A finned-tube heat exchanger is used as an air-conditioning condenser. During a steady state operation, refrigerant in the tubes remains 2-phase state throughout the heat exchanger at the condensing temperature 67 °C. Air enters the condenser at inlet temperature 22 °C and air mass flow rate is 0.7 kg/s. Refrigerant-side convection thermal resistance and tube wall conduction resistances are negligible. Airside total surface area is 8 m² and overall surface efficiency is 0.75. Airside average convection coefficient is 102 W/(m²K). The specific heat of air is 1,006 J/(kgK). Determine the heat transfer rate in W.

A finned-tube heat exchanger is used as an air-conditioning condenser. During a steady state operation, refrigerant in the tubes remains 2-phase state throughout the heat exchanger at the condensing temperature 67 °C. Air enters the condenser at inlet temperature 22 °C and air mass flow rate is 0.7 kg/s. Refrigerant-side convection thermal resistance and tube wall conduction resistances are negligible. Airside total surface area is 8 m² and overall surface efficiency is 0.75. Airside average convection coefficient is 102 W/(m²K). The specific heat of air is 1,006 J/(kgK). Determine the heat transfer rate in W.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.49P

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

A finned-tube heat exchanger is used as an air-conditioning condenser. During a
steady state operation, refrigerant in the tubes remains 2-phase state throughout the
heat exchanger at the condensing temperature 67 °C. Air enters the condenser at inlet
temperature 22 °C and air mass flow rate is 0.7 kg/s. Refrigerant-side convection
thermal resistance and tube wall conduction resistances are negligible. Airside total
surface area is 8 m² and overall surface efficiency is 0.75. Airside average convection
coefficient is 102 W/(m²K). The specific heat of air is 1,006 J/(kgK). Determine the
heat transfer rate in W.

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