Thermal energy storage (TES) is achieved with greatly differing
technologies that collectively accommodate a wide range of needs. It allows
excess thermal energy to be collected for later use, hours, days or many months
later, at individual building, multi-user building, district, town, or even
regional scale depending on the specific technology. As examples: energy demand
can be balanced between daytime and nighttime; summer heat from solar
collectors can be stored inter-seasonally for use in winter; and cold obtained
from winter air can be provided for summer air conditioning. Storage media
include: water or ice-slush tanks ranging from small to massive, masses of
native earth or bedrock accessed with heat exchangers in clusters of
small-diameter boreholes (sometimes quite deep); deep aquifers contained
between impermeable strata; shallow, lined pits filled with gravel and water
and top-insulated; and eutectic, phase-change materials.
Other sources of thermal energy for storage include heat or cold produced with heat pumps from off-peak, lower cost electric power, a practice called peak shaving; heat from combined heat and power (CHP) power plants; heat produced by renewable electrical energy that exceeds grid demand and waste heat from industrial processes. Heat storage, both seasonal and short term, is considered an important means for cheaply balancing high shares of variable renewable electricity production and integration of electricity and heating sectors in energy systems almost or completely fed by renewable energy.
Other sources of thermal energy for storage include heat or cold produced with heat pumps from off-peak, lower cost electric power, a practice called peak shaving; heat from combined heat and power (CHP) power plants; heat produced by renewable electrical energy that exceeds grid demand and waste heat from industrial processes. Heat storage, both seasonal and short term, is considered an important means for cheaply balancing high shares of variable renewable electricity production and integration of electricity and heating sectors in energy systems almost or completely fed by renewable energy.
Approaches to Thermal Energy
Storage
- 1 Solar
energy storage
- 2 Molten
salt technology
- 3 Heat
storage in tanks or rock caverns
- 4 Heat
storage in hot rocks, concrete, pebbles etc
- 5 Electric
thermal storage heaters
- 6 Ice-based
technology
- 7 Cryogenic
energy storage
- 8 Hot
silicon technology
- 9 Pumped-heat
electricity storage
- 10 Endothermic/exothermic
chemical reaction
https://en.wikipedia.org/wiki/Thermal_energy_storage
Footnote on
Endothermic/exothermic chemical reaction text
“Storing energy in molecular bonds is
being investigated.
Energy densities equivalent to lithium-ion batteries have been achieved.”
No comments:
Post a Comment