JPS5921465B2 - Greenhouse heat storage heat exchange hot water heating method using water as a medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a water tank-type heat storage facility underground or above ground in a greenhouse, and also installs an air-to-water heat exchanger with a blower in the above-ground part of the greenhouse, and connects both with a pump and piping. By circulating the water, during the day the heat retained in the relatively high temperature air inside the greenhouse is transferred to the circulating water from the ground heat exchanger, and the heat is absorbed from the circulating water to the heat storage equipment, thereby storing the solar heat during the day. At night, this heat-stored water is circulated and guided to the ground heat exchanger at the required speed, and the heat is absorbed into the greenhouse air to heat the greenhouse air at night. The present invention relates to a greenhouse heat storage heat exchange hot water heating method using water as a medium.

Conventionally, the air in the greenhouse was passed directly underground using a blower through relatively large diameter pipes buried underground, and from the air to the ground.
There is also a geothermal heat exchange greenhouse heating system that uses solar heat to exchange heat from underground to the air. The disadvantage is that water leaks and permeates from the pipes buried in the pipes.

Also, during the day, the air inside the greenhouse is cooled underground and becomes condensed water that accumulates in the pipes, and at night it evaporates, making the circulating air humid and making the greenhouse easily reach high temperatures. The heat stored in the ground during the day becomes the latent heat of moisture evaporation, and it is difficult to dissipate heat sufficiently considering the equipment, and as condensed water gradually accumulates, the stagnant water causes ventilation resistance in underground pipes. In addition, since a long pipe with a large diameter is used, there are disadvantages such as the fan power being reduced due to the ventilation resistance.

Furthermore, the thermal engineering properties of soil are influenced by natural conditions and vary widely, making its heat transfer and heat storage effects unreliable.

In addition, soil itself is a poor conductor of heat and has extremely poor heat transfer performance, requiring a large heat transfer area for heat exchange in low-temperature zones.

The present invention has been made to eliminate the above-mentioned drawbacks, and will be explained in detail below with reference to the drawings, which are one embodiment.

A water tank type heat storage facility 3 is provided underground 2 or above ground within the greenhouse 1, and air-to-water blowers 4 are installed at required locations within the greenhouse 1.
By installing an attached heat exchanger 5 and connecting both to a pump 6 with piping to circulate water, the heat retained in the relatively high temperature air inside the greenhouse 1 is circulated from the ground heat exchanger 5 during the day. The heat storage equipment 3 absorbs heat from the circulating water to store solar heat during the day, and at night, the stored water is guided as circulating water to the ground heat exchanger 5 at a required low speed. This is a method of space heating the greenhouse 1 at night by absorbing the heat into the air inside the greenhouse 1.

The water tank type heat storage equipment 3 is made up of a plurality of small water tanks arranged horizontally, and warm circulating water is supplied from the ground heat exchanger 5 through the first pipe 7 during the day. The connection from the first aquarium 3a that receives the water to the second aquarium 3b, third aquarium 3c, etc. is through a connecting pipe whose one end opens near the bottom of the first aquarium and the other end opens near the top of the next aquarium. 8, the warm circulating water during the day first enters the upper part of the first water tank such as the first water tank 3a, and the cold water at the lower part of the water tank 3a is transferred to the upper part of the next water tank 3b etc. Send it out through pipe 8,
The water is returned to the ground heat exchanger 5 from near the bottom of the last water tank 3n via a second pipe 9 equipped with a pump 6.

In this way, the return water that is sent from near the bottom of the last water tank 3n to the ground heat exchanger 5 by the second pipe 9 equipped with the pump 6, and then returned to the heat storage equipment via the first pipe 7 is heated by the ground heat. The heat exchanger 5 forcibly exchanges heat with the relatively high temperature air in the greenhouse 1 during the day by the blower 4, and the heat storage equipment 3 receives gradually lower temperature water from the first water tank 3a to the last water tank 3n. Water will be stored.

