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Initial situation
Consumption : 2 505L of domestic hot water per day
Positive cold : R404a system – Cooling capacity = 12 250W & Heat rejection = 18 550W (at -10/+48°C)
Negative cold : R404a unit – Cooling capacity = 1 400W & Heat rejection = 3 000W (at -30/+45°C)
Proposal / study
Equipment for positive cold unit : Boostherm 20kW
Equipment for negative cold unit : Boostherm 5kW
Installation of a 1 000L combined storage tank
Forecast return on investment at time of study : 4years
Measurements taken
Measurement dates : 20/07/13 to 28/06/16
Average energy recovered per day : 89,6kWh/day
Annual energy savings : 32 704kWh/year
Total annual savings : approx. €3 633/year, i.e., equiv. to 0,668 tonnes of CO2/year
Actual return on investment : 3,7years