Development of an Advanced Heating Sectin for Ultrahigh Efficiency Commercial Rooftop Air Conditioning Package. Topical Report July 1986-July 1988

摘要

Two engineering models of high-efficiency heating sections for a commercial rooftop heating/cooling system were developed, fabricated and evaluated. Each engineering model used a different combustion technology. A variable rate pulse combustion heating section operated satisfactorily over a range of 42% to 127% (96,600 to 292,000 Btu/hr) of its normal input rate of 230,000 Btu/hr. This variable rate unit exceeded program goals, which anticipated only a dual rate pulse combustion model and had a steady state efficiency of 91.9% at 100% input rate and 97.3% at 50% input rate. A secondary heat exchanger was also successfully added to the heating section of a conventional rooftop unit employing tubular heat exchangers. This modified conventional unit had a steady-state efficiency of 93.5% at 100% input rate and 92.2% at 50% rate.