JPS6051627B2 - Cooling water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling and hot water supply system, and its purpose is to provide an energy-saving and efficient cooling unit that uses a water heat source connected to a hot water storage tank, even after hot water has been stored in the hot water storage tank. It is an object of the present invention to provide a cooling hot water supply device configured so that cooling operation can be continued.

In the past, for example, an electric water heater directly connected to tap water was connected to a water heat exchanger on the heat source side of a water heat source cooling unit, and the exhaust heat during cooling operation was used to store hot water in the electric water heater. There is a cooling water heater.

However, with this device, once the water level in the tank has completed its cycle,
The temperature of the water entering the water heat exchanger on the heat source side rises, resulting in an overload condition for the compressor, which has the disadvantage that operation must be stopped. In order to eliminate these drawbacks, it is possible to switch to an air-cooled heat exchanger, but this method not only increases equipment costs, but also has the disadvantage that the coefficient of performance of the refrigeration cycle decreases when switching to an air-cooled type. It was hot. The present invention eliminates the above-mentioned drawbacks, and the structure thereof will be explained below with reference to the drawings shown as embodiments. 1 is an outdoor unit of a separate type cooling unit, 2 is an indoor unit,
Compressor 3, heat source side water heat exchanger 4, capillary tube 5
, the indoor heat exchanger 6 constitutes a refrigeration cycle.

A blower 7 is installed in the indoor unit 2 to send cold air generated by the indoor heat exchanger 6 indoors. A high pressure switch 8 is installed on the discharge side of the compressor 3 to protect the compressor when abnormally high pressure occurs. Numeral 9 is a hot water storage tank, 10 is a circulation pump, and 11 is a hot water temperature adjustment valve, which is installed on the outlet side of the heat source side water heat exchanger 4, that is, on the downstream side, and directly adjusts the outlet hot water temperature of the heat source side water heat exchanger 4. The sensing heat sensitive element has the function of automatically maintaining the water temperature at a constant level by opening and closing the valve body and adjusting the amount of circulation.

12 is a hot water outlet pipe, 13 is a hot water outlet tap, 14 is a water supply pipe, 15 is a water supply faucet, and 16 is a pressure reducing check valve to reduce the water supply pressure into the hot water storage tank 9 to keep it constant and prevent backflow to the water pipe.・
17 is a hot water release valve which opens when the hot water temperature exceeds a certain set temperature and discharges the hot water to the outside.

The water supply pipe 14, hot water relief valve 17, and circulation pump 10 are located upstream of the heat source side water heat exchanger 4, and are arranged in this order from the hot water storage tank side: hot water relief valve 17, water supply pipe 14, and circulation pump 10. 18 is a safety valve, 19 is a drain plug, 20 and 21 are drain pipes, 22 is a drain groove, and 23 is a water pipe.

What is shown in FIG. 2 is an example of a hot water relief valve, and 24 is the hot water relief valve main body, which has an inlet 25, an outlet 26, a drain 27, and a valve that moves due to the difference in the acting force between a heat sensitive element 28 and a spring 29. It is composed of a body 30 and a valve seat 31, and when the heat sensitive body 28 senses a temperature higher than the set temperature, the valve body 30 separates from the valve seat 31 to form a gap, and hot water flows out from the drain port 27. It is.

If the hot water relief valve has the structure shown in Figure 2 above, the water pipe 2
It can be installed buried in the water tank, allowing for direct detection of hot water temperature, ensuring accurate operation, and making piping more compact. Since the present invention has the above configuration, by operating the compressor 3, blower 7, and circulation pump 10, it is possible to store hot water in the hot water storage tank 9 while cooling the room.

Here, the circulation amount is automatically adjusted by the hot water temperature regulating valve 11 provided on the downstream side of the heat source side water heat exchanger 4, and the hot water temperature is kept constant. However, as shown in FIG. 3, there is a limit to the flow rate adjustment range, so as the temperature of the hot water in the hot water storage tank 9 rises and exceeds the flow rate adjustment range, the compressor 3 becomes overloaded. Eventually you will have to stop driving. Therefore, if the temperature of the hot water relief valve 17 is set to a temperature that does not cause an overload condition, the hot water from the hot water storage tank 9, which has become high in temperature, will be discharged from the hot water relief valve 17, and the water supply will be completed. Since new water with a low temperature is supplied from the pipe 14 to the heat source side water heat exchanger 4, stable cooling operation can be continued. Further, in the present invention, the hot water temperature adjustment valve 11 is provided on the downstream side of the heat source side water heat exchanger 4, and the hot water relief valve 17 is provided on the upstream side. By placing the hot water in the hot water storage tank 9, old hot water with a slightly lower temperature is discharged from the hot water release valve 17 after going around the hot water storage tank 9, and new hot water is stored in the hot water storage tank 9, so that hot water at a stable temperature is always available. Can store hot water.

