CN204084686U - For the pad and fan cooling system in greenhouse - Google Patents

Abstract

The wet curtain fan cooling system for greenhouse disclosed by the utility model includes a high-pressure spray cooling system arranged on the upper part of the plant growth area in the greenhouse and a wet curtain direct evaporation cooling system arranged in the air conditioning area in front of the plant growth area in the greenhouse . The wet curtain fan cooling system of the utility model transforms the traditional wet curtain fan structure, separates the cooling and humidification function from the ventilation function, combines the high-pressure spray system with the wet curtain direct evaporative cooling system, and opens different functional sections reasonably , to control the opening time of the two systems to meet the needs of different working conditions in summer and transitional seasons.

Description

Wet curtain fan cooling system for greenhouse

technical field

The utility model belongs to the technical field of air-conditioning and refrigeration equipment, and in particular relates to a wet curtain fan cooling system for a greenhouse.

Background technique

In recent years, with the continuous efforts of scientific research personnel in our country and the vigorous promotion of the country, the cooling system of wet curtain fans has been applied to places such as modern agricultural greenhouses, and has achieved good economic and technological benefits.

In engineering practice, the cooling system of the wet curtain fan will also have some operational problems. On the one hand, many of the existing wet curtain fan cooling systems in my country that are relatively mature in operation are imported technologies from abroad. Take the traditional Venlo greenhouse as an example. The Venlo greenhouse was originally imported from the Netherlands. Because the Netherlands has a maritime climate, the outdoor temperature in summer is basically Keep it below 30°C, so the indoor temperature is basically kept below 35°C; however, in many areas of our country, the average outdoor temperature in summer is above 35°C, and the indoor temperature will rise sharply. Therefore, under the hot climate conditions in the north, it is often necessary to run the cooling system all day long, which increases the energy consumption of the greenhouse in summer to a certain extent; There are more suspended solids. With the operation of the cooling system of the wet curtain fan, the air dust filtered in the wet curtain will increase, which will affect the cooling efficiency of the wet curtain and the quality of circulating water. For this reason, it is necessary to transform and optimize the structure of the original wet curtain fan according to my country's national conditions, and to explore a greenhouse cooling system suitable for my country's climatic conditions; at the same time, as the distance between the wet curtain and the fan increases, the airflow direction The upper temperature gradient will become larger and larger, making the temperature of the space near the fan side rise faster, which is not conducive to the growth of plants. Since the high-pressure spray cooling system has the advantages of obvious cooling effect and flexible space layout, it is considered to combine the above two cooling systems together, and arrange a high-pressure spray cooling system in the upper space near the fan side to reduce the temperature in the high-temperature area. The cooling "relay" of the airflow through the two cooling systems can increase the design size of the traditional building width and alleviate the problem of excessive temperature gradients.

Utility model content

The purpose of this utility model is to provide a wet curtain fan cooling system for greenhouses, which separates the cooling and humidification function from the ventilation function, and controls the opening time of the two systems by rationally opening different functional sections to meet summer and transitional seasons The needs of different working conditions.

The technical solution adopted by the utility model is that the wet curtain fan cooling system used in the greenhouse includes a high-pressure spray cooling system arranged on the upper part of the plant growth area in the greenhouse and a humidifier installed in the air conditioning area in front of the plant growth area in the greenhouse. Curtain direct evaporative cooling system.

The utility model is also characterized in that,

At least one wet curtain direct evaporative cooling system is provided; at least one high-pressure spray cooling system is provided.

A sunshade net is arranged horizontally above the wet curtain direct evaporative cooling system and the high pressure spray cooling system.

The wet curtain direct evaporative cooling system includes parallel and opposite indoor wet curtain walls, a second spray device is installed above each indoor wet curtain wall, and a circulating water pool sealed in the soil is arranged under the indoor wet curtain wall. Each second spraying device is respectively connected to the circulating water pool through the second circulating water pipe;

The first air passage is formed between the two indoor cooling curtain walls according to the direction of air flow after entering. The outside of the greenhouse wall corresponding to the air inlet side of the first air passage is provided with an outdoor cooling curtain wall, and the upper part of the outdoor cooling curtain wall is provided with a second A spraying device, the first spraying device is connected to the circulating pool through the first circulating water pipe, and the air outlet side of the first air duct corresponds to the plant growth area in the greenhouse;

A fresh air duct is formed between each indoor wet curtain wall and the wall on the same side of the greenhouse, and the greenhouse wall corresponding to the air inlet side of each fresh air duct is provided with an air inlet window, and the air outlet side of each fresh air duct corresponds to Greenhouse plant growth area;

Both the air outlet side of the first air duct and the air outlet side of the fresh air duct are provided with intake fans.

