In winter, the problem of coil freezing crack often occurs in fresh air air air conditioning units in northern cold areas, which seriously affects the normal maintenance of the operating room. The following laminar flow operating room decoration company will summarize some skills to prevent the passive coil of fresh air air conditioning units in laminar flow operating room.
The main reasons for coil freezing crack are as follows: 1. When fresh air air conditioning unit stops working, there is no heating measure in the room, the temperature is below -0 C, the system pump stops working, and there is no water in the coil of fresh air conditioning unit, or the water in the coil is not clean or new when the coil design is unreasonable. The air-tight valves are not closed properly.
2. Under the normal working condition of fresh air air conditioning units, the design of water system of air conditioning is out of balance, the water flow is insufficient, or the design of coil water flow is too small, or the influence of evaporation temperature of double cooling sources on coil water. For Xinfeng Air Conditioning Unit to stop working, measures to solve the freeze prevention of fresh air units are as follows: during construction, the hospital is advised to install heating facilities in the machine room; before winter comes, the water in the cold coil of fresh air conditioning unit is cleaned, the closure of the fresh air sealing valve is checked regularly, and timely repair is found to be improper; When ordering air-conditioning units, cold water coils with exhaust design are selected, and freeze-proof devices for insulation and freeze-proof are installed (see Fig. 8).
For the normal operation of fresh air air conditioning units, the measures to solve the freeze prevention of fresh air units are as follows: hydraulic calculation is carried out in the design of air conditioning water system to avoid hydraulic imbalance and insufficient water flow; fresh air power is preheated at the intake of fresh air units, and the fresh air is preheated to 5 C. As the phenomenon of freezing crack in the cold coil of fresh air air conditioning units is more common, it also attracts the attention of air conditioning units manufacturers. There are also good measures in the design of fresh air conditioning units, such as new air bypass design for fresh air units, downstream design for cold water coils (see Fig. 9), surface cooler and steam in double cold source fresh air conditioning units. Arrangement of generator, installation of steam coil breaking vacuum valve and trap, etc.
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