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For health reasons, public spaces require the continuous exchange of a specified mass of stale indoor airwith fresh outdoor air. To conserve energy during theheating season, it is expedient to recover the thermalenergy in the exhausted, warm indoor air and transferit to the incoming, cold fresh air. A coupled single pass, cross-flow heat exchanger with both fluidsunmixed is installed in the intake and return ducts of aheating system as shown in the schematic. Water containing an anti-freeze agent is used as the workingfluid in the coupled heat exchange device, which iscomposed of individual heat exchangers A and B.Hence, heat is transferred from the warm stale air tothe cold fresh air by way of the pumped water.
Consider a specified air mass flow rate (ineach duct) of
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Fundamentals of Heat and Mass Transfer
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- Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.arrow_forwardWhat is the main difference between a copper and a cupronickel coaxial heat exchanger, and where is each used?arrow_forward
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