After the species (planting) planting project is confirmed, the matching greenhouse option is essentially determined. In light of local specific conditions, choosing different configurations is a matter that greenhouse gas construction contributors should seriously consider. Choose low input and high output is a problem that greenhouse supply and demand parties should discuss. This article recommends the user's selection method for reference from the perspective of the greenhouse manufacturing industry.
First, the wrong season vegetable cultivation:
Planting characteristics: Planting vegetables in early spring or in late autumn, using right vegetables in advance or lagging the market, so as to increase the added value. Necessary facilities:
1, steel framework 2, covering material 3, gravity drip irrigation equipment selection:
1. There are roughly two types of skeletons for steel structures: single-span sheds and multi-span sheds. The span of single-span sheds is generally 6-18m. The span of multi-span sheds is generally 6-8m, and the interval is 2-5m. should. Under load: wind load: 400N/m2, snow load: 300N/m2, service life of hot dip galvanized steel skeleton is 20 years. Price: single building: 28 yuan / m2; connected building: 60-70 yuan / m2.
2. Cover material: Choose domestic anti-fog and anti-condensation film with a life of 3 years. Price is generally 2 yuan / m2.3, gravity drip irrigation: use of maze insert type gravity drip irrigation, the price of 2.5 yuan / m2.
Investment situation: single-family: about 20,000 yuan/mu; consecutive buildings: about 50,000 yuan/mu. The return period for investment is generally 1-2 years. This investment program has advantages over traditional bamboo structures.
Second, the four seasons of greenhouse cultivation:
Planting characteristics: The requirements are not subject to changes in the outside world, and there is an environment in which the plants adapt to plant growth. At the same time, the investment plan with the lowest operating costs is sought.
1. Necessary facilities: 1. skeleton of steel structure 2. covering material 3. insulation system 4. foundation 5. cooling system (natural ventilation, mechanical ventilation, internal and external shading) 6. heating system 7. water-saving irrigation system 8. Fertilization system 9, electrical control 10, activity or fixed seedbed selection: 1, the choice of skeleton steel framework: skeleton divided into two general categories: one is a single solar greenhouse, the other is a multi-span solar greenhouse, single-sided The span of solar greenhouses is generally 6-12 meters and the length is 30-100 meters. The arch rods have single arches and double arches (according to the span size). The span of a multi-span solar greenhouse is generally 6-12 meters, and the length and width can be arbitrarily assembled. The skeleton of steel structure is processed by hot-dip galvanizing, the service life can reach 20 years, load capacity: wind load: 600N/m2, snow load: 500N/m2, dead load: 150N/m2, live load: 155N/m2. Choice: The main consideration is land resources. Sunlight greenhouses save land compared to single-sided solar greenhouses, but their operating costs are higher than that of solar greenhouses. This type of focus is taken into account when selecting greenhouse types.
2, the choice of covering material (refers to the light covering): There are generally three kinds of covering materials, namely: film, PC hollow board, glass.
Membrane generally refers to a three-layer copolymerization of the film, that is, anti-UV layer, fiber layer and anti-fog and dew condensation layer. The thermal conductivity of the film is 6.8W/m2.k., the light transmittance is about 90%, and the service life is 3-6 years. It is recommended that the membrane covering material be used in a single-surface solar greenhouse and thermal insulation be added, so that the thermal insulation performance of the greenhouse can be greatly improved, and the scale of the covering and the greenhouse can be compared.
PC board type (PC refers to polycarbonate): PC boards are divided into single-layer boards, double-layer hollow boards, and multi-layer hollow boards, and their thermal conductivity is different. The thermal conductivity of a 8mm thick hollow board is 3.2W. /m2.k. PC board also has anti-UV layer, fiber layer, anti-condensation layer, light transmittance of 75-90%, optical stability for 10 years, and service life of up to 20 years. It is recommended for use in multi-span greenhouses or high value-added breeds, because his insulation properties are better than other cover materials, which means that operating costs can be greatly reduced.
Glass type covering material: glass generally uses float glass, thickness 5mm, glass is divided into single layer and hollow two, thermal conductivity: single layer 6W/m2.k, hollow glass 3W/m2.k, light transmittance 90-95 %, glass inlaid in the greenhouse skeleton, must use special aluminum alloy profiles, which means that the manufacturing cost is higher. In addition hail harassment factors also have to be considered. Therefore, the selection of glass materials is generally covered in greenhouses for sightseeing, tourism, flower markets, or other ornamental greenhouses or facades.
