JPS633221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for a heat pump cooling water heater equipped with a hot water storage tank, and more particularly to an improvement in controlling the boiling temperature of hot water in the hot water storage tank.

Generally, the operation control device of this type of heat pump cooling water heater is equipped with a hot water temperature setting device that variably sets the boiling temperature of hot water in the hot water storage tank to an arbitrary value within a predetermined temperature range. The amount of heat absorbed from the hot water is given to the water stored in the hot water storage tank to heat it, thereby boiling the hot water to the hot water supply temperature set by the hot water temperature setting device according to the user's preference.

By the way, this type of heat pump type cooling water heater not only performs the above-mentioned independent hot water supply operation, but also operates as a heat source for heating the water stored in the hot water tank without wastefully dissipating the cooling waste heat absorbed from the room into the outside air through simultaneous cooling and hot water supply operation, that is, cooling operation. From the viewpoint of energy saving, it is desirable to have the function of boiling the hot water in the hot water storage tank to the temperature set by the hot water temperature setting device.

However, in the conventional system described above, when simultaneous cooling and hot water supply operation is performed, the hot water in the hot water storage tank boils to the hot water supply temperature set by the hot water temperature setting device. If the temperature is on the high temperature side of the specified temperature range, the gas refrigerant that has taken heat from the indoor air during cooling operation will radiate less heat to the hot water tank as the temperature of the hot water rises, so the condensation temperature of the refrigerant will increase. As the air temperature gradually increases, the amount of heat obtained from indoor air gradually decreases, reducing the cooling capacity. At the same time, the discharge gas temperature of the compressor increases, leading to overheating of the cylinder, etc., and reducing the reliability of the compressor. occurs. Conversely, if the set temperature of the hot water temperature setting device is on the low side of the predetermined temperature range, only a part of the cooling waste heat is recovered, and when the temperature supply reaches the above set temperature, the operation status is stopped. When the system switches from simultaneous cooling and hot water supply operation to cooling only operation, the remaining cooling exhaust heat is wastefully dissipated outside, resulting in a problem that the recovery efficiency of the cooling exhaust heat deteriorates.

The present invention has been made in view of the above-mentioned problems, and when the hot water supply is operated solely, the water is boiled to the set temperature of the hot water temperature setting device, and when the cooling water supply is operated simultaneously, the water is boiled to a predetermined temperature within a predetermined temperature range that is fixed in advance. By boiling hot water, we can ensure the ability to boil water at a temperature that meets the user's preference, while simultaneously operating cooling and hot water supply without reducing cooling capacity and maintaining a high recovery efficiency of cooling exhaust heat. The purpose of this is to enable students to perform the exercises while doing so.

To achieve this objective, the present invention has a first hot water temperature setting device 16 that variably sets the boiling temperature of hot water in a hot water storage tank to an arbitrary value within a predetermined temperature range, as shown in FIG.
and a second hot water temperature setting device 17 that fixes and sets the boiling temperature of hot water in the hot water storage tank to a predetermined value within the predetermined temperature range;
A selection circuit 23 that selects the boiling temperature of hot water in the hot water storage tank to be set by the first hot water temperature setting device 16 during a hot water supply alone operation and by the second hot water temperature setting device 17 during a cooling hot water supply simultaneous operation, and a hot water storage tank. The apparatus is characterized in that it includes a heating circuit 30 that boils the hot water in the tank to a temperature corresponding to the set temperature signal of the selection circuit 23.

