.
The absorption liquid absorbs the refrigerant vapor (vaporized by the evaporator) with the absorber, and in order to discharge the heat generated at this time to the outside, a heat exchange pipe is provided in the absorber, and the cooling water pump Heat is discharged to the outside by passage of the cooling water supplied by.
[0003]
During heating operation, the cooling / heating switching valve in the absorption liquid flow path connecting the regenerator and the evaporator is opened separately from the absorption cycle configured as described above, and the absorption liquid heated by the burner is supplied into the evaporator. Thus, the cold / hot water passing through the cold / hot water pipe in the evaporator is heated and circulated to the indoor unit and the floor heating panel.
[0004]
In the above configuration, a cold / hot water circulation circuit for circulating cold / hot water cooled or heated by the air conditioner body is formed between the air conditioner body serving as a heat source unit and the indoor unit and the floor heating panel. In operation, cold / hot water cooled or heated in the evaporator is supplied to an indoor unit or the like to cool or heat the room.
[0005]
Here, since the air conditioner main body forms an absorption cycle, it is more efficient to have a certain degree of capacity. Therefore, for a single air conditioner main body, a plurality of indoor units, floor heating panels, etc. It is commercialized as a multi air conditioner that can be equipped with a terminal.
[0006]
As described above, in the absorption type air conditioner that uses the absorption cycle to switch between the cooling operation and the heating operation, a cold / hot water pipe is provided between the air conditioner body as a heat source device and the terminal of the indoor unit or the like. In order to prevent a decrease in thermal efficiency, a normal heat insulation process is performed on the outside of the cold / hot water pipe.
In the absorption-type air conditioner configured in this way, in order to prevent freezing in the cold / hot water pipe between the air conditioner main body and the terminal such as the indoor unit during the operation stop in the cold / cold season or the like, The cold / hot water has been made to flow in the cold / hot water pipe by driving the cold / hot water pump.
[0007]
[Problems to be solved by the invention]
As described above, the absorption air conditioner is configured so that a plurality of terminals such as an indoor unit and a floor heating panel can be connected, but the operation is not always performed on all terminals.
Therefore, even if the heating operation is performed only in some terminals in the cold / cold season, the cold / hot water in the cold / hot water circulation circuit remains in the terminals that are not performing the heating operation. The heated cold / warm water does not circulate in the cold / warm water circulation circuit connecting the terminals that are stopped. For this reason, in the cold / hot water circulation circuit which leads to the terminal which has stopped operation, there is a risk of freezing.
[0008]
The present invention relates to an absorption type air conditioner that circulates cold / hot water in a cold / hot water pipe between a heat source unit and an indoor unit, and prevents freezing of the cold / hot water in a cold / hot water circulation circuit that leads to a terminal that is stopped. Objective.
[0009]
[Means for Solving the Problems]
In Claim 1 of this invention, the regenerator which heats the absorption liquid containing a refrigerant | coolant by a heating means and isolate | separates a refrigerant | coolant vapor | steam from an absorption liquid, The condenser which cools and condenses the said refrigerant | coolant vapor | steam isolate | separated by this regenerator, An evaporator that evaporates the refrigerant liquid generated in the condenser under a low pressure; an absorber that absorbs the refrigerant vapor evaporated in the evaporator into an absorption liquid from which the refrigerant vapor is separated in the regenerator; An absorption cycle is formed from the absorption liquid pump for returning the absorption liquid from the absorber to the regenerator, and the regenerator and the evaporator are connected by a heating absorption liquid flow path provided with a cooling / heating switching valve. When the cooling / heating switching valve is closed, the evaporator is used as a cooling source by the operation of the absorption cycle, and when the cooling / heating switching valve is opened, the absorbing liquid heated by the regenerator is supplied to the evaporator. Heating Parallel connection and the absorption type heat source machine, any air-conditioning heat exchanger and a floor heating panel of number of opening and closing valves provided respectively for blocking the cold and hot water, to the evaporator heat exchange pipe arranged in to A chilled / hot water circulation circuit for circulating the chilled / warm water heated or cooled in the heat exchange pipe to the air conditioning heat exchanger and the floor heating panel by a chill / warm water pump, and the cooling / warming switching valve during cooling operation are closed. In the control device of the absorption type air conditioner comprising the operation control means for controlling the switching between the cooling operation and the heating operation and the operation start / stop by controlling the valve and opening and closing the cooling / heating switching valve at the time of the heating operation, An outside air temperature detecting means for detecting an outside air temperature when heating operation is performed by the operation control means, and an outside air temperature detected by the outside air temperature detecting means is equal to or lower than a predetermined temperature. Comprising a cold water antifreeze means for opening controlling the on-off valve provided in the heating operation and have not air-conditioning heat exchanger or floor heating panel, cold hot antifreeze means, the heat exchanger for the air conditioner Or when the cold / hot water temperature detected by the cold / hot water temperature detection means respectively provided in the floor heating panel reaches the valve closing temperature or higher, the air conditioning heat exchanger or floor heating panel that has reached the valve closing temperature or higher The open / close valve is closed, and after an elapse of a predetermined time measured by a timer provided for measuring a predetermined time after the valve is closed, an outside air temperature detected by the outside air temperature detecting means is determined. To do.
