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Initial situation
Consumption : 1 300L of domestic hot water per day
Negative cold : R449a system – Cooling capacity = 16 300W & Heat rejection = 28 800W (at -30/+45°C)
Proposal / study
1x 60kW heat recovery system for evaporator defrosting + 1 x 70kW system for domestic hot water production
1 x 1 000L for warm glycol storage + 1 x 1 500L for domestic hot water storage
Measurements taken
Average energy recovered per day : 500kWh/day
Annual energy savings : 129 967kWh/year
Total annual savings : approx. €6,291/year, i.e., equiv. to 15.95 tonnes of CO2/year
Actual return on investment : 3.4years