JPS58182066A - Method of heating hothouse and heat pump - 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 The present invention relates to a method for heating greenhouses for agricultural and domestic use, and a heat pump directly used for the heating method.

Conventionally, as a heating method for this type of greenhouse, a method is generally used in which greenhouse heating water, which is circulated throughout heat dissipation piping arranged inside the greenhouse, is heated by an M oil boiler installed outside the greenhouse.

In the case of this heating method using a boiler, fuel costs have increased due to the recent rise in oil prices, and the cost has reached 1 UIC, and there are drawbacks such as the risk of fire. be.

In order to solve this problem, the present inventor first supplied groundwater that had just been pumped underground to the heat absorption side of the heat pump, expanded and vaporized Freon, etc., which is the heat medium of the heat pump, and The vaporized heat medium is compressed and liquefied on the heat dissipation side, and the heat dissipated at that time heats the greenhouse heating water that is circulated and supplied to the heat dissipation side of the heat pump. developed a heating method for a greenhouse that is placed underground again, and the present invention is a further improvement on this method.

That is, in the refrigerant circulation system of the heat pump described above, the present invention provides the following steps: (1) A step in which refrigerant is condensed and liquefied by a compressor to generate heat of condensation; , that is, the step of exchanging heat with the greenhouse heating water to heat the greenhouse lv, room water and lowering the refrigerant temperature to the temperature of the greenhouse heating water. The process of rapidly expanding the refrigerant using a single cylinder valve to start the expansion and vaporization of the refrigerant (4) The refrigerant that has started expanding and vaporizing is caused to exchange heat with another medium, that is, groundwater, absorbing the heat of the groundwater. Step (5) of promoting vaporization The desired purpose is achieved by the step of returning the refrigerant, which has been heated to the groundwater temperature by heat exchange in the previous step, to the compressor, and the method and device that performs the entire process sequentially. In the present invention, following steps (1) and (2) above, (
3'] Process of utilizing the residual heat of the refrigerant, in which the temperature of the refrigerant, which has been lowered to the temperature of greenhouse heating water through heat exchange in the previous step, is exchanged with another medium, that is, groundwater, to warm the groundwater (3'') Step (4') in which the refrigerant that has undergone the process is rapidly expanded using an expansion valve to start expansion and vaporization of the refrigerant, as in (3). This method and device further improves the effectiveness of the process by sequentially performing the step (5) through the step of absorbing all the heat of the groundwater and promoting its vaporization by exchanging heat with the groundwater. Since the groundwater whose temperature has been raised in the step (') is exchanged with the refrigerant in the step (4'), the heat exchange effect in the step (4') is enhanced and the amount of groundwater used can be reduced from A to A. This is due to the savings that can be made.

The present invention will be described below with reference to the embodiment shown in FIG.

5- Heat radiation pipes 2 made of fin pipes (pipe with a large number of circular radiation fins attached at close intervals on the circumferential surface) are arranged in a meandering manner on the lower surface of the greenhouse 111', and the entrances and exits of these heat radiation pipes 2 are arranged in a meandering manner.
Connect to the heat radiation side (Freon compression condensation part) of the heat pump 3 installed outside the greenhouse, and create a circulation system for greenhouse heating water between the heat radiation side of the heat pump 3 and the heat radiation pipe 2 inside the greenhouse 1.1'. is forming.

4 is a pump for circulating the above greenhouse heating water;
5.5' is a solenoid valve for turning off or increasing/decreasing the circulation of greenhouse heating water to the heat radiation pipes 2 of each greenhouse.

The heat absorption side (Freon expansion vaporization part) of the heat pump 3 is supplied with the groundwater pumped up by the pump 7 through the pumping vibro inserted into the ground, where heat is removed. The groundwater is returned to the ground by gravity through a return vibrator 8 that is driven into the ground at a location separate from the vibro in the horizontal direction (in the case shown) or in the vertical direction.

Although the above-mentioned returning vibe 8 is branched into two in the drawing, it may be unbranched or branched into three or more branches, and the number is determined depending on the difficulty level of returning groundwater underground. be done.

The underground opening positions of both vibros and 8 must be installed at a sufficient distance (horizontal and/or horizontal direction) to avoid mixing of the groundwater in both pipes. .

According to the above device, the groundwater pumped up through the vibro comes into contact with the heat absorption side of the heat pump 3 and expands and vaporizes the refrigerant Freon, and then returns to the ground via the vibrator 8. On the heat dissipation side, the heat dissipated by compression and condensation of Freon heats the heating water that is circulating in contact with this area, so this heated heating water passes through the heat dissipation pipe 2 in the greenhouse 1.1'. This will heat the greenhouse.

Embodiment 1 In Fig. 2 showing the refrigerant circulation system of the heat pump (3), first, the refrigerant fluorocarbon gas is compressed and condensed by the compressor 3-A, and the refrigerant is heated to about 110°C due to the generation of heat of condensation. (a). When this condensation heat is exchanged with the greenhouse heating non-water flowing from the inlet 2-A to the outlet 2-BK in the first heat exchange section 3-B, the temperature of the greenhouse heating water at the inlet 2-A is 40°C (
i) has a temperature of 45°C (g) at outlet 2-B (amount of water 12Ot)
heated to a degree).