[0010]
Controller of the absorption-type air conditioner according to claim 2, in addition to the configuration of claim 1, wherein the predetermined time when the outside air temperature detected by said outside air temperature detecting means is timed by low as the timer is set shorter Rukoto It is characterized by.
[0012]
[Operation and effect of the invention]
(About claim 1)
When the heating control is performed by the operation control means, the absorbing liquid heated by the regenerator by the heating means is supplied to the evaporator, and the cold / hot water circulating in the heat exchange pipe disposed in the evaporator is heated. Is done.
The heated cold / hot water is supplied to the air conditioner heat exchanger or the floor heating panel during the heating operation, and the room is heated.
During the heating operation, when the outside air temperature detected by the outside air temperature detecting means falls below a predetermined temperature, the air conditioning heat exchanger that is not performing the heating operation and the opening / closing valve provided in the floor heating panel are opened. .
As a result, when the outside air temperature is low, heated and cooled water is supplied and circulated to the air conditioning heat exchanger and the floor heating panel that are not heated. Cold / hot water between the heat exchanger and the floor heating panel and the heat exchange pipe in the evaporator does not freeze.
The air conditioner heat exchanger or floor heating panel is provided with cold / hot water temperature detection means, respectively. When the detected cold / warm water temperature rises above the valve closing temperature, the heat exchange for air conditioning that detects the temperature is detected. The on-off valve provided in the heater or floor heating panel is closed.
Thereby, the heat of the heated cold / hot water is not continuously released into the room where the heating operation is not required, and waste of energy can be prevented.
After the opening / closing valve is closed, when a predetermined time measured by the timer has elapsed, the outside air temperature is determined again. If the outside air temperature is lower than the predetermined temperature, the opening / closing valve is opened again to prevent freezing. .
[0016]
(Claim 2)
In the predetermined time set in a time meter, since they are the predetermined time for counting is downtime antifreezing operation, as claimed in claim 2, set a short predetermined time when the outside air temperature is low, the outside air If the predetermined time is set longer when the temperature is high, freezing is prevented at a frequency corresponding to the degree of the temperature drop of the cold / hot water.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of an absorption air conditioner according to the present invention.
The absorption air conditioner includes an outdoor unit 100 as an absorption heat source unit and a plurality of indoor units RU.
As shown in FIG. 2, the outdoor unit 100 includes a heat source unit main body 101 and a cooling tower (cooling tower) CT. The air conditioner is controlled by the control device 200.
[0018]
In the outdoor unit 100, the heat source unit main body 101 is mainly formed of stainless steel and forms an absorption cycle for freezing a lithium bromide aqueous solution as a refrigerant and an absorbing solution. B is a gas burner as a heating means, A high-temperature regenerator, 2 is a low-temperature regenerator, 3 is an absorber, 4 is an evaporator, and 5 is a condenser. In the absorbent, an inhibitor for inhibiting corrosion due to the reaction between stainless steel and lithium bromide is contained. include.
[0019]
In the high-temperature regenerator 1, the low-concentration absorbing liquid supplied to the inside of the heating tank 11 is heated by the gas burner B, and the cylindrical absorption formed between the medium-concentrating absorbing liquid separating cylinder 12 and the absorbing liquid partition container 13. When the absorption liquid heated through the liquid rising channel 14 rises, the water as the refrigerant in the low-concentration absorption liquid evaporates by heating and is separated as refrigerant vapor (water vapor), and is concentrated by evaporation of the refrigerant vapor. The concentration absorbing liquid is turned inward by the absorbing liquid return plate 15 and returned to the absorbing liquid partition container 13.
