It is often necessary to bring a supply of fresh air into a building to maintain air quality. Suppose that a factory needs to be cooled in the winter, and that it is desired to achieve this cooling by mixing in fresh air from the outside. To maintain air quality, at least 10% of the air inside the building must be replaced every hour with air from outside the building. The processes in the factory cause the air to be heated to 35°C before it is removed from the building. It is desired to have the air cooled to 25°C, and to maintain the humidity in the building at 40%. Specify the basic requirements of a system that will allow for this process to occur under different outdoor air conditions. Consider that the outdoor air may vary in temperature (in winter) between –15°C and 10°C, and that the relative humidity of the outside air is typically 60%.
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