Experimental investigation on variable speed operation of air conditioning

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dc.contributor.author Grech, N
dc.contributor.author Farrugia, M
dc.date.accessioned 2015-04-28T06:19:12Z
dc.date.available 2015-04-28T06:19:12Z
dc.date.issued 2012
dc.description.abstract Paper presented at the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012. en_ZA
dc.description.abstract Air conditioning installations are typically designed with enough cooling capacity to satisfy the desired minimum temperature under the heaviest load. Since heat loads tend to be less than the maximum designed loads, the system will most often be working under part-load rather than full-load conditions. Operating at these part-load conditions at fixed capacity will be more expensive than if the capacity were able to match the required load. Varying capacity air conditioning systems, which make use of inverter technology, have been developed in order to track the required cooling load more closely. These high quality air conditioners are advertised as consuming around 30 per cent less energy than conventional systems. This experimental investigation looked into the steady state performance and start-up power requirements of an inverter driven refrigeration unit versus fixed speed operation. A three phase (745 W motor) air conditioning laboratory setup was used in direct-on-line (fixed speed) mode and also with a variable frequency drive (inverter). The results obtained showed that the cooling coefficient of performance increased as the operating frequency was reduced. This means that an improved performance can be achieved at lower operating frequencies. A reduced start-up power was required for the inverter driven system, however the additional power requirements for the inverter resulted in the mains driven system being more efficient at full-load conditions. The improved coefficient of performance at lower frequencies resulted in an improved performance for the inverter driven system when compared to a conventional system at part-load conditions. en_ZA
dc.description.librarian dc2014 en_ZA
dc.format.extent 9 pages en_ZA
dc.format.medium PDF en_ZA
dc.identifier.citation Grech, N & Farrugia, M 2012, 'Experimental investigation on variable speed operation of air conditioning', Paper presented to the 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Malta, 16-18 July, 2012. en_ZA
dc.identifier.isbn 9781868549863
dc.identifier.uri http://hdl.handle.net/2263/44851
dc.language.iso en en_ZA
dc.publisher International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics en_ZA
dc.relation.ispartof HEFAT 2012 en_US
dc.rights University of Pretoria en_ZA
dc.subject Air conditioning en_ZA
dc.subject Air conditioning installations en_ZA
dc.subject Cooling capacity en_ZA
dc.subject Heat loads en_ZA
dc.subject Part-load conditions en_ZA
dc.subject Variable frequency drive en_ZA
dc.subject Cooling coefficient of performance en_ZA
dc.title Experimental investigation on variable speed operation of air conditioning en_ZA
dc.type Presentation en_ZA


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