Calculation formula for karst heat storage phase change energy storage

What is phase change material (PCM) and thermal energy storage (TES)?

Phase Change Material (PCM); Thermal Energy Storage (TES). Thermal energy storage (TES) is defined as the temporary holding of thermal energy in the form of hot or cold substances for later utilization . Energy demands vary on daily, weekly and seasonal bases.

How is latent heat calculated?

As heat is pumped into a material without a change in temperature, latent heat accumulates in the material before a phase change. The equation for calculating latent heat is q = m C p dT (s) + m L + m C p dT, where L is the enthalpy of fusion and dT is the temperature difference.

What are the principles of thermal energy storage?

Thermal energy storage operates based on two principles: sensible heat results in a change in temperature*. An identifying characteristic of sensible heat is the flow of heat from hot to cold by means of conduction, convection, or radiation.*

How can we calculate changes in internal energy for arbitrary materials?

• We’ve so far only been able to calculate changes in internal energy for ideal gases using the first law combined with the ideal gas law. The heat capacity gives us a means to determine changes in internal energy for arbitrary materials if we know the dependence of the heat capacity on temperature. For a constant volume process:

What is thermal energy storage (TES)?

Thermal energy storage (TES) systems provide several alternatives for efficient energy use and conservation. Phase change materials (PCMs) for TES are materials supplying thermal regulation at particular phase change temperatures by absorbing and emitting the heat of the medium.

What are the advantages of using phase-change materials (PCMs) in thermal storage?

The use of phase-change materials (PCMs) in thermal storage is a promising technology due to the advantage of latent heat. It provides a way of storing heat from renewable sources such as the sun and waste heat from industrial processes (4).