The first circulating water pipe is provided with a first circulating water pump, and the connection between the first circulating water pipe and the circulating pool is provided with a first water quality filter;

A second circulating water pump is arranged on the second circulating water pipe, and a second water quality filter is arranged at the connection between the second circulating water pipe and the circulating pool.

The intake fan is a frequency conversion fan.

The high-pressure spray cooling system is composed of multiple spray rows arranged in parallel. Each spray row and the corresponding seedbed below form a parallel second air duct according to the direction of air flow. The outside of the air outlet side of each second air duct All are equipped with exhaust fans.

A plurality of spray rows are arranged equidistantly.

The exhaust fan is a frequency conversion fan.

The beneficial effects of the utility model are:

1. The wet curtain fan cooling system of the present utility model transforms the traditional outdoor wet curtain wall structure into one part of the wet curtain wall located outdoors and the other part located indoors. The outdoor wet curtain wall has the functions of humidifying, cooling and dust removal for fresh air. Function, to protect the indoor wet curtain wall, which can be replaced frequently according to actual needs; the indoor wet curtain wall continues to process the air from the outdoor wet curtain wall, which has the effect of further humidifying and cooling, and ensures heat exchange due to protection Efficiency, extended replacement cycle.

2. The wet curtain fan cooling system of the present utility model reforms the original wet curtain fan structure, and separates the cooling, humidification and ventilation functions of the wet curtain fan cooling system; The corresponding speed is adjusted according to the actual situation, which reduces the energy consumption of the system.

3. In the wet curtain fan cooling system of the utility model, the circulating water pool adopts a closed form and is buried under the shallow ground surface, which not only saves the occupied area, but also fully exchanges heat between the water in the circulating pool and the soil on the shallow ground surface, reducing The circulating water temperature improves the heat and moisture exchange effect between water and air.

4. In the wet curtain fan cooling system of the present utility model, multiple inlet fans are arranged in parallel, and the air supply mode of front air supply is adopted, which can make the air flow uniform, not only can control the greenhouse partition, but also flexibly control according to the needs The number of fans running, independent control of key air cooling parameters such as "heat and moisture exchange coefficient" between water and air, "wet curtain surface wind speed", and frequency conversion adjustment of the inlet fan unit, so as to achieve better energy-saving effect; Each exhaust fan can independently control the non-key parameters of air cooling such as "indoor air volume" and "indoor wind speed". The inlet fan and exhaust fan can operate independently, making the indoor environment control process more flexible.

5. In the wet curtain fan cooling system of the present utility model, the high-pressure sprayer and the wet curtain direct evaporative cooler are arranged inside the greenhouse, and the sunshade net is arranged on it, which can not only reduce the interference of the external airflow on the heat and moisture exchange process between the air and water , can also reduce the impact of external solar radiation on the high temperature radiation of the heat transfer medium, and ensure the efficient heat transfer process.

6. Since the indoor wet curtain wall is protected by the outdoor wet curtain wall and arranged indoors, there is no need to set up sunshade parts for protection in the air inlet direction of the indoor wet curtain wall, which reduces the air inlet resistance and reduces system energy consumption.

Description of drawings

Fig. 1 is the structural representation of the cooling system of the wet curtain fan of the utility model;

Fig. 2 is a structural schematic diagram of the spray system in the cooling system of the wet curtain fan of the utility model;

Fig. 3 is a schematic diagram of the ventilation working conditions of the wet curtain fan cooling system of the present invention.

