JPS63209526A - Cooling and heating apparatus for culture of plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plant cultivation heating and cooling device for cooling and heating a plant cultivation room.

[Conventional technology]

BACKGROUND ART In recent years, in plant cultivation, it has become common practice to store surplus heat within a plant cultivation room, efficiently extract it at night, and utilize it for plant cultivation. In particular, not only heating but also cooling of plant cultivation rooms is becoming necessary. As a conventional heating device 1 related to such plant cultivation,
A proposal disclosed in Publication No. 4342 is known. This proposal consists of configuring a heat pump by providing an air heat exchanger on the air inlet [1 side] and the air outlet side of the heat storage device, and between these two air heat exchangers and the compressor suction side of the heat pump. An air heat exchanger installed outside the house is connected to the house, and the house external air heat exchanger can be selectively switched and used depending on the operating condition.

Also proposed by the applicant of the present application: Japanese Patent Publication No. 61-834:
An air conditioner disclosed in Japanese Patent No. 3 is also known, in which heat can be transferred in both directions from the heat storage tank to the outdoor heat exchanger and from the outdoor heat exchanger to the heat storage tank by means of heat transfer means. This device includes a steam riser pipe and a liquid downcomer pipe that communicate with a first heat exchanger disposed in an indirect heating tank and a second heat exchanger disposed adjacent to an outdoor heat exchanger, respectively. A roughly inverted U-shaped riser pipe (hereinafter referred to as a heat flow control heat exchanger) with electric heaters attached near both lower ends is provided in the middle of the liquid downcomer pipe, and both heaters are connected to each other. By controlling the energization to the heat exchanger, heat is transferred in both directions between the heat storage tank and the outdoor heat exchanger. In addition to these, prior art related to the heat flow controllability and heat exchangers are those proposed in Japanese Patent Application No. 108634/1982 and Utility Application No. 29245/1983.

[Problem that the invention seeks to solve]

The first of the above conventional techniques. The proposal proposed in the publication has the effect of increasing heat storage even when there is little radiation during the day and effectively heating the inside of the house even when the heat radiation load is large at night, but it does not take into account air conditioning. The problem was that there was no. In addition, what was proposed in the second publication enables heat to be transported in both directions between the outdoor heat exchanger and the heat storage tank using a simple heat transfer device without moving parts, and allows the cold heat stored in the heat storage tank to be transferred. Although it can be effectively used for indoor heating and cooling, it has not yet reached the point where it can store heat and cold heat efficiently enough.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heating and cooling device for plant cultivation that can effectively cool and heat a plant cultivation chamber with a simple system configuration.

[Means for solving problems]

In order to achieve the above object [1], the present invention provides a heating and cooling system for plant cultivation that transfers heat between an indoor heat exchanger and an outdoor heat storage device. an exchanger, a heat medium, a latent heat storage capsule and a second
an outdoor heat storage device housing a heat exchanger; a third heat exchanger that supplies hot or cold heat to a heat medium in the heat storage device; A steam transfer pipe connecting one end of each of the heat exchanger and the second heat exchanger, a tank connected to the other end of the first and second heat exchangers, and a substantially opposite end connected to the tank at both ends. It is equipped with a heat flow control heat exchanger consisting of a U-shaped vertical double pipe and a heater provided at the base of the vertical double pipe, and a closed circulation path formed by a liquid return pipe. It is composed of

[Effect]

According to the above configuration, the cultivation room and heat storage are heated by the boiling-solidification effect caused by heating one side of the riser pipe by one of the pair of heaters of the highly reliable heat flow control heat exchanger that has no moving parts. A large amount of heat can be efficiently transported with a small temperature difference in both directions between the device and the device. Furthermore, by changing the freezing point of the heat medium in the heat storage device and the latent heat storage material in the latent heat indirect heating capsule, warm heat and cold heat of different temperatures can be efficiently stored in a small device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the heating and cooling apparatus for plant cultivation according to the present invention will be described below with reference to the drawings.

A first embodiment of the present invention is shown in FIGS. 1 to 4. As shown in Figure 1, this device consists of a heat storage device 1, a heat pump 2
and a heat flow controllable heat exchanger 3. The heat storage device 1 includes a container 4 and a heat medium 5 filled in the container 4 such as water, polyethylene glycol, calcium chloride, etc.
and a heat storage capsule 6. The heat storage capsule 6 is formed into a sealed cylindrical shape as shown in FIGS. 2 and 3, and contains sodium thiosulfate pentahydrate with a melting point of 48°C, calcium chloride hexahydrate with a melting point of 28°C, etc. The latent heat storage material 7 is filled.

The heat pump 2 includes a compressor 8, an evaporator (condenser) 9,
Pressure reducing valve (expansion valve) 10. Condensers (evaporators) 11 are successively connected by piping 12 to form a cycle. The condenser (evaporator) 11 is immersed in the heat medium 5 in the heat storage device V11. The heat pump 2 is filled with an evaporative liquid such as fluorocarbon, and warm heat or cold heat is generated in the condenser (evaporator) 11 by adiabatic compression by the compressor 8 or adiabatic expansion by the decompression mechanism 10, respectively. It looks like this. The evaporator (condenser) 9 is installed in the outside air, underground, or well water, and absorbs heat from it or radiates it thereto. Then, by switching a valve (not shown), from the compressor 8 to the condenser 11.
When the evaporative liquid flows in the direction, 11 acts as a condenser, 9 acts as an evaporator, and warm heat is stored in the heat medium 5. When the evaporative liquid flows in the opposite direction, 11 acts as an evaporator, 9 acts as a condenser, and cold heat is stored in the heat medium 5.

