CN103244985A - Heat pump hydronic heater - Google Patents

Abstract

The heat pump hot water heating device of the present invention is characterized in that it includes: a heat pump heat source (1); water refrigerant for heat exchange between circulating water and the refrigerant heated by the heat pump heat source (1) A heat exchanger (4); a circulating pump (6) for circulating the circulating water heated by the water refrigerant heat exchanger (4); a hot water storage container (3) for storing hot water; A hot water heat exchanger (5) for heat exchange between the circulating water and the hot water; and a control unit that repeatedly stops and restarts the heat pump heat source (1) operation, thereby heating the hot water. Therefore, even in the case of using a hot water storage tank having an existing hot water supply heat exchanger, the temperature of the hot water supply in the hot water storage tank can be sufficiently raised.

Description

Heat pump hot water heating device

technical field

The invention relates to a heat pump type hot water heating device.

Background technique

A conventional heat pump hot water heater is shown in FIG. 3 .

Conventional heat pump hot water heaters popularized in cold regions such as Europe are hot water heating circulation systems that circulate hot water to heat buildings. The heat pump hot water heater includes a heat pump 16 , a tank 18 for storing hot water, a control unit 17 , and a heating circulation pump 21 . The control unit 17 has three-way valves 23 , 24 and a hot water circulation pump 22 built in. The hot water generated by the heat exchanger 19 constituting the heat pump 16 is supplied into the container 18 through the hot water circulation pipe 26 .

The hot water in the container 18 is sent from the three-way valve 23 to the building for heating by the heating circulation pump 21 through the heating circulation output pipe 27a. The hot water dissipated as heating is returned from the three-way valve 24 to the inside of the container 18 through the heating circulation return pipe 27b.

The hot water in the container 18 is sent to the heat pump 16 by the hot water circulation pump 22 , reheated by the heat exchanger 19 and sent to the container 18 .

In the hot water supply operation, the water from the water supply pipe 28 passes through the heat exchanger 20 for hot water supply in the container 18, exchanges heat with the hot water in the container 18 to generate hot water, and passes through the hot water supply pipe 29. supply. Moreover, when the hot water in the container 18 is not sufficiently heated by the heat pump 16, it is heated by the heater 25 (for example, refer patent document 1).

In addition, a heat pump type hot water heater popularized mainly in Northern Europe is shown in FIG. 4 . The structure shown in Fig. 4 is compared with Fig. 3, and the container specification is different.

The hot water generated by the heat pump 16 is sent from the three-way valve 23 in the control unit 17 to the building through the heating circulation output pipe 27a by the heating circulation pump 21 without passing through the container 30 .

During the hot water supply operation, the hot water generated by the heat pump 16 is sent from the three-way valve 23 to the hot water supply heat exchanger 31 in the container 30 to dissipate heat in the container 30 . In addition, when the hot water in the container 30 is not sufficiently heated by the heat pump 16 , it is heated by the heater 25 . The container 30 is supplied with water by the water supply pipe 28 and by the hot water supply pipe 29 with hot water.

Moreover, in the normal heating operation of the heat pump type hot water heater, the hot water circulation pump 22 is used to circulate hot water, and when the temperature of the hot water detected by the temperature sensor 32 is detected When the set temperature is higher than the predetermined temperature, the operation of the heat pump 16 is stopped.

The same applies to the case of generating hot water in the container 30, and when it is detected that the temperature of the hot water detected by the temperature sensor 32 is higher than a predetermined set temperature, the operation of the heat pump 16 is stopped. The set temperature in this case is determined by the set temperature of the remote control device and the temperature for protecting the compressor (not shown) in the heat pump 16 (for example, refer to Patent Document 2 and Patent Document 3).

Prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2008-39305

Patent Document 2: JP-A-2011-47607

Patent Document 3: JP-A-2004-156848

Contents of the invention

The problem to be solved by the invention

Conventionally, in cold regions such as Europe, hot water heaters using boilers using oil or natural gas as heat sources have been popular before heat pump hot water heaters became popular.

