Computational energy analysis of an innovative isothermal chamber for testing of the special equipment used in the transport of perishable products

Chatzidakis, SK; Athienitis, A; Chatzidakis, KS

dc.contributor.author	Chatzidakis, SK	en
dc.contributor.author	Athienitis, A	en
dc.contributor.author	Chatzidakis, KS	en
dc.date.accessioned	2014-03-01T01:20:01Z
dc.date.available	2014-03-01T01:20:01Z
dc.date.issued	2004	en
dc.identifier.issn	0363-907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15815
dc.subject	Algorithms	en
dc.subject	ATP agreement	en
dc.subject	Environmental test station	en
dc.subject	Heating	en
dc.subject	Refrigerated transport	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.other	Computer simulation	en
dc.subject.other	Energy utilization	en
dc.subject.other	Food products	en
dc.subject.other	Numerical methods	en
dc.subject.other	Specific heat	en
dc.subject.other	Testing	en
dc.subject.other	Computational energy analysis	en
dc.subject.other	Proportional-integral control	en
dc.subject.other	Refrigeration	en
dc.subject.other	testing method	en
dc.title	Computational energy analysis of an innovative isothermal chamber for testing of the special equipment used in the transport of perishable products	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/er.1003	en
heal.identifier.secondary	http://dx.doi.org/10.1002/er.1003	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	This paper describes an improved numerical simulation study of an isothermal chamber recently constructed at Zografou Campus of the National Technical University of Athens (NTUA) for the testing of special equipment used for transporting perishable foodstuffs in accordance with the United Nations ATP agreement. Using a transient finite difference model, a simulation is developed for a modern ATP test chamber and a typical specimen refrigerated vehicle to be tested. The simulation results are compared to experimental measurements taken under real conditions by a data acquisition system and a refrigerated semitrailer as specimen. Proportional-integral control is employed for the regulation of the cooling and heating system. The impact of various parameters on the time required to reach the set-point temperature (is,,) is investigated and the energy consumption is simulated for a period of 22h. In particular, the impact of specimen insulation thickness and the thickness of the chamber insulation floor are considered in detail. The total energy consumption increases by approximately 16% when the concrete floor layer thickness is increased from 8 to 16cm for typical initial conditions and desired chamber and specimen temperatures of 32.5 and 7.5degreesC, respectively. Using a floor insulation of 6cm extruded heavy strain-resistant polystyrene reduces the energy consumption by at least 13%. Specimen insulation thickness increase from U-value of 0.35Wm(-2) K to 0.75 W m(-2) K result to an increase in energy consumption by a percentage of 28%. Thermal capacity, temperature of car body and specimen dimensions are also treated as variables that affect the total duration of an ATP test and its total energy consumption. Copyright (C) 2004 John Wiley Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.doi	10.1002/er.1003	en
dc.identifier.isi	ISI:000223092200004	en
dc.identifier.volume	28	en
dc.identifier.issue	10	en
dc.identifier.spage	899	en
dc.identifier.epage	916	en