3. Insulation system: The configuration of the greenhouse insulation system is mainly used to reduce the operating costs. The following are introduced separately:
Insulation and transmission device: The insulation is a high-performance insulation facility composed of a waterproof layer, a fiber layer, an insulation layer, and a heat radiation layer. Its thermal conductivity is 1.778W/m2.0C, and its light weight is only 0.7kg per square meter. The transmission includes a motor, a speed reducer, a transmission shaft, a rocker, a telescopic pole, a distribution box, etc. The control includes a button, a remote control, and a light control. It is applied to the winter insulation of a single solar greenhouse and can also be used in a series of solar greenhouses.
Insulation wall: The northern wall of a greenhouse generally does not require light-transmitting materials. Usually, light-proof brick structures or colored insulation boards are used as insulation walls. The east-west arc wall of a single-use solar greenhouse is also covered with such materials. The cost of the brick structure wall is slightly lower than the color insulation board, but the insulation performance is much poorer (the thermal conductivity of the 100mm thick color insulation board is 0.039W/m2.k, equivalent to a 500mm thick brick structure wall)
Below the 0 line in the surrounding of the greenhouse is usually to do the next 300-800mm deep insulation wall, the thickness of the wall in the 240-500mm, to prevent the greenhouse ground heat spillover. Above the 0 line is usually to do 300-500mm high insulation wall, and plaster the surface with cement mortar. Objectives: On the one hand to prevent the overflow of ground temperature, on the other hand to prevent the local subsidence of the greenhouse base and the overall stiffness.
4. Foundation: The foundation is a T-shaped foundation made from embedded parts of concrete. It is usually designed based on the local soil structure to ensure that there is no local subsidence and enough pressure to contact with the ground. The quality of the foundation directly affects the construction quality of the greenhouse. The foundation of the multi-span solar greenhouse should be set aside, the water flow gradient is generally around 0.5%.
5, greenhouse cooling system:
Natural ventilation: It is realized by top opening windows and side opening windows. Transmission forms are gear, rack, hydraulic and roll-window. The principle is to use the air density difference to achieve heat transfer, that is: the cold air enters from below the greenhouse. Because the density of cold air is greater than that of hot air, the hot air floats on the top window to make the air directional flow. In order to achieve natural ventilation - cooling purposes.
Mechanical ventilation: It consists of a fan--wet curtain, that is, a fan is installed in the south or east and west of the greenhouse, and a wet curtain is placed on the symmetry plane of the fan. When the fan is started, the outdoor air enters the room through the wet curtain. The wet curtain is Made of hydrophobic corrugated paper, a water pump pumps water into a wet curtain to form a water curtain. When the outdoor air enters the room through the wet curtain, the water molecules begin to move directionally by the negative pressure generated by the fan, and the water molecules expand due to heat during the process of drifting toward the fan side, and are eventually exhausted outdoors by the fan. Heat exchange to achieve the purpose of cooling.
External shading system: The external shading function is shading and cooling, the shading rate of the external shading is generally 80-90%, and the cooling effect is 8-10°C. The system is established at a height of 0.5m above the greenhouse, which is caused by the motor and the speed reduction. The machine drives the gears to rotate, the gears and the racks are engaged, so the racks do reciprocating linear motion and drive the curtain rods and curtains to move horizontally in the drag line and the curtain line to realize the unfolding and retracting action, thereby forming an electric drive. Shading system.
Internal shading, insulation system: The drive method is the same as the external shading system. It is established in the greenhouse in the same position as the shoulder height. The curtain is made of aluminum foil and film weave. Its role is to shave and cool the temperature on the one hand, and it also blocks the gas flow between the supply part and the underside on the other hand to reduce heat dissipation. Area, to achieve the purpose of insulation. Insulation and cooling capacity 5 °C.
Micro-mist cooling equipment: Adding a micro-mist spray to the interior of the greenhouse, the atomizing particle size of the water is Ñ„0.015 mm. The mist particles are vaporized due to heat absorption during the drift in the air, and then sucked out of the outdoor by the induced draft fan. To achieve the purpose of heat exchange. The cooling of the mist can achieve two purposes. One is to reduce the temperature, and the other is to regulate the humidity in the greenhouse.
