Calcium chloride brine is widely used in practical engineering projects, and its advantages are prominent, such as high specific heat, high density, low viscosity, high thermal conductivity, low cost and so on. However, its disadvantage is also very prominent, that is, it is corrosive. The service life of each brine system will be relatively short. In addition, there will be many small problems within the service life, which requires a lot of manpower to maintain. Therefore, at present, high-end pharmaceutical enterprises no longer use brine and have adopted the corresponding products of glacier coolant.

The new project design institute is designed according to the physical parameters of glacier coolant, with good use effect and low operation cost. However, there are more or less minor defects in the use of the transformation project, and then summarize some precautions for the transformation of brine system:

  1. During the transformation of the refrigeration host, due to the different physical properties of the coolant, there should be a good trade-off between the cost and effect when selecting the coolant, and try to select the one with similar physical parameters to ensure the heat exchange.
  2. The transformation of the coolant pump is directly related to the effect of heat exchange. The change of coolant density and viscosity often leads to the cheap operation curve of the pump, which can not reach the design flow, resulting in slow cooling and unable to pull down the temperature. Therefore, in the transformation system, the pump needs to be rechecked and selected. Since the equipment cost of the pump is not high, it is recommended to replace the pump. Variable frequency pump is recommended for systems with long operation time and large load fluctuation.
  3. It is suggested to adopt the secondary pump circulation system and set a buffer pool in the middle. The larger the filling volume in the pool, the more stable the temperature during operation. However, considering the economy of initial investment, the end load and the frequency of start and stop of the main engine are comprehensively considered. Energy saving and stable operation of the system can be realized.
  4. For the cleaning of the original system, the calcium chloride in the system must be cleaned. Calcium chloride belongs to strong acid and weak alkali salt. The system is acidic and corrosive.

Glacial coolant has accumulated a lot of experience in the transformation of calcium chloride brine cooling system. The above are some common problems for your design reference, so as to avoid problems with changing the refrigerant directly.