Summary
A transient model for air-cooled, direct expansion cooling equipment was developed that runs faster than real time and handles the thermal and refrigerant flow transients associated with on/off compressor control. The model involves the solution of a set of first-order differential equations that arise from mass and energy conservation. The state variables include refrigerant pressures and enthalpies and temperatures of solid material. A novel method for handling the start up and shut down transients was developed. The model was validated using measurements for a 3-ton (10.6 kW) rooftop air conditioner.
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Details
- Original title: A real-time transient model for air conditioners.
- Record ID : 2000-1518
- Languages: English
- Source: 20th International Congress of Refrigeration: Refrigeration into the Third Millennium.
- Publication date: 1999/09/19
Links
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Indexing
- Themes: Other air-conditioning equipment
- Keywords: Operation; Air conditioner; Transient state; Simulation; Air conditioning
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Improved methodologies for simulating unitary a...
- Author(s) : SHEN B., BRAUN J. E., GROLL E. A.
- Date : 2009/11
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 7
- Formats : PDF
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Fault diagnosis and temperature sensor recovery...
- Author(s) : LEE W. Y., HOUSE J. M., SHIN D. R.
- Date : 1997
- Languages : English
- Source: ASHRAE Transactions.
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Operating and maintaining rooftop air condition...
- Author(s) : HOUGHTON D.
- Date : 1997/12
- Languages : English
- Source: ASHRAE Journal - vol. 39 - n. 12
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Common faults and their impacts for rooftop air...
- Author(s) : BREUKER M. S., BRAUN J. E.
- Date : 1998/07
- Languages : English
- Source: HVAC&R Research - vol. 4 - n. 3
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Performance factors as a basis of practical fau...
- Author(s) : KÄRKI S. H., KARJALAINEN S. J.
- Date : 1999
- Languages : English
- Source: ASHRAE Transactions. 1999 Winter Meeting, Chicago, Illinois + CD-ROM.
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