The above-mentioned hardware devices for the greenhouse cooling system, because the characteristics of the external temperature changes in different regions and the extreme differences in species and breeding projects, some equipment can choose to use. In addition, cooling equipment is not used at the same time. For example, skylights and side windows are closed when mechanical ventilation is used. Only in this state will the greenhouse produce negative pressure, and the purpose of cooling the mechanical ventilation can only be achieved. Cooling equipment is often used in combination to achieve a composite cooling effect. In the specific design we will help you establish a combination of cooling program.
6. Heating system: The heating method of the greenhouse mainly uses water and air as the heat transfer carrier. The heat source is mainly coal, gas, oil and electricity. Usually the heating and cooling methods are round-wing type plumbing radiators and indoor passages. The round-wing radiator (ф106) has a heat dissipation capacity of 550W/m (at the return water temperature of 670C), and the round-wing radiator is heated. Galvanized, the service life of up to 20 years. The amount of thermal energy is determined based on the thermal conductivity of the covering material, the coverage area, the minimum outdoor temperature, and the temperature that should be guaranteed in the room, that is, Q loss = VA (Ti-T0) Q loss - the sum of thermal energy loss. V--The thermal conductivity of the cover material. A--coverage area. Ti - outdoor temperature extremes. T0—The temperature that should be guaranteed indoors.
7. Water-saving irrigation system: Water-saving irrigation in greenhouses is different from that in Daejeon. Micro-sprinkler irrigation, drip irrigation, micro-fog, and infiltration irrigation are the methods for greenhouse water-saving irrigation. There are two kinds of micro-sprinkler irrigation: fixed-suspension and mobile, drip irrigation with mechanical pressure and gravity drip irrigation. There are three types of fog: hanging, mobile, and heating; fog cooling system. Generally, drip irrigation is commonly used for planting vegetables, and micro-spray irrigation is used for planting flower seedlings. Micro-mist is usually used in dry and high-temperature areas outside.
8. Fertilizing system: The greenhouse cultivation and nutrient supply are fed in a certain proportion. The crude control method is to put the nutrient solution into the fertilizing tank and inject the roots of the plant during drip irrigation. The fine control method is to set a tank for each nutrient solution, add a monitoring sensor to the soil, transfer it to the soil analysis system, and transmit the computer for intelligent control. Gas-fired plants are mainly supplemented with carbon dioxide. Breeding of greenhouses is mainly supplemented with oxygen, and the computer is constantly monitored.
9, electrical control systems: greenhouse electrical equipment, and the working environment is relatively humid, the use of requirements are also different, so the electrical control system designed to consider more content. Electrical control cabinets are generally equipped with a control room or a buffer (away from the wet environment). Electronic control according to the control method is divided into: button control, automatic control, intelligent control three. Automatic control is to set the control upper and lower limits, and to start or stop the system when the set value is over or under. Intelligent control is the use of the control of the content of each sensor, weather station data into the computer, the computer in the set of software to analyze, compare, send out control instructions, and conduct constant monitoring, and ultimately print out the monitoring data.
10, seedbed: seedbed can be divided into fixed seedbed and active seedbed, generally used in flowers, seedlings cultivation. Active bed can save a lot of use of space. In the configuration of the greenhouse, people easily overlooked the issue of gutter insulation. The usual practice: the gutter is always exposed. We know that the thermal resistance of iron is very small and approaches 0. If we are to build a 10,000 m2 multi-span greenhouse, then there will be 440 m2 of gutter (expansion area) exposed and the loss of heat energy is amazing. of. Recently, our company has designed the gutter insulation and added a new type of insulation material, so that the heat loss and the decline in the amount of heat have been reduced to almost zero.
III. Greenhouses for other uses: With the continual improvement of greenhouse technologies, greenhouses are used in many industries, such as breeding greenhouses: cattle, sheep, chickens, ducks, geese, and aquatic products. These greenhouses are based on different culture contents. The biggest difference between the design and the cultivation of greenhouses is in the gas nutrient (planting supplement is carbon dioxide, breeding is supplementing oxygen, and other aspects are also different. There are newly developed greenhouses integrating tourism, sightseeing, and catering, which Greenhouses pay attention to the peculiar effects and attract the attention of many people from all walks of life.The configuration of greenhouses should also be different, especially in the supply of oxygen. The necessary equipment should be added to the air purification, in terms of temperature. It should also be greatly reduced.
Fourth, the selection of greenhouses focuses on the configuration, the more reasonable the allocation, the more sufficient the decision-making basis, and the higher the investment returns. Greenhouse configuration principles:
1, the principle and function should be clear.
