Trane trg-trc001-en Air Conditioner User Manual


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TRG-TRC001-EN 43
period six
Psychrometric Analyses
notes
For example, assume that at full load the room is subject to an 80,000 Btu/hr
sensible heat gain and a 20,000 Btu/hr latent heat gain. The full-load sensible
heat ratio is 0.80.
At other times during the day, clouds block the sun and reduce the solar heat
gain, and some of the lights are turned off. This reduces the room’s sensible
heat gain from 80,000 Btu/hr to 47,000 Btu/hr. The room’s latent heat gain
originates primarily from people. Assuming that the occupancy of the room
remains constant, the latent heat gain is still 20,000 Btu/hr and the part-load
sensible heat ratio becomes 0.70.
To maintain the design room conditions A for this part-load sensible heat ratio,
a different supply air condition—one that falls on the 0.70 SHR line—and a
different airflow are required. But suppose the system in this example was
designed to deliver a constant quantity of air and vary its supply temperature to
meet the changing loads.
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