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Initial situation
Consumption : 6 273L of domestic hot water per day
Positive cold : R404a system – Cooling capacity = 90 000W & Heat rejection = 126 000W (at -10/+48°C)
Proposal / study
Equipment for positive cold unit : 2 x 70 kW Boostherms, parallel circuit
Installation of a 5 000L buffer tank + a 5 000L electric tank for auxiliary heating
Forecast return on investment at time of study : 3.8years
Measurements taken
Measurement dates: 28/11/17 to 22/01/18
Average energy recovered per day : 167.3 kWh/day
Annual energy savings : 43 491 kWh/year
Total annual savings : approx. €3,914/year, i.e., equiv. to 13.48 tonnes of CO2/year
Actual return on investment : 2.7years