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Initial situation
Consumption : 1 215L of domestic hot water per day
Negative cold : 2 x R404a systems – Cooling capacity = 2 581W & Heat rejection = 5 456W (at -30/+45°C)
Proposal / study
Equipment for negative cold unit : 2 x 10 kW Boostherms
Installation of a 1 000L buffer tank
Forecast return on investment at time of study : 3.5years
Measurements taken
Measurement dates : 20/08/14 to 20/07/17
Average energy recovered per day : 48.8 kWh/day
Annual energy savings : 17 812 kWh/year
Total annual savings : approx. €1,959/year, i.e., equiv. to 6.87 tonnes of CO2/year
Actual return on investment : 3.3years