Air conditioning cold storage
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1.Introduction of modified atmosphere storage
The modified atmosphere storage is also called the modified atmosphere storage or the modified atmosphere storage. Controlled atmosphere storage is now an advanced method of preservation and storage of fruits and vegetables. Generally by the airtight reservoir, air conditioning system, refrigeration system, humidification system, pressure balance system and temperature, humidity, O2, CO2, gas automatic detection and control system. It is on the basis of refrigeration, increase gas composition regulation, through the control of temperature, humidity, carbon dioxide, oxygen concentration and ethylene concentration in the storage environment, inhibit the respiration of fruits and vegetables, delay the metabolic process, better maintain the freshness and commodity of fruits and vegetables, and extend the storage period and shelf life of fruits and vegetables. Usually controlled atmosphere storage than ordinary refrigeration can extend the storage period of 2-3 times.
2.modified atmosphere preservation principle of fresh storage:
The so-called atmosphere preservation is through the gas adjustment method, to achieve the effect of preservation. Gas regulation is to reduce the oxygen concentration in the air from 21% to 3% and 5%, that is, the fresh storage is based on the high temperature cold storage, plus a set of atmosphere control system, using the temperature and control of oxygen content in two aspects of the joint effect, in order to inhibit the respiration of fruits and vegetables after harvest.
3.The advantages of modified atmosphere storage:
(1)Wide scope of applicationSuitable for all kinds of fruits, vegetables, flowers, seedlings and other fresh-keeping in the south and north of China.
(2)long storage periodHigh economic efficiency. For example, after 7 months of preservation of grapes, 6 months of apples and 7 months of garlic moss, the quality is as fresh as ever, and the total loss is less than 5%. Generally, the price of grape origin is only 1.5 yuan/kg, while the price can reach 6 yuan/kg before and after the Spring Festival. One-time investment in the construction of cold storage, the service life of up to 30 years, the economic benefit is very significant. Investment in the year, the year results.
(3)Simple operation technology, easy maintenance.Refrigeration equipment microcomputer control temperature, automatic startup, shutdown, no need for special monitoring, supporting technology is economical and practical.
4.Matters needing attention in the design and installation of modified atmosphere storage:
1. The air-conditioned warehouse is generally designed as a multi-room form (suitable for batch import and export). The storage capacity of a single room is usually between 50 and 200t, and the height should be appropriate (increase the storage capacity per unit area).
2. The air conditioning warehouse must have better air tightness. Ordinary cold storage is generally suitable for multiple storage in the form of frequent shipments, while the operation mode of air-conditioned storage is generally a purchase/a shipment. This is because the gas composition required to form in the air conditioning warehouse is maintained, and the set value is maintained for a long time during the storage of fruits and vegetables, so as to reduce the "cross-gas" inside and outside the warehouse ".
3. The air-conditioning warehouse is a more closed cold storage. When the temperature in the warehouse rises and falls, the gas pressure also changes, and a certain air pressure difference will be formed inside and outside the warehouse. Therefore, the setting of the air pressure balance safety device is necessary. Otherwise, it is easy to make the reservoir body pressure seepage and destroy the "modified atmosphere" state.
4. Controlled atmosphere storage requires fruits and vegetables to be stored quickly. After being filled, the storage will be sealed to adjust the air composition in the storage, so that fruits and vegetables can enter the "controlled atmosphere" state in a very short time. In normal management, it is impossible to "casually" enter and exit the goods like ordinary cold storage, otherwise the gas composition in the warehouse will change frequently, thus weakening or losing the role of controlled atmosphere storage. When fruits and vegetables are out of the warehouse, it is recommended to finish them at one time or in batches in a short period of time.
5. The goods stored in the air-conditioned warehouse are fruits and vegetables. In order to reduce dry consumption, small heat transfer temperature difference is an effective method to maintain the higher relative humidity required in the warehouse.
The storage conditions of different fruits and vegetables need to adjust the air composition of the storage space. The equipment for adjusting the air composition should be reasonably configured according to the storage conditions of different fruits and vegetables. The key to the controlled atmosphere storage of fruits and vegetables is to control the controlled atmosphere parameters in the library to maintain the freshness of fruits and vegetables. Extend the storage time. Therefore, it is very important to accurately grasp the (suitable) controlled atmosphere parameters of the stored fruit and vegetable products (the percentage content of nitrogen, oxygen and carbon dioxide gas), which largely determines the success or failure and effect of controlled atmosphere storage.
