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Daikin tailors its Altherma system for apartments and community heating
Published:  07 July, 2010
Daikin, altherma, space heating

A version of Daikin’s Altherma system for apartment buildings and community heating can deliver flow temperatures of 80°C for heating and achieve DHW temperatures of up to 70°C. COPs are up to 3.5. Cooling is also an option, with leaving water temperatures down to 5°C. Outdoor units use R410A and offer heating outputs from 23 to 45 kW; they can be grouped for higher outputs.

Compared with individual gas-fired boilers, a 27% reduction in primary energy use is claimed, along with 59% lower CO2 emissions and 33% lower operating costs.

A small indoor unit in each dwelling receives heat from the central outdoor unit and boosts its temperature further using a cascade heat pump on R134a to serve underfloor heating, radiators or heat-pump convectors as required. The indoor unit can include an optional 200 l DHW cylinder storing water at 70°C and thus able to deliver 400 l at 40°C. There are two sizes of indoor unit — 6 and 9 kW.

Connections between indoor and outdoor units are by small-diameter refrigerant piping. Buildings up to 50 m high can be served, assuming the outdoor units are on the roof.

Each apartment has an intelligent user interface with optional wired or wireless room thermostats. Features include weather-dependent setpoint and room-temperature compensation.