Cambridge cascade
Two Tyneham 290HT 27kW air source heat pumps from Hamworthy Heating have been installed in cascade for underfloor heating in a new extension at a primary school in Cambridge.
To accurately meet the heating requirements of the new school extension and ensure an even distribution of heat, the new system from Hamworthy Heating includes two 290HT 27kW Tyneham heat pumps with natural refrigerant, configured in a hydraulic cascade set up. The heat pumps are connected to a 500L buffer cylinder, which also features an electrical heating element, controlled by a BMS.
This cascade arrangement allows for the heat capacity to be equally distributed according to the specific heating demands of the new school building. Rather than rely on a larger single heat pump that could run inefficiently at partial load, the new cascade set up enables the units, which have inverter controlled compressors, to adjust their capacities as needed which will enable the school to achieve a more accurate match to its actual heating demand and optimise performance.
Additionally, as the new system can adjust to keep the heat pumps operating at their most efficient state, cycling of heat pumps and unnecessary energy consumption is avoided.
