Analysis of highly-efficient electric residential HPWHs

Baxter, Van D ; Murphy, Richard W ; Rice, C Keith ; Shen, Bo ; Gao, Zhiming

Oak Ridge National Laboratory

关键词: Blowers;    14 Solar Energy;    National Renewable Energy Laboratory;    Viability;    Compressors;   

DOI  :  10.2172/1024282
RP-ID  :  ORNL/TM-2011/278
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  1024282

美国|英语

来源: UNT Digital Library

【 摘 要 】

A scoping level analysis was conducted to identify electric HPWH concepts that have the potential to achieve or exceed 30% source energy savings compared to a gas tankless water heater (GTWH) representative of the type represented in version 0.9.5.2 beta of the BEopt software developed by the National Renewable Energy Laboratory. The analysis was limited to evaluation of options to improve the energy efficiency of electric HPWH product designs currently on the market in the US. The report first defines the baseline GTWH system and determines its efficiency (source-energy-based adjusted or derated EF of ~0.71). High efficiency components (compressors, pumps, fans, heat exchangers, etc.) were identified and applied to current US HPWH products and analyzed to determine the viability of reaching the target EF. The target site-based energy factor (EF) required for an electric HPWH necessary to provide 30% source energy savings compared to the GTWH baseline unit is then determined to be ~3.19.