2. Configure the equipment according to the extremum of the local weather data.
3. Find out the relationship between investment and operating costs, and choose their equipment and materials.
4. In the cycle of rejection, generally the greenhouse must not exceed 2 years, and the high-grade greenhouse cannot exceed 5 years.
First, the wrong season vegetable cultivation:
Planting characteristics: Planting vegetables in early spring or in late autumn, using right vegetables in advance or lagging the market, so as to increase the added value. Necessary facilities:
1, steel framework 2, covering material 3, gravity drip irrigation equipment selection:
1. There are roughly two types of skeletons for steel structures: single-span sheds and multi-span sheds. The span of single-span sheds is generally 6-18m. The span of multi-span sheds is generally 6-8m, and the interval is 2-5m. should. Under load: wind load: 400N/m2, snow load: 300N/m2, service life of hot dip galvanized steel skeleton is 20 years. Price: single building: 28 yuan / m2; connected building: 60-70 yuan / m2.
2. Cover material: Choose domestic anti-fog and anti-condensation film with a life of 3 years. Price is generally 2 yuan / m2.3, gravity drip irrigation: use of maze insert type gravity drip irrigation, the price of 2.5 yuan / m2.
Investment situation: single-family: about 20,000 yuan/mu; consecutive buildings: about 50,000 yuan/mu. The return period for investment is generally 1-2 years. This investment program has advantages over traditional bamboo structures.
Second, the four seasons of greenhouse cultivation:
Planting characteristics: The requirements are not subject to changes in the outside world, and there is an environment in which the plants adapt to plant growth. At the same time, the investment plan with the lowest operating costs is sought.
1. Necessary facilities: 1. skeleton of steel structure 2. covering material 3. insulation system 4. foundation 5. cooling system (natural ventilation, mechanical ventilation, internal and external shading) 6. heating system 7. water-saving irrigation system 8. Fertilization system 9, electrical control 10, activity or fixed seedbed selection: 1, the choice of skeleton steel framework: skeleton divided into two general categories: one is a single solar greenhouse, the other is a multi-span solar greenhouse, single-sided The span of solar greenhouses is generally 6-12 meters and the length is 30-100 meters. The arch rods have single arches and double arches (according to the span size). The span of a multi-span solar greenhouse is generally 6-12 meters, and the length and width can be arbitrarily assembled. The skeleton of steel structure is processed by hot-dip galvanizing, the service life can reach 20 years, load capacity: wind load: 600N/m2, snow load: 500N/m2, dead load: 150N/m2, live load: 155N/m2. Choice: The main consideration is land resources. Sunlight greenhouses save land compared to single-sided solar greenhouses, but their operating costs are higher than that of solar greenhouses. This type of focus is taken into account when selecting greenhouse types.
2, the choice of covering material (refers to the light covering): There are generally three kinds of covering materials, namely: film, PC hollow board, glass.
Membrane generally refers to a three-layer copolymerization of the film, that is, anti-UV layer, fiber layer and anti-fog and dew condensation layer. The thermal conductivity of the film is 6.8W/m2.k., the light transmittance is about 90%, and the service life is 3-6 years. It is recommended that the membrane covering material be used in a single-surface solar greenhouse and thermal insulation be added, so that the thermal insulation performance of the greenhouse can be greatly improved, and the scale of the covering and the greenhouse can be compared.
PC board type (PC refers to polycarbonate): PC boards are divided into single-layer boards, double-layer hollow boards, and multi-layer hollow boards, and their thermal conductivity is different. The thermal conductivity of a 8mm thick hollow board is 3.2W. /m2.k. PC board also has anti-UV layer, fiber layer, anti-condensation layer, light transmittance of 75-90%, optical stability for 10 years, and service life of up to 20 years. It is recommended for use in multi-span greenhouses or high value-added breeds, because his insulation properties are better than other cover materials, which means that operating costs can be greatly reduced.
Glass type covering material: glass generally uses float glass, thickness 5mm, glass is divided into single layer and hollow two, thermal conductivity: single layer 6W/m2.k, hollow glass 3W/m2.k, light transmittance 90-95 %, glass inlaid in the greenhouse skeleton, must use special aluminum alloy profiles, which means that the manufacturing cost is higher. In addition hail harassment factors also have to be considered. Therefore, the selection of glass materials is generally covered in greenhouses for sightseeing, tourism, flower markets, or other ornamental greenhouses or facades.