In the figure, 1. Air inlet window, 2. Outdoor wet curtain wall, 3. Indoor wet curtain wall, 4. Inlet fan, 5. Plant growth area in the greenhouse, 6. Exhaust fan, 7. Sunshade net, 8. Spray exhaust , 9. Seedbed, 10. Circulating pool, 11. The first spraying device, 12. The second spraying device, 13. The second circulating water pipe, 14. The first circulating water pipe, 15. The first circulating water pump, 16. The first A water quality filter, 17. a second circulating water pump, and 18. a second water quality filter.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model is used for the cooling system of the wet curtain fan in the greenhouse. Its structure is shown in Figure 1, including a wet curtain direct evaporative cooling system and a high-pressure spray cooling system arranged in the greenhouse. The high-pressure spray cooling system is arranged in the greenhouse for plant growth. In the upper part of zone 5, the wet curtain direct evaporative cooling system is arranged in the air conditioning zone in front of the plant growth zone 5 in the greenhouse.

At least one wet curtain direct evaporative cooling system is provided; at least one high-pressure spray cooling system is provided.

As shown in Figure 2, a sunshade net 7 is horizontally arranged above the wet curtain direct evaporative cooling system and the high-pressure spray cooling system.

The wet curtain direct evaporative cooling system, Figure 1 and Figure 2 shows an embodiment structure, including two parallel and opposite indoor wet curtain walls 3, each indoor wet curtain wall 3 is provided with a second Spraying device 12, a circulating water pool 10 is arranged under the soil below the two indoor wet curtain walls 3, and two second spraying devices 12 are respectively connected to the circulating water pool 10 through the second circulating water pipe 13; the two indoor wet curtain walls 3 The first air duct is formed according to the direction in which the air flows after entering. The outside of the greenhouse wall corresponding to the air inlet end of the first air duct is vertically provided with an outdoor wet curtain wall 2, and the top of the outdoor wet curtain wall 2 is horizontally provided with a first air duct. Spraying device 11, the first spraying device 11 is connected with the circulating pool 10 by the first circulating water pipe 14, and the air outlet side of the first air duct corresponds to the plant growth area 5 in the greenhouse; each indoor wet curtain wall 3 is the same as that in the greenhouse. A fresh air duct is formed between the walls on the side, and the greenhouse wall corresponding to the air inlet side of each fresh air duct is provided with an air inlet window 1, and the air outlet side of each fresh air duct corresponds to the plant growth area 5 in the greenhouse; the first Both the air outlet side of the air duct and the air outlet side of the fresh air duct are provided with an inlet fan 4, and a plurality of inlet fans 4 are arranged in parallel. The air inlet fan 4 is preferably a variable frequency fan.

Each indoor wet curtain wall 3 is perpendicular to the ground; two fresh air ducts are respectively located on both sides of the first air duct, and both are parallel to the first air duct.

The first circulating water pipe 14 is provided with a first circulating water pump 15, and the connection between the first circulating water pipe 14 and the circulating pool 10 is provided with a first water filter 16; the second circulating water pipe 13 is provided with a second circulating water pump 17, the second A second water quality filter 18 is provided at the connection between the circulating water pipe 13 and the circulating water pool 10 .

The high-pressure spray cooling system is composed of three spray rows 8 arranged in parallel on the upper part of the greenhouse. The three spray rows 8 are arranged equidistantly. The three spray rows 8 form three parallel first spray rows with the corresponding seedbed 9 below according to the direction of air flow. The second air duct, the air inlet side of the second air duct in the middle is connected to the air outlet side of the first air duct, and the air inlet sides of the other two second air ducts are respectively connected to the air inlet sides of the two fresh air ducts, An exhaust fan 6 is arranged outside the air outlet side of each second air duct; the exhaust fan 6 is preferably a variable frequency fan.

The function of each component in the cooling system of the wet curtain fan used in the greenhouse of the utility model:

In order to reduce the direct exposure of outdoor sunlight to the wet curtain wall and the pollution of outdoor fresh air and dust to the wet curtain wall, the traditional outdoor wet curtain wall structure is transformed into a part of the wet curtain wall located outdoors, and another part located indoors and outdoors. The wet curtain wall has the functions of humidifying, cooling, and dust removal for fresh air. It protects the indoor wet curtain wall and can be replaced frequently according to actual needs; the indoor wet curtain wall continues to process the air from the outdoor wet curtain wall. The effect of further humidification and cooling, due to the protection, the replacement cycle is extended.

There is an independently controlled air inlet window 1 on the outer wall of the greenhouse, which is specially used for ventilation in the greenhouse under the ventilation condition of the greenhouse, avoiding that the fresh air still needs to pass through the outdoor wet curtain wall 2 under the ventilation condition, and reducing the energy consumption of the system.