In addition, in order to prevent the hot water flowing back to the first water tank 3a from reaching a temperature below a certain limit value, the first piping 7
A water temperature detector 10 is provided at an appropriate location, and when the hot water flowing through the first pipe 7 falls below a certain value, the water flow control valve 12 provided in the first pipe 7 is throttled or closed via the controller 11. When the water flow control valve 12 is closed, the pump 6 is also stopped.

In addition, at night, the hot water stored in the heat storage equipment 3 passes through a hot water pipe 13 equipped with a pump 6 that opens at the top of the first water tank 3a, and then reaches the ground heat exchanger 5 near the ceiling in the greenhouse 1. Heat is exchanged with the cold air inside the greenhouse 1, and the air is returned to near the bottom of the last water tank 3n through a return pipe 14, thereby heating the inside of the greenhouse 1 at night.

When the air temperature inside the greenhouse 1 at night exceeds a certain value, the temperature is raised upwards inside the greenhouse 1 in order to prevent the hot water from the heat storage equipment 3 from being recirculated via the return pipe 14 without sufficient heat exchange. A detector 15 is provided, and when the temperature inside the greenhouse 1 exceeds a certain value, the flow rate control valve 17 provided in the return pipe 14 is throttled or closed via the controller 16 to effectively utilize the stored heat water. .

In addition, a return pipe 1 with a bypass valve 18 provided in the hot water pipe 13
9, the hot water flowing in the hot water pipe 13 is bypass-circulated through the return pipe 19, and the flow rate of hot water in the ground heat exchanger 5 is restricted during night heating to control the amount of heat radiation.

In addition, in winter, when the temperature inside the greenhouse 1 is low, the hot water from the heat storage equipment 3 is used during the day in the same way as at night as described above.
The hot water is returned from the hot water pipe 13 through the above ground heat exchanger 5 and the return pipe 14 to heat the inside of the greenhouse 1, but in order to prevent the temperature of the hot water from the heat storage equipment 3 from decreasing, a solar heat collector 20 is installed. The heated water is sent to the upper part of the first water tank 3a of the heat storage equipment 3 through the heating water pipe 22, and the heated water is sent to the upper part of the first water tank 3a of the heat storage equipment 3.
If the water is returned to the auxiliary heating means from near the bottom of the last water tank 3n via the switching valve 25 by the return water pipe 24 with the pump 23, cooling in the greenhouse 1 in winter can be prevented. I can do it.

As described above, according to the present invention, heat can be stored during the day with simple equipment, and heat can be radiated into the greenhouse at night.Moreover, since heat is exchanged between air and water, the greenhouse becomes humid. can be prevented.

Since the thermal engineering conditions for heat storage and heating are stabilized, stable and highly reliable heating can be performed.

Furthermore, the preferred method for nighttime heating is as follows:
With the power and method of the present invention, it is possible to easily control variable temperature by keeping the temperature relatively low in the middle of the night and heating it early.

In FIGS. 1 and 2, 26 and 27 are three-way cocks for circuit switching, and the three-way cocks 26 and 27 are mechanically (or electrically) connected to each other so as to be interlocked. 1st
Two three-way cocks 26 and 27 are operated simultaneously when the illustrated daytime circuit is switched to nighttime heating.

[Brief explanation of the drawing]

The drawings show an embodiment of the greenhouse heat storage heat exchange hot water heating method using water as a medium according to the present invention. Fig. 1 is a front view of piping showing the heat exchange state during the day, and Fig. 2 shows the heat exchange state during the night. FIG. 3 is a front view of the piping showing an exchange state; FIG. 3 is a front view of the piping showing a heat exchange state using an auxiliary heating means. 1 is a greenhouse, 2 is underground, 3 is a heat storage facility, 3a is the first water tank,
3b is the second tank, 3c is the third tank, 3n is the last tank,
4 is a blower, 5 is a heat exchanger, 6゜23 is a pump, 7 is a first pipe, 8 is a connecting pipe, 9 is a second pipe, 10 is a water temperature detector, 11 is a controller, 12 is a water flow control valve, 13 is a hot water pipe, 14 is a return pipe, 15 is a temperature sensor, 16 is a controller, 17 is a flow control valve, 18 is a bypass valve, 19 is a return pipe, 20 is a solar heat collector, 21 is a boiler, 22 is a heating water pipe , 24 is a reflux water pipe, 25 , 26 . 27 is a switching valve.

