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Initial situation
Consumption : 1 059L of domestic hot water per day
Negative cold : R404a system – Cooling capacity = 2 090W & Heat rejection = 4 179W (at -30/+45°C)
Proposal / study
Equipment for negative cold unit : Boostherm 10kW
Installation of a 1 500L combined storage tank
Forecast return on investment at time of study : 8,7years
Measurements taken
Measurement dates : 03/03/14 to 22/06/16
Average energy recovered per day : 38kWh/day
Annual energy savings : 9 880kWh/year
Total annual savings : approx. €1 208/year, i.e., equiv. to 0,826 tonnes of CO2/year
Actual return on investment : 7,4years