The heat flow control heat exchanger 3 includes a first heat exchanger 14 and a heat medium 5 provided in the plant cultivation chamber 13, as shown in FIG.
One end of each is connected to a second heat exchanger 15 provided therein through a vapor transfer pipe 16, and the other end is connected to a second heat exchanger 15 provided in the tank 17a.
, 17b and the liquid return pipe 1 via the heaters 18a, 18b.
9a, 19b.

20a, 20b and a riser pipe 21 to form a closed circulation path. An evaporative liquid 22 such as Freon is sealed in this closed circulation path.
This enclosed amount is less than the total internal volume of the pair of tanks 17a and 17b.

The internal volume of either tank is greater than or equal to the internal volume of either tank. Further, the heaters 18a and 18b are provided at the bases of both sides of the riser pipe 21, and a pressure equalizing pipe 23 is attached to the upper part of the riser pipe 21, and is connected to the steam transfer pipe 16. 24 is a fan for guiding the air in the plant cultivation room 13 to the first heat exchanger 14; 25 is a fan for guiding the air in the plant cultivation room 13;
It is a crop within 3.

Next, the operation of this embodiment will be explained. Heater 18a.

18b, the first heat exchanger 14
Heat can be transported from the side to the second heat exchanger 15 side or in the opposite direction. For example, when the heater 18a is energized, the evaporative liquid 22 in the base of the riser pipe 21 on the left side in the figure receives the heat and boils. The resulting bubbles rise due to buoyancy and simultaneously pump up the surrounding liquid 22. This liquid 22 overflows over the top of the riser pipe 21, descends inside the riser pipe 21 on the right side of the figure, and then passes through the liquid return pipe 20b, tank 17b, and liquid return pipe L9b to the second heat exchanger. 15. Further, bubbles generated in the riser pipe 21 are separated from the liquid 22 by the pressure equalization pipe 23 and escape into the vapor transfer pipe 16. This makes it easier for the pumped liquid 22 to flow into the second heat exchanger 15.

The liquid 22 that has flowed into the second heat exchanger 15 receives heat from the heat medium 5 on the outside and evaporates. The steam generated at this time moves within the steam transfer pipe 16 due to the steam pressure difference and enters the first heat exchanger 14. Here, the steam is cooled, releases heat of condensation, and liquefies. This liquefied liquid 22 is transferred to the liquid return pipe 19a.
, the tank 17a, and the liquid return pipe 20a to reach the left root of the riser pipe 21 again, and the same cycle is repeated.

Here, the amount of liquid 22 is the same as that of the pair of tanks 17a.

17b, the first heat exchanger 1
4 acts as a condenser, the excess liquid 22 reduces the condensing heat transfer area and deteriorates heat transfer. Furthermore, if the amount of liquid 22 is less than the internal volume of one of the tanks, when the second heat exchanger 15 acts as an evaporator, there will be a shortage of liquid 22 and the evaporation heat transfer area will decrease, resulting in heat transfer performance. worsen.

The condensed heat released by the first heat exchanger 14 is transmitted to the outside surface of the first heat exchanger 14 to the air sent by the fan 24, and is used to heat the crops 25 in the cultivation room 13, instead of the desk heater 18a. When power is applied to -8b,
Heat is transported from the first heat exchanger 14 side to the second heat exchanger 15 side based on the same principle, and excess heat in the cultivation room 13 is transmitted to the heat medium 5 in the heat storage device 1.

This heat is transmitted to the latent heat storage material 7 inside through the heat storage capsule 6, and a large amount of heat is stored inside due to latent heat when the latent heat storage material 7 melts. When the surplus heat in the cultivation room 13 is insufficient, the heat pump 2 is operated to generate warm heat in the condenser 11 to assist.9 When it is necessary to cool the summer crops 25, the heat pump 2 is used at night, etc. and operate the evaporator 1 in reverse cycle.
1 to generate cold heat and store the cold heat in the heat storage device 1. At this time, cold heat is stored in the latent heat storage material 7 in the heat storage capsule 6, and if the heat medium 5 is made to have a freezing point within this operating temperature range, the latent heat for solidification is utilized. Large cooling and heating exchanges are possible. In this case, it is desirable that the freezing point of the heat medium 5 is lower than that of the latent heat storage material 7, and that the heating medium 5 has two stages. The heat stored in this manner is transported into the cultivation chamber 13 via the heat flow control heat exchanger 3 to cool the crops 25, but in this case, the heater 181) is energized and the internal liquid is 22 may be allowed to flow into the first heat exchanger 14.

