Journal
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
Volume 45, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seta.2021.101113
Keywords
Solar-powered heat pumps; Variable-speed compression air-conditioning system; Thermodynamic analysis; Peak shaving; Economic evaluation
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The study found that under PV-powered conditions, variable-speed compression heat pumps are more efficient than fixed-speed compression systems, requiring a smaller PV system size and providing more cooling and heating capacity. Economic evaluation shows that using variable-speed compression heat pumps powered by PV systems is more energy-efficient compared to fixed-speed compression systems.
Y The present study aimed at finding which kind of the two available commercial heat pump types (i.e. the variable-speed and fixed-speed compression systems) would be the appropriate option to become fully photovoltaic (PV)-powered, especially for the office building sector. First, behaviors of the heat pumps are determined based on experimental thermodynamic analyses using T-s (temperature-entropy) cycles. Results reveal that the variable-speed compression system shows up to 400% higher efficiencies under partial loads. The minimum PV systems required for these two systems for 8 working hours (9:00-17:00) in the Tehran climate are designed. The results show that the fixed-speed compression system requires a minimum size of a PV power system twice that of the variable-speed compression counterpart. With the half-sized PV system, the variable-speed compression airconditioner provides 64% and 88% of the heat and cold of the fixed-speed counterpart, respectively. The economic evaluation shows that it provides 50% and 16% extra cooling and heating compared to those of the fixedspeed counterpart per invested US $. Hence, applying variable-speed compression heat pumps powered by PV systems would be one of the most promising methods for peak-shaving, especially for high cooling demands and in the office building sector.
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