On the other hand, the refrigerant becomes 110% by heat exchange in this heat conversion section 3-B.
The temperature drops from 40°C to 40°C, which is the temperature of greenhouse heating water. (b) The refrigerant that has dropped to a temperature of 40°C rapidly expands by the expansion valve 3-c and begins to expand and vaporize, but the refrigerant temperature at that time is 0 to 5°C (C). This temperature 0-5
The refrigerant at ℃ undergoes heat exchange with the groundwater (6) flowing from the population 6-A to the outlet 6-B in the second heat exchange section 3-D, absorbs heat from the groundwater, and promotes evaporation. temperature 12
It reenters compressor 3-A (d) with heat of ~15°C. At that time, the temperature at the inlet 6-A (temperature 17°C (f) immediately after pumping) to the outlet (temperature at i-B 1
The temperature drops to 2°C (g) (80 tM of water used).

Embodiment 2 This f/11 is an example in which the 21st heat exchange section 3-D in the embodiment section 111 is provided with a preliminary heat exchange section 3-E preceding it, as shown in 81!3 south. The purpose of this heat exchange section 3-E is to heat-exchange the excess heat held by the heat medium that has exited the heat exchange section 3-E to the groundwater immediately after pumping up.

Due to the action of this heat exchanger 3-B, the temperature of the groundwater is reduced at the inlet 6.
17℃ (f) at 1-A increases the temperature by 5 to 10℃ to about 25℃ ()I), which is used for heat exchange section 3-D. It will increase the function of D. In this case, the temperature of the groundwater at outlet 6-B is 10°C.
degree (g')〇Meanwhile, the temperature of the refrigerant leaving the preliminary heat exchange section 3-E drops to 25℃<e>, and then the expansion valve 3-C
It's K to enter. This also applies to heat exchange parts 3 to D.
A-
This means that the amount of groundwater used can be significantly reduced by as much as 30%.

[Brief explanation of the drawing]

Fig. 1 is an explanatory system diagram of a greenhouse heating system to which the present invention is applied, Fig. 2 is an operational system diagram of a heat pump according to Embodiment 1 of the present invention, and Fig. 3 is an operational system of a heat pump according to Embodiment 2. It is a diagram. 2-A・・・・・・・・・・・・Greenhouse heating water inlet 2-B・・・・・・・・・・・・Greenhouse heating water outlet 9-3...・・・・・・・・・－・・・・・・・・・・・・Heat pump 3-A・・・・・・・・・・・・・・・・・・
・Compressor 3-B・・・・・・・・・・・・・・・・・・
First heat exchange section 3-c......
・・・Expansion valve 3-J〕・・・・・・・・・・・・・・・
...Second heat exchange section, 3-E...
......Preliminary heat exchange section 6-A...
・・・・・・・・・Groundwater inlet 6-B・・・・・・・・・
・・・・・・・・・Groundwater outlet 10-

Claims (3)

[Claims] (1) By using a heat pump to exchange heat between the groundwater pumped above ground and the greenhouse heating water circulating in the heat radiation pipes installed in the greenhouse, the circulating water is heated and turned into hot water, which is then used inside the greenhouse. In a greenhouse heating method in which the heat is radiated while the heat is passed through the radiator pipes, the greenhouse is heated, and the groundwater that has undergone heat exchange with the heat pump is returned to the ground. The refrigerant is liquefied by a compressor, then heat exchanged with greenhouse heating river water to heat the greenhouse heating river water, and the refrigerant that has undergone heat exchange with the greenhouse heating water is passed through an expansion valve. The refrigerant is vaporized and heated by the groundwater by exchanging heat with the groundwater before or after rapid expansion through the step,
A method of heating a greenhouse, characterized in that the heating is then returned to the compressor described above. (2) In a circulation system for a refrigerant such as fluorocarbon gas, a compressor is used to compress and liquefy the refrigerant and generate heat of condensation, and a compressor that heats the refrigerant by exchanging the heat of condensation with a heat medium on the load side. a heat exchanger section 1; an expansion valve that rapidly expands the refrigerant that has passed through the heat exchanger section and starts its expansion and vaporization; and a heat exchanger that exchanges heat with groundwater to vaporize and heat the refrigerant that has started the expansion and vaporization. A heat pump characterized in that a second heat exchange section is sequentially provided. (3) In a refrigerant circulation system such as a FFC, there is a compressor that compresses and liquefies the refrigerant and generates condensation heat, and a storage unit that heats it by exchanging the condensation heat with the heat medium on the load side. a preliminary heat exchange section that heats the refrigerant that has passed through the heat exchange section and heats the ground water; and a preliminary heat exchange section that rapidly expands the refrigerant that has passed through the preliminary heat exchange section and an expansion valve that starts expansion and vaporization; and a second heat exchange section that exchanges heat with the heated groundwater through a preliminary heat exchange section to heat the refrigerant that has started expansion and vaporization, and performs vaporization and heating of the refrigerant. A heat pump characterized by being installed sequentially.