As a result, in the present invention, during the independent hot water supply operation, the boiling temperature of the hot water is set by the first hot water temperature setting device 16 according to the selection of the selection circuit 23, and the hot water in the hot water storage tank is set according to the user's preference by the heating circuit 30. On the other hand, during simultaneous cooling and hot water supply operation, the boiling temperature of the hot water is set by the second hot water temperature setting device 17 to prevent the hot water in the hot water storage tank from boiling to a predetermined value within a preset fixed temperature range. It was designed to allow

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 2 shows the refrigerant circuit of a heat pump type air-conditioning/heating water heater. 1 is a compressor, 2 is an air conditioning load side heat exchanger installed indoors, 3 is a heat source side heat exchanger, 4 is a hot water storage tank, and 5 is a A hot water supply load side heat exchanger for heating the water stored in the hot water storage tank 4; 6 is an expansion valve for heating and hot water supply; 7 is an expansion valve for cooling and cooling hot water supply; SV ₁ and SV ₂ are connected between each of the above devices. The interposed four-way switching valves SV ₃ to SV ₅ are solenoid valves that cool the room by switching the refrigerant circulation system to the cooling operation cycle shown by the solid line arrow in the same figure during cooling operation, while switching the refrigerant circulation system to the cooling operation cycle shown by the solid line arrow in the same figure during cooling operation, while switching it to the same cycle during heating operation. The room is heated by switching to the heating operation cycle shown by the dashed line arrow in the figure, and during hot water supply operation, the hot water supply operation cycle is switched to the hot water supply cycle shown by the dashed-dotted line arrow in the figure to heat the water stored in the hot water storage tank 4, and during the cooling hot water supply operation, the water supply cycle shown by the dashed line arrow in the figure Switching to the cooling hot water supply operation cycle indicated by the dotted chain arrow, the room is cooled and at the same time the water stored in the hot water storage tank 4 is heated.

Next, FIG. 3 shows an operation switching circuit for switching the operating state of the air-conditioning/heating water heater shown in FIG. 2 to four states: cooling, heating, hot water supply, and cooling hot water supply. In Fig. 3, 8 is an operation switch, 9 is closed when the room temperature is above the predetermined heating T ₁ during cooling operation, and is closed during heating operation.
A room temperature control thermostat that closes when the room temperature is below a predetermined temperature _T2 , _X1 is a relay that turns on when the operation switch 8 and room temperature control thermostat 9 are closed, and _X2 is a relay that turns on when the relay _X1 turns on. The compressor relay is turned on when the normally open contact _X1-1 is closed, 10 is a cold/warm selector switch, and _X3 is a compressor relay that is turned ON when the normally open contact X1-1 is closed. This is a cooling relay that operates ON. Also, X _2-1 is the relay for the compressor mentioned above.
X ₂ normally open contact, X _3-1 is the switching contact of the cooling relay X ₃ , and 11 is the normally open contact of the compressor relay X _2.
When X _2-1 is closed and switching contact of cooling relay X ₃
This is a cooling operation command signal generation circuit that issues a cooling operation command signal when X _3-1 is in the ON side position. Next, before explaining the rest of FIG. 3, for convenience, a hot water supply operation command signal generation circuit that issues a hot water supply operation command signal to heat the water stored in the hot water storage tank 4 will be explained.

FIG. 4 shows the hot water supply operation command signal generation circuit 12, and in FIG. 4, PC ₁ is a first photocoupler that operates upon receiving the cooling operation command signal from the cooling operation command signal generation circuit 11 through the _D2 terminal; _X4 is a selection relay 15 which is turned on via the first transistor _Tr1 when the first photocoupler _PC1 is activated.
16 is a hot water temperature sensor configured with a thermistor with a negative resistance temperature characteristic that is disposed inside or outside the hot water tank 4 and senses the temperature of the hot water in the hot water tank 4; 16 is a hot water temperature sensor that determines the boiling temperature of the hot water in the hot water tank 4; A first hot water temperature setting device 17 variably sets the boiling temperature of hot water in the hot water storage tank 4 to a predetermined value within the predetermined temperature range (e.g. 55°C). The second hot water temperature setting device _X4-1 is the switching contact of the selection relay _X4 .
Further, when _the selection relay X ₄ is turned _OFF , that is, when the switching contact The actual water temperature is compared with the reference voltage value Vs ₁ set by the resistors R ₁ and R ₂ and the first water temperature setting device 16
When the set temperature _T3 is below, the output becomes "L" level, while when _the selection relay _X4 is activated, that is, when the switching contact 17 and the reference voltage value Vs ₁ set by the two resistors R ₁ and R ₂ above _.
A comparator whose output becomes "L" level when the actual hot water temperature is less than the set temperature _T4 of the second hot water temperature setting device 17. _Tr2 is a transistor that turns OFF when the comparator 18 outputs "L". It is. Furthermore, 20 is a manual hot water supply switch, and the hot water supply switch 20 has a power terminal 20a, a grounded OFF terminal 20b, and an open ON terminal.
It has a side terminal 20c. In addition, PC ₂ is a second photocoupler that operates in response to the cooling operation command signal from the cooling operation command signal generation circuit 11, Tr ₃ is a third transistor that is turned ON by the operation of the second photocoupler PC ₂ , and 21 is the hot water supply A first inverter that outputs "H" when the power supply terminal 20a of the switch 20 is connected to the ON-side terminal 20c and when the third transistor Tr ₃ is turned on; 22 is the "H" output of the first inverter 21; Sometimes the second
The second inverter outputs "L" when the transistor Tr ₂ turns OFF, and X ₅ is the second inverter 2.
This is a hot water supply relay that turns ON when the 2nd "L" output is activated and issues a hot water supply operation command signal.

