JPH03181751A - Heat pump apparatus - Google Patents

Abstract

PURPOSE:To maintain the temperature level of heat source water constant by providing a second high temperature heat source which supplies heat source water having a higher temperature than that of the heat source water of a first high temperature heat source to an evaporator. CONSTITUTION:In heat storage operation, first and second change-over valves 17 and 19 are opened to a second heat source tank 13 side, and the heat source water is supplied from a first heat source tank 1 to an evaporator 3 through a heat source inlet pipe 2 and discharged outside after heating a medium. On the other hand, a portion of low temperature heat source water is pumped from a second heat source water tank 13 through a heat source water suction pipe 16, supplied to a condenser 5 where the heat source water cools the medium and rises in temperature, and recovered into the second heat source water tank 13 through a high temperature water pipe 8 and a heat source water recovery pipe 18. This operation lasts for a specified time period, so that the temperature of heat source water in the second heat source water tank 13 becomes higher than that of the heat source water in the first heat source water tank 1. On the other hand, during operation at a normal thermal load, the first and second change-over valves 17 and 19 are opened towards a low temperature water tank 6 side and a high temperature water tank 9 side. When the temperature of heat source water is lower than the design temperature, the water in the second heat source water tank 13, whose temperature is raised by heat storage operation, is mixed into the heat source water, which flows along the heat source water inlet pipe 2, through a heat source water feed pipe 14 and the temperature of the heat source water is kept constant.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a heat pump device, and is particularly suitable for keeping the temperature fluctuation range of heat source water constant throughout the year and always maintaining high efficiency. The present invention relates to a heat pump device.

(Prior Art) A heat pump device is preferably used when supplying heat by transmitting heat held by a heat source to a medium and sending this medium to a place where a consumer needs it.

As shown in Fig. 3, in such a heat pump device, heat source water is taken out from a heat source water tank 1 through a heat source water population pipe 2 and is supplied to an evaporator 3, where the heat is absorbed by a medium and the temperature drops. , the heat source water is led out of the system via the outlet pipe 4.

On the other hand, the medium is evaporated by the heat taken from the heat source water, guided to a compressor (not shown), compressed, and supplied to the condenser 5 as a high-temperature, high-pressure gas. Cooling water is supplied to the condenser 5 from a low-temperature water tank 6 through a low-temperature water population pipe 7, and heat exchange is performed with the medium. That is, the cooling water absorbs heat from the medium and becomes high-temperature water, and the medium is condensed and returned to the liquid phase. The high-temperature water is collected through a high-temperature water pipe 8 into a high-temperature water tank 9, and from there is supplied to each consumer via a hot water supply pipe 10.

In addition, the code|symbol 11 has shown the heat source water intake pipe, and the code|symbol 12 has shown the hot water recirculation pipe, respectively.

(Problem to be Solved by the Invention) However, in such heat pumps, the temperature of the heat source water, which is one of the heat sources, fluctuates greatly throughout the year.
The problem is that performance is inconsistent. Figure 4 shows how the coefficient of performance, which is a measure of the performance of a heat pump, is greatly influenced by the temperature of the heat source water. The coefficient of performance is the ratio between the human power applied to the compressor of the heat pump and the amount of heat taken out by the condenser 5, and the larger the value, the better the performance of the heat pump. If the temperature of the obtained heat source water is high, the coefficient of performance of the heat pump will show a high value, but if only the heat source water of low temperature can be obtained, the coefficient of performance will remain at a significantly low level.

An object of the present invention is to provide a heat pump device that maintains a uniform temperature level of heat source water used as a high heat source of a heat pump.

[Configuration of the Invention (Means for Solving the Problems) To achieve the above object, the present invention includes a first high-temperature heat source and a low-temperature heat source, and the heat source water sent from the first high-temperature heat source is sent to the evaporator. A heat pump that evaporates the heat medium by supplying cooling water sent from a low-temperature heat source to the evaporator as a heating medium, and cooling water sent from a low-temperature heat source to the condenser as a cooling medium for the condenser, and then cooling and condensing the heat medium whose temperature has risen. The apparatus is characterized in that a second high-temperature heat source is provided that supplies the evaporator with heat-source water having a temperature higher than that of the heat-source water of the first high-temperature heat source.

(Function) In the configuration described above, the temperature of the heat source water of the second high-temperature heat source is higher than the temperature of the heat source water of the first high-temperature heat source, and the heat source water of the first high-temperature heat source is By mixing the heat source water of the high-temperature heat source or supplying the heat source water of the second high-temperature heat source to the evaporator instead of the heat source water of the first high-temperature heat source, the temperature level of the heat source water can always be kept uniform. .

(Example) An embodiment of the present invention will be described below with reference to FIG.