[0020]
The medium-concentration absorbing liquid whose concentration has been increased by separating the refrigerant is supplied to the low-temperature regenerator 2 from the medium-concentration absorbing liquid channel L1 opened at the side of the absorbing liquid partitioning container 13.
The separated refrigerant vapor is recovered in the refrigerant recovery tank 10 and supplied to the condenser 5 through the refrigerant flow path L5.
In addition, at the bottom of the absorption liquid partition container 13, an inlet of the heating absorption liquid flow path L <b> 4 for supplying the heated absorption liquid into the evaporator 4 during the heating operation is opened.
[0021]
The refrigerant partition cylinder 17 is joined to the intermediate concentration absorbing liquid separation cylinder 12 inside the lower part of the refrigerant recovery tank 10, and a heat insulating gap 17 a is formed between the intermediate concentration absorbing liquid separation cylinder 12. The heat in the intermediate concentration absorbing liquid separating cylinder 12 is cut off, and the refrigerant in the refrigerant recovery tank 10 is not heated by the high temperature absorbing liquid in the absorbing liquid ascending flow path 14.
In the refrigerant recovery tank 10, the outside of the refrigerant partition cylinder 17 is a refrigerant storage part 10a for storing the separated refrigerant liquid, and the refrigerant liquid stored in the refrigerant storage part 10a is supplied from the refrigerant flow path L5 to the condenser. 5 is supplied.
[0022]
In the low-temperature regenerator 2, the medium-concentration absorbing liquid supplied by the medium-concentration absorbing liquid flow path L 1 that passes through the heat exchanger H in the middle flows from the ceiling of the low-temperature regenerator case 20 and passes through the outer wall of the refrigerant recovery tank 10. Reheated as a heat source, separated into refrigerant vapor and high-concentration absorption liquid by the gas-liquid separator 22, the refrigerant vapor passes from the refrigerant vapor outlet 21 and the gap 5 </ b> A into the condenser case 50, and the high-concentration absorption liquid It is stored in the concentration absorbing liquid receiving portion 23 and supplied to the absorber 3 through the high concentration absorbing liquid channel L2.
[0023]
Note that an orifice (not shown) for limiting the flow rate of the intermediate concentration absorbing liquid flowing from the absorbing liquid partition container 13 to the low temperature regenerator 2 is provided in the intermediate concentration absorbing liquid flow path L1, and the low temperature regenerator is provided. The medium concentration absorbing liquid is supplied into the case 20 due to a pressure difference from the medium concentration absorbing liquid separating cylinder 12. (About 70 mmHg in the low-temperature regenerator case 20 and about 700 mmHg in the medium concentration absorbent separating cylinder 12)
[0024]
In the absorber 3, an absorption coil 31 wound in a coil shape is wound as an absorption tube in which a copper tube is wound in a vertical cylindrical shape inside the evaporation / absorption case 30 and through which the cooling water for exhaust heat flows. The high-concentration absorbent supplied from the high-concentration absorbent receiver 23 of the low-temperature regenerator 2 flows in due to the pressure difference through the high-concentration absorbent flow path L2, and the upper end of the absorption coil 31 is absorbed by the high-concentration absorbent spreader And is deposited on the surface of the absorption coil 31 to form a thin film, which flows downward due to the action of gravity and absorbs water vapor to form a low concentration absorbent. When the water vapor is absorbed, heat is generated on the surface of the absorption coil 31, but it is cooled by the exhaust heat cooling water circulating through the absorption coil 31.
The water vapor absorbed by the absorbing liquid is generated as refrigerant vapor in the evaporator 4 described later.
[0025]
The low concentration absorbent in the absorber 3 is supplied into the heating tank 11 from the bottom 33 through the low concentration absorbent flow path L3 to which the heat exchanger H and the absorbent pump P1 are mounted by the operation of the absorbent pump P1. Is done.
Further, in the absorption coil 31, the exhaust heat cooling water cooled by the cooling tower CT circulates through the cooling coil 51 of the condenser 5 during the cooling operation.
[0026]
The evaporator 4 is a vertical cylindrical shape provided on the outer periphery of the absorption coil 31 in the evaporation / absorption case 30 and has an outer periphery of a partition plate 40 with a large number of communication ports (not shown). A vertical cylindrical evaporation coil 41 made of a flowing copper tube is provided, and a refrigerant liquid spreader 42 is attached above it. The bottom 43 of the evaporator 4 communicates with the bottom of the absorbing liquid partition container 13 in the intermediate concentration absorbing liquid separating cylinder 12 by a heating absorbing liquid flow path L4 having an electromagnetic cooling / heating switching valve 6.
