Clean room fan coil air conditioning system
In order to adapt to the change of the transient load of the room in the purification workshop, there are usually three local adjustment methods for the fan coil unit: adjusting the water volume, adjusting the air volume and adjusting the bypass door. The air-conditioning system of the fan coil unit is divided by the way of taking fresh air. There are fresh air system on site and independent fresh air...
Text label: purification pharmaceutical cleanroom design, purification workshop air conditioning system, fan coil air conditioning system
Fan coil air conditioning system of purification workshop
In order to adapt to the change of the room's transient load in the purification workshop, there are usually three local adjustment methods for the fan coil unit: adjusting the water volume, adjusting the air volume and adjusting the bypass door. The air-conditioning system of the fan coil unit is divided into the way of taking fresh air, which is divided into the fresh air system and the independent fresh air system. to undertake. For the independent fresh air system, it is generally divided into three types according to the way to bear the indoor load: the fresh air is treated to the indoor air enthalpy value, and does not bear the indoor load; the enthalpy value after the fresh air treatment is lower than the indoor enthalpy value, and bears part of the indoor load; The fresh air system only bears the heat transfer load of the envelope structure, and the coils bear other transient loads.
Transient loads are indoor lighting, equipment and personnel heat dissipation and solar radiation heat, etc. These instantaneous changes cause transient loads of different sizes in each room, which can be borne by the coil in the fan coil unit. The coil can be adjusted by adjusting the water temperature or water volume according to the indoor thermostat, through the straight-through or three-way control valve, or by adjusting the opening degree of the coil bypass vent; Hydraulic conditions are stable. Gradual load transfers heat through the indoor and outdoor temperature difference of the envelope structure. The change of this part of the heat load is roughly the same for all rooms. Although the outdoor air temperature also changes irregularly within a few days, it has little impact on the interior. The load mainly varies greatly with the season; the slow heat transfer load change, which is relatively consistent for all rooms, can be adapted by centrally adjusting the temperature of the fresh air, that is, the fresh air bears a stable and gradual load. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for purification workshops and clean workshops.
Dual-pipe system can only supply water of the same temperature to all coils at the same time. With the reduction of indoor load, there are two types of annual operation adjustment of coils, non-convertible operation adjustment and conversion operation adjustment. For summer operation, the non-conversion system uses cold fresh air and cold water. As the outdoor temperature decreases, only the reheat is adjusted centrally to gradually increase the fresh air temperature, while water at a certain temperature is always supplied throughout the year, and the fresh air temperature is based on the corresponding A/T The ratio is adjusted with the change of outdoor temperature to offset the heat transfer load of the envelope structure, and when the air supply state needs to be adjusted with the change of the transient sensible heat and cooling load, the capacity of the coil can be adjusted locally; the investment of the system is not converted It is cheaper and more convenient to operate, but when the winter is very cold and the time is long, the fresh air has to bear all the heating load in winter, and the capacity of the centralized heating equipment must be large. For summer operation, the conversion system still uses cold fresh air and cold water. As the outdoor air temperature decreases, the fresh air reheat is adjusted centrally, and the fresh air temperature is gradually increased to offset the change in heat transfer load. The coil water temperature remains unchanged. Depends on the amount of regulation to eliminate the effects of transient loads.
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