Combine the high-pressure spray system with the wet curtain direct evaporative cooling system, give full play to the advantages of the high-pressure spray cooling system, such as obvious cooling effect and flexible space layout, and arrange the high-pressure spray cooling system in the upper space near the fan side to reduce the high-temperature area. temperature, increase the design size of the traditional building width, and alleviate the problem of excessive temperature gradient.

The structure of the original wet curtain fan is modified, and the cooling, humidification and ventilation functions of the wet curtain direct evaporative cooling system are operated separately. At the same time, the intake fan 4 and the exhaust fan 6 are all frequency conversion fans, and the corresponding speed is adjusted according to different working conditions. Reduced system energy consumption.

The circulating pool 10 adopts a closed form and is buried under the shallow ground surface, which not only saves the floor area, but also fully exchanges heat between the water in the pool and the soil on the shallow ground layer, reduces the temperature of the circulating water, and improves the heat and humidity between the water and the air. swap effect.

Multiple air intake fans 4 are connected in parallel to form an air intake unit. The air supply mode of front air supply can be used to make the air flow uniform. The key parameters of air cooling, such as "wet exchange coefficient" and "wet curtain surface wind speed", can be controlled independently, and all the intake fans 4 can also be adjusted by frequency conversion, so as to achieve better energy-saving effect; multiple exhaust fans 6 form an exhaust fan unit, which can Independent control of non-key air cooling parameters such as "indoor air volume" and "indoor wind speed", and independent operation of air intake and exhaust, making the indoor environment control process more flexible.

The high-pressure spray system and the wet curtain direct evaporative cooling system are set inside the greenhouse, and the sunshade net 7 is arranged on it, which can not only reduce the interference of the external airflow on the heat and moisture exchange process between the air and water, but also reduce the impact of external solar radiation on the heat exchange medium. The influence of high temperature radiation ensures that the heat exchange process is carried out efficiently.

Since the indoor wet curtain wall 3 is protected by the outdoor wet curtain wall 2 and arranged in the greenhouse, there is no need to set sunshade parts and other protective measures in the air inlet direction of the indoor wet curtain wall 3, which reduces the air inlet resistance and reduces system energy consumption .

The cooling system of the wet curtain fan used in the greenhouse of the utility model divides the greenhouse into two large areas, namely the air conditioning area and the plant growth area 5 in the greenhouse, and uses a wet curtain direct evaporative cooling device to divide the air conditioning area into D area and E area. Area, F area; apply a high-pressure spray cooling system to divide the plant growth area 5 in the greenhouse into A area, B area, and C area; in the whole greenhouse, A area is opposite to D area, B area is opposite to E area, and F area is opposite to E area. Area C is opposite, and the air-conditioning conditions in the three areas are controlled by independent air intake fans 4 and corresponding wet curtain walls.

The working process of the wet curtain fan cooling system of the utility model, as shown in Figure 3, can be divided into the following two modes:

1. Air conditioner cooling condition:

If only the A district+D district or F district+C district in the greenhouse are air-conditioned, the cold water dripped in the circulation pool 10 buried in the soil is extracted by the first circulating water pump 15 and the second circulating water pump 17 respectively and drenched in the outdoor wet area. On the surface of the curtain wall 2 and the indoor wet curtain wall 3, respectively turn on the intake fan 4 in the fresh air duct where the D area and the F area are located, and turn on the exhaust fan 6 in the second air duct where the A area and the C area are located, and the outdoor fresh air passes through the outdoor wet curtain After the treatment of wall 2 and indoor wet curtain wall 3, due to the induction of the intake fan 4 in the fresh air duct, the airflow passes through the D area, A area, F area, and C area in the greenhouse in order to cool down and absorb indoor waste heat. The hot and humid air is finally discharged outside by exhaust fan 6;

If only the air-conditioning treatment is performed on the B area + E area, the cold water in the underground circulating pool 10 pumped by the first circulating water pump 15 is dripped on the surface of the outdoor wet curtain wall 2, the air intake fan 4 in the first air duct is turned on, and the E area is turned on The exhaust fan 6 in the second air duct where the outdoor fresh air is processed by the outdoor wet curtain wall 2, the air flow sequentially passes through the E area and the B area in the greenhouse to cool down, and the hot and humid air that absorbs the indoor waste heat is finally released by Exhaust fan 6 is discharged outdoors;

If there is a local high temperature phenomenon in the three subregions of A, B, and C in the greenhouse, the spray discharge 8 at the corresponding position is turned on to reduce the temperature in this area.