Note that the same parts as those explained in FIG. 3 as the conventional technique are denoted by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, the water tank serving as a heat source includes a first heat source water tank 1 and a second heat source water tank 13 that stores hot water at a constant temperature level higher than the heat source water of at least the first heat source water tank 1. It will be done. A heat source water injection pipe 14 that communicates with the heat source water population pipe 2 is connected to this second heat source water tank 13,
A regulating valve 15 is provided within this path. Also, this second
The heat source water tank 13 is supplied with heat source water instead of low temperature water through the condenser 5.
A heat source water extraction pipe 16 is connected to the low-temperature water intake pipe 7 leading to the water, and a first switching valve 17 is provided at this connection.

Further, a second heat source water tank 13 is branched from the high temperature water pipe 8.
A heat source water recovery pipe 18, whose other end is connected to the heat source water recovery pipe 18, is provided together with a second switching valve 19 interposed at the branch portion thereof.

Next, the effect of the above configuration will be explained.

In heat storage operation, the first and second switching valves 17°19
are opened on the second heat source water tank 13 side. At this time, the heat source water is supplied from the first heat source water tank 1 to the evaporator 3 through the heat source water inlet pipe 2, heats the medium, and then is discharged to the outside of the system. On the other hand, a part of the heat source water with a low temperature is pumped up from the second heat source water tank 13 through the heat source water extraction pipe 16, and is supplied to the condenser 5 to cool the medium and eliminate the temperature rise. The water is recovered to the second heat source water tank 13 through the water recovery pipe 18 . By continuing this operation for a certain period of time, the temperature of the heat source water in the second heat source water tank 13 increases,
The temperature becomes higher than the temperature level of the heat source water in the first heat source water tank 1. The economic burden is reduced by using late-night electricity to power the compressor, etc. during this heat storage operation.

On the other hand, operation that carries a normal heat load is performed as follows. During heat storage operation, the first and second switching valves 17.19, which were opened to the second heat source water tank 13 side, are opened to the low temperature water tank 6 and high temperature water tank 9 sides. When the temperature of the heat source water is lower than the design temperature, the water in the second heat source water tank 13 whose temperature has increased due to the heat storage operation is mixed with the heat source water passing through the heat source water population pipe 2 through the heat source water injection pipe 14. At this time, the control valve 15 adjusts the amount of heat source water injected to keep the temperature of the heat source water constant.

As mentioned earlier, the coefficient of performance remains low when the temperature of the heat source water of the heat pump decreases, but in this example, the temperature of the heat source water is maintained at the design temperature, so the performance of the heat pump is always high. can be kept at a value.

Further, FIG. 2 shows another embodiment of the present invention.

This embodiment is an application example where air is used as a heat source. A heat source water intake pipe 21 is connected from the second heat source water tank 13 to the inlet side of the first heat exchanger 20 of the evaporator 3, thereby forming a supply route. Further, a heat source water return pipe 22 is provided that constitutes a return path from the outlet side of the first heat exchanger 20 to the second heat source water tank 13. Furthermore, circulating water intake pipes and outlet pipes 25 and 26, which constitute a circulation path, are connected between the air heat exchanger 23 that uses air as a heat source and the second heat exchanger 24 of the evaporator 3, and the circulating water is It circulates between the air heat exchanger 23 and the evaporator 3.

In this embodiment as well, the heat source water stored in the second heat source water tank 13 is heated by the air heat exchanger 23 and the second heat exchanger 24, which are operated using late-night electricity. By using this heat source water, the operation of the heat pump can be maintained at the design temperature at all times, and it is possible to avoid deterioration in the performance of the heat pump.

[Effects of the Invention] As is clear from the above description, the present invention provides a second high-temperature heat source that supplies heat source water to the evaporator with a temperature higher than that of the heat source water of the first high-temperature heat source. Because of this, the temperature level of the heat source water of the heat pump device can always be kept uniform, and the efficiency of the heat pump can always be kept high.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of a heat pump device according to the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention,
FIG. 3 is a configuration diagram showing a conventional device, and FIG. 4 is a diagram showing the relationship between heat source water inlet temperature and coefficient of performance.

Claims (1)

[Claims] A first high-temperature heat source and a low-temperature heat source, heat source water sent from the first high-temperature heat source is used as a heating medium for the evaporator, and cooling water sent from the low-temperature heat source is used as a cooling medium for the condenser. In the heat pump device, the heat medium is supplied to each of the condensers to evaporate the heat medium, and the heat medium whose temperature has risen is further cooled and condensed, the temperature being higher than that of the heat source water of the first high temperature heat source. A heat pump device comprising a second high-temperature heat source that supplies heat source water at a certain temperature to the evaporator.