Claims (1)

[Claims] 1. In addition to providing a water tank-type heat storage facility, an air-to-water heat exchanger with a blower is installed above the ground in the greenhouse, and both are connected with a pump and piping to circulate water. Inside, the heat retained in the relatively high-temperature air inside the greenhouse is transferred to the circulating water through ground heat exchange, and the heat storage equipment absorbs heat from the circulating water to store solar heat during the day.At night, this stored water is A method of greenhouse heating in which circulating water is guided to an above-ground heat exchanger at a required low speed and the heat is absorbed into the air in the greenhouse to heat the space in the greenhouse at night, the water tank type heat storage equipment having a plurality of A number of small water tanks are arranged horizontally in parallel, and during the day, the first tank receives warm circulating water from the ground heat exchanger through the first pipe, and is connected to the second, third, and so on. The first aquarium is connected by a connecting pipe with one end near the bottom and the other end near the top of the next aquarium, so that the warm circulating water during the day is transferred to the first aquarium. The cold water that enters the top of the water tank and is at the bottom of the tank is sent to the top of the next tank through the connecting pipe, and is returned to the above-ground heat exchanger from near the bottom of the last tank via the second pipe. A greenhouse heat storage heat exchange hot water heating method using water as a medium. 2. The water medium according to claim 1, characterized in that the first pipe is provided with a water temperature detector that detects the water temperature and operates a water flow control valve via a controller so that the water temperature becomes a constant value. A greenhouse heat storage heat exchange hot water heating method. 3.In addition to installing an aquarium-type heat storage facility, an air-to-water heat exchanger with a blower is installed above the ground in the greenhouse, and both are connected with a pump and piping to circulate water. The heat retained in the high-temperature air is given to the circulating water from the ground heat exchanger, and the heat storage equipment absorbs heat from the circulating water to store solar heat during the day.At night, this heat-stored water is used as circulating water to be sent to the ground. Greenhouse heating system that heats the greenhouse at night by guiding the heat into a heat exchanger at the required low speed and absorbing the heat into the greenhouse air.
Method''''f''''-) T・The above-mentioned 0 water tank type 0 heat storage equipment is・
1. A plurality of small water tanks are installed horizontally in parallel, and during the day, the first water tank receives warm circulating water from the ground heat exchanger through the first pipe, and the second, third, and so on are connected to the water tanks. The connection is made by a connecting pipe that has one end near the bottom of the first aquarium and the other end opens near the top of the next aquarium, so that the warm circulating water during the day is first connected to the first aquarium, etc. The cold water that enters the upper part of the first water tank and the lower part of the water tank is sent to the upper part of the next water tank through the connecting pipe, and is sent to the above-ground heat exchanger from near the bottom of the last water tank via the second pipe. 7. Warm circulating water during the night is sent from the top of the first water tank to the heat exchanger via a hot water pipe with a pump, and this return water is passed through the return pipe to the last water tank. A greenhouse heat storage heat exchange hot water heating method using water as a medium, characterized in that the water is circulated near the bottom. 4 The return pipe is equipped with a water flow control valve that controls the flow of water to maintain the room temperature at a specified value via a controller using an air temperature detector that detects the room temperature inside the greenhouse. The greenhouse heat storage heat exchange hot water heating using water as a medium as set forth in claim 3, characterized in that the mixed water flowing therein is circulated within the hot water pipes, and the hot water flow rate is controlled during the night heating operation. Method.