According to this embodiment, surplus heat in the cultivation room 13 can be transported and stored in the heat storage device 1 by the heat flow controllable heat exchanger 3 7 Also, the warm and cold heat stored in the heat storage device 1 can be effectively taken out and transported back to the cultivation room using the heat flow control heat exchanger 3, and heating and cooling can be performed with one simple system. Further, by setting the freezing point of the heat medium 5 in the heat storage device 1 to be lower than that of the latent heat storage material 7 in the latent heat capsule 6, the warm heat and cold heat can be efficiently stored in a small device.

FIG. 5 shows a second embodiment of the invention. This example is the second
The heat exchanger 15 and the condenser (evaporator) 11 constituting the heat pump 2 are each shaped like pipes, and are arranged in a meandering manner in the heat medium 5 between the heat storage capsules 6 in the heat storage device 1 to perform heat exchange. It has a heightened sense of sexuality. In this case, the vapor transfer pipe 16 and the piping 12 are each provided above the liquid level of the heat medium 5, and when the heat medium 5 melts, the liquid heat medium that overflows while expanding in volume escapes to the liquid surface, and
We are trying to prevent the destruction of

A third embodiment of the present invention is shown in FIG. 6. In this embodiment, a simple heat exchanger 26 is provided in place of the heat pump 2. The heat exchanger 26 is a reciprocating tube that penetrates the container 4 from the outside to the inside, and is immersed in the heat medium 5. Hot water heated by exhaust heat, solar heat, etc. flows through this reciprocating pipe, and heat is stored in the heat medium 5. When storing cold according to this embodiment, if the heat medium 5 is water, a fan 27 is provided at the top of the container 4, and the fan 27 cools and stores the heat medium 5 while evaporating it. Heat medium 5
If it is other than water, a layer of water 5a is formed on a portion of the heat medium 5, and the water 5a is similarly evaporated to store cold. water 5a
When water becomes insufficient due to evaporation, a valve 28 for introducing water is provided at the top of the container 4, and this valve 28 is opened to replenish water.

This embodiment has the same effects as the previous embodiments using a simple heat exchanger 26.

〔Effect of the invention〕

As described above, according to the present invention, excess heat in the cultivation room is stored in the heat storage device by the heat flow control heat exchanger, and the warm heat and cold heat stored in the heat storage device are transferred by the heat flow control heat exchanger. Since the plants are effectively taken out and transported back to the cultivation room, the interior of the plant room can be efficiently heated and cooled using one simple system. Furthermore, since two heat storage materials having different freezing points are provided in the heat storage device, the warm heat and cold heat can be efficiently stored in a small device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the plant cultivation air-conditioning device according to the present invention, FIG. 2 is a longitudinal sectional view showing the heat storage capsule of FIG. 1, and FIG. 3 is a line taken along line A-A in FIG. 2. 4 is an enlarged sectional view showing details of the heat flow control heat exchanger of FIG. 1, and FIGS. 5 and 6 are configuration diagrams showing other embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1... Heat storage device, 2... Heat pump, 3... Heat flow controllable heat exchanger, 4... Container, 5... Heat medium, 6
... Heat storage capsule, 8... Compressor, 9... Evaporator (condenser), 10... Pressure reducing valve (expansion valve), 11... Condenser (evaporator), 12... Piping, 13.
...Plant cultivation room, 14...First heat exchanger, 15...
Second heat exchanger, 16...steam transfer pipe, 17a, 17b
- Tank, 18a, 18b - Heater, 19.20...Liquid return pipe, 21...Rise pipe, 26
...Heat exchanger (reciprocating tube), 27...Fan.

Claims (5)

[Claims] (1) In a plant cultivation cooling/heating device that transfers heat between an indoor heat exchanger and an outdoor heat storage device, a first heat exchanger provided in a plant cultivation chamber, a heat medium in a container, an outdoor heat storage device that houses a latent heat storage capsule and a second heat exchanger; a third heat exchanger that supplies hot or cold heat to a heat medium in the heat storage device; A steam transfer pipe connecting one end of each of the two heat exchangers, a tank connected to the other ends of the first and second heat exchangers, and a substantially inverted U-shaped vertical tube having both ends connected to the tank. A heating and cooling system for plant cultivation, comprising a riser pipe and a heat flow control heat exchanger comprising a heater provided at the base of the riser pipe and a closed circulator formed by a liquid return pipe. Device. (2) A patent characterized in that the third heat exchanger is a heat pump that connects a compressor, a condenser, a pressure reducing valve or an expansion valve, and an evaporator to form a closed circulation path to circulate an evaporative liquid. A heating and cooling device for plant cultivation according to claim 1. (3) The plant according to claim 1, wherein the third heat exchanger is a reciprocating tube that circulates high-temperature fluid in the heat medium in the heat storage device and a fan that evaporates the heat medium. Cooling and heating equipment for cultivation. (4) The heating and cooling device for plant cultivation according to claim 1 or 2, wherein the heat medium in the heat storage device has a freezing point within the operating temperature range of the heat pump. (5) Plant cultivation according to any one of claims 1 to 4, characterized in that the freezing point of the heat medium in the heat storage device is lower than the freezing point of the latent heat storage material housed in the heat storage capsule. heating and cooling equipment.