Next, the remainder of FIG. 3 will be explained. In FIG. 3, X _5-1 is a normally open contact of the hot water supply relay X ₅ , and 25 is a switch for switching and opening/closing the four-way switching valves SV ₁ , SV ₂ and solenoid valves SV ₃ to SV ₅ in FIG. 2. 26 is a heating switching circuit that similarly switches the refrigerant circulation system to a cooling operation cycle, 27 is a hot water supply switching circuit that switches to a hot water supply operation cycle, and 28 is a cooling hot water supply switching circuit that switches to a cooling hot water operation cycle. It is. In addition, X ₆ is turned ON by closing the normally open contact X _5-1 of hot water relay X ₅ .
The activated relay, X _6-1 , is a switching contact of the relay X ₆ , and the switching contact X _6-1 is connected to the cooling switching circuit 25.
The cooling switching circuit 25 is selectively switched between the cooling operation command signal generation circuit 11 and the cooling hot water supply switching circuit 28 when the cooling operation command signal from the cooling operation command signal generation circuit 11 is on the OFF side.
On the other hand, when in the ON position, the cooling/hot water supply switching circuit 28 is operated. moreover,
X ₇ is a relay that turns on when the air conditioning/hot water switching circuit 28 is activated, and X _7-1 is a normally closed contact of the relay X ₇ , and when the normally closed contact X _7-1 is opened, the hot water switching circuit 27 is activated. The hot water supply switching circuit 27 is prevented from operating when the cooling hot water supply switching circuit 28 is operating. In addition, X ₈ is ON when normally open contact X _2-1 of compressor relay X ₂ is closed and switching contact X _3-1 of cooling relay X ₃ is in the OFF side.
The activated heating relays X _8-1 and X _8-2 are the normally open contact and the normally closed contact of the heating relay X ₈ , respectively, and the normally open contact X _8-1 of the heating relay X ₈
By closing, the heating switching circuit 26 is operated, and by opening the normally closed contact _X8-2 of the heating relay _X8 , the operation of the hot water supply switching circuit 27 is prevented.

