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Transient Heat Transfer of Automobile A/C System

Transient Heat Transfer of Automobile A/C System. August 29, 2005. Prepared by: Jason Hixson, Don Scott, and Michael Hickey. A/C Schematic. R-134a. R-134a. M 4 ,T 4. M 3 ,T 3. Cooled Air. Recycled Air. M 2 ,T 2. M 1 , T 1.

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Transient Heat Transfer of Automobile A/C System

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  1. Transient Heat Transfer of Automobile A/C System August 29, 2005 Prepared by: Jason Hixson, Don Scott, and Michael Hickey

  2. A/C Schematic R-134a R-134a M4,T4 M3,T3 Cooled Air Recycled Air M2,T2 M1, T1

  3. Objectives • Measure temperatures & velocities of cooled air. • Perform material and energy balance. • Measure temperature of recycled air. • Make estimates of coolant temperatures. • Make estimates of air volume in car. • Observe pseudo steady-state transient behavior.

  4. The Energy Balance: Air Side: ∆H=m2*Cp(T2-T1) ∆H=UA ∆Tlm Refrigerant Side: ∆H=m3(H4-H3)

  5. Variables & Assumptions • Cp=1.004 kJ/kg*K • H3=17.14 kJ/kg • H4=234.15 kJ/kg • T3=T4=40 °C • Entrance temperature • Exit temperature • Fan speed • Velocity • Engine RPM • Time

  6. Fan setting 4 was unable to lower car temperature. R-134a mass flow rate is dependant on engine rpm. Air mass flow rate is not affected by engine rpm. Cab volume=2.3 m3 Traveling at 2000 rpm, maximum heat transfer will occur at fan setting 3 where: UA=0.3 kJ/°C m1=0.13 kg/s Quick Facts

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