JPS5922137B2 - Solar heating system for agricultural and fishery greenhouses - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating system for agricultural and fishery greenhouses using solar heat, which prevents the temperature and humidity inside the greenhouse from rising excessively during the daytime on sunny days, especially in winter. This paper relates to a solar heating system for agricultural and fishery greenhouses that improves thermal economy by storing surplus heat as hot water.

Due to recent changes in the eating habits in Japan, demand for so-called Western vegetables such as kirari, tomatoes, and lettuce is extremely strong throughout the year, and greenhouse cultivation of these vegetables is rapidly increasing.

In addition to this greenhouse for growing vegetables, there are greenhouses for drying tobacco, vegetables, etc., greenhouses for growing flowers, greenhouses for cultivating young fish, etc. (hereinafter, these greenhouses for agriculture and fisheries are simply referred to as "Us"). I'll decide.

) covers an area of tens of thousands of hectares nationwide, many of which require heating in the winter, and heavy oil is mainly used for heating, but the amount of oil used is hundreds of thousands of kilograms per year. It is said to reach liters.

As is well known, the price of petroleum products has recently skyrocketed, so attempts are being made to use solar heat to provide energy for heating the greenhouse.

An example of a house heating system using solar heat is shown in Figure 1 (
Systematic diagram).

That is, in the same figure, the solar heat collection spring A/1 is connected to the circulating water tank 6 by a pump 2, piping 3A, 3B, etc., and a radiator 5 is installed in the house 4.
The radiator 5 is connected to a circulating water tank 6 by a pump 2, piping 3C, 3D, and the like.

In winter, during the daytime on a sunny day, the valve 7A connecting the pump 2 and the piping 3A is opened, water is sent from the circulating water tank 6 to the heat collection panel 1, heated by solar heat, and then returned to the circulating water tank 6. Store.

At night, the valve 7A is closed, the valve 7B connecting the pump 2 and the pipe 3C is opened, and hot water is sent to the radiator 5 to heat the house.

In this conventional greenhouse heating system, even in winter, the temperature and humidity inside the greenhouse rise excessively during the daytime on a sunny day, which may actually impede the growth of agricultural products.

In such cases, conventionally, the air inside the house was exchanged with outside air to lower the temperature and humidity, but this resulted in the accumulated solar energy being wasted and dissipated into the outside air, which was not desirable from a thermoeconomic perspective. I couldn't say it.

The present invention improves the above-mentioned drawbacks of conventional greenhouse heating systems, and provides a heating system for agricultural and fishery greenhouses using solar heat, which has good thermal economy, requires a small installation area for heat collection panels, and has low equipment costs. is intended to provide.

The present invention achieves the above object by cooling and dehumidifying the overheated and overhumidified air in the house using water for installing heat collection panels through a heat exchanger.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a running system diagram showing an example of the solar heating system for agricultural and fishery greenhouses according to the present invention, and FIG. 3 is a diagram showing a cross section of a preheating chamber.

In both figures, a preheating chamber 8 is installed adjacent to the house 4, and a heat exchanger 9 is housed within the preheating chamber 8.

The inlet of the heat exchanger 90 is connected to the discharge port of the pump 2 via piping 3E and valve IC, and its outlet is connected to piping 3F.
, valve 7D, and piping 3A, and further connected to circulating water tank 6 through piping 3F, valve 7E, and piping 3D.

Further, the house 4 and the preheating chamber 8 are connected by a fan 10, a pipe 3G, and a pipe 3H.

A guide plate 8A is provided at the bottom of the preheating chamber 8, and a groove 8B is provided at the bottom.

The configuration of other parts is the same as that of the conventional greenhouse heating system described above, so a description thereof will be omitted.

In this example, if the temperature and humidity inside the greenhouse rise excessively during the daytime on a sunny day in winter, valve 7A,
When 7B and 7E are closed and 7C and 7D are opened and the pump 2 is operated, water in the circulating water tank 6 is pumped into the heat collector 1 via the heat exchanger 9.

At the same time, by operating the fan 10, the air inside the greenhouse 4 is sent into the preheating chamber 8, and the air inside the house and the water charged in the collector exchange heat, and the water poured into the collector is preheated.
Conversely, the air is cooled and dehumidified before returning to the greenhouse.

The water removed from the air drips from the guide plate 8A into the groove 8B and is discharged.

Also, when it is necessary to heat the house at night, etc., use valve 7.
A and 7D are closed, valves 7B, 7C, and 7E are opened to operate the pump 2, and at the same time, the fan 10 is operated again.

The hot water heats the Norus 4 by the radiator 5, and the air in the house by the heat exchanger 9, and then returns to the circulating water tank 6.

This system prevents excessive rises in temperature and humidity inside the greenhouse, which would impede the growth of crops, etc., and at the same time stores the heat in the circulating water tank as water, greatly improving the thermoeconomic efficiency of the entire system. can be increased and thus also reduce the number of heat collecting panels compared to conventional systems.

Since the heat exchanger 9 is used not only to preheat the water charged in the collector but also to heat the greenhouse, the heat transfer area of the radiator 5 in this system is larger than that in the conventional system. can be reduced to

Therefore, the increase in equipment costs due to the new installation of the preheating chamber 8 and the heat exchanger 9 is much smaller than the decrease in equipment costs due to the reduction in the number of heat collection panels and the heat transfer area of the radiator. In this case, equipment costs can be significantly reduced.

In summary, the present invention greatly reduces the equipment cost of a house heating system that effectively utilizes free solar heat, and enables a stable supply of agricultural and marine products even under unstable international situations such as the oil crisis. It is clear that there are certain things that dogs can do to contribute to the lives of the people.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing a conventional greenhouse heating system using solar heat; FIG. 3 is a sectional view of the preheating chamber. 1... Heat collection panel, 2... Pump, 3
A, 3B. 3C, 3D, 3E, 3F, 3G, 3H...Piping, 4...House, 5...Radiator, 6.
...Circulating water tank, 7A, 7B, 7C, 7D, 7
E... Valve, 8... Preheating chamber, 8A.
...Guide plate, 8B...Groove, 9...
...Heat exchanger, 10...Tsun.

Claims (1)

[Claims] 1. Heating of greenhouses for agriculture and fisheries using solar heat, in which warm water obtained by passing water through solar heat collection panels during the daytime on sunny days in winter is heated by passing it through radiators installed in the greenhouse at night, etc. In the greenhouse system, a preheating chamber housing a heat exchanger is provided adjacent to the greenhouse, and the heat exchanger preheats water for filling the heat collection springs with the air inside the greenhouse. Heating system for agricultural and fishing deep chambers.