Therefore, when installing a heat pump type hot water heater, the existing tank for storing hot water may be used. Conventional hot water storage tank heat exchangers for hot water supply are aimed at boilers using oil or natural gas, and there are various types ranging from high heat exchange efficiency to low heat exchange efficiency. When a heat pump type hot water heater is installed and operated in a hot water supply heat exchanger having a low heat exchange efficiency, the temperature of the water in the container may not rise sufficiently.

When the heat exchange efficiency of the hot water supply heat exchanger is low, the heat of the circulating hot water is not transferred to the water in the container, and the temperature of the circulating hot water rises. Therefore, it is detected that the temperature of the hot water detected by the temperature sensor is higher than the determined set temperature by a predetermined temperature, and the operation of the heat pump heat source device is stopped.

Therefore, the operation of the heater increases, and it is not possible to obtain thermal efficiency and power saving effect that fully utilize the characteristics of the heat pump. In a container without a heater, hot water cannot be sufficiently generated in the container.

In addition, even if the existing tank for storing hot water is not used, when a tank not recommended by the sales company that provides the heat pump type hot water heater is used, the same phenomenon as above may occur.

The present invention solves the above-mentioned conventional problems, and aims to provide a heat pump type hot water heater that can be operated even when a hot water storage container having a conventional hot water supply heat exchanger is used. The temperature of the hot water supplied in the hot water storage container is sufficiently raised.

method used to solve the problem

In order to solve the above-mentioned existing problems, the heat pump hot water heating device of the present invention is characterized in that it includes: a heat pump heat source device; agent heat exchanger; circulation pump for circulating the above-mentioned circulating water heated by the above-mentioned water-refrigerant heat exchanger; a hot water storage container for storing hot water; A heat exchanger for water; and a control unit, wherein the control unit repeatedly stops and restarts the operation of the heat pump type heat source device, thereby heating the hot water to be supplied.

Thus, the heat pump heat source device is repeatedly stopped and restarted until the heat of the circulating water generated by the water-refrigerant heat exchanger is sufficiently transferred to the water in the hot water storage container, thereby being compatible with the water supply. Regardless of the heat exchange efficiency of the hot water heat exchanger, the temperature of the supplied hot water in the hot water storage container is sufficiently raised.

Invention effect

According to the present invention, even when the hot water storage tank having the conventional hot water supply heat exchanger is used for operation, the temperature of the hot water supply in the hot water storage tank can be sufficiently increased.

Description of drawings

FIG. 1 is a configuration diagram of a heat pump hot water heater according to an embodiment of the present invention.

Fig. 2 is a graph showing the relationship between the output temperature of circulating water and the temperature of hot water supplied in a container during operation of the heat pump hot water heater.

Fig. 3 is a structural diagram of a conventional heat pump hot water heater.

Fig. 4 is a structural diagram of another conventional heat pump hot water heating device.

Description of reference symbols

1 heat pump heat source

3 containers for storing hot water

4 water refrigerant heat exchanger

5 Heat exchangers for hot water supply

6 circulation pump

7 three-way valve

13 Temperature sensor for circulating water

14 Temperature sensor for hot water supply

Detailed ways

The first invention is a heat pump hot water heating device, which is characterized by comprising: a heat pump heat source; a water refrigerant heat exchanger for exchanging heat with circulating water and refrigerant heated by the heat pump heat source; A circulation pump for circulating the circulating water heated by the water-refrigerant heat exchanger; a hot water storage container for storing hot water; a heat exchanger for hot water supply for exchanging heat between the circulating water and the hot water ; and a control unit, wherein the control unit repeatedly stops and restarts the operation of the heat pump heat source device, thereby heating the hot water supply.

Thus, it is possible to provide a heat pump hot water heater that repeatedly stops and restarts the operation of the heat pump heat source until the heat of the circulating water generated by the water-refrigerant heat exchanger is sufficiently transferred to the storage tank. The water in the hot water container can sufficiently raise the temperature of the hot water in the hot water storage container regardless of the heat exchange efficiency of the hot water supply heat exchanger.