FIG. 4 shows the influence of the amount of water discharged from the hot water release valve 17 and the amount of circulation flowing through the hot water temperature regulating valve 11. In this figure, the vertical axis of the solid line A is the inlet water temperature of the heat source side water heat exchanger 4, the vertical axis of the solid line inlet is the temperature of the water discharged from the hot water relief valve 17, the vertical axis of the broken line is the water supply temperature, and the vertical axis of the dashed-dotted line. is the outlet temperature of hot water from the hot water storage tank 9, that is, the temperature flowing into the hot water release valve 17. In this diagram,
When the amount of water discharged exceeds the amount of circulating water, the temperature at the temperature of the water at the water outlet is lower than the temperature at which it flows into the hot water relief valve 17, which indicates that a portion of the supplied water is being directly discharged. Therefore, increasing the amount of waste water than the amount of circulating water is wasting water and is a waste of water resources. Therefore, by setting the amount of water discharged from the hot water release valve 17 to be equal to or less than the amount of circulating water, that is, the flow rate of the hot water temperature regulating valve 11, wasteful use of water resources is eliminated. Furthermore, the cooling capacity is 2000Kc.
In order to maintain the circulating water at about 11h, the amount of circulating water is around 1e/min, so the amount of water discharged from the hot water release valve should be set to 11/min or less. It is thought that the hot water release valve operates very infrequently in consideration of the balance between the required cooling time and the amount of hot water used during the actual cooling season. Furthermore, when the amount of water discharged is less than the amount of circulating water, the inlet water temperature of the heat source side water heat exchanger 4 will rise above the supply water temperature.
Normally, the water supply temperature is around 2rc at most in the summer, so even if the water temperature is slightly higher than this temperature, the coefficient of performance is better than when using an air-cooled heat exchanger, so sufficiently efficient cooling operation can continue. .

As described above, in the present invention, a hot water temperature adjustment valve is installed on the downstream side of the water heat exchanger, and the hot water temperature in the water pipe is directly detected on the upstream side, and old hot water is discharged when the hot water temperature is above a predetermined value. By installing a hot water release valve, old hot water with a slightly lower temperature can be discharged and new hot water can be stored in the hot water storage tank, ensuring a stable hot water temperature at all times.

In addition, by making the discharge amount of the hot water relief valve equal to or less than the amount of circulating water, wasteful use of water resources can be prevented, and water with a stable temperature can always be sent to the water heat exchanger on the heat source side, making it highly efficient. There are effects such as being able to drive.

[Brief explanation of the drawing]

Fig. 1 is a cooling cycle diagram showing one embodiment of the present invention;
The figure is an enlarged sectional view showing an example of a hot water relief valve, Figure 3 is a characteristic diagram of a hot water temperature adjustment valve, and Figure 4 shows the influence of the amount of water discharged from the hot water relief valve and the amount of circulation flowing through the hot water temperature adjustment valve on the water temperature. The relationship diagram shown. 4...Heat source side water heat exchanger, 9...Hot water storage tank, 10...Circulation pump, 11...
Hot water temperature adjustment valve, 17...Hot water release valve.

Claims (1)

[Scope of Claims] 1. A water circulation circuit comprising a heat source side water heat exchanger, a hot water storage tank, and a circulation pump constituting a cooling cycle,
A hot water temperature adjustment valve is installed downstream of the heat source side water heat exchanger,
This air-conditioning hot water supply device is equipped with a detection element that directly detects the temperature of hot water in a water pipe on the upstream side, and a hot water release valve that drains old hot water when the hot water temperature exceeds a predetermined value. 2. The cooling water supply device according to claim 1, wherein the discharge flow rate of the hot water relief valve is made equal to the flow rate of the hot water temperature adjustment valve. 3. The cooling water supply device according to claim 1, wherein the discharge flow rate of the hot water relief valve is set to be lower than the flow rate of the hot water temperature adjustment valve.