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Cycling in Climate Control Systems with Orifice Tube and Thermostatic Expansion Valve
Technical Paper
2007-01-1195
ISSN: 0148-7191, e-ISSN: 2688-3627
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Language:
English
Abstract
Automotive climate control systems are typically equipped with either an orifice tube or a thermostatic expansion valve. The two devices behave differently especially during cycling operation. The variable restriction of the thermostatic expansion valve delays the refrigerant migration when the clutch is disengaged and allows a faster redistribution when the clutch is engaged. The effect of cycling on the performance of two climate control systems, one with a short-tube orifice, and the other with a thermostatic expansion device, was investigated. The cycle period was varied from 10 seconds to 6 minutes. The test results show the change in moisture removal rate, latent capacity, sensible capacity, energy consumption, and coefficient of performance due to cycling. It is shown that the penalty in energy consumption due to cycling depends on the cycle period.
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Authors
Topic
Citation
Hwang, Y., Gado, A., and Radermacher, R., "Cycling in Climate Control Systems with Orifice Tube and Thermostatic Expansion Valve," SAE Technical Paper 2007-01-1195, 2007, https://doi.org/10.4271/2007-01-1195.Also In
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
References
- Park, Y.C. McEnaney R. Boewe D. Yin J.M. Hrnjak P.S. 1999 “Steady State and Cycling Performance of a Typical R134a Mobile A/C System,” SAE paper number 1999-01-1190
- Ratts, E.B. Brown J.S. 2000 “An Experimental Analysis of Cycling in an Automotive Air Conditioning System.” Applied Thermal Engineering 20 1039 1058
- Henderson, H. I. Shirey D.B. Raustad R.A. 2003 “Understanding the Dehumidification Performance of Air-Conditioning Equipment at Part Load Conditions,” CIBSE/ASHRAE Conference Scotland
- Gado, A. Hwang, Y. Radermacher, R. 2004 “Measurements of the dynamic performance and behavior of air-conditioning systems using a dynamic test facility.” Proceedings of the Tenth International Refrigeration and Air Conditioning Conference at Purdue, paper number R106