Title : Experimental study on the heat transfer enhancement