Initial situation
Consumption : 8 000L of domestic hot water per day
Water-cooled condensation system consuming over 2 000m3 of water per year
Recent hot water preheaters and storage
Negative cold : R404a unit – Cooling capacity = 1 200W & Heat rejection = 2 123W (at -30/+45°C)
Positive cold : R134a system – Cooling capacity = 24 000W & Heat rejection = 37 040W (at -10/+48°C)
Proposal / study
Equipment for negative cold unit : Boostherm 5 kW
Equipment for positive cold unit : Boostherm 70 kW
Reuse of storage in place
Forecast return on investment at time of study : 1.4years
Measurements taken
Measurement dates : 02/11/15 to 10/06/16
Average energy recovered per day : 154.7 kWh/day
Annual energy savings : 56 466 kWh/year
Saving in water for condensation system (not measured) : 2 000 m3/an (assessment)
Total annual savings : approx. €10,523/year, i.e., equiv. to 30.6 tonnes of CO2/year
Actual return on investment : 0.9years