7. The library body form of the air conditioning library can also be various, including civil construction form or library board assembly type. However, due to the above characteristics of the air conditioning library, the storage time is longer, in the air conditioning library body design should pay attention to choose the appropriate form and material.
8. At present, due to the consideration of many factors such as cost, the air-conditioned warehouse adopts more building plates assembled with polystyrene color steel plates. However, the water absorption rate of polystyrene itself is high, and the use effect and service life will be affected to a certain extent for the air conditioning warehouse with high humidity requirements. The air tightness of the polystyrene color steel plate after splicing is not easy to handle. The assembled air conditioning warehouse adopts polyurethane color steel library board, and its water absorption, heat preservation effect and air tightness after splicing are far better than the building board of polystyrene color steel plate.
9. The selection of the warehouse door of the air conditioning warehouse is also the key. If the air tightness of the warehouse door of the air conditioning warehouse is not good, it is easy to "leak air" and lead to the destruction of the required "air conditioning" state.
10. Generally, it is not suitable to use such a balance window in the air conditioning warehouse. If the inside and outside are connected, the "air conditioning" state in the warehouse will be "lost". Therefore, it is necessary to select or design an air pressure balance safety device suitable for the air conditioning warehouse.
11. It is recommended to use double-speed air cooler in the design of modified atmosphere storage. If the use of direct evaporative air cooler should pay attention to minimize the difference between the evaporation temperature and the temperature of the storage (usually choose below 3 ℃, in order to reduce the evaporator frosting, dehydration, maintain a higher relative humidity in the library), so, relative to the general cold storage of the evaporator, air conditioning storage in the air conditioning fan heat exchange area should be appropriately increased. If the fruits and vegetables can be pre-cooled (such as vacuum pre-cooling) in time before storage after picking, the preservation effect is better.
BINGGONGDAO Cold Chain Technology (Shandong) Co., Ltd.
Binggong Island Cold Chain Technology (Shandong) Co., Ltd. is located in the national high-tech industrial development zone on the Bohai Rim Economic Circle-Dezhou High-tech Industrial Development Zone. The company is a group member of Shandong Refrigeration Society, and has cooperated with many well-known colleges and universities in the country, and has obtained a number of technical application patents and high-tech enterprise certificates. The company holds the national refrigeration equipment industrial product production license, and passed the international quality management system certification, as well as electrical products 3c certification, environmental system certification.
- Product Description
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- Commodity name: Air conditioning cold storage
1.Introduction of modified atmosphere storage
The modified atmosphere storage is also called the modified atmosphere storage or the modified atmosphere storage. Controlled atmosphere storage is now an advanced method of preservation and storage of fruits and vegetables. Generally by the airtight reservoir, air conditioning system, refrigeration system, humidification system, pressure balance system and temperature, humidity, O2, CO2, gas automatic detection and control system. It is on the basis of refrigeration, increase gas composition regulation, through the control of temperature, humidity, carbon dioxide, oxygen concentration and ethylene concentration in the storage environment, inhibit the respiration of fruits and vegetables, delay the metabolic process, better maintain the freshness and commodity of fruits and vegetables, and extend the storage period and shelf life of fruits and vegetables. Usually controlled atmosphere storage than ordinary refrigeration can extend the storage period of 2-3 times.
2.modified atmosphere preservation principle of fresh storage:
The so-called atmosphere preservation is through the gas adjustment method, to achieve the effect of preservation. Gas regulation is to reduce the oxygen concentration in the air from 21% to 3% and 5%, that is, the fresh storage is based on the high temperature cold storage, plus a set of atmosphere control system, using the temperature and control of oxygen content in two aspects of the joint effect, in order to inhibit the respiration of fruits and vegetables after harvest.
3.The advantages of modified atmosphere storage:
(1)Wide scope of applicationSuitable for all kinds of fruits, vegetables, flowers, seedlings and other fresh-keeping in the south and north of China.
(2)long storage periodHigh economic efficiency. For example, after 7 months of preservation of grapes, 6 months of apples and 7 months of garlic moss, the quality is as fresh as ever, and the total loss is less than 5%. Generally, the price of grape origin is only 1.5 yuan/kg, while the price can reach 6 yuan/kg before and after the Spring Festival. One-time investment in the construction of cold storage, the service life of up to 30 years, the economic benefit is very significant. Investment in the year, the year results.
