1 / 11

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.

shiri
Télécharger la présentation

Transient Heat Transfer of Automobile A/C System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related