2. Ventilation conditions:

If only the greenhouse is ventilated, all the air inlet windows 1 are opened, and then all the air inlet fans 4 and exhaust fans 6 are turned on, so that the outdoor wet curtain wall 2 is not sprayed with water, and the indoor wet curtain wall 3 is air-intaked by a roller. The curtain is closed, and the outdoor fresh air is similar to "plug flow", which is directly sent to the room from the outside, and is discharged in time after absorbing the waste heat.

Since the air-conditioning schemes of areas A, B, C, D, E, and F in the greenhouse are relatively independent, different air-conditioning schemes can be completed by opening and closing different fans and wet curtains according to actual production needs.

The utility model is used in the wet curtain fan cooling system of the greenhouse. The high-pressure spray system is combined with the wet curtain direct evaporative cooling system, and the advantages of the high-pressure spray cooling system in terms of obvious cooling effect and flexible space arrangement are fully utilized. The upper space of the building is equipped with a high-pressure spray cooling system to reduce the temperature in the high-temperature area, increase the design size of the traditional building width, and alleviate the problem of excessive temperature gradient.

Claims (5)

1. The wet curtain fan cooling system for the greenhouse is characterized in that it includes a high-pressure spray cooling system arranged on the top of the plant growth area (5) in the greenhouse and an air conditioning area in front of the plant growth area (5) in the greenhouse The wet curtain direct evaporative cooling system; The wet curtain direct evaporative cooling system is provided with at least one; the high-pressure spray cooling system is provided with at least one; A sunshade net (7) is horizontally arranged above the wet curtain direct evaporative cooling system and the high-pressure spray cooling system; The wet curtain direct evaporative cooling system includes indoor wet curtain walls (3) parallel and oppositely arranged, and a second spray device (12) is arranged above each indoor wet curtain wall (3). Below the wall (3) is provided with a circulation pool (10) sealed in the soil, and each second spray device (12) is connected to the circulation pool (10) through a second circulation pipe (13) respectively; A first air duct is formed between the two indoor wet curtain walls (3) according to the direction in which the air flows after entering, and an outdoor wet curtain wall (2) is arranged on the outside of the greenhouse wall corresponding to the air inlet side of the first air duct. , the top of the outdoor wet curtain wall (2) is provided with a first spray device (11), and the first spray device (11) is connected to the circulating pool (10) through the first circulating water pipe (14), so The air outlet side of the first air duct corresponds to the plant growth area (5) in the greenhouse; A fresh air duct is formed between each indoor wet curtain wall (3) and the wall on the same side in the greenhouse, and an air inlet window (1) is arranged on the greenhouse wall corresponding to the air inlet side of each fresh air duct. The air outlet side of the fresh air duct corresponds to the plant growth area (5) in the greenhouse; Both the air outlet side of the first air duct and the air outlet side of the fresh air duct are provided with inlet fans (4); The high-pressure spray cooling system is composed of a plurality of spray rows (8) arranged in parallel, and each spray row (8) forms a parallel second air duct according to the direction of air flow between each spray row (8) and the corresponding seedbed (9) below. Exhaust fans (6) are arranged on the outside of the air outlet side of the second air duct. the 2. the wet curtain fan cooling system for greenhouse as claimed in claim 1, is characterized in that, described first circulating water pipe (14) is provided with first circulating water pump (15), and described first circulating water pipe ( 14) A first water quality filter (16) is provided at the connection with the circulating pool (10); The second circulating water pipe (13) is provided with a second circulating water pump (17), and the connection between the second circulating water pipe (13) and the circulating water pool (10) is provided with a second water quality filter (18). the 3. The wet curtain fan cooling system for greenhouses as claimed in claim 1, characterized in that, the inlet fan (4) is a variable frequency fan. the 4. The wet curtain fan cooling system for greenhouses according to claim 1, characterized in that, the plurality of spray rows (8) are equidistantly arranged. the 5. The wet curtain fan cooling system for greenhouse as claimed in claim 1, characterized in that, the exhaust fan (6) is a variable frequency fan. the