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Initial situation
Consumption : 8 336L of domestic hot water per day
Positive cold : R404a system – Cooling capacity = 200 000W & Heat rejection = 300 000W (at -10/+48°C)
Proposal / study
Equipment for positive cold unit : 2 x 70 kW Boostherms, branch circuit
Installation of 2 x 2 000L buffer tanks upstream from a 1 500L electric water heater
Forecast return on investment at time of study : 2.2years
Measurements taken
Measurement dates : 17/09/15 to 10/05/17
Average energy recovered per day : 366.3 kWh/day
Annual energy savings : 98 901 kWh/year
Total annual savings : approx. €8,901/year, i.e., equiv. to 30.66 tonnes of CO2/year
Actual return on investment : 2.1years