(3)Simple operation technology, easy maintenance.Refrigeration equipment microcomputer control temperature, automatic startup, shutdown, no need for special monitoring, supporting technology is economical and practical.
4.Matters needing attention in the design and installation of modified atmosphere storage:
1. The air-conditioned warehouse is generally designed as a multi-room form (suitable for batch import and export). The storage capacity of a single room is usually between 50 and 200t, and the height should be appropriate (increase the storage capacity per unit area).
2. The air conditioning warehouse must have better air tightness. Ordinary cold storage is generally suitable for multiple storage in the form of frequent shipments, while the operation mode of air-conditioned storage is generally a purchase/a shipment. This is because the gas composition required to form in the air conditioning warehouse is maintained, and the set value is maintained for a long time during the storage of fruits and vegetables, so as to reduce the "cross-gas" inside and outside the warehouse ".
3. The air-conditioning warehouse is a more closed cold storage. When the temperature in the warehouse rises and falls, the gas pressure also changes, and a certain air pressure difference will be formed inside and outside the warehouse. Therefore, the setting of the air pressure balance safety device is necessary. Otherwise, it is easy to make the reservoir body pressure seepage and destroy the "modified atmosphere" state.
4. Controlled atmosphere storage requires fruits and vegetables to be stored quickly. After being filled, the storage will be sealed to adjust the air composition in the storage, so that fruits and vegetables can enter the "controlled atmosphere" state in a very short time. In normal management, it is impossible to "casually" enter and exit the goods like ordinary cold storage, otherwise the gas composition in the warehouse will change frequently, thus weakening or losing the role of controlled atmosphere storage. When fruits and vegetables are out of the warehouse, it is recommended to finish them at one time or in batches in a short period of time.
5. The goods stored in the air-conditioned warehouse are fruits and vegetables. In order to reduce dry consumption, small heat transfer temperature difference is an effective method to maintain the higher relative humidity required in the warehouse.
The storage conditions of different fruits and vegetables need to adjust the air composition of the storage space. The equipment for adjusting the air composition should be reasonably configured according to the storage conditions of different fruits and vegetables. The key to the controlled atmosphere storage of fruits and vegetables is to control the controlled atmosphere parameters in the library to maintain the freshness of fruits and vegetables. Extend the storage time. Therefore, it is very important to accurately grasp the (suitable) controlled atmosphere parameters of the stored fruit and vegetable products (the percentage content of nitrogen, oxygen and carbon dioxide gas), which largely determines the success or failure and effect of controlled atmosphere storage.
7. The library body form of the air conditioning library can also be various, including civil construction form or library board assembly type. However, due to the above characteristics of the air conditioning library, the storage time is longer, in the air conditioning library body design should pay attention to choose the appropriate form and material.
8. At present, due to the consideration of many factors such as cost, the air-conditioned warehouse adopts more building plates assembled with polystyrene color steel plates. However, the water absorption rate of polystyrene itself is high, and the use effect and service life will be affected to a certain extent for the air conditioning warehouse with high humidity requirements. The air tightness of the polystyrene color steel plate after splicing is not easy to handle. The assembled air conditioning warehouse adopts polyurethane color steel library board, and its water absorption, heat preservation effect and air tightness after splicing are far better than the building board of polystyrene color steel plate.
9. The selection of the warehouse door of the air conditioning warehouse is also the key. If the air tightness of the warehouse door of the air conditioning warehouse is not good, it is easy to "leak air" and lead to the destruction of the required "air conditioning" state.
10. Generally, it is not suitable to use such a balance window in the air conditioning warehouse. If the inside and outside are connected, the "air conditioning" state in the warehouse will be "lost". Therefore, it is necessary to select or design an air pressure balance safety device suitable for the air conditioning warehouse.
11. It is recommended to use double-speed air cooler in the design of modified atmosphere storage. If the use of direct evaporative air cooler should pay attention to minimize the difference between the evaporation temperature and the temperature of the storage (usually choose below 3 ℃, in order to reduce the evaporator frosting, dehydration, maintain a higher relative humidity in the library), so, relative to the general cold storage of the evaporator, air conditioning storage in the air conditioning fan heat exchange area should be appropriately increased. If the fruits and vegetables can be pre-cooled (such as vacuum pre-cooling) in time before storage after picking, the preservation effect is better.
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