Three experimental studies were conducted to quantify the effects of systemcycling, evaporator airflow, and condenser coil fouling on the performance of residentialair conditioners. For all studies, the indoor dry-bulb (db) temperature was 80?F (26.7?C)db. The cycling study consisted of twelve transient tests conducted with an outdoortemperature of 95?F (35?C) db for cycle times of 6, 10, 15, and 24 minutes. Indoorrelative humidities of 40%, 50%, and 60% were also considered. The evaporator airflowstudy consisted of twenty-four steady-state tests conducted with an indoor condition of67?F (19.4?C) wet-bulb (wb) for evaporator airflows ranging from 50% below to 37.5%above rated airflow. Outdoor temperatures of 85?F (29.4?C) db, 95?F (35?C) db, and105?F (40.6?C) db were also considered. The coil fouling study used a total of sixcondensers that were exposed to an outdoor environment for predetermined amounts oftime and tested periodically. Three of the condensers were cleaned and retested duringthe periodic testing cycles. Testing consisted of thirty-three steady-state tests conductedwith an indoor condition of 67?F (19.4?C) wb for outdoor exposure times of 0, 2000,4000, and 8000 hours. Outdoor temperatures of 82?F (27.8?C) db and 95?F (35?C) dbwere also considered.
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