A numerical simulation study of a new environmental chamber

Chatzidakis, SK; Athienitis, AK; Chatzidakis, KS

dc.contributor.author	Chatzidakis, SK	en
dc.contributor.author	Athienitis, AK	en
dc.contributor.author	Chatzidakis, KS	en
dc.date.accessioned	2014-03-01T02:49:12Z
dc.date.available	2014-03-01T02:49:12Z
dc.date.issued	2002	en
dc.identifier.issn	00012505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34401
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0036459264&partnerID=40&md5=1f8d5bedae78e6041a5cdd6a0ae47c88	en
dc.subject.other	Algorithms	en
dc.subject.other	Atmospheric humidity	en
dc.subject.other	Heating	en
dc.subject.other	Refrigerants	en
dc.subject.other	Heating systems	en
dc.subject.other	Environmental chambers	en
dc.title	A numerical simulation study of a new environmental chamber	en
heal.type	conferenceItem	en
heal.publicationDate	2002	en
heal.abstract	This paper describes a numerical simulation study of a new environmental chamber recently constructed in Athens for the testing of special equipment for carriage of perishable foodstuff as specified in the United Nations ATP agreement. A transient finite difference model is developed for the chamber and a typical specimen refrigerated truck to be tested. Proportional-integral control is employed for control of the cooling/ heating system. The impact of various parameters on the time required to reach the setpoint temperature (tset) is investigated. Specifically, the impact of specimen insulation thickness and the thickness of the chamber concrete floor are considered in detail. The impact of modeling detail is also investigated by considering two lumped layers for the floor versus four layers. The time tset, which is initially about 1.5 hours, increases by approximately 10% when the concrete floor thickness is increased from 10 cm to 30 cm for typical initial conditions and desired chamber and specimen temperatures of 32.5°C and 7.5°C, respectively. The specimen insulation thickness has a significant impact-reducing the insulation U-factor from 1 to 0.2 W/(m2K) reduces the time required tset by about 16%.	en
heal.journalName	ASHRAE Transactions	en
dc.identifier.volume	108 PART 2	en
dc.identifier.spage	113	en
dc.identifier.epage	118	en