Reports investigation of the limiting conditions that produce frosting on air-to-air heat exchangers. Also determines the adequacy of provisions for the prevention of frosting and ice buildup. Four types of heat exchanger were investigated as part of a more general investigation of the operating characteristics of air-to-air heat exchangers. Also reports investigation for various types of energy recovery systems of the cross leakage or contamination of the fresh air by the exhaust air.
Describes and discusses the principles, advantages and disadvantages of several types of air-to-air energy recovery devices, including the open and closed run-around systems; the heat pipe exchanger; the thermal wheel and the heat exchanger. Places emphasis on the potential energy savings in heating and cooling equipment and fuel costs by recovering energy from exhaust air before it is thrown away. Results indicate annual energy savings of up to 23% with even larger savings in the size of the heating and cooling equipment.
Gives a general description of air-to-air heat exchangers. Discusses criteria for measuring the performance of heat exchangers. Briefly discusses factors affecting actual performance. Describes the heat exchanger facility atLawrence Berkeley Laboratory. Reports tests on four commercially available heat exchangers and one home-made exchanger. Gives results of tests of effectiveness and airstream static pressure drop. Concludes that heat exchangers with performance characteristics superior to those tested can be manufactured for a reasonable cost.
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