The design condition for a space is 77oF db and 50% relative humidity with 55oF db supply air at 90% relative humidity. A 50-ton, constant-volume space air- conditioning system uses face and bypass and water temperature control. Outdoor air is supplied at 95oF db, 60% relative humidity with a ratio of 1 lbm to 5 lbm re-circulated air. A part-load condition exists where the total space load is decreased by 50% and the SHF is increased to 90%. The outdoor air condition changes to 85oF db and 70% relative humidity. Assume sea-level conditions.
The design condition for a space is 77oF db and 50% relative humidity with 55oF db supply air at 90% relative humidity. A 50-ton, constant-volume space air- conditioning system uses face and bypass and water temperature control. Outdoor air is supplied at 95oF db, 60% relative humidity with a ratio of 1 lbm to 5 lbm re-circulated air. A part-load condition exists where the total space load is decreased by 50% and the SHF is increased to 90%. The outdoor air condition changes to 85oF db and 70% relative humidity. Assume sea-level conditions.
a) At full – load conditions:
a. Show all the processes on a psychrometric chart.
b. Determine the temperature must the air be supplied to the space at full
load conditions.
c. Determine the apparatus dew point temperature at full load conditions.
b)At part – load conditions:
a. Show all the processes on a psychrometric chart.
b. Determine the temperature must the air be supplied to the space at part
load conditions.
c. Determine the apparatus dew point temperature at part load conditions.
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