The second invention is a heat pump type hot water heater, characterized in that it has a temperature sensor for circulating water that detects the temperature of the circulating water, and when the temperature sensor for circulating water detects a set temperature on the high temperature side, the control unit The operation stop of the above-mentioned heat pump type heat source device is performed.

A heater is provided in addition to the heat exchanger for hot water supply in the container for hot water storage. When the heater and the temperature sensor for detecting the temperature of the hot water supply are arranged on the upper part of the tank than the heat exchanger for hot water supply, the temperature of the hot water supply in the upper part of the tank may rise due to the heating of the heater, but the supply The temperature of the supply hot water in the lower part of the container around the hot water heat exchanger did not rise sufficiently.

Then, the heat pump heat source device is repeatedly operated until the temperature sensor detecting the temperature of the circulating water detects the high-temperature side set temperature, so that the temperature can be raised sufficiently until the hot water supply in the lower part of the hot water storage container .

The third invention is a heat pump type hot water heater, characterized in that it has a temperature sensor for circulating water that detects the temperature of the circulating water, and when the temperature sensor for circulating water detects a set temperature on the low temperature side, the control unit The above-mentioned heat pump type heat source device was operated again. By repeating this operation, it is possible to heat the supplied hot water in the hot water storage container while protecting the compressor in the heat pump type heat source device.

A fourth invention is a heat pump type hot water heater, characterized in that it has a temperature sensor for hot water supply that detects the temperature of the hot water supply, and when the temperature sensor for hot water supply detects a predetermined temperature, the control unit The operation stop of the above-mentioned heat pump type heat source device is performed. The heat pump heat source is repeatedly operated until the temperature of the hot water in the hot water storage container rises to the set temperature set by the remote control, etc., and the circulating water is repeatedly circulated for heat exchange, so the heat can be stored The hot water in the water container is raised to the set temperature.

The fifth invention is a heat pump hot water heater, characterized in that, when the heat pump heat source device continues to operate for a preset predetermined time, the control unit stops the operation of the heat pump type heat source device, so that the heat pump heat source device can be prevented from heating. Heat source protection and unnecessary heating.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited by this embodiment.

FIG. 1 is a block diagram of a heat pump hot water heater according to the present embodiment. First, the configuration of the heat pump hot water heater according to the present embodiment will be described with reference to FIG. 1 .

In the heat pump type heat source device 1, the refrigerant is heated. The heated refrigerant is sent to the water-refrigerant heat exchanger 4 through the refrigerant pipe 12 . As the refrigerant, R410A is used, and fluorocarbon refrigerants can also be used. As the water-refrigerant heat exchanger 4 , a heat exchanger made of overlapping stainless steel plates is used, but a heat exchanger made of double-layered copper tubes may also be used.

The circulating pump 6 sends the circulating water to the water-refrigerant heat exchanger 4 through the circulating water return pipe 11b. In the water-refrigerant heat exchanger 4, heat is exchanged between the circulating water and the heated refrigerant. The refrigerant brings heat to the circulating water. The heated circulating water passes through the circulating water outlet pipe 11a, and is sent to the building from the three-way valve 7 through the heating circulation outlet pipe 15a during the heating operation.

The circulating water that dissipates heat in the building is sent to the water-refrigerant heat exchanger 4 by the circulation pump 6 through the heating circulation return pipe 15b for reheating. Control units (not shown) such as the water-refrigerant heat exchanger 4 , the circulation pump 6 , the three-way valve 7 and the remote controller are assembled into the housing 2 and are mainly installed indoors.

During the heating operation, the temperature of the circulating water can be set with the remote control, and it is mainly adjusted within the range of 35°C to 55°C.

During the hot water supply operation, the circulating water heated up by the water-refrigerant heat exchanger 4 is sent from the three-way valve 7 to the hot water supply heat exchanger 5 in the hot water storage tank 3 . In the heat exchanger 5 for hot water supply, the circulating water radiates heat to the hot water in the hot water storage tank 3 .

