Sunday, February 24th, 2019

Comparative field performance study of flat plate and heat pipe evacuated tube collectors (ETCs) for domestic water heating systems in a temperate climate

Publication year: 2011brbSource:/b Energy, In Press, Corrected Proof, Available online 11 April 2011brL.M., Ayompe , A., Duffy , M., Mc Keever , M., Conlon , S.J., McCormackbrThis paper presents a year round energy performance monitoring results of two solar water heaters with 4m2 flat plate and 3m2 heat pipe evacuated tube collectors (ETCs)operating under the same weather conditions in Dublin, Ireland. The energy performance of the two systems was compared on daily, monthly and yearly basis. Results obtained showed that for an annual total in-plane solar insolation of 1087kWhm−2, a total of 1984kWh and 2056kWh of heat energy were collected by the 4m2 FPC and 3m2 ETC systems respectively. Over the year, a unit area of the FPC and ETC each generated 496kWhm−2 and 681kWhm−2 of…br Highlights: ► Two domestic scale SWHs with evacuated tube and flat plate collectors (FPCs) were tested under the same conditions. ► The annual average collector efficiencies were 46.1% and 60.7% for the flat plate and evacuated tube collectors respectively. ► System efficiencies were 37.9% and 50.3% for the flat plate and ETCs respectively. ► Simple payback periods (SPPs) varied between 13 years and 48.5 years depending on the type of auxiliary heating system considered.

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