电竞押注

Welcome to GSP / GMP pharmaceutical cold storage construction_ Installation of 电竞押注 cold storage_ Official website of vaccine reagent cold storage design



The latest humidity scheme of biomaterial cold storage

The latest humidity scheme of biomaterial cold storage

written words: [big] [middle] [small] QR code of mobile phone page QR code Number of visits: twenty-six

The first scheme: dehumidification by reducing the temperature of evaporator

The principle of this dehumidification method is that the relative humidity of the air can be reduced by constant humidity and temperature rise, and the dew point of the machine can be controlled lower, and then the relative humidity can be reduced by heating Biomaterial cold storage Relative humidity in the.

If the dew point of the machine can reach - 1.73 ℃ and then heated to 2 ℃, the relative humidity can be lower than 75%. Therefore, the temperature of evaporator can be adjusted by frequency conversion refrigerator according to the relative humidity parameters of biomaterial cold storage.

If the relative humidity in the biomaterial cold storage meets the design requirements, the evaporator temperature only needs to meet the temperature control requirements, otherwise the principle of humidity priority is adopted.

When the relative humidity in the biomaterial cold storage is close to the upper limit or has exceeded the upper limit, the frequency conversion refrigerator is used to obtain a lower outlet air temperature, and then the relative humidity is reduced by heating, and the temperature and humidity are controlled within the specified range.

This control scheme can be used no matter whether the biological material cold storage is in the clean area or not, because the control process will not affect the external pressure of the airflow in the biological material cold storage, and will not pollute the clean area.

 

The second scheme is to inject dry compressed air into the biomaterial cold storage

The dew point temperature is - 40 ℃. If it is converted to the dew point at atmospheric pressure, it is at - 60 ℃, and the relative humidity of compressed air is about 0.2%. It is assumed that when the relative humidity of biomaterial cold storage is close to or more than 75%, the temperature in the cold storage will rise by injecting compressed air with dew point of - 60 ℃, which will force the refrigeration compressor to start.

On the other hand, the relative humidity of the biological material is close to that of the original air in the cold storage room. At the same time, after the injection of compressed air, the external micro positive pressure of the biomaterial cold storage is generated, which drives part of the air in the biomaterial cold storage to diffuse through the gap, which hinders the entry of outdoor wet air. However, this control scheme is not suitable for the biological material cold storage in the clean area, because when reducing the relative humidity in the warehouse, some air will be discharged to the surrounding area, which will have a certain impact on the pressure difference of the surrounding clean area. However, the biggest advantage of this scheme is that the investment in fixed assets is very small, the subsequent operation cost is relatively low, and the control is relatively simple.

 

The third scheme: solid dehumidification

Hygroscopic agents such as calcium chloride and silica gel can be selected for the cold storage of biomaterials. Although the dehumidification method is relatively simple and the initial investment is low, the dehumidification capacity is unstable. The dehumidification capacity of new or newly regenerated dehumidifiers is large, and the dehumidification capacity will gradually decrease or even disappear if it is not regenerated in time. The replacement and regeneration of desiccant bring some troubles to management, and it is difficult to realize the automatic control of relative humidity in biomaterial cold storage.

 

The fourth scheme: refrigerant, refrigerant and wet air three cycle wet cooling mode has the advantage that the temperature fluctuation is less than 1 ℃ and the uniformity of environmental parameters is better without frequent start-up of high-power refrigerator. Through the improvement of the automatic control system of the wet cooling system, and the relative humidity control test and research, it is found that there is no need for humidifier, simple control of refrigeration equipment, intermittent start-up, temperature difference of 1.5 ℃.

 Biomaterial cold storage


thirteen billion nine hundred and eighty-eight million eight hundred and eighty-six thousand six hundred and sixty-six
Browse mobile station