JPS6314259B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-conditioning/heating/water supply system that performs air conditioning/heating and hot water supply using cold/hot water from a heat pump type chiller unit.

FIG. 1 is a block diagram showing one embodiment of the present invention, in which 1 is a heat pump chiller unit in which a four-way valve (not shown) for switching between cooling and heating cycles is incorporated into a well-known refrigeration cycle; 2 is a heat pump chiller unit; A water circuit connected to the water side heat exchanger (not shown) of the chiller unit 1, 3 a hot water heat exchanger installed in the water circuit 2, and 4 a water supply heat exchanger connected in parallel with the hot water heat exchanger 3. A heating and cooling circuit connected to the outgoing path 2a and the returning path 2b of the circuit 2, 5 a fan coil unit provided in this heating and cooling circuit 4, and 6 between the connection point of the water circuit 2 and the heating and cooling circuit 4 and the hot water heat exchanger 3. The first
A solenoid valve 7 is a second solenoid valve provided in the air conditioning circuit 4, which works together with the first solenoid valve 6 to select the fan coil unit 5 or the hot water heat exchanger 3 depending on the air conditioning and hot water supply operation. make it work. 8 is a manual valve for adjusting flow resistance provided between the first solenoid valve 6 and the hot water supply heat exchanger 3; 9 is an inlet side of the water side heat exchanger (not shown) of the chiller unit 1;
A heat source primary pump 10 provided between the connection point of the water circuit 2 and the air conditioning circuit 4 is a sister tank whose one end is connected to the suction side of the pump 9 and the other end is connected to a water source. 11 is a hot water tank for storing hot water; 12 is a hot water supply circuit that connects the hot water tank 11 and the hot water heat exchanger 3;
is connected to the lower part of the hot water supply tank 11, and the return path 12b is connected to the upper part of the hot water supply tank 11. Reference numeral 13 denotes a heat source secondary pump provided on the outgoing path of the hot water supply water circuit 12, which is incorporated together with the above-mentioned devices 3, 6 to 10, and constitutes a heat exchange unit 14. 15 is a water supply pipe whose one end is connected to a water source and the other end is connected to the upper part of the hot water tank 11, 16 is a solenoid valve for water supply provided in this water supply pipe, 17 is a bypass valve connected in parallel with this solenoid valve, and 8 is a hot water supply pipe. A hot water supply circuit connected to the lower part of the tank 11, 19 a hot water tap provided in the hot water supply circuit 18, 20 a hot water supply pump provided in the hot water supply circuit 18, and 21 detecting the hot water supply level in the hot water supply tank 11. It is a level detector and operates between E ₁ level and E ₂ level. A temperature detector 22 detects the temperature of hot water in the hot water tank 11, and a control panel 23 houses a control circuit, which will be described later, and is provided in the heat exchange unit 14.

Next, the operation will be explained. FIGS. 2 and 3 are electrical connection diagrams and operation pattern diagrams regarding this device. First, the hot water storage operation pattern will be explained. In FIG. 2, when the operation switch (not shown) of the heat pump chiller unit 1 is turned on, the relay contact 52PX-a of the relay (not shown) on the chiller unit 1 side is closed, and the electromagnetic coil for the heat source primary pump 6 is closed. The contactor coil 52P is energized, and the heat source primary pump 6 operates. Also, at this time, the first
The program timer coil PT1, the second program timer coil PT2 for setting the water supply time of the water supply solenoid valve 16, and the third program timer coil PT3 for setting the operation time of the hot water supply pump 20 are energized. There is. Next, when the operation switch SW-1 of the heat exchange unit 14 is turned on, the time limit contact PT1-a of the first program timer is closed and the relay _coil When energized and the water temperature in the hot water tank 11 is below a predetermined value, the contact 23W of the temperature detector 22 is closed, so the coil 52PQ of the electromagnetic contactor for the secondary heat source pump 13 is energized. Also, due to the energization of relay coil X _Q ,
The contacts XQ-1, XQ-2 and XQ-3 are respectively reversed from the b side to the a side, and the first solenoid valve 6
The coil MV ₁ of the second solenoid valve 7 is instantaneously energized to open the first solenoid valve 6, and the coil MV ₂ of the second solenoid valve 7 is deenergized with a delay, and the second solenoid valve 7 is closed. The heat source primary pump 9 continues to operate. Therefore, regarding the water circuit 2, since the heat pump chiller unit 1 is in the heating cycle, hot water is supplied from the chiller unit 1 to the water circuit 2, and the first solenoid valve 6 and the flow resistance adjustment valve 8
through the hot water supply heat exchanger 3, and then through the heat source primary pump 9 to the heat pump chiller unit 1.
Return to In addition, when contact X _Q -2 of relay coil X _Q switches from side b to side a, relay coil 2
-2 is energized, its time limit contact 2-2-b is closed until a predetermined period of time (for example, 10 seconds) has elapsed, and the second solenoid valve coil MV2 is energized.
The second solenoid valve 7 is opened together with the first solenoid valve 6 for a predetermined period of time (for example, 10 seconds), and then closed. On the other hand, in the hot water supply water circuit 12, the heat source secondary pump 1 is
3, heat exchanges with the hot water supplied from the chiller unit 1 in the hot water heat exchanger 3, and raises the temperature.
Return to hot water tank 11. And hot water tank 11
When the internal water temperature reaches a predetermined value, the temperature detector 22 is activated, the contact 23W is opened, and the heat source secondary pump 1 is activated.
The operation of step 3 is stopped and the hot water storage operation is completed.

