How to choose a ventilation scheme for the compressor room

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For air-cooled compressors, all the heat generated by them, aside from the residual heat remaining in the compressed air, must be removed from the machine room through the exhaust airflow. In water-cooled compressors, the majority of the compression heat is removed by the cooling water; therefore, only the heat generated by motor losses and compressor heat dissipation needs to be expelled through the exhaust airflow. Generally speaking, there are two options available for the discharge of the hot air after cooling in air-cooled compressors: In ventilation option A, the cooled air is allowed to flow into the machine room and then discharged using wall-mounted exhaust fans. The cooling air flow and the temperature rise in the machine room can be chosen freely, but the final temperature of the cooling air must not exceed the allowable intake temperature for the compressor’s cooling air (40 degrees Celsius). Ventilation Scheme B allows the cooled hot air to be discharged directly outside through exhaust ducts. The required cooling air flow rate and its temperature rise are determined by the cooling fan inside the compressor. Therefore, there is no need to use a exhaust fan anymore. Decision criteria for selecting the ventilation scheme: If there is a separate machine room at the location where the compressor is to be installed, it can be placed in a smaller workshop where a higher ambient temperature is acceptable. Higher ambient temperatures reduce the efficiency of compressed air dryers; therefore, it is necessary to consider whether the selected ventilation scheme can achieve the required pressure dew point. If there are other mechanical devices at the compressor installation location, such as measuring instruments or machine tools, their operating results may be affected (measurement errors, workpiece errors). Do the site conditions at the installation location permit the installation of intake and exhaust ducts? Could heat accumulate in certain areas of the machine room and not dissipate? The work of laying cables will inevitably increase costs.