According to research, when the relative humidity is 50%, the bacteria will die after 10 minutes of plankton; when the relative humidity is higher or lower, even after 24 hours, most of the bacteria are still alive. At room temperature, more than 60% relative humidity can be mildewed, and more than 80% will be mildewed regardless of temperature. Therefore, the relative humidity required in the standard operating room is 30% - 60%, of course, 50% is more ideal. The air conditioning system in many hospitals often presents the problem of high humidity in summer.
The purpose of dehumidification is to condense the water vapor in the air. The dehumidification in laminar operating room is accomplished by lowering the air temperature to the dew point temperature of the supply air point through the cold water coil of the clean air conditioning unit. The dew point temperature of the supply air state point is generally about 12 C. If the outlet air temperature of the cold water coil is too high, the dew point temperature of the supply air will not be guaranteed, so the indoor humidity will not be guaranteed. The main reasons for excessive humidity are as follows: 1. lack of water supply in air-conditioning water system; 2. excessive temperature of water supply in air-conditioning water system; 3. when the air-conditioning unit is in service for a long time, the surface fouling of the cold water coil is thicker, which affects the effect of air-water heat transfer and makes the heat exchange area of the cold water coil lack.
There are many reasons for the lack of water supply in air-conditioning water system, such as too small pump selection and unbalanced water supply in air-conditioning water system. Hydraulic calculation is the basis of pump selection and the balance of air-conditioning water system. It can be seen that the hydraulic calculation of air-conditioning water system is very important. The flow rate and head of the pump and the diameter of the water pipe should be selected according to the data of hydraulic calculation, and the appropriate flow velocity should be considered in hydraulic calculation.
Nowadays, the cold and heat sources of laminar flow operating rooms in many hospitals are centralized in the building in summer. The ward area is controlled by temperature first. The request for humidity is not very strict. It only needs warm temperature. Therefore, the request for cold water supply temperature is not too low. In some hospitals, the temperature of cold water supply is as high as 10 degrees Celsius. The operation department's clean air conditioning system is the humidity priority control, requesting the cold water temperature to be 7 and 10 is unable to satisfy the dehumidification request of the clean air conditioning unit. The chilled water temperature provided by the main air conditioner in the air conditioning room of local hospital buildings can reach 7 C. However, the chilled water temperature of the clean air conditioning unit can not meet the dehumidification requirement of the clean air conditioning unit because the equipment layer of the air conditioning unit purified by the operating department is far away from the main air conditioning unit and the insulation layer of the local air conditioning water pipeline is damaged.
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