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Slide 9: Thermal Storage Details • Think of this as a district heating system for one home; inspiration, thermal storage systems in Denmark. • System operates in many optimization modes • Site operates autonomous with only occasion inputs from utility for temp forecast, prices forecast, op mode, etc. • Variable speed heat pump means 4 kW compressor load can be changed in real-time for inc/dec services without compressor cycling problems • With a CO2 refrigerant heat pump, this system can operate in temperatures to – 5 deg F • At scale, after EE and DR credits, storage cost is about $100/kWh; no in/out losses • Business model: Utility sells therms delivered to tank. Price based on wholesale energy (~3₵) price plus retail distribution costs (4₵) $0.70/therm (wholesale energy can drop to zero during periods of excess wind and solar Slide 10 • Outside heat pump operates per optimization routine set by utility. That is, under a minimize utility cost mode, the outside heat pump will operate primarily during periods of excess wind or solar, or at night. Customer heat pumps in home operate autonomously to meet customer needs. Since tank is pre -heated in winter (pre cooled in summer) customer heat pumps operate with very high COP: 5 to 8. Thus the customer heat pumps use relatively little energy thatcanbesuppliedbythebatteryinvertersystem. Formoreinformation:http://resourcecenter.ieee- pes.org/pes/product/technical-publications/PES_TP_PETSJ-00066-2017_6-18 25PDF Image | Thermal Energy Storage Webinar Series
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