The three-way valve 7 is switched to communicate the water outlet pipe 11a with the heating cycle outlet pipe 15a during the heating operation, and connect the water outlet pipe 11a with the hot water supply heat exchanger 5 during the hot water supply operation.

The heat exchanger 5 for hot water supply is constituted by a stainless steel pipe wound in a spiral shape, and is fixed to the inside of the container 3 for hot water storage by welding. The container 3 for storing hot water is supplied with water by a water supply pipe 9 , and is supplied with hot water by a hot water supply pipe 10 . The temperature of the supply hot water stored in the hot water storage container 3 can also be set by the remote controller, and is mainly adjusted from 35°C to 75°C.

When heating the hot water in all the hot water storage containers 3 from normal temperature, the circulating water is sent to the hot water supply heat exchanger 5 to heat the water in the hot water storage containers 3 . After a certain period of time set by the remote controller, the heater 8 works to start heating. That is, the control unit operates the heat pump heat source device 1 and the circulation pump 6 without energizing the heater 8 for a certain period of time set by the remote controller.

When the set temperature (for example, 50°C) of the hot water supply in the hot water storage container 3 set by the remote control is below the reference set temperature (for example, 55°C), the temperature sensor 14 for hot water supply detects that When the temperature is set (for example, 50° C.), the control unit stops the operation of the heat pump heat source 1 and the circulation pump 6 , and stops the heater 8 from being energized.

When the set temperature of the hot water supply set by the remote controller (for example, 75°C) is higher than the reference set temperature (for example, 55°C), the temperature sensor 14 for hot water supply detects that the reference set temperature (for example, 55°C ), the control unit stops the operation of the heat pump heat source 1 and the circulation pump 6, and the heater 8 continues to be energized until the set temperature is detected for heating.

In the heat pump hot water heating device of this embodiment, the output of the heat pump heat source device 1 is 16kW, and the surface area of the heat exchanger for hot water supply in the recommended hot water storage container is about 1.4m2, which can generate heat at 55°C. water.

At this time, the temperature of the circulating water detected by the circulating water temperature sensor 13 installed on the circulating water output pipe 11a for the refrigerant water heat exchange is about 60°C. When the temperature of the circulating water is increased, the temperature of the refrigerant is also increased, and the pressure of the compressor (not shown) in the heat pump heat source device 1 is increased. In the control unit, the high temperature side setting temperature of the circulating water used to protect the compressor is preset. When the circulating water temperature sensor 13 detects the high temperature side setting temperature, the control unit stops the operation of the heat pump heat source device 1 . The set temperature on the high temperature side is set to, for example, 60°C.

In the case of using the hot water storage container 3 whose heat exchange efficiency of the hot water supply heat exchanger 5 is small, for example, when the surface area of the hot water supply heat exchanger 5 is ^0.8 m Since the heat of the hot water in the water tank 3 decreases, the temperature of the circulating water reaches the set temperature on the high temperature side when the temperature of the hot water in the hot water storage tank 3 does not rise sufficiently.

Even if the temperature of the circulating water reaches 60°C, the temperature of the supplied hot water in the hot water storage container 3 is about 40°C. In order to further increase the temperature of the supply hot water, the heater 8 is energized. Then, by heating with the heater 8, the temperature of the hot water supplied in the hot water storage container 3 becomes the set temperature.

The heater 8 uses a sheathed heater, which has lower thermal efficiency than a heat pump, so it is more energy-saving to generate hot water through the heat pump as much as possible. Therefore, as shown in the graph of FIG. 2 , the control unit repeatedly stops and restarts the operation of the heat pump heat source device 1 to heat the hot water in the hot water storage container 3 .

When heating the hot water in the hot water storage container 3, the temperature of the circulating water and the temperature of the hot water rise, the circulating water temperature sensor 13 detects the set temperature on the high temperature side, and the control unit stops the heat pump heat source device 1 operation. When the temperature of the hot water supply is below the set temperature set by the remote controller and below 55° C., the control unit continues to operate the circulation pump 6 .

