Thermal energy storage (TES) can play a critical role in the energy chain and hence in future clean energy systems. However, a competitive TES technology requires a number of scientific and technological challenges to be addressed including materials, components and devices, and integration of the devices within energy networks and associated dynamic optimization. TES can help to provide a balance between the energy demand and supply and utilise waste heat generated in various applications in industry including energy production, conversion processes and in the process industry produced from energy generation or industrial processes. Besides, thermal energy storage can also benefit the commercial and industrial refrigeration market.

The CORNET ShortStore project aims at investigating the potential for the integration of thermal energy storage in industry, by reviewing available thermal storage technologies, considering their potential for deployment at large scale, and investigating their potential of load-shifting capability to help balance supply and demand of heat and electricity.

As part of the project a pilot-scale demonstration system will be commissioned. A high temperature latent heat storage system will be built and coupled with an Organic Rankine Cycle. Optimizing the control and operation of this PCM thermal storage should lead towards system integration solutions in both manufacturing industry and the refrigeration sector. 

Techno-economical feasibility studies of cases proposed by members of the project will be caried out.

Period: 01/2017 - 01/2019

With the financial support of:

Thermal Energy Storage

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.

Latent heat Storage

In latent heat storage systems, the phase transition of the storage material is used for storing thermal energy. Materials whose phase change, commonly from solid to liquid, is used for storing thermal energy are known as phase-change materials (PCMs).

Latent heat storage systems are characterized by high volume-specific storage densities at a narrow temperature interval. The majority of the thermal energy is stored at a constant temperature, but when a PCM is heated initially it behaves like sensible heat energy storage and the materials temperature is increased. However, once the transition temperature is reached the material will continue to absorb heat at a constant temperature while it changes state. This heat absorbed at constant temperature is known as the latent heat of the transition. To recover the energy stored in the PCM it can be changed back from the liquid to the solid phase and the energy stored as latent heat is released. The constant storage temperature allows for a good adaptability for optimal heat transfer to the consumer.

Sensible heat storage

Sensible heat storage is the most common method and has been employed for hundreds of years as hot water tanks. Sensible heat storage simply means changing the temperature of storage medium. The storage medium is most commonly water but rock, sand, clay and earth can also all be used.