3. Insulation system: The configuration of the greenhouse insulation system is mainly used to reduce the operating costs. The following are introduced separately:
Insulation and transmission device: The insulation is a high-performance insulation facility composed of a waterproof layer, a fiber layer, an insulation layer, and a heat radiation layer. Its thermal conductivity is 1.778W/m2.0C, and its light weight is only 0.7kg per square meter. The transmission includes a motor, a speed reducer, a transmission shaft, a rocker, a telescopic pole, a distribution box, etc. The control includes a button, a remote control, and a light control. It is applied to the winter insulation of a single solar greenhouse and can also be used in a series of solar greenhouses.
Insulation wall: The northern wall of a greenhouse generally does not require light-transmitting materials. Usually, light-proof brick structures or colored insulation boards are used as insulation walls. The east-west arc wall of a single-use solar greenhouse is also covered with such materials. The cost of the brick structure wall is slightly lower than the color insulation board, but the insulation performance is much poorer (the thermal conductivity of the 100mm thick color insulation board is 0.039W/m2.k, equivalent to a 500mm thick brick structure wall)
Below the 0 line in the surrounding of the greenhouse is usually to do the next 300-800mm deep insulation wall, the thickness of the wall in the 240-500mm, to prevent the greenhouse ground heat spillover. Above the 0 line is usually to do 300-500mm high insulation wall, and plaster the surface with cement mortar. Objectives: On the one hand to prevent the overflow of ground temperature, on the other hand to prevent the local subsidence of the greenhouse base and the overall stiffness.
4. Foundation: The foundation is a T-shaped foundation made from embedded parts of concrete. It is usually designed based on the local soil structure to ensure that there is no local subsidence and enough pressure to contact with the ground. The quality of the foundation directly affects the construction quality of the greenhouse. The foundation of the multi-span solar greenhouse should be set aside, the water flow gradient is generally around 0.5%.
5, greenhouse cooling system:
Natural ventilation: It is realized by top opening windows and side opening windows. Transmission forms are gear, rack, hydraulic and roll-window. The principle is to use the air density difference to achieve heat transfer, that is: the cold air enters from below the greenhouse. Because the density of cold air is greater than that of hot air, the hot air floats on the top window to make the air directional flow. In order to achieve natural ventilation - cooling purposes.
Mechanical ventilation: It consists of a fan--wet curtain, that is, a fan is installed in the south or east and west of the greenhouse, and a wet curtain is placed on the symmetry plane of the fan. When the fan is started, the outdoor air enters the room through the wet curtain. The wet curtain is Made of hydrophobic corrugated paper, a water pump pumps water into a wet curtain to form a water curtain. When the outdoor air enters the room through the wet curtain, the water molecules begin to move directionally by the negative pressure generated by the fan, and the water molecules expand due to heat during the process of drifting toward the fan side, and are eventually exhausted outdoors by the fan. Heat exchange to achieve the purpose of cooling.
External shading system: The external shading function is shading and cooling, the shading rate of the external shading is generally 80-90%, and the cooling effect is 8-10°C. The system is established at a height of 0.5m above the greenhouse, which is caused by the motor and the speed reduction. The machine drives the gears to rotate, the gears and the racks are engaged, so the racks do reciprocating linear motion and drive the curtain rods and curtains to move horizontally in the drag line and the curtain line to realize the unfolding and retracting action, thereby forming an electric drive. Shading system.
Internal shading, insulation system: The drive method is the same as the external shading system. It is established in the greenhouse in the same position as the shoulder height. The curtain is made of aluminum foil and film weave. Its role is to shave and cool the temperature on the one hand, and it also blocks the gas flow between the supply part and the underside on the other hand to reduce heat dissipation. Area, to achieve the purpose of insulation. Insulation and cooling capacity 5 °C.
Micro-mist cooling equipment: Adding a micro-mist spray to the interior of the greenhouse, the atomizing particle size of the water is Ñ„0.015 mm. The mist particles are vaporized due to heat absorption during the drift in the air, and then sucked out of the outdoor by the induced draft fan. To achieve the purpose of heat exchange. The cooling of the mist can achieve two purposes. One is to reduce the temperature, and the other is to regulate the humidity in the greenhouse.
The above-mentioned hardware devices for the greenhouse cooling system, because the characteristics of the external temperature changes in different regions and the extreme differences in species and breeding projects, some equipment can choose to use. In addition, cooling equipment is not used at the same time. For example, skylights and side windows are closed when mechanical ventilation is used. Only in this state will the greenhouse produce negative pressure, and the purpose of cooling the mechanical ventilation can only be achieved. Cooling equipment is often used in combination to achieve a composite cooling effect. In the specific design we will help you establish a combination of cooling program.