Therefore, during hot water supply only operation, that is, the hot water supply relay
Hot water supply switching circuit 2 due to the closing of normally open contact X _5-1 of X ₅
7 is activated, the cooling operation command signal generation circuit 11
Due to the non-output of _the cooling _operation command signal from It is set by the setting device 16, and when the cooling operation command signal is generated from the cooling operation command signal generation circuit 11 and the normally open contact X _5-1 of the hot water supply relay X ₅ is closed during simultaneous cooling and hot water supply operation, relay X is set. ₆ is turned on _and its switching contact ₄ is ON
The selection circuit 23 is configured to select setting of the boiling temperature of the hot water in the hot water storage tank ₄ by the second hot water temperature setting device 17 when the switching contact are doing. In addition, during the hot water supply standalone operation (that is, when the hot water supply switching circuit 27 is commanded), the heat absorbed by the heat source side heat exchanger 3 is transferred to the hot water storage tank 4 by the hot water supply load side heat exchanger 5 due to the operation of the hot water supply switching circuit 27. The stored water in the hot water tank 4 is sent to the first hot water temperature setting device 16 selected by the selection relay _X4 .
At the _same time, when cooling and hot water supply are simultaneously operated (in other words, when the cooling and hot water supply switching circuit 28 is activated, the cooling exhaust heat absorbed by the air conditioning load-side heat exchanger 2 due to the operation of the cooling and hot water supply switching circuit 28) is heated to the set temperature T3. is applied to the hot water storage tank 4 by the hot water supply load side heat exchanger 5 to boil the water stored in the hot water storage tank 4 to the set temperature T ₄ of the second hot water temperature setting device 17. Selection circuit 2
A heating circuit 30 is configured to raise the temperature to a temperature corresponding to the set temperature signal of No. 3.

Next, the operation of the above embodiment will be explained. Currently, the cold/warm selector switch 10 is in the cooling side position, the hot water supply switch 20 is in the ON side position 20c, the operation switch 8 is closed, and the cooling relay is in the ON position 20c.
Switching contact X _3-1 of X ₃ is in the ON position.

In this state, when the room temperature is lower than the predetermined temperature _T1 , that is, when cooling operation is not required, the room temperature control thermostat 9 is open, so the compressor relay _X2 does not turn ON and its normally open contact X _2-1 remains open, the cooling operation command signal generation circuit 11 does not generate a cooling operation command signal, and the cooling switching circuit 25
never operates. At this time, _the selection relay
Its switching contact _X4-1 is switched to the OFF side.
Therefore, when the actual hot water temperature in the hot water storage tank 4 becomes equal to or lower than the set temperature _T3 of the first hot water temperature setting device 16, the comparator 18 becomes an "L" output, and the second transistor _Tr2
is turned off and the second inverter 22 outputs "L", so the hot water supply relay _X5 is turned on, its normally open contact _X5-1 is closed, and a hot water supply operation command signal is output. Therefore, the hot water supply switching circuit 27 is activated to perform hot water supply alone operation, and as a result, the hot water in the hot water storage tank 4 is heated to the set temperature T ₃ of the first hot water temperature setting device 16 . At that time, the normally open contact _of the hot water supply relay
When X _5-1 is closed, relay X ₆ is activated and its switching contact X _6-1 is switched to the ON side. The hot water supply switching circuit 28 does not operate.

On the other hand, when the room temperature is higher than the predetermined temperature T ₁ ,
The room temperature control thermostat 9 is closed, the compressor relay _X2 is turned ON, its normally open contact _X2-1 is closed, and the cooling operation command signal generating means 11 generates a cooling operation command signal. Therefore, the selection relay X ₄ is turned ON, its switching contact X _{4 - 1} is switched to the ON side, and the boiling temperature of the hot water is set by the second hot water temperature setting device 17 . As a result, when the actual hot water temperature is higher than the set temperature T ₄ (for example, 55°C), the comparator 18 outputs "H" and the second transistor Tr ₂ turns on, causing the second inverter 22 to output "H". Then,
Hot water supply relay _X5 operates OFF and its normally open contact
X _5-1 will open. For this reason, relay X ₆ is
The OFF operation switches the switching contact X _6-1 to the OFF side, and the cooling switching circuit 25 operates in response to the cooling operation command signal from the cooling operation command signal generation circuit 11, and cooling operation is carried out independently. Become. on the other hand,
When the actual hot water temperature becomes lower than the set temperature T ₄ (for example, 55°C), the operation is reversed to that described above, and this time, the hot water supply relay X ₅ is activated based on the "L" output of the comparator 18.
turns ON and its normally open contact X _5-1 closes, so relay X ₆ turns ON and its switching contact X _6-1 switches from the OFF side to the ON side. As a result, after the cooling switching circuit 25 stops operating, the cooling hot water switching circuit 2
8 is activated, simultaneous cooling and hot water supply operation is performed, and the hot water in the hot water storage tank 4 is boiled to the set temperature T ₄ (for example, 55° C.). At this time, with the operation of the cooling/hot water switching circuit ₂₈ , relay
Since X _7-1 is opened, the hot water supply switching circuit 27 is prevented from starting to operate.

