A-16 A Study on the Energy Efficiencies of Water Heater for Household Use in a Cold District : (Part1) Energy Efficiencies of Condensing Type Gas Water Heater and CO_2 Heat Pump Water Heater

Abstract

The authors analyzed the primary energy consumption and the mean of CO_2 emission in comparing the condensing type gas water heater with the CO_2 heat pump water heater in a cold district. The performance of each water heaters was investigated in the same home with changing them in turn. The mean of energy efficiency was 0.85 in the case of condensing type gas water heater, and it was 0.61 in the case of CO_2 heat pump water heater. The primary energy consumption of the gas water heater was less than the CO_2 heat pump water heater, and energy efficiency was higher.