Parametric analysis of space cooling systems based on night ceiling cooling with PCM-embedded piping

Tzivanidis, C; Antonopoulos, KA; Kravvaritis, ED

dc.contributor.author	Tzivanidis, C	en
dc.contributor.author	Antonopoulos, KA	en
dc.contributor.author	Kravvaritis, ED	en
dc.date.accessioned	2014-03-01T02:11:55Z
dc.date.available	2014-03-01T02:11:55Z
dc.date.issued	2012	en
dc.identifier.issn	0363907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29971
dc.subject	Cool storage	en
dc.subject	Night ceiling cooling	en
dc.subject	Parametric analysis	en
dc.subject	PCM	en
dc.subject	PCM-embedded piping	en
dc.subject	Phase change materials	en
dc.subject	Space cooling	en
dc.subject.other	Cold waters	en
dc.subject.other	Cool storage	en
dc.subject.other	Daily peak load	en
dc.subject.other	Electricity prices	en
dc.subject.other	Electricity-consumption	en
dc.subject.other	Finite-difference solution	en
dc.subject.other	Layer thickness	en
dc.subject.other	Low energy consumption	en
dc.subject.other	Main parameters	en
dc.subject.other	Parametric analysis	en
dc.subject.other	PCM-embedded piping	en
dc.subject.other	Phase Change	en
dc.subject.other	Phase change process	en
dc.subject.other	Phase change temperature	en
dc.subject.other	Structural layers	en
dc.subject.other	Water inlets	en
dc.subject.other	Ceilings	en
dc.subject.other	Cooling	en
dc.subject.other	Embedded systems	en
dc.subject.other	Energy utilization	en
dc.subject.other	Phase change materials	en
dc.subject.other	Pulse code modulation	en
dc.subject.other	Thermal comfort	en
dc.subject.other	Thermal conductivity	en
dc.subject.other	Thermoelectric equipment	en
dc.subject.other	Cooling systems	en
dc.title	Parametric analysis of space cooling systems based on night ceiling cooling with PCM-embedded piping	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/er.1777	en
heal.identifier.secondary	http://dx.doi.org/10.1002/er.1777	en
heal.publicationDate	2012	en
heal.abstract	A parametric analysis is conducted for space cooling systems based on cold water flowing, during the night, within regularly arranged pipes embedded in a layer of phase change material (PCM), located among the structural layers of the ceiling. The introduced PCM layer in conjunction with night cooling add to the usual ceiling cooling systems offers the advantages of low energy consumption, high cool storage capacity, operation under reduced night electricity price, smoothing of electricity consumption by eliminating daily peak loads, improved thermal comfort and elimination of ceiling dripping. Our parametric analysis is based on a transient three-dimensional finite-difference solution of the related heat-transfer problem for various values of all the main system parameters. PCM phase change process is simulated by using the effective thermal capacity function, which is determined experimentally for PCM suitable for air-conditioning applications. Our tests showed that the main parameters of the system are pipe spacing, PCM layer thickness, pipe depth within the ceiling, cooling water inlet temperature, night cooling duration and PCM properties (thermal conductivity, phase change heat and ends of phase change temperature range). The effect of all the above parameters is analysed and suggestions are made for selecting the proper combinations of their values in order to obtain the lowest energy consumption in conjunction with the highest level of thermal comfort. © 2010 John Wiley & Sons, Ltd.	en
heal.journalName	International Journal of Energy Research	en
dc.identifier.doi	10.1002/er.1777	en
dc.identifier.volume	36	en
dc.identifier.issue	1	en
dc.identifier.spage	18	en
dc.identifier.epage	35	en