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Initial situation
Consumption : 1 952L of domestic hot water per day
Negative cold : R404a system – Cooling capacity = 3 360W & Heat rejection = 6 450W (at -30/+45°C)
Proposal / study
Equipment for negative cold unit : Boostherm 10kW
Installation of a 1 000L combined storage tank
Forecast return on investment at time of study : 3,4years
Measurements taken
Measurement dates : 23/03/17 to 29/08/17
Average energy recovered per day : 76,8kWh/day
Annual energy savings : 27 878kWh/year
Total annual savings : approx. €3 345/year, i.e., equiv. to 8,64 tonnes of CO2/year
Actual return on investment : 2,9years