Next, the air conditioning operation pattern will be explained. When the air conditioning operation time begins, the coil PT1 of the first program timer is activated, and its time-limiting contact PT1-
Since a is opened, the magnetic contactor coil 52PQ
is deenergized, the heat source secondary pump 13 stops operating, and the contacts X _Q -1, X _Q - of the relay coil X _Q are deenergized.
2 and X _Q -3 returns from side a to side b. Therefore, the time-limiting contact 2-1 is connected by the relay coil 2-1.
-b opens after a predetermined time (for example, 10 seconds), so contrary to the above, the first solenoid valve coil MV ₁ is delayed and deenergized, the first solenoid valve 2 is closed, and the second
The solenoid valve coil _MV2 is instantaneously energized, the second solenoid valve 3 is opened, and the heat source side primary pump 9 is operated via the relay contact 52PX-a and the relay contact _XQ -1. Therefore, in the water circuit 2,
Cold water or hot water from chiller unit 1 is
After passing through the second solenoid valve 7 and being guided to the fan coil unit 5 to cool or heat the room,
It passes through the heat source primary pump 9 and returns to the chiller unit 1, forming a so-called well-known cooling/heating water type air conditioning circuit.

The heat pump type chiller unit 1 is located at the cooling side contact during the summer cooling season to deenergize the four-way valve (not shown) for switching the cooling/heating cycle, and during the winter heating season it is located at the heating side contact to deenergize the cooling/heating cycle switching four-way valve (not shown). It has a manual air-conditioning/heating selector switch (not shown) that energizes a four-way valve (not shown). Therefore, when transitioning from hot water storage operation to cooling operation, contact PTI-a of coil PT of the first program timer
When _the relay coil X _Q is opened, the relay coil ), the heat pump chiller unit 1 can be switched from the heating cycle to the cooling cycle. In addition, when transitioning _from hot water storage operation to heating operation, the relay coil X _Q is deenergized by the first program timer as described above, and the contact of the relay coil However, since the four-way valve (not shown) is energized via the heating/cooling switch (not shown), the heat pump chiller unit 1 remains in the heating cycle.

During the air conditioning operation pattern, the third program timer is set at the same time as the hot water supply usage period, so the coil of the third program timer
PT3 is activated, its time-limited contact PT3-a is closed, relay coil X3 is energized, and relay coil
Since the electromagnetic contactor 52DJ of the hot water supply pump 20 is energized through the second contact X2-b, the hot water supply pump 20 is operated. Therefore, the heated hot water in the hot water tank 11 can be supplied from the hot water tap 19.

