EnergiVault® has developed and patented a unique thermal phase change battery technology to provide Cold Thermal Energy Storage (CTES) solutions. Initially focusing on decarbonising chilled supply chain (food manufacturing, distribution, food retail), the technology can be applied across industrial refrigeration, air-conditioning and refrigerated transport systems.
The EnergiVault technology is a thermal storage system providing cooling support to existing or new working fluid based cooling systems. It can be sized for short or long daily charging and can deliver very high cooling rates many times the charge rate. For example, a 1MWht thermal store can be charged over 16 hours using a small charger of c. 65kWt and discharged at a cooling rate of 1MW in an hour, or 500kW for 2 hours.
The EnergiVault technology comprises the EnergiVault Crystalliser module comprising a condensing unit sized for the charge rate, an ice slurry crystalliser, charging pump and control module. In addition to the Crystalliser module is the EnergiVault thermal store or battery module which comprises the thermal storage vessel or vessels, charge quantification device, cooling pump and 3-way valve to control the delivery of cooling.
Modes of operation
The cooling support is provided once the controller sees the returning working fluid deviating from the set point, modulating a diverting valve to allow the working fluid to be cooled by the EnergiVault Thermal bank.
More sophisticated modes of operation including dynamic charging based on energy price signals, with additional cooling support available when primary chillers are switched off or their capacity is exceeded.
As the proportion of untimetabled renewable energy being fed into the National Grid increases, the problem of balancing electrical supply and demand becomes more acute. This occurrence has negative implications for energy sustainability, affordability, and security.
EnergiVault Thermal Energy Storage (TES) is the smartest cooling technology available, complementing and supporting the ever increasing uptake of unpredictable renewables.
How does EnergiVault unlock value?
Get an understanding of EnergiVault’s concept
What is Unique
The effectiveness of thermal energy storage is ALWAYS dependant on the volume and speed of energy transfer between the stored energy (bank), and its recipient
EnergiVault is connected to existing secondary cooling circuits without a conventional heat exchanger, using the same working fluid throughout.
The EnergiVault thermal battery acts as an “organic” heat exchanger, with working fluid entering the thermal battery being “chilled” and fluid drawn off the base of the battery.
The heat exchange surface area within the battery (i.e.the micro sized crystals of the working fluid) increases as the charge increases.
The ”organic” heat exchanger has vast surface area, ever increasing in size as more spherical ice particles are created.
This enables support of massive cooling loads.
How Thermal Exchange Occurs conventionally?
Thermal exchange occurs through a “heat exchanger” and usually takes the form of :
Tube in tube – Where contra-flowing fluids exchange their thermal energy through the wall of concentric pipes, usually in a coiled form.
Shell and Tube – Where thermal exchange is accomplished through a bundle of enclosed tubes.
Plate – Where dissimilar fluids occupy both sides of a matrix of plates.
Conventional Heat Exchangers:
- Conventional heat exchangers are all limited by their physical size as this depicts how much heat exchange surface is available to the dissimilar temperature fluids, passing either side of the heat exchange surface. For compactness, the plate heat exchanger is the obvious choice, but often NOT when one or both fluids carry particulate contamination, thus with the potential for blockage.
- The tube in tube heat exchanger, although significantly larger in size, also can present difficulties in cleaning, should fowling occur.
- Shell and tube heat exchanger, although smaller in size than its tube-in-tube counterpart, still has limitations.
- In ALL cases, the heat-transfer capability is limited by the available heat transfer surface.
Organic Heat Exchangers:
- The Organic Heat Exchanger eliminates ALL issues with heat transfer processes because the heat transfer surface increases proportionately with the volume of energy in storage.
- The Organic Heat Exchanger is so named because it uses the slight film of organic material surrounding each stored energy-rich particle as the only barrier to heat transfer.
- The more particles stored, the higher the heat transfer surface available.
- By example, an EnergiVault battery with a full charge capacity of 1MWh thermal, could support a cooling load of 6MW for 10 minutes duration.
- Similarly, the same EnergiVault could discharge at 100KW for a duration of 10 hours.
- This level of flexibility is unavailable from any other heat exchanger type.
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