JPS60213771A - Heat pump type hot-water supplier utilizing solar heat - Google Patents

Abstract

PURPOSE:To utilize sunshine sufficiently even when the atmospheric temperature is low in winter, increase the amount of evaporation in a heat pump circuit and improve the heat collecting performance of the device by a method wherein an annexed heat exchanger, utilizing an annexed heat collector employing a loop heat pipe as a primary side heating source, is provided on the way of a returning pipe from a heat collector. CONSTITUTION:The annexed heat exchanger 8, utilizing the annexed heat collector 7 employing the loop heat pipe as the primary side heating source, is connected to the returning pipe from the heat collector 4 on the way thereof. In the heat collector 4, which is the evaporating unit of the heat pump circuit, it is hard to obtain sufficient amount of evaporation under low atmospheric temperature, frosting and no-wind condition, however, evaporative heat medium in the heat pump circuit is heated by the annexed heat exchanger 8 and is gasified perfectly when the sun shines and the temperature of the annexed heat collector 7 becomes high enough to operate the loop heat pipe. The heat medium in the annexed heat exchanger 8 is heated by the annexed heat collector 7, therefore, the evaporative heat medium is evaporated sufficiently and gasified as shown in the Mollier diagram by a broken line, thereafter, it enters into a compressor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solar heat pump water heater that uses solar heat and atmospheric heat to raise the temperature of water in a hot water storage tank.

Conventional configuration and its problems In this type of conventional solar heat pump water heater, the heat collector, which is the evaporator of the heat pump circuit that collects solar heat and atmospheric heat, has a heat collector that improves wax conductivity and increases evaporation capacity. Unlike regular solar heat collectors, there were no transparent bodies or exterior plates to prevent convective heat dissipation; instead, fins were simply provided on the heat collection tubes through which the evaporative heat medium passes. Therefore, with this configuration, even if there is sunlight, sufficient evaporation in the heat collector will not occur when the outside temperature is low or when the heat collection tubes and fins are frosted.
Since the evaporative heat medium returns to the compressor in liquid form, there are problems in that the life of the compressor is shortened and the water temperature in the hot water storage tank is difficult to rise, resulting in a decrease in performance.

Purpose of the Invention The present invention solves such conventional problems, and aims to fully utilize solar radiation, increase the amount of evaporation in the heat pump circuit, and improve heat collection performance even when the outside temperature is low in winter. .

Structure of the Invention In order to achieve this object, the present invention provides an additional heat source using an additional heat collector using a loop heat pipe as the primary heat source on the way back from the heat collector which is the evaporator of the heat bomb circuit. An exchanger is installed, and the connections on both the primary and secondary sides of the additional heat exchanger are self-airtight couplings, and the connections on the -next side are self-airtight couplings with one male type and the other female type. It is equipped with a ring.

With this configuration, if the temperature on the additional heat collector side becomes higher than the temperature of the evaporative heat medium emitted from the heat collector of the heat pump circuit due to solar radiation, the loop heat pipe operates to generate evaporative heat in the additional heat exchanger. The medium has the effect of heating and promoting evaporation.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.

In FIG. 1, the heat pump circuit consists of a compressor 1, a heat exchanger 2 corresponding to a condensing section, an expansion valve 3, a heat collector 4 corresponding to an evaporating section, and a hot water storage tank 5 for storing hot water to be heated. A typical solar heat pump water heater is configured with a circulation pump 6 that circulates hot water in a hot water storage tank 5 between the heat exchanger 2 and the secondary side. In this embodiment, an additional heat exchanger 8 is connected in the middle of the return pipe from the heat collector 4, with the additional heat collector 7 using a loop heat pipe as the primary heating source. The additional heat exchanger 8 is as shown in Fig. 2.
- The connection part on the next side is provided with a reciprocating pipe of the loop heat pipe with the additional heat collector 7 and self-airtight couplings 9 and 10, and also with the return pipe from the heat collector 4 on the secondary side. The connecting portion is provided with a male type self-airtight coupling 11 on one side and a female type self-airtight coupling 12 on the other side.

In the above configuration, it is difficult to obtain a sufficient amount of evaporation in the heat collector 4, which is the evaporation part of the heat pump circuit, at low outside temperatures, at MW, or in no wind conditions, but in the presence of sunlight, the temperature of the additional heat collector 7 increases. When the temperature rises and the loop heat pipe operates, the evaporative heat medium of the heat pump circuit is heated in the additional heat exchanger 8 and completely gasified. To explain this using the Mollier diagram shown in FIG. 3, conventionally, as shown by the solid line, the evaporative heat medium is not sufficiently evaporated in the heat collector 4, and some of the evaporative heat medium enters the compressor 1 as a liquid. In this embodiment, since it is heated by the additional heat exchanger 8 by the additional heat collector 7, it is sufficiently evaporated as shown by the broken line, and the evaporative heat medium is gasified and enters the compressor 1.

Therefore, according to the configuration of this embodiment, the evaporative heat medium increases in evaporation and is absorbed into the compressor 1 in a gasified state, which extends the life of the compressor and increases the amount of evaporation in the heat pump circuit. This has the effect of increasing the amount of condensation and increasing the temperature of the hot water storage tank 5 more quickly.

Effects of the Invention As described above, the solar heat pump water heater of the present invention provides the following effects.

(1) An additional heat exchanger using a loop heat pipe as the primary heat source is installed on the way back from the heat collector, which corresponds to the evaporation part of the heat pump circuit.
Even at low outside temperatures, when there is frost, or when there is no wind, the amount of evaporation increases if there is sunlight, which reduces the amount of liquid returning to the compressor, extending the life of the compressor, and increasing the amount of heat collected by the heat pump circuit. This has the effect of causing the water temperature in the hot water tank to rise faster.

(2) The primary side connection of the additional heat exchanger is a self-airtight coupling, and the secondary side connection is also a male self-airtight coupling on one side and a female self-airtight coupling on the other side. Since it is a type coupling, additional heat exchangers and additional heat collectors using loop heat pipes can be easily installed. Furthermore, since the heat pump circuit and the loop heat pipe circuit are different, even if an additional heat collector is provided, there is no need to newly increase or decrease the filling amount of the evaporative heat medium in the heat pump circuit.

[Brief Description of the Drawings] Fig. 1 is a configuration diagram of a solar heat pump water heater according to an embodiment of the present invention, Fig. 2 is a sectional view of the additional heat exchanger, and Fig. 3 is a sectional view of the additional heat exchanger.
The figure is an explanatory diagram showing the operating state of the solar heat pump water heater using a Mollier diagram. 1...Compressor, 2...Heat exchanger, 3.
...Expansion valve, 4... Heat collector, 7...
...Additional heat collector, 8...Additional heat exchanger, 9,1
0...Self-tight coupling, 11...
...Male self-tight coupling, 12.
...Female self-tight coupling.

Claims (1)

[Claims] A heat pump circuit consisting of a heat collector as an evaporator that collects solar heat and atmospheric heat, a compressor, a heat exchanger as a condensing part, and an expansion valve, from the heat collector. An additional heat exchanger is provided in the middle of the return pipe, and the additional heat exchanger is provided with a self-airtight coupling that connects to the reciprocating pipe of the additional heat collector using a loop heat vibrator as a downstream heating source. , a solar heat pump supply bm in which the secondary side of the additional heat exchanger/equipment is also provided with a self-airtight coupling of male type on one side and female type on the other side, which connects to the return pipe from the heat collector.