room is to be maintained at 30% relative humidity and a dry-bulb temperature of 72ºF. The room has a sensible heat factor of 0.8 and a total hourly heating load of 200,000 Btu. A flow rate of 1000 cfm of outdoor air (at 20% relative humidity and a dry-bulb temperature of 40ºF) is used. In order to maintain adequate comfort, the supply air to the room is set to a dry-bulb temperature of 120ºF. To humidify the air, steam with a specific enthalpy of 1150 Btu per pound is utilized. Determine the wet bulb temperature, specific enthalpy, and volumetric flow rate of the supply air to the room. Can the supply air temperature values be obtained from the chart directly? show this on a psychrometric chart. Evaluate the increase in dry-bulb temperature as the air is sensibly heated, and the mass flow rate (in lb/hr) of steam required during the latent heating of the air. Calculate the heat added to the room during sensible heating (i.e., excluding humidification).
room is to be maintained at 30% relative humidity and a dry-bulb temperature of 72ºF. The room has a sensible heat factor of 0.8 and a total hourly heating load of 200,000 Btu. A flow rate of 1000 cfm of outdoor air (at 20% relative humidity and a dry-bulb temperature of 40ºF) is used. In order to maintain adequate comfort, the supply air to the room is set to a dry-bulb temperature of 120ºF. To humidify the air, steam with a specific enthalpy of 1150 Btu per pound is utilized. Determine the wet bulb temperature, specific enthalpy, and volumetric flow rate of the supply air to the room. Can the supply air temperature values be obtained from the chart directly? show this on a psychrometric chart. Evaluate the increase in dry-bulb temperature as the air is sensibly heated, and the mass flow rate (in lb/hr) of steam required during the latent heating of the air. Calculate the heat added to the room during sensible heating (i.e., excluding humidification).
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