[0027]
With the above configuration, in the evaporator 4, when the refrigerant liquid (water) is caused to flow down on the evaporation coil 41 from the refrigerant liquid spreader 42 during the cooling operation, the refrigerant liquid that has flowed down is brought into the surface of the evaporation coil 41 by surface tension. In the evaporation / absorption case 30 which is lowered to a low pressure (for example, 6.5 mmHg) while being lowered downward due to the action of gravity, the evaporation coil 41 takes away heat of vaporization and evaporates. Cooling hot and cold water for air conditioning flowing inside.
[0028]
In the condenser 5, in the condenser case 50, a dish-shaped refrigerant liquid receiving portion 52 for receiving the refrigerant liquid liquefied by the refrigerant vapor cooled by the cooling coil 51 at a position floating from the bottom of the condenser case 50. The refrigerant liquid receiving part 52 is provided above the refrigerant liquid spraying device 42 of the evaporator 4 and cools the refrigerant liquid by self-cooling of the supplied refrigerant liquid, and the refrigerant The liquid supply path L6 communicates and is assembled.
[0029]
The condenser 5 having the above structure communicates with the refrigerant storage portion 10a of the refrigerant recovery tank 10 through the refrigerant flow path L5 provided with an orifice (not shown) for limiting the refrigerant flow rate, and the refrigerant vapor outlet 21 and The refrigerant communicates with the low-temperature regenerator 2 through the gap 5A, and the refrigerant is supplied by a pressure difference (about 70 mmHg in the condenser case).
During the cooling operation, the refrigerant vapor supplied into the condenser case 50 is cooled and liquefied by the cooling coil 51, and is arranged in the evaporator 4 from the refrigerant liquid receiving portion 52 provided at the lower part of the condenser 5. The refrigerant liquid cooler 53 is supplied via the refrigerant liquid supply path L6.
[0030]
The refrigerant liquid overflowing the refrigerant liquid receiving part 52 is stored in the refrigerant liquid storage part 54 formed by the bottom of the condenser case 50, and the concentration of the absorption liquid circulating in the absorption cycle during cooling operation is maintained substantially high. The cooling performance is ensured. The refrigerant liquid reservoir 54 and the refrigerant cooler 53 communicate with each other through a refrigerant liquid flow path L7 provided with the refrigerant valve 7, and when the refrigerant liquid may be frozen, the valve opening control of the refrigerant valve 7 is performed. As a result, the refrigerant liquid is supplied to the evaporator 4 to prevent the freezing by increasing the vapor pressure in the evaporator 4.
Also, at the start of the heating operation, the refrigerant valve 7 is opened, and all the refrigerant liquid stored in the refrigerant liquid storage unit 54 during the cooling operation is supplied into the evaporator 4 and is heated and circulated during the heating operation. Crystallization is prevented by keeping the concentration of the absorbing solution low.
[0031]
With the above configuration, during cooling operation, the absorption liquid is the high temperature regenerator 1 → the intermediate concentration absorption liquid channel L1 → the low temperature regenerator 2 → the high concentration absorption liquid channel L2 → the high concentration absorption liquid sprayer 32 → the absorber. Circulation is performed in the order of 3 → absorbing liquid pump P1 → low concentration absorbing liquid flow path L3 → high temperature regenerator 1.
Also, the refrigerant is a high temperature regenerator 1 (refrigerant vapor) → refrigerant flow path L5 (refrigerant vapor) or low temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant supply path L6 (refrigerant liquid) or refrigerant. Liquid flow path L7 (refrigerant liquid) → refrigerant cooler 53 → refrigerant liquid sprayer 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3 (absorbing liquid) → absorbing liquid pump P1 → low concentration absorbing liquid flow It circulates in order of path L3-> high temperature regenerator 1.
[0032]
The absorption coil 31 of the absorber 3 that exchanges heat with the absorption liquid and the cooling coil 51 of the condenser 5 are connected to form a continuous coil, and the continuous coil is connected to the cooling tower CT by the cooling water channel 34. As a result, a cooling water circulation path is formed.
