Abstract
In a heat pump dishwasher, the dishware and the dishwater constitute the heat sink and a water tank filled with water, which can freeze, the heat source. A simulation model developed and validated earlier was modified and used in a parameter study to determine the lowest total electricity usage for the refrigerants R134a, R290, and R600a with different cylinder volumes of the compressor. The total equivalent warming impact (TEWI) was calculated in three regions with different CO2 eq. emissions from electricity generation, i.e., Sweden, Europe (OECD), and Europe (Non-OECD), for small, medium-sized, and large households. In regions with low CO2 eq. emissions from electricity generation, the total TEWI of a heat pump dishwasher is the lowest with R600a and the highest with R134a, and in regions with high CO2 eq. emissions, the total TEWI is the lowest with R600a and the highest with the conventional electrical element.
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