JPS6026231A - Method of heating greenhouse - Google Patents

Abstract

PURPOSE:To make it possible to heat the greenhouse to a desired temperature for a long period of time by automatically driving a fan so as to blow air and radiate the heat accumulated in the ground when the room temperature is lowered from a predetermined value, and automatically driving pumps when the flowing air and heat radiation are not sufficient, so as to introduce the heat medium within a tank into a radiator and to radiate the heat of the heat medium. CONSTITUTION:A tank 5 for storing the heat medium, two pumps 6 and 7 for collecting heat and radiating heat and a hot air heating unit 8 are disposed. A heat radiating pipe 10 having fins 9 projecting in the entire length of the outer surface is arranged along an outer wall 11. When both ends of the heat radiating pipe 10 are connected to the tank 5 and a heat radiating pump 7 is driven, the heat medium circulates within the heat radiating pipe 10. Further, the tank 5 is connected to a collector 4 through a feed pipe 12 and a return pipe 13. Further, when a fan 17 is driven, the heat stored in the ground 14 is blown into the greenhouse 1 through a hot air blow-out pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating method for heating a greenhouse by using solar heat stored during the day when the room temperature is low, such as at night.

Conventionally, a collector was installed on the roof of the greenhouse and a heat exchanger was installed inside the greenhouse, and the heat medium such as water heated in the collector by solar heat was simply stored in the heat exchanger. This prevented the room temperature from dropping. However, with this method, it was not possible to maintain the desired temperature in the greenhouse for a long period of time.

An object of the present invention is to provide a heating method that can efficiently radiate solar heat accumulated during the day as the room temperature decreases, and can heat the inside of a greenhouse to a desired temperature over a long period of time.

The present invention stores the heat inside the greenhouse heated by heat in the ground, and also stores the heat medium such as water in the collector heated by solar heat in a tank to store the heat, thereby reducing the temperature inside the greenhouse. When the temperature sensor detects that the room temperature has dropped below a certain set value, the fan is automatically activated to radiate the heat stored in the ground. It is automatically driven to send the heat medium in the tank to the radiator and radiate the heat from the heat medium.

An embodiment of the present invention will be explained in detail below with reference to the drawings.
do.

In FIG. 1, greenhouse l is 8i! 2 is a transparent board-clad structure made of glass plate or the like, and a vacuum tube type collector 4 is installed on the main building 3 on the south side of the roof 2, and the indoor space is directly heated by solar heat during the day. .

Inside the greenhouse 1, as shown in FIGS. 2 and 3, there is a tank 5 for storing a heat medium such as water. Two pumps, one for heat collection and one for heat radiation 6.
7 and a hot air heater 8 are arranged, and a heat dissipation pipe 1° having fins 9 projecting from the entire length of the outer surface is installed along the outer wall 11. Both ends of the heat radiation pipe 100 are connected to the tank 5, and when the heat radiation pump 7 is driven, the heat medium flows into the heat radiation pipe lo.
In addition, the tank 5 and the collector 4 are connected via a feed pipe 12 and a return pipe 13.
When the heat collection pump 6 is driven, the heat medium circulates between the tank 5 and the collector 4.

The ground 14 itself on the indoor side of the greenhouse 1 is a soil heat storage layer, and an air suction bit 15 is provided in the center, and hot air blowing pipes 16 made of hard Ifa vinyl are buried radially from this bit 15. ing. A fan 17 is arranged inside the pit 15, and when the fan 17 is driven, the ground 1
The heat stored in the greenhouse 1 passes through the hot air blowing pipe 16.
The heat is radiated to 17i.

The temperature of the heat medium in the tank 5 is detected simultaneously by three temperature sensors 18° 19.20 for tank temperature detection, stock number measurement, and heat radiation control, and the temperature of the heat medium in the trench collector 4 is detected at the same time as the collector temperature. Once detected by the sensor 21,
The temperature inside the warmer 1 is detected by a temperature sensor 22 for detecting room temperature. The upper and lower limits of the heat medium reservoir in the tank 5 are detected by the liquid level sensor 23.

Tank temperature detection temperature sensor 18 and protection temperature sensor 1
9 and the liquid level switch 23 are input to the heat collection controller 24, and the electric outputs of the heat radiation control temperature sensor 20 and the room temperature detection temperature sensor 22 are input to the heat radiation controller 25.

The pal 727 in the supply pipe 26 connected to the tank 5 and the heat collection pump 6 are controlled by the heat collection controller 24, and the heat radiation pump 7, the hot air heater 8, the fan 17, and the heat radiation controller 25, and the control method will be explained next with reference to the flowcharts of FIGS. 4 and 5. In addition,
4 shows the control steps of the heat collection controller 24, and FIG. 5 shows the control steps of the heat radiation controller 25.