In this cooling water circulation path, the cooling water flow path 34 between the inlet of the absorption coil 31 and the cooling tower CT is provided with a cooling water pump P2 for feeding cooling water into the continuous coil, and the cooling water pump P2 The cooling water that passes through the continuous coil by the operation of the above absorbs the heat of absorption by the absorption coil 31 and the heat of condensation by the cooling coil 51 and becomes relatively high temperature, and is supplied to the cooling tower CT.
[0033]
With the above configuration, during the cooling operation, the cooling water in the cooling tower CT is circulated in the order of the cooling tower CT → the cooling water pump P2 → the absorption coil 31 → the cooling coil 51 → the cooling tower CT by the operation of the cooling water pump P2.
In the cooling tower CT, the falling cooling water is partially evaporated into the atmosphere and self-cooling is performed to cool the remaining cooling water, and the cooling water dissipates heat into the atmosphere and becomes a low heat exhaust cycle. Is forming. In addition, evaporation of water is promoted by blowing air from the blower S.
An air conditioning heat exchanger 44 provided in the indoor unit RU is connected to the evaporation coil 41 of the evaporator 4 by a cold / hot water flow path 47, and a cold / hot water pump P 3 is provided in the cold / hot water flow path 47.
[0034]
The indoor unit RU is provided with an air conditioning heat exchanger 44 and a blower 46 through which room air is passed and blown out into the room again.
Each cold / hot water flow path 47 on the downstream side of the air conditioner heat exchanger 44 of each indoor unit RU is provided with a motor-driven on-off valve 48, and according to an operation signal of a remote controller provided in each indoor unit RU. Only the open / close valve 48 provided in the indoor unit RU instructed to operate is opened, and the open / close valves 48 of the other indoor units RU remain closed.
Further, the indoor unit RU is provided with a cold / hot water inlet thermistor 49 for detecting the temperature of the cold / hot water in the cold / hot water pipe upstream of the air conditioner heat exchanger 44.
With the above configuration, the cold / hot water having a low temperature in the evaporation coil 41 is the flow of the evaporation coil 41 → cold / hot water channel 47 → air conditioning heat exchanger 44 → cold / warm water flow for the indoor unit RU whose opening / closing valve 48 is driven to open. It circulates in order of path 47-> cold / hot water pump P3-> evaporation coil 41.
[0035]
The heating absorption liquid flow path L4 and the cooling / heating switching valve 6 are provided for heating operation. During the heating operation, the cooling / heating switching valve 6 is opened to operate the absorption liquid pump P1.
As a result, the high-temperature medium-concentration absorption liquid in the absorption liquid partition container 13 in the medium-concentration absorption liquid separation cylinder 12 flows into the evaporator 4 and is evaporated by the high-temperature vapor (refrigerant vapor) of the medium-concentration absorption liquid. The cold / hot water in 41 is heated, and the heated cold / hot water in the evaporation coil 41 is supplied from the cold / hot water flow path 47 to the air-conditioning heat exchanger 44 by the operation of the cold / hot water pump P3, and becomes a heat source for heating.
The medium concentration absorbing liquid in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, and returns to the heating tank 11 by the absorbing liquid pump P1 through the low concentration absorbing liquid channel L3.
[0036]
In the air conditioner of the present embodiment configured as described above, the absorption liquid pump P1 for circulating the absorption liquid in the absorption cycle, and the cold / hot water cooled or heated by the evaporator coil 41 are passed through the cold / hot water flow path 47 to the indoor unit RU. The chilled / hot water pump P3 for circulating to the air conditioning heat exchanger 44 is configured as a tandem pump driven by the same motor, and the absorption liquid pump P1 and the chilled / hot water pump P3 are always at the same rotation speed at the same time. Rotate with.
[0037]
Next, the control operation of the control device 200 that controls the air conditioner will be described.
The control device 200 is provided in the combustion control of the gas burner B, the control of the tandem pump that drives the absorption liquid pump P1 and the cold / hot water pump P3, the control of the cold / hot water pump P2, the rotation control of the blower S of the cooling tower CT, and the absorption cycle. The control of each of the valves 6 and 7 etc. controls the cooling operation and the heating operation of the air conditioner, and when the operation is stopped, the cold / hot water flow connecting the outdoor unit 100 and the indoor unit RU Freezing prevention operation for preventing freezing of the cold / hot water in the passage 47 is performed.
Hereinafter, only the heating operation and the freeze prevention operation will be described, and the description of the cooling operation will be omitted.
