What are the application fields of biological freeze-drying machine?
2022-03-11
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How to determine evaporation temperature and condensation temperature? How to debug?
- Categories:技术文章
- Time of issue:2022-03-11
(Summary description)The condensation temperature of the compressor system refers to the temperature at which the refrigerant condenses in the condenser, and the corresponding refrigerant steam pressure is the condensation pressure. For water-cooled condensers, the condensation temperature is generally 3-5 ℃ higher than the cooling water temperature.
How to determine evaporation temperature and condensation temperature? How to debug?
(Summary description)The condensation temperature of the compressor system refers to the temperature at which the refrigerant condenses in the condenser, and the corresponding refrigerant steam pressure is the condensation pressure. For water-cooled condensers, the condensation temperature is generally 3-5 ℃ higher than the cooling water temperature.
- Categories:技术文章
- Time of issue:2022-03-11 15:52
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1、 Condensation temperature:
The condensation temperature of the compressor system refers to the temperature at which the refrigerant condenses in the condenser, and the corresponding refrigerant steam pressure is the condensation pressure. For water-cooled condensers, the condensation temperature is generally 3-5 ℃ higher than the cooling water temperature.
Condensing temperature is one of the main operating parameters in the refrigeration cycle. For the actual refrigeration device, due to the small variation range of other design parameters, condensing temperature can be said to be the most important operating parameter, which is directly related to the refrigeration effect, safety, reliability and energy consumption level of the refrigeration device.
2、 Evaporation temperature:
Evaporation temperature refers to the temperature when the refrigerant evaporates and boils in the evaporator. It corresponds to the corresponding evaporation pressure. Evaporation temperature is also an important parameter in the refrigeration system. The evaporation temperature is generally 2-3 ℃ lower than the required water temperature.
The evaporation temperature is the refrigeration temperature in the ideal state, but in the actual operation, the evaporation temperature of the refrigerant is slightly lower than the refrigeration temperature by 3 to 5 degrees.
3、 How to determine evaporation temperature and condensation temperature generally:
The evaporation temperature and condensation temperature are determined according to the needs. For example, for air-cooled units, the condensation temperature mainly depends on the ambient temperature, and the evaporation temperature depends on what you apply. The evaporation temperature of air conditioners is higher, the refrigeration temperature is lower, and the freezing temperature is lower. Even in some low-temperature areas, the evaporation temperature is lower. These parameters are not unified. It mainly depends on the actual application.
Refer to the following data:
In general, water cooling: evaporation temperature = cold water outlet temperature -5 ℃ (dry evaporator), if it is a full liquid evaporator, -2 ℃.
Condensation temperature = outlet temperature of cooling water +5 ℃ air cooling: evaporation temperature = outlet temperature of cold water -5 ~ 10 ℃, condensation temperature = ambient temperature +10 ~ 15 ℃, generally 15.
4、 Influence and adjustment of evaporator temperature on refrigeration:
·The evaporation temperature is equal to the actual outside temperature minus the heat transfer temperature difference. The evaporation temperature is too high, the temperature of the cold air from the evaporator is high, the cooling is slow, and even the expected temperature cannot be reached at all. Impact on refrigeration cycle: high superheat, low return gas pressure, lower exhaust pressure, lower pressure of liquid supply pipeline and lower unit flow. This cycle makes the temperature of the warehouse slow, the machine works continuously, the wear and tear is large, and the efficiency is low.
·If the evaporation temperature is too low, there should be a scale. If it is not enough to make the machine head damp, there is no problem in cooling the warehouse. The exhaust pressure has little effect, and the exhaust temperature decreases. Increased energy consumption. If the evaporation temperature is too low and exceeds the bottom line, the air return pipe contains liquid, causing damp vehicles, and the consequences are very serious.
Evaporation temperature regulation: first of all, we should know that the lower the evaporation pressure, the lower the evaporation temperature. Evaporation temperature regulation, in actual operation, is to control the evaporation pressure, that is, to adjust the pressure value of the low-pressure pressure gauge. In operation, the low-pressure pressure is adjusted by adjusting the opening of the thermal expansion valve (or throttle valve). Large opening of expansion valve will increase evaporation temperature and low-pressure pressure, and the refrigerating capacity will increase; If the opening degree of expansion valve is small, the evaporation temperature and low-pressure pressure will be reduced, and the cooling capacity will be reduced.
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News Information
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With the development of freeze-drying machine, it can be applied in more and more fields, especially in the biological field. Freeze-drying machine is an effective new drying equipment for drying heat sensitive substances and substances that need to maintain biological activity. At present, many domestic pharmaceutical enterprises use freeze-drying method to process drugs, such as various antibiotics, biological extracts, vaccines, enzyme products, etc., and are widely used in the beauty field, such as cosmetics freeze-drying powder, freeze-drying facial mask, etc. 报错 笔记 -
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Link: Nanjing lidesheng Machinery Co., Ltd. - Nanjing Bosheng refrigeration equipment Co., Ltd
Address: No. 59-2, Xiushan Road, Gaochun Economic Development Zone, Nanjing
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Jiangsu rongyida Temperature Control Technology Co., Ltd
