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Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
ME 462/562: Sustainable Energy – an Exergy Analysis Spring 2014
Thermal Energy Storage
Thermal storage 2/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Why thermal storage?● Supply and demand for heat / cool not coincident● Increase in capacity without bigger equipment● Better operation of co-gen plants● Dispatchability of solar thermal electric plants● Shift energy purchase to low-cost period● Increase system reliability● Integration with other functions
Thermal storage 3/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
High-temperature, utility-scale
Thermal storage 4/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Low-temperature, utility-scale
Thermal storage 5/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Low-temperature, residential scale
Thermal storage 6/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Cold storage, commercial
Thermal storage 7/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Residential peak power by end-use
thermal storage can addresspart or all of the cooling load
Thermal storage 8/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
System benefits of thermal storage
peak load
unused baseload
Thermal storage 9/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Thermal storage for trough CSP
Thermal storage 10/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Solana CSP plant (Gila Bend, AZ)● Solar field
● Abengoa solar – Rioglass mirrors – Schott receivers; thermal oil heat medium
● Power block
● 280 MW Rankine-cycle steam turbine with wet cooling and natural gas backup
● Thermal storage
● 2-tank indirect; 6 hours capacity; molten salt
Thermal storage 11/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Storage for power tower CSP
Thermal storage 12/12
Mechanical EngineeringME462/562 Sustainable Energy:
an Exergy Analysis
Gemasolar plant (Seville, Spain)● Solar field
● 2650 x 120 m2 heliostats, 140 m tower, molten salt heat medium 290C to 565C
● Power block
● 19.9 MW Rankine-cycle steam turbine with wet cooling and natural gas backup
● Thermal storage
● 2-tank direct; 15 hours capacity; molten salt