[0038]
[Heating operation]
In the heating operation, the cooling / heating switching valve 6 is opened in response to an instruction to start the heating operation by a remote controller (not shown) provided in the room where the indoor unit RU is installed by the user, and the absorption liquid pump P1 and the cold / hot water pump The operation of the tandem pump that drives P3 is started, and the gas burner B is burned.
In this embodiment, only the indoor unit RU is installed as a target for heating operation. However, in this air conditioning system, as shown in FIG. 6, the outdoor unit 100 supplies cold / hot water to the floor heating panel 300. In the control device 200, whether or not the floor heating panel 300 is installed is determined based on an operation signal from a floor heating panel remote controller (not shown) separately provided in the floor heating panel 300. It discriminate | determines by the presence or absence and performs each control based on the result.
Below, the heating control of the control apparatus 200 is demonstrated with reference to control of the tandem pump shown in FIG.
[0039]
When a heating operation request signal is sent from the remote control, it is determined whether or not the signal is a floor heating operation signal from the floor heating panel remote control. If it is a floor heating operation signal (YES in step 10). ), The inverter that controls the DC motor of the tandem pump is controlled to 110 Hz (step 11), and the rotational speed of the tandem pump is driven at a high rotational speed of 3300 rpm to ensure a large head and flow rate.
[0040]
If it is not a floor heating operation signal (NO in step 10), it is determined whether the number of indoor units RU that are heated is one (step 12). If the number of indoor units RU that are operated is two or more, (NO in step 12), the inverter that controls the DC motor of the tandem pump is controlled to 70 Hz (step 13), the tandem pump speed is driven at a medium speed of 2100 rpm, and the number of operating indoor units RU is 1. In the case of only the stand (YES in step 12), the inverter is controlled to 60 Hz (step 14), and the rotational speed of the tandem pump is driven at a low rotational speed of 1800 rpm.
The rotational speed of the tandem pump controlled to each rotational speed is controlled to a fixed rotational speed only by the number of indoor units RU and floor heating panel terminals connected to the outdoor unit 100, and is detected by various thermistors. It does not depend on temperature.
[0041]
On the other hand, in the heating operation, in the combustion amount control of the gas burner B, based on the cold / hot water temperature Tw detected by the cold / hot water inlet thermistor 49 provided in the cold / hot water flow path 47 in the return portion of the indoor unit RU to the outdoor unit 100. The input of the gas burner B is controlled by a gas proportional valve between 1500 kcal / h and 8000 kcal / h so that the cold / hot water temperature Tw becomes 60 ° C.
Meanwhile, in the indoor unit RU, the rotation speed of the blower 46 is controlled according to the temperature detected by the cold / hot water inlet temperature thermistor 49 that detects the temperature of the supplied cold / hot water.
Further, in the cooling water passage 34, the cooling water pump P2 and the blower S are not driven, and a drain valve (not shown) provided in the cooling water circuit is opened to drain all the water in the cooling water circuit. To do.
[0042]
During the heating operation performed as described above, in the cold / hot water flow path 47 to the indoor unit RU or the floor heating panel 300 as a terminal that is not performing the heating operation, when the outside air temperature is low, Cold and hot water may freeze.
For this reason, in the present embodiment, during the heating operation, the anti-freezing control during heating for preventing freezing of the cold / hot water flow path 47 to the indoor unit RU or the floor heating panel 300 that is not in operation is also performed.
[0043]
Below, the freezing prevention control at the time of heating is demonstrated based on FIG.
[Freezing prevention control during heating]
When the heating operation is performed, it is determined whether or not the outside temperature detected by the outside temperature thermistor 201 provided in the outdoor unit 100 is equal to or lower than a predetermined temperature (for example, 3 ° C.). If it is higher (NO in step 21), it stands by as it is.
When the outside air temperature is equal to or lower than the predetermined temperature (3 ° C.) (YES in step 21), the open / close valves 48 provided in the indoor units RU and the floor heating panel that are not in operation are opened as the freeze prevention operation during heating. (Step 22).
As a result, the hot / cold hot water heated for heating circulates in the cold / hot water flow path 47 including the indoor units RU and the floor heating panel that are not in operation. This heat prevents the cold / hot water from freezing. it can.
[0044]
After that, if the on-off valve 48 is left open, excessive heat of cold / hot water is released into the room where heating operation is not required, and energy is wasted, so that it is detected by the cold / hot water inlet thermistor 49. For the indoor unit RU or the floor heating panel 300 whose cold / hot water temperature has reached 33 ° C. (YES in step 23), the on-off valve 48 is closed (step 24).
