HEAT NETWORKS | INTEGRATING HEAT PUMPS Heat pumps are an expensive technology; an ASHP is likely to cost 500-800/kW of capacity Thermal storage: heat pumps best friend thermal 1200 Site demand (kW) 1000 800 600 400 200 0 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 Cumulative number of hours per year spent at or above a given site demand An exciting time to be in heat networks 1200 Site demand (kW) 1000 800 600 400 200 0 0 1000 2000 3000 4000 5000 6000 7000 8000 Cumulative number of hours per year spent at a or above a given site demand CJ 9000 MICHAEL RIDGE is principal engineer at FairHeat To read more on heat-pump selection and air source v ground source heat pumps, read this article at cibsejournal.com 38 May 2021 www.cibsejournal.com CIBSE May 21 pp36-38 CHP to Heat Pumps.indd 38 23/04/2021 18:10