Abstract
Two counter-flow parallel plate air-to-air heat exchangers were studied under cold weather conditions in theventilation system of swine facilities at North Dakota State University. The efficiency and the heat recovery of both heatexchangers increased as outside air temperature decreased and the temperature change in the cold air stream increased.Maximum measured efficiency was 49%. Condensation on the warm side of the heat exchanger resulted in increasedefficiency. Condensation in a farrowing room heat exchanger released a maximum of 3.1 kW (10,500 Btu/h). Dustaccumulation on a nursery room heat exchanger plates caused a decrease of the overall heat transfer coefficient from6.87 to 5.90 W/m2-K [1.2 to 1.04 Btu/(h- ft2-F)]. The overall heat transfer coefficient dropped from 5.0 W/m2K[0.88 Btu/(h-ft2-F)] to 3.1 W/m2K [0.54 Btu/(h-ft2-F)] in the farrowing room heat exchanger when the cold air streamfan was on and off, respectively.
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