In step 23, it is determined whether or not the cold / hot water temperature has reached 33 ° C., but it may be determined whether or not the valve opening time by a timer (for example, 10 minutes) has elapsed.
[0045]
Thereafter, the elapsed time since the opening / closing valves 48 of all the indoor units RU or the floor heating panel 300 that are not in operation are closed is counted, and the elapsed time after the opening / closing of the opening / closing valves 48 is a predetermined time (for example, 15 minutes). ) Has elapsed (YES in step 25), the process proceeds to step 21, and it is determined again whether or not the outside air temperature detected by the outside air temperature thermistor 201 is equal to or lower than a predetermined temperature (3 ° C.). Then, as described above, the opening / closing operation of each on-off valve 48 is performed again.
As described above, in the present invention, when the outside air temperature is equal to or lower than the predetermined temperature (3 ° C.) during the heating operation, the open / close valve 48 is opened on each of the indoor units RU or the floor heating panel 300 that is not in operation. Thus, freezing can be prevented by flowing high-temperature cold / hot water heated for heating into each cold / hot water channel 47.
In the above description, when a predetermined time (15 minutes) has elapsed after the valve is closed, it is determined again whether or not to prevent freezing during heating by determining the outside air temperature. Depending on the outside air temperature, for example, 15 minutes when the outside air temperature is -10 ° C or lower, 30 minutes when the temperature is -10 ° C to -5 ° C, and 60 minutes when the temperature is -5 ° C to -3 ° C. You may change the time.
Moreover, when changing this time measuring time, it is good to determine predetermined time with the combination of the cold / hot water temperature at the time of valve closing, and external temperature.
[0046]
Next, the freeze prevention operation when the heating operation and the cooling operation are not performed will be described with reference to FIG.
[Anti-freezing operation]
The anti-freezing operation is different from the above-described anti-freezing control during heating operation in order to prevent the cold / hot water in the cold / hot water flow path 47 from freezing when heating is not performed in the cold / cold season. This is an operation and is performed only when neither the cooling operation nor the heating operation is performed.
[0047]
When neither the cooling operation nor the heating operation is performed, it is determined whether or not the outside air temperature detected by the outside temperature thermistor 201 provided in the outdoor unit 100 is 3 ° C. or less. No at 31), and waits as it is.
If the outside air temperature is 3 ° C. or lower (YES in step 31), anti-freezing control is performed (step 32), the cooling / heating switching valve 6 is opened, and the DC motor that drives the cooling / heating water pump P3 is controlled, The cold / hot water pump P3 is driven, and the on-off valve 48 provided in each indoor unit RU is opened.
[0048]
In this anti-freezing control, depending on the number of indoor units RU connected to the outdoor unit 100 and the presence / absence of the floor heating panel, when the floor heating panel is connected, the rotation speed is increased, and the floor heating panel is When not connected, according to the number of connected indoor units RU, the number of rotations of the tandem pump is controlled so as to increase as the number increases.
As a result, since the cold / hot water circulates in the cold / hot water flow path 47 including the indoor unit RU, the cold / hot water can be prevented from freezing by the flow of the cold / hot water. Further, when the floor heating panel is not connected and the number of connected air conditioning heat exchangers 44 is small, noise can be suppressed.
[0049]
If the outside air temperature becomes higher than 3 ° C. during the freeze prevention control (NO in step 33), the cooling / heating switching valve 6 is closed and the direct current motor that drives the cooling / heating water pump P3 is stopped. The water pump P3 is stopped, and the on-off valves 48 provided in each indoor unit RU are closed (step 34).
In the opening / closing control of the cooling / heating switching valve 6 in step 32, the cooling / heating water pump P3 is configured as a tandem pump that rotates in the same manner as the absorption liquid pump P1, and therefore, the flow path of the absorption liquid in the absorption cycle is ensured. Because.
[0050]
As described above, according to the present invention, when the outside air temperature is low during the heating operation, the on-off valve 48 is also provided for the floor heating panel 300 connected to the outdoor unit 100 and the indoor unit RU that are not operated. Since the cold water is circulated by opening the valve, freezing can be prevented.
[0051]
In the above embodiment, the cold / hot water pump P3 is constituted by the tandem pump so as to rotate in the same direction as the absorption liquid pump P1, but the cold / hot water pump P3 and the absorption liquid pump P1 may be driven individually. In that case, the valve opening operation of the cooling / heating switching valve 6 in step 32 is not necessary.
