JPH0569482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioning system for a greenhouse that combines an air conditioner and a heat storage device.

[Conventional technology]

Examples of greenhouse air conditioning systems that combine an air conditioner and a heat storage device are known, such as those described in Japanese Patent Application Laid-Open Nos. 57-138326 and 1987-146526.

Also, as described in Japanese Patent Application Laid-open No. 59-93134,
It is equipped with a heat storage section, a heat exchanger, a heat medium flow path, a bypass heat medium flow path, a fan, and an on-off valve, and the on-off valve is switched.
A heat storage type air-conditioning device is disclosed that performs heat storage operation, combined operation, and normal operation.

[Problem to be solved by the invention]

With such prior art, it is difficult to operate the air conditioner independently, it is impossible to operate the air conditioner and the heat storage device together, and the circulation of air in the greenhouse is insufficient, making it impossible to effectively store excess heat. There are other problems.

The purpose of the present invention is to enable independent operation of an air conditioner, also enable combined operation of an air conditioner and a heat storage device, and also to improve circulation of air in a greenhouse so that surplus heat can be effectively stored. The aim is to improve.

[Means to solve the problem]

In order to achieve the above object, the greenhouse air conditioning system of the present invention is a greenhouse air conditioning system that combines a heat storage device and an air conditioning device. A bypass duct is provided to connect the exhaust ducts, and a condenser or evaporator that constitutes an air conditioner is provided in this bypass duct, and a heat storage device is provided between the bypass duct and the intake duct after exiting the condenser or evaporator. A duct is provided, and a semi-closable switching valve is provided at the joint between the intake duct and the bypass duct, and a switching valve is provided at the joint between the intake duct and the heat storage duct and the joint between the exhaust duct and the bypass duct. In addition to storing heat and cold in a heat storage capsule in a heat storage device, the system also performs heating and cooling using only an air conditioner and heating and cooling using a combination of a heat storage device and an air conditioner.

[Effect]

With the above configuration, when the fan is rotated, air circulates within the greenhouse in the following order: the intake duct, around the heat storage capsule in the heat storage device, and the exhaust duct. As a result, the heat retained in the air is stored in the evaporative material inside the heat storage capsule. When operating an air conditioner to store heat, the fan rotates to circulate the air inside the greenhouse through the intake duct, the condenser, the heat storage duct, around the capsule, and the exhaust duct, and the air introduced into the intake duct is The temperature rises while passing through the condenser, promoting heat storage in the heat storage material inside the heat storage capsule. At this time, even when the air conditioner is operated to store heat, the air in the greenhouse can pass through the heat exchange part and the heat storage part, so the surplus heat in the greenhouse can be effectively used.

Furthermore, when performing an independent heating operation using only the air conditioner, it can be performed while the heat held in the heat storage material in the heat storage capsule is preserved. In addition, when operating in combination, one air receives heat from the condenser and the other air receives heat from the heat storage capsule, and they are combined at the exhaust duct to perform heating operation.

〔Example〕

FIG. 1 shows the configuration of the greenhouse air conditioning system of the present invention and the operating method during heat storage.

A greenhouse 30 is installed on the ground 32. The greenhouse 30 consists of a ceiling film 1 and side films 2 made of vinyl or the like. An air conditioner 40 and a heat storage device 3 are arranged inside the greenhouse 3. The heat storage device 3 houses a large number of heat storage capsules 4 containing a heat storage material (sensible heat storage material such as water or latent heat storage material such as calcium chloride). The heat storage device 3 is also provided with an intake duct 6 and an exhaust duct 5, and the air 31 in the greenhouse 1 is supplied to the air intake duct 6 and the capsules in the heat storage device 3 by a fan 7 provided in the intake duct 6. 4 and around the exhaust duct 5 in this order. The air conditioner 40 also includes an evaporator 9, a compressor 8, a condenser 11, an expansion valve 10, and a connecting pipe connecting them.
A condenser 11 is provided in the air intake duct 6, and an evaporator 9 is provided outside the air 31 in the greenhouse. This air conditioner 40 contains a heat medium (such as fluorocarbons), which is adiabatically compressed by the compressor 8, enters the condenser 11, and then expands adiabatically while passing through the expansion valve 10. and then enters the evaporator 9 and then returns to the compressor 8. As a result, the condenser 11 becomes high in temperature due to adiabatic compression of the heat medium, and the evaporator 9 becomes low in temperature due to adiabatic expansion.

A bypass duct 12 connecting the intake duct 6 and the exhaust duct 5 is provided as shown in the figure, and a condenser 11 of the air conditioner 40 is provided inside the bypass duct 12.

