Initial situation
Consumption : 743L 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 : 10 kW Boostherm
Installation of a 500L combined storage tank
Forecast return on investment at time of study : 4.7years
Measurements taken
Measurement dates : 23/12/13 to 13/06/16
Average energy recovered per day : 31.6 kWh/day
Annual energy savings : 11 471 kWh/year
Total annual savings : approx. €1,377/year, i.e., equiv. to 4.18 tonnes of CO2/year
Actual return on investment : 4.6years