[0052]
Although only the air conditioning heat exchanger 44 is provided in the indoor unit RU, in order to perform the dehumidifying operation without lowering the indoor temperature, the heating heat exchanger that heats the air once cooled by the air conditioning heat exchanger 44 May be juxtaposed with the air conditioning heat exchanger 44.
In the above embodiment, the double-effect formula is described, but a single-effect formula may be used. Moreover, you may use a petroleum burner and an electric heater as a heat source.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an absorption air conditioner showing an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of an outdoor unit showing an embodiment of the present invention.
FIG. 3 is a flowchart for explaining the outline of the control operation of the tandem pump for heating operation in the control device of the embodiment of the present invention.
FIG. 4 is a flowchart for explaining an outline of freeze prevention control during heating operation of the control device according to the embodiment of the present invention;
FIG. 5 is a flowchart for explaining anti-freezing operation in the control device of the embodiment of the present invention.
FIG. 6 is a schematic configuration diagram of an absorption air conditioner showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Absorber 4 Evaporator 41 Evaporation coil (Piping for heat exchange)
44 Air conditioning heat exchanger (Heat exchanger for air conditioning)
47 Cold / hot water flow path (cold / hot water circulation circuit)
48 On-off valve 49 Cold / hot water inlet thermistor (cool / hot water temperature detection means)
5 Condenser 54 Refrigerant liquid storage part 6 Cooling / heating switching valve B Gas burner (heating means)
P1 Absorption liquid pump P3 Cold / hot water pump L4 Absorption liquid flow path RU for heating Indoor unit 101 Heat source machine (absorption heat source machine)
100 outdoor unit 200 control device (operation control means, cold / hot water freeze prevention means, timer)
201 Outside temperature thermistor (outside temperature detection means)
300 Floor heating panel

Claims (2)

A regenerator for heating the absorption liquid containing the refrigerant by a heating means to separate the refrigerant vapor from the absorption liquid;
A condenser that cools and condenses the refrigerant vapor separated by the regenerator;
An evaporator for evaporating the refrigerant liquid generated in the condenser under a low pressure;
An absorber that absorbs the refrigerant vapor evaporated by the evaporator into an absorption liquid from which the refrigerant vapor is separated by the regenerator;
While forming an absorption cycle from an absorption liquid pump for returning the absorption liquid from the absorber to the regenerator,
The regenerator and the evaporator are connected by an absorption liquid passage for heating provided with a cooling / heating switching valve, and when the cooling / heating switching valve is closed, the evaporator is used as a cooling source by the operation of the absorption cycle, and When the cooling / heating switching valve is opened, an absorption heat source machine that supplies the absorption liquid heated by the regenerator to the evaporator and uses it as a heating source;
Any air-conditioning heat exchanger and a floor heating panel of number of opening and closing valves provided respectively for blocking the cold and hot water, arranged to be connected in parallel to said evaporator heat exchange pipe which arranged in, for the heat exchanger A cold / hot water circulation circuit for circulating cold / hot water heated or cooled by piping to the heat exchanger for air conditioning and the floor heating panel by a cold / hot water pump;
The cooling / heating switching valve is controlled to be closed during cooling operation, and the cooling / heating switching valve is controlled to be opened during heating operation, thereby providing operation control means for controlling switching between cooling operation and heating operation and starting / stopping operation. In the control device of the absorption type air conditioner,
An outside air temperature detecting means for detecting an outside air temperature when a heating operation is performed by the operation control means;
When the outside air temperature detected by the outside air temperature detecting means is equal to or lower than a predetermined temperature, the hot / cold water freezing that controls the opening / closing of the air conditioning heat exchanger or the floor heating panel that is not in heating operation is controlled. Preventive means ,
When the cold / hot water temperature detected by the cold / hot water temperature detecting means provided in the heat exchanger for air conditioning or the floor heating panel respectively reaches or exceeds the valve closing temperature, the cold / hot water freezing prevention means While closing the on-off valve of the heat exchanger for air conditioning or the floor heating panel that has reached the above,
A control device for an absorption air conditioner , wherein after the predetermined time measured by a timer provided for measuring a predetermined time after the valve is closed, an outside air temperature detected by the outside air temperature detecting means is determined . In claim 2,
The control device for an absorption air conditioner, wherein the predetermined time measured by the timer is set shorter as the outside air temperature detected by the outside air temperature detecting means is lower .

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