Reference numeral 13 denotes a connecting duct that connects the bypass duct 12 and the intake duct 6, and 15 denotes a connecting duct that connects the bypass duct 12 and the exhaust duct 5. Further, a heat storage duct 14 is provided between the bypass duct 12 after exiting the condenser 11 and the intake duct 6. In addition, the coupling duct 13, the heat storage duct 14, and the intake duct 6 are connected to a switching valve 16, respectively.
17, and a switching valve 18 is provided at the joint between the joint duct 15 and the exhaust duct 5. During the daytime in winter, during heat storage operation without using the air conditioner 40, the switching valves 16, 17, and 18 are set horizontally as shown. When the fan 7 is rotated, the air 31 in the greenhouse 30 flows around the intake duct 6, the heat storage capsule 4 in the heat storage device 3, and
Exhaust duct 5 is released. This allows air 3
The retained heat of 1 is stored in the evaporative material inside the heat storage capsule 4. To heat the crops by extracting the heat in the heat storage material at night, the fan 7 may be rotated to flow the air 31 in the direction of the solid arrow, as in the case of heat storage.

During cloudy and rainy weather in winter, when the temperature of the air 31 in the greenhouse 30 is low, the air conditioner 40 is operated to promote heat storage, and in this case, as shown in FIG. 17 to the vertical position. Due to the rotation of the fan 7, the air 31 in the greenhouse 30 is transferred to the suction duct 6 and the coupling duct 1 as shown by solid arrows.
3. It circulates in the order of the condenser 11, the heat storage duct 14, around the capsule 4, and the exhaust duct 5. Intake duct 6
The temperature of the air 31 introduced into the heat storage capsule 4 increases while passing through the condenser 11, and heat storage in the heat storage material within the heat storage capsule 4 is promoted. At this time, since the air 31 inside the greenhouse can pass through the heat exchange section and the heat storage section, the surplus heat inside the greenhouse can be effectively utilized. The heat stored in this way is radiated at night,
To heat the crops, the air may be circulated in the order of the intake duct 6, around the heat storage capsule 4, and the exhaust duct 5 as shown by the solid arrow in FIG.

FIG. 3 shows a case of independent heating operation using only the air conditioner 40. In this case, the switching valve 16 is lowered vertically, the switching valve 17 is set horizontally, and the switching valve 18 is moved 180 degrees lower than in the case of FIG.
Rotate it once and set it horizontally. The air 31 introduced into the intake duct 6 by the rotation of the fan 7 is transferred to the coupling duct 13, the condenser 11, and the bypass duct 1.
2, it circulates in the order of the coupling duct 15 and the exhaust duct 5. Only the heat generated from the condenser 11 is transmitted to the air 31, and the heat held in the heat storage material in the heat storage capsule 4 is stored as is.

FIG. 4 shows a case where heating is performed using both the heat generated from the condenser 11 of the air conditioner 40 and the heat generated from the heat storage capsule 4.
In this case, the switching valve 16 is half-closed as shown, and the switching valves 17 and 18 are set in the same position as in FIG. 3. A part of the air 31 introduced into the intake duct 6 enters the coupling duct 13,
The remaining part goes straight through the intake duct 6 and enters the heat storage capsule 4.
be introduced to the surrounding area. As a result, one air receives heat from the condenser 11 and the other air receives heat from the heat storage capsule 4, and the two are combined in the exhaust duct 5 and used for heating the crops.

FIG. 5 shows another embodiment. This is so that the air introduced into the intake duct 6 passes around the capsule 4 and then is discharged into the greenhouse 30 through the condenser 11. For this reason, an auxiliary duct 20 with a switching valve 19 is provided at the boundary between the coupling duct 13 and the bypass 12. As shown,
When the switching valves 16, 17, and 19 are set horizontally and the switching valve 18 is lowered vertically, the rotation of the fan 7 causes the air 31 to flow through the intake duct 6, around the capsule 4,
Coupling duct 15, bypass duct 12, condenser 1
1. It circulates through the auxiliary duct 20 in this order. In this way, the air 31 is preheated while passing around the heat storage capsule 4, is heated in the condenser 11, and returns to the greenhouse 30. As a result, the temperature of the air discharged from the auxiliary duct 20 tends to be high, and the heating effect is significantly enhanced. Figure 2, Figure 3,
When returning to the operation shown in FIG. 4, the switching valve 19 may be set vertically.

FIG. 6 shows another embodiment. This is done by raising the inlet part of the intake duct 6 as shown in the figure, and
2, and the high temperature air 3 in the upper part of the greenhouse 30
1 is made easier to inhale. Also, the exhaust duct 5
A switching valve 21 is provided to branch into two directions, one of which is placed along the ground 32 to form a ground-side exhaust duct 5', and the other is raised upwards of the greenhouse 30 as shown in the figure to provide upper exhaust air. Making duct 23. During heat storage, the switching valve 21 is vertically lowered as shown in the figure so that air returns to the upper part of the greenhouse 30 through the upper exhaust duct 23. In this way, during heat storage, the heat held by the high-temperature air 31 in the upper layer is efficiently absorbed by the heat storage material in the heat storage capsule 4. During nighttime heating, the switching valve 21 is set horizontally, and the air that has passed through the exhaust duct 5 is discharged to the vicinity of the earth 32 through the earth side exhaust duct 5', thereby effectively heating the crops. Further, in this embodiment, an inlet duct 24 and an outlet duct 25 are provided in the evaporator 9 section. and inlet duct 2
A startup duct 28 with a switching valve 26 is provided at the 4th section, and a startup duct 29 with a switching valve 27 is provided at the 25th section of the outlet duct.
Opening ends 28' and 29' of 8 and 29 are exposed to the outside of the ceiling film 1 as shown in the figure. In this case, when there is a risk that the crops may be harmed by excessive cooling due to the cold air generated in the evaporator 9, the switching valves 26 and 27 are lowered as shown in the figure, and outside air is brought into the duct 28 and inlet duct 24. , the evaporator 9, the outlet duct 25, and the rising duct 29 in this order, and the cold air generated in the evaporator 9 is disposed of outside.
If the switching valves 26 and 27 are set horizontally, the cold heat of the evaporator 9 will be discharged into the greenhouse 30 as before. In this case, it is preferable to provide a fan (not shown) near the evaporator 9. In this embodiment, the rising ducts 28 and 29 may be arranged horizontally so that their open ends 28' and 29' face the side film 2. In other words, any part of the greenhouse 30 may be used as long as it is easily connected to the outside air.