Therefore, during simultaneous cooling and hot water supply operation, regardless of the level of the set temperature _T3 of the first hot water temperature setting device 16, the second
Since the water can be boiled to a predetermined temperature T ₄ (for example, 55°C) that is fixed with the hot water temperature setting device 17,
If the set temperature _T3 of the first hot water temperature setting device 16 is set to the high temperature side of the predetermined temperature range (that is, within the range of 56 to 65 degrees Celsius), when the water temperature reaches the predetermined temperature _T4 , The operating state switches from cooling and hot water supply simultaneous operation to cooling and independent operation, and the refrigerant absorbs heat from the room in the indoor heat exchanger 2 and radiates the heat sufficiently to the outdoors in the heat source side heat exchanger 3, and the condensation temperature becomes low, and the temperature reaches a predetermined level. The cooling capacity is ensured, the discharge gas temperature of the compressor 1 becomes appropriate, and the reliability of the compressor 1 improves.
Conversely, if the set temperature _T3 of the first hot water temperature setting device 16 is set to the low temperature side of the predetermined temperature range, for example, 45°C, the cooling hot water supply will continue until the hot water temperature reaches 45°C to 55°C. Simultaneous operation continues, and
The recovery efficiency of cooling waste heat is increased.

In the above _embodiment , the _{selection relay} A normally open contact X ₃ is provided, and the selection relay X ₄ is controlled ON-OFF depending on the open/closed state of the normally open contact, so that the second hot water temperature is always set when the cooling/warming switch 10 is switched to the cooling side. Vessel 17
may be selected.

As explained above, according to the present invention, hot water is boiled to a temperature according to the user's preference during independent hot water supply operation, and hot water is heated to a predetermined value within a predetermined temperature range fixed in advance during simultaneous cooling hot water supply operation. By boiling the water, it is possible to ensure the performance of boiling water at a temperature according to the user's preference, while also improving the reliability of the compressor and preventing a decline in cooling capacity when air conditioning and hot water supply are operated simultaneously. At the same time, it is possible to efficiently recover cooling waste heat, thereby improving the performance and economic efficiency of the cooling water heater.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
4 to 4 show embodiments of the present invention, FIG. 2 is a refrigerant circuit diagram of a heat pump type air-conditioning/heating water heater, FIG. 3 is an electric circuit diagram showing an operation switching circuit, and FIG. 4 is a hot water supply operation command signal generation FIG. 2 is an electrical circuit diagram showing the circuit. 4... Hot water storage tank, 16... First hot water temperature setting device, 17
...Second water temperature setting device, X ₄ ...Selection relay, X _4-1
...Selection relay switching contact, X _4-2 ...Selection relay switching contact, 18...Comparator, X ₅ ...
Hot water supply relay, 23... selection circuit, 27... hot water supply switching circuit, 28... cooling hot water supply switching circuit, 30...
heating circuit.

Claims (1)

[Claims] 1. A first hot water temperature setting device 16 that variably sets the boiling temperature of hot water in the hot water storage tank to an arbitrary value within a predetermined temperature range, and a first hot water temperature setting device 16 that variably sets the boiling temperature of hot water in the hot water storage tank to a predetermined value within the predetermined temperature range. Two hot water temperature setting devices 17 and the boiling temperature of hot water in the hot water storage tank are set by the first hot water temperature setting device 16 during hot water supply operation alone, and by the second hot water temperature setting device 17 during simultaneous cooling hot water heating operation. Operation control of a heat pump cooling water heater characterized by comprising a selection circuit 23 for making a selection, and a heating circuit 30 for boiling hot water in a hot water storage tank to a temperature according to a set temperature signal of the selection circuit 23. Device.