The Annex 58 high-temperature heat pump project has reviewed systems supplying temperatures over 100°C and found refrigerants like CO2, water, hydrocarbons, helium and ammonia being used.
The heat pump from Danish OEM Advansor will replace 250 oil and gas boilers, and cut an estimated 1,200 metric tons of CO2e emissions per year.
Generating hot water up to 70°C, the heat pump is designed to replace fossil fuel furnaces.
The heat pump, using Vilter’s high-pressure single-screw compressor, has completed more than 6,700 hours of testing.
The AC540 brazed-plate heat exchanger family is designed to minimize the evaporator’s refrigerant charge and reduce the pressure drop on the secondary side, saving energy.
Adelaide contractor Jonathen Hindry attributes the growth to increased environmental awareness and high rate of solar PV systems in homes, which can be utilized to run the heat pumps.
The third high-temperature heat pump symposium will include presentations, panels and site visits, in Copenhagen on March 29-30.
The heat pump can replace a gas boiler in an existing home without expensive retrofitting, says Vattenfall.
The heating capacity and COP of CO2 heat pumps can decrease more then 25% during defrost, but optimal defrost can lower this to less than 10%, says Fenagy.
Electrification of buildings is expected to grow demand for heat pumps, which are currently HFC-based, according to CARB.
