Fourteen months operation of a 200 kWh latent heat storage pilot

A latent heat storage was in 2021 installed in an office building in Trondheim, Norway. The unit contains 3 tons of CrodaTherm 37, which is a bio-based wax phase-change material with a melting temperature of 37 degrees Celsius. The thermal energy storage can be charged from heat pumps or district heating and can be discharged to domestic hot water, radiators, ventilation, or heat pumps. This unit has been collecting data on operations for over 14 months. The total thermal energy capacity was measured to be 226 kWh, and the average discharge rate over 12.2 hours of 10.51 kW and average charge rate over 11 hours of 13.7 kW was measured. An average temperature reduction of 47.3 to 38 Celsius over 234 hours during storage was measured. The average heat loss was measured to be 64 W, or 0.68% of the total capacity per day.