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Evaluation of a Local Air Conditioning Duty Cycling Device as a Load Management Tool
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During the summer of 1984, a test was performed to evaluate a local air conditioning duty cycling device as a tool to reduce TUEC's system summer peak demand. In addition to the local duty cycling device, a direct load control device using a power line carrier system was operated, and the results of the two systems were compared. Thirty single family homes in Garland and Richardson were included in the test. The homes' air conditioning compressors were controlled 4 days per week during the test period, using the local and direct control systems on alternate days. Both systems were programmed to cycle the compressor off 30% of the time when operating. The days when no control was performed were used as a base for comparison to the days when the air conditioners were controlled. The local control device and the direct control device were both found to reduce demand of the compressor by about 0.65 kW at 100°F ambient temperature. Also, the kW reduction achieved was found to increase with higher ambient temperatures. It was also shown that for more oversized units, a higher ambient temperature must be reached in order to achieve the same demand reduction as a properly sized unit. Both control devices were found to cause a minimum amount of discomfort to customers although they raised the temperature in the homes about 2°F during the hottest part of the day. The control did, however, make existing problems with air conditioners, such as improper maintenance and extreme undersizing, more noticeable to the customer, causing them to blame the controls for their discomfort. Finally, the customers were found to look more favorably upon the company as a result of participating in the test project.
Schneider, K.; Thedford, M. (1986). Evaluation of a Local Air Conditioning Duty Cycling Device as a Load Management Tool. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from