6. Heating system: The heating method of the greenhouse mainly uses water and air as the heat transfer carrier. The heat source is mainly coal, gas, oil and electricity. Usually the heating and cooling methods are round-wing type plumbing radiators and indoor passages. The round-wing radiator (ф106) has a heat dissipation capacity of 550W/m (at the return water temperature of 670C), and the round-wing radiator is heated. Galvanized, the service life of up to 20 years. The amount of thermal energy is determined based on the thermal conductivity of the covering material, the coverage area, the minimum outdoor temperature, and the temperature that should be guaranteed in the room, that is, Q loss = VA (Ti-T0) Q loss - the sum of thermal energy loss. V--The thermal conductivity of the cover material. A--coverage area. Ti - outdoor temperature extremes. T0—The temperature that should be guaranteed indoors.
7. Water-saving irrigation system: Water-saving irrigation in greenhouses is different from that in Daejeon. Micro-sprinkler irrigation, drip irrigation, micro-fog, and infiltration irrigation are the methods for greenhouse water-saving irrigation. There are two kinds of micro-sprinkler irrigation: fixed-suspension and mobile, drip irrigation with mechanical pressure and gravity drip irrigation. There are three types of fog: hanging, mobile, and heating; fog cooling system. Generally, drip irrigation is commonly used for planting vegetables, and micro-spray irrigation is used for planting flower seedlings. Micro-mist is usually used in dry and high-temperature areas outside.
8. Fertilizing system: The greenhouse cultivation and nutrient supply are fed in a certain proportion. The crude control method is to put the nutrient solution into the fertilizing tank and inject the roots of the plant during drip irrigation. The fine control method is to set a tank for each nutrient solution, add a monitoring sensor to the soil, transfer it to the soil analysis system, and transmit the computer for intelligent control. Gas-fired plants are mainly supplemented with carbon dioxide. Breeding of greenhouses is mainly supplemented with oxygen, and the computer is constantly monitored.
9, electrical control systems: greenhouse electrical equipment, and the working environment is relatively humid, the use of requirements are also different, so the electrical control system designed to consider more content. Electrical control cabinets are generally equipped with a control room or a buffer (away from the wet environment). Electronic control according to the control method is divided into: button control, automatic control, intelligent control three. Automatic control is to set the control upper and lower limits, and to start or stop the system when the set value is over or under. Intelligent control is the use of the control of the content of each sensor, weather station data into the computer, the computer in the set of software to analyze, compare, send out control instructions, and conduct constant monitoring, and ultimately print out the monitoring data.
10, seedbed: seedbed can be divided into fixed seedbed and active seedbed, generally used in flowers, seedlings cultivation. Active bed can save a lot of use of space. In the configuration of the greenhouse, people easily overlooked the issue of gutter insulation. The usual practice: the gutter is always exposed. We know that the thermal resistance of iron is very small and approaches 0. If we are to build a 10,000 m2 multi-span greenhouse, then there will be 440 m2 of gutter (expansion area) exposed and the loss of heat energy is amazing. of. Recently, our company has designed the gutter insulation and added a new type of insulation material, so that the heat loss and the decline in the amount of heat have been reduced to almost zero.
III. Greenhouses for other uses: With the continual improvement of greenhouse technologies, greenhouses are used in many industries, such as breeding greenhouses: cattle, sheep, chickens, ducks, geese, and aquatic products. These greenhouses are based on different culture contents. The biggest difference between the design and the cultivation of greenhouses is in the gas nutrient (planting supplement is carbon dioxide, breeding is supplementing oxygen, and other aspects are also different. There are newly developed greenhouses integrating tourism, sightseeing, and catering, which Greenhouses pay attention to the peculiar effects and attract the attention of many people from all walks of life.The configuration of greenhouses should also be different, especially in the supply of oxygen. The necessary equipment should be added to the air purification, in terms of temperature. It should also be greatly reduced.
Fourth, the selection of greenhouses focuses on the configuration, the more reasonable the allocation, the more sufficient the decision-making basis, and the higher the investment returns. Greenhouse configuration principles:
1, the principle and function should be clear.
2. Configure the equipment according to the extremum of the local weather data.
3. Find out the relationship between investment and operating costs, and choose their equipment and materials.
4. In the cycle of rejection, generally the greenhouse must not exceed 2 years, and the high-grade greenhouse cannot exceed 5 years.
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