When the heat collection controller 24 is activated, the protective temperature sensor 1 is first activated.
Judgment as to whether or not the detected temperature 'rp in step 9 is below the upper limit set temperature t, which is close to the boiling temperature of the heat medium (step 1 in Fig. 4).
00) is performed. If the detected temperature of the collector temperature detection sensor 21 is below T1. The difference TH-TL between l and the detected temperature TL of the tank temperature detection sensor 18 is the set value t2.
A determination is made as to whether or not this is the case (step 101). Further, if the temperature difference between the heat medium in the collector 4 and the heat medium in the tank 5 is 18 or more, a timer is activated (step 10:1'), and the heat collection pump 102 is started after the set time delay. (Step 102), the heat medium circulates between the tank 5 and the collector 4, and the heat medium heated by solar heat in the collector 4 enters the tank 5, thereby storing heat. In step 100, Tp is 18
When that happens, tsu'! When the temperature of the heat medium in the υ tank 5 approaches the boiling point, and when TH-TL falls below t in step 101, a timer is activated (step 103) to collect heat after a set time delay. pump 104 is stopped (step 104).

Therefore, even if the amount of solar radiation is sufficient, the heat medium in the tank 5 is kept below the boiling temperature, and when the temperature difference with the heat medium in the trench collector 4 becomes 52 or more, it is automatically sent to the collector 4. and heated by solar heat.

Note that the start and stop of the heat collection pump 6 is delayed by a timer in order to prevent the pump 6 from being turned on and off frequently due to sudden changes in the amount of solar radiation. In addition, keeping the heat medium in the tank 5 below the boiling temperature is
This is to prevent leakage and to maintain the pump 6.

On the other hand, when the heat radiation controller 25 is activated, first, the detected temperature T11 of the room temperature detection sensor 22 is set to the heat radiation setting (i/ff1t).

A determination is made as to whether it is equal to or less than (step 200 in FIG. 5), and if YES, the fan 17 is started (step 201), and the heat stored in the ground 14 is blown and radiated into the greenhouse 1, providing heating. be done.

If the ventilation heat radiation is insufficient for heating m, it is determined whether TR is 1 s or less (step 202), and then it is determined whether the detected temperature Ts of the heat radiation control temperature sensor 20 is equal to or higher than the set value t4 (step 203). A determination is made as to whether the temperature of the heat medium in the tank 5 is sufficient for heating, and if YES, the heat radiation pump 7 is started, and the heat medium in the tank 5 circulates through the heat radiation pipe 10 to radiate heat. If this is still insufficient, it is again determined whether TR is t or less (step 205), and if YES, the hot air heater 8, which is an auxiliary heat source, is started (step 206). When the temperature inside the greenhouse 1 does not rise above the low temperature set value t5 even after heating with the hot air heater 8, that is, when NO in step 207, the buzzer is activated (
Step 208).

If the answer is No in step 200, the fan 17 is stopped (step 209), and if the answer is No in step 203, the heat radiation pump 7 is stopped. (Step 210).

Therefore, when the room temperature drops at night or the like, the inside of the greenhouse 1 is automatically heated so that the temperature is maintained between the heat setting value t3 and the low temperature setting value t11.

In the above embodiment, the heat of the heat medium is radiated by the eve 10, but it may be radiated by another radiator.

According to the present invention as described in detail above, the solar heat accumulated during the day can be efficiently radiated as the room temperature decreases, so that the inside of the greenhouse can be heated to υ91 temperature for a long time.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a greenhouse to which the present invention is applied, Fig. 2 is a plan view of the interior of the greenhouse, Fig. 3 is an explanatory diagram showing the entire system, and Fig. 4 is an illustration of heat collection control. 70-Tayat,
FIG. 5 is a flowchart for explaining heat radiation control. 1... Greenhouse, 4.9. Kojikta, 5... Tank, 2
2...Temperature sensor for room temperature detection, 17...Fan, 2
0... Temperature sensor for heat radiation control, 7... Heat radiation pump, 10... Heat radiation pipe (radiator). Patent applicant Hazama Co., Ltd. Agent Patent attorney Hara 1) Shinichi

Claims (1)

[Claims] L A temperature sensor that detects the temperature inside the greenhouse by storing the heat in the greenhouse heated by solar heat underground, and by storing the heat medium such as water in the collector heated by solar heat in a tank. When the detected temperature is below the set value, the fan is automatically activated to blow and radiate the heat stored in the ground into the greenhouse. If the temperature detected by the temperature sensor that detects the temperature of the heat medium in the tank is above a predetermined value, one pump is automatically driven to send the heat medium in the tank to the radiator placed in the greenhouse. A greenhouse heating method characterized by radiating heat.