In addition, after the hot water supply usage period, the hot water tank 11
Since the water supply time period is set by the second program timer, when the time period comes, the coil PT2 of the second program timer is activated, its time limit contact PT2-a is closed, and the relay coil X1 is activated.
is energized, and relay contact X1-a is closed. At this time, the hot water in the hot water tank 11 is in an intermediate state (first
In the figure, if the state is from _E1 level to _E2 level, the level detector 21 detects this and outputs a signal, and the relay coil closes the contact R-a.
Since _X2 is energized and closes its contact X2-a, the coil MV3 of the water supply solenoid valve 16 is energized, the water supply solenoid valve 16 is opened, and water is supplied. At this time, since the contact X2-b of the relay coil X2 is opened, the coil 52PJ of the electromagnetic contactor of the hot water supply pump 20 is deenergized, and the operation of the hot water supply pump 20 is reliably stopped. When the hot water tank 11 becomes full of water (level _E1 in Figure 1),
Since the level detector 21 detects this and outputs a signal, its contact Ra is opened, the water supply solenoid valve 16 is closed, and the water supply is stopped.

In addition, during the above-mentioned hot water use time period, the hot water in the hot water tank 11 is in a dry state (E ₂ in Fig. 1).
level), the level detector 21 detects this and outputs a signal, so the contact R-a
is closed, the relay coil X2 is energized, its contact X2-b is opened, the coil 52PJ of the electromagnetic contactor of the hot water supply pump 20 is deenergized, and the hot water supply pump 20 is stopped.

As described above, in this invention, since the first program timer separates the hot water storage operation zone and the air conditioning operation zone, the hot water storage operation can be performed, for example, when the air conditioning load is small during the day and air conditioning is not required. . Therefore, the operating efficiency of the heat pump type chilling unit is increased, and efficient cooling, heating, and hot water supply can be performed. In addition, when transitioning from hot water storage operation to air conditioning operation and vice versa, after a predetermined period of time has elapsed after opening the switching valve on the operating side to which the transition should be made, the switching valve on the operating side before the transition is closed. Therefore, the water hammer phenomenon caused by valve switching can be prevented and smooth operation transition can be performed.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an electrical connection diagram regarding this device, and FIG. 3 is an operation pattern diagram. In the figure, 1 is a heat pump chiller unit, 2
3 is a water circuit, 3 is a heat exchanger for hot water supply, 4 is an air conditioning circuit, 5 is a fan coil unit, 6 and 7 are first and second electromagnetic valves, 8 is a flow resistance adjustment valve, 9 is a heat source primary pump, 11 12 is a hot water supply tank, 12 is a hot water supply water circuit, 13 is a heat source secondary pump, 14 is a heat exchange unit, 15 is a water supply pipe, 16 is a water supply solenoid valve, 18
19 is a hot water supply circuit, 19 is a hot water tap, 20 is a hot water supply pump, 21 is a level controller, 22 is a temperature detector,
PT1, PT2, and PT3 are the coils of the first, second, and third program timers.

Claims (1)

[Claims] 1 A heat pump type chiller unit that performs a cooling cycle and a heating cycle, a water circuit that communicates with the water side heat exchanger of this chiller unit, a heat exchanger for hot water supply provided in this water circuit, a heat exchanger for hot water supply that communicates with the water circuit, and that communicates with the water side heat exchanger of this chiller unit. A fan coil unit for indoor air conditioning installed in parallel with the exchanger, a hot water heat exchanger side and a fan coil unit side for switching the water circuit so as to selectively operate the hot water heat exchanger and the fan coil unit. a switching valve, a hot water tank that accommodates hot water that is heated through a hot water circuit that is arranged to exchange heat with the hot water heat exchanger, and a hot water supply that supplies the hot water from this hot water tank to the hot water supply area. circuit, the switching valve is switched to operate the hot water supply heat exchanger, and the hot water storage operation time period for storing hot water in the hot water tank via the hot water supply circuit is switched, and the switching valve is switched to operate the fan coil unit. , a program timer that sets the air conditioning operation time period for air conditioning, and when transitioning from the hot water storage operation to air conditioning operation, after a predetermined time has elapsed since the fan coil unit side switching valve is opened, the hot water supply heat exchanger side switching is performed. A delay device is provided that closes the fan coil side switching valve after a predetermined period of time has passed since the valve is closed and the hot water supply heat exchanger side switching valve is opened at the time of transition from the air conditioning operation to the hot water storage operation. Air conditioning, heating, and hot water equipment.