Dusseldorf, Germany. ACKNOWLEDGMENT Authors would like to acknowledge the contributions by Danfoss HX test labs in Haiyan, China
- R. for HVAC
- 16th International Refrigeration and Air…
An innovative way of integrating microchannel condensers in modular chillers and rooftop air conditioners is presented in this paper. The geometrical characteristics of the heat exchanger and how it can be incorporated into commercial air conditioners is discussed. Details are given on the performance analysis of the heat exchanger under typical chiller operating conditions. A simulation study is presented comparing the proposed coil and the conventional microchannel coil. Analysis shows that the new heat exchanger increases the capacity of a typical chiller condenser by 20% at same foot print. When operated using the same fan as baseline, for the same capacity the new heat exchanger resulted in a 2 oC drop in condensing temperature. Testing was performed at a small scale coils to validate the gains predicted by the simulation. The testing showed that the new heat exchanger can deliver a 26% higher heat rejection rate. At same heat rejection rate the testing showed that the new heat exchanger operated at 1.9 oC lower condensing temperature.