Air and refrigerant R22 pass through a heat exchanger in two separate streams. Assume no heat transfer to the surroundings from the heat exchanger (so, all heat transfer occurs only between the fluids), work is zero, and negligible kinetic energy change. The refrigerant's inlet and outlet locations are separated by 1 meter height, so there will be potential energy change! Air: Inlet 1: temperature 27C, pressure 1.1 bar. R22 Outlet 2: temperature 15C, pressure 1 bar (there is a pressure drop in the heat exchanger) Inlet 3: pressure 7 bars, x=0.16 (gas+liquid) Outlet 4: Pressure 7 bar, temperature 15C. See the sketch of the heat exchanger below. Place all parameters at the inlets and outlets to visualize the process: R22 Air Air Determine: a.Mass flow rate ratio of the air to R22 [kg/s] b.Determine the heat transfer rate [W] from one fluid to another. 3 R22

Air and refrigerant R22 pass through a heat exchanger in two separate streams. Assume no heat transfer to the surroundings from the heat exchanger (so, all heat transfer occurs only between the fluids), work is zero, and negligible kinetic energy change. The refrigerant's inlet and outlet locations are separated by 1 meter height, so there will be potential energy change! Air: Inlet 1: temperature 27C, pressure 1.1 bar. R22 Outlet 2: temperature 15C, pressure 1 bar (there is a pressure drop in the heat exchanger) Inlet 3: pressure 7 bars, x=0.16 (gas+liquid) Outlet 4: Pressure 7 bar, temperature 15C. See the sketch of the heat exchanger below. Place all parameters at the inlets and outlets to visualize the process: R22 Air Air Determine: a.Mass flow rate ratio of the air to R22 [kg/s] b.Determine the heat transfer rate [W] from one fluid to another. 3 R22

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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3.24 You want to cool air from 150°C to 60°C but you cannot afford a custom-built heat exchanger. You find a used cross-flow exchanger (both fluids unmixed) in storage. It was previously used to cool 136 kg/min of NH3 vapor from 200°C to 100°C using 320 kg/min of water at 7°C; U was previously 480 W/m²K. How much air can you cool with this exchanger, using the same water supply, if U is approximately unchanged? (Actually, you would have to modify U using the methods of Chapters 6 and 7 once you had the new air flow rate, but that is beyond our present scope.)
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