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Initial situation
Consumption : 1 033L of domestic hot water per day
Negative cold : R404a system – Cooling capacity = 2 800W & Heat rejection = 5 320W (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 : 4.6years
Measurements taken
Measurement dates : 02/04/15 to 27/11/15
Average energy recovered per day : 58,7kWh/day
Annual energy savings : 21 308kWh/year
Total annual savings : approx. €2 557€/year, i.e., equiv. to 6,61 tonnes of CO2/year
Actual return on investment : 2,9years