When the operation of the heat pump heat source device 1 is stopped and the operation of the circulation pump 6 is continued, the temperature of the circulating water drops. Therefore, when the circulating water temperature sensor 13 detects the preset low-temperature side set temperature, the control unit makes the heat pump heat source device 1 operate again, so that the heat pump type heat source device 1 operates again to supply heat to the heat supply in the container 3. The water is heated.

In this way, after repeated operation and stop of the heat pump heat source device 1 several times, when the temperature sensor 14 for hot water supply detects the set temperature, the control unit stops the operation of the heat pump heat source device 1 and the circulation pump 6 . In this embodiment, even if the heat exchange efficiency is low when the surface area of the heat exchanger 5 for hot water supply is 0.8 m ² , the temperature of the hot water supply can be increased to 55°C.

In addition, when heating the hot water in the hot water storage container 3, when the heat pump heat source device 1 and the heater 8 are energized at the same time, the hot water in the upper part of the hot water storage container 3 is at a faster rate. The set temperature is reached within a certain period of time, but sometimes the hot water supplied below the heater 8 does not reach the set temperature.

Therefore, as far as the heat pump heat source device 1 is concerned, the heat pump type heat source device 1 is operated to sufficiently increase the temperature of the hot water supply until the temperature sensor 13 for circulating water detects the high temperature side set temperature, thereby enabling the water to be heated in a relatively short period of time. A small amount of hot water is used for a period of time, and hot water heated up to a set temperature is generated in the entire hot water storage container 3 .

In addition, when the heat exchange efficiency of the hot water supply heat exchanger 5 of the hot water storage container 3 is small, and the container does not have the heater 8 or the container with the wiring of the heater 8 removed, even if repeated Even if the heat pump type heat source device 1 is operated to heat the supplied hot water in the hot water storage container 3, the set temperature may not be reached in some cases. Therefore, after the heat pump heat source device 1 continues to operate for a preset predetermined time, the operation is stopped to prevent protection of the heat pump heat source device 1 and unnecessary heating.

Industrial Utilization Possibility

As described above, the heat pump type hot water heater of the present invention can make the water in the hot water storage container Since the temperature of the hot water is sufficiently raised, it is also useful for a hot water heating device using an existing oil or natural gas boiler as a heat source, or a hot water heating device using an electric heater as a heat source.

Claims (5)

1. A heat pump type hot water heating device, characterized in that it comprises: heat pump heat source; A water-refrigerant heat exchanger for heat exchange between circulating water and the refrigerant heated by the heat pump heat source; a circulating pump for circulating the circulating water heated by the water refrigerant heat exchanger; Hot water storage containers for storing hot water; a heat exchanger for hot water supply that exchanges heat between the circulating water and the hot water supply; and control unit, where The control unit repeatedly stops and restarts the operation of the heat pump heat source to heat the hot water. 2. The heat pump hot water heating device according to claim 1, characterized in that: A temperature sensor for circulating water is provided to detect the temperature of the circulating water, and the control means stops the operation of the heat pump heat source device when the temperature sensor for circulating water detects a high temperature side preset temperature. 3. The heat pump hot water heating device according to claim 1, characterized in that: A temperature sensor for circulating water is provided to detect the temperature of the circulating water, and the control unit restarts the operation of the heat pump heat source when the temperature sensor for circulating water detects a low temperature side preset temperature. 4. The heat pump hot water heating device according to any one of claims 1 to 3, characterized in that: There is a temperature sensor for hot water supply for detecting the temperature of the hot water supply, and the control means stops the operation of the heat pump type heat source device when the temperature sensor for hot water supply detects a predetermined temperature. 5. The heat pump hot water heating device according to any one of claims 1 to 4, characterized in that: When the heat pump heat source device continues to operate for a preset predetermined time, the control unit stops the operation of the heat pump heat source device.

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