In the above description, the heat storage and heating operation in winter have been particularly described, but the present invention can also be used for cold storage and air conditioning in the summer. In this case, the air conditioner 40 operates in a reverse cycle, using the condenser 11 as a condenser and the evaporator 9 as a condenser.

〔Effect of the invention〕

As explained above, according to the present invention, (1) the air conditioner can be operated independently, but this can be done while preserving the heat held in the heat storage material; (2) the air conditioner can be operated independently; It is possible to operate the device and the heat storage device together, but the air on one side receives heat from the condenser and the other air receives heat from the heat storage material and can be combined in the exhaust duct. (3) Circulation of air within the temperature This makes it possible to effectively store surplus heat, making it convenient for practical use.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the greenhouse air conditioning system of the present invention, showing the operating method during heat storage or heating, and Fig. 2 shows the heat storage driving the air conditioner of the greenhouse air conditioning system of the present invention. Fig. 3 shows a heating method of the greenhouse air conditioning system of the present invention by operating the air conditioner alone, and Fig. 4 shows the heating method of the greenhouse air conditioning system of the present invention using the heat storage device and the air conditioner. This shows a heating operation method using a conditioning device, and FIGS. 5 and 6 show other embodiments of the greenhouse air conditioning device of the present invention. 1...Ceiling film, 2...Side film, 3
... Heat storage device, 4 ... Heat storage capsule, 5 ... Exhaust duct, 5' ... Ground side exhaust duct, 6 ... Intake duct, 7 ... Fan, 8 ... Compressor, 9 ... Evaporator or condenser device, 10...expansion valve, 11...condenser or evaporator, 12...bypass duct, 1
3, 15... Combined duct, 14... Heat storage duct,
16, 17, 18, 19, 21...Switching valve, 20
... Auxiliary duct, 22 ... Standing part, 23 ... Upper exhaust duct, 24 ... Inlet duct, 25 ... Outlet duct, 26, 27 ... Switching valve, 28, 29 ...
...Starting duct, 30...Greenhouse, 31...Air,
32...Earth, 40...Air conditioner.

Claims (1)

[Scope of Claims] 1. In an air conditioning system for a greenhouse that combines a heat storage device and an air conditioner, a bypass duct is provided that connects an air intake duct from the greenhouse equipped with a fan of the heat storage device and an exhaust duct to the greenhouse; A condenser or evaporator constituting an air conditioner is provided in the bypass duct, and a heat storage duct is provided between the intake duct and the bypass duct after exiting the condenser or evaporator, and the intake duct and the bypass duct are connected to each other. A semi-closable switching valve is provided at the joint between the intake duct and the heat storage duct, and a switching valve is provided at the joint between the intake duct and the heat storage duct and the joint between the exhaust duct and the bypass duct.
An air conditioning system for a greenhouse characterized by storing heat and cold in a heat storage capsule in a heat storage device, and also performing heating and cooling using only an air conditioner and heating and cooling using a combination of a heat storage device and an air conditioner. 2. The bypass duct is provided with an auxiliary duct with a switching valve that opens one end into the greenhouse, so that the cold air or hot air that has passed around the heat storage capsule passes through an evaporator or a condenser provided in the bypass duct,
This accelerates the temperature drop or rise of the passing air, and then it is released from the opening of the auxiliary duct,
The greenhouse air conditioning system according to claim 1, which has an enhanced heating effect or cooling effect. 3. Raise the inlet of the intake duct toward the top of the greenhouse, and install a switching valve at the outlet of the exhaust duct to branch into two directions, and place one side along the ground to connect the ground-side exhaust duct. 3. The air conditioning system for a greenhouse according to claim 1 or 2, wherein the air conditioning system is made of a single duct and the other end is raised toward the top of the greenhouse to form an upper exhaust duct. 4 An inlet duct and an outlet duct are provided in the evaporator or condenser provided outside the bypass duct, and a stand-up duct with a switching valve is provided in each of these inlet duct and outlet duct, and their open ends are placed outside the ceiling film. An air conditioning system for a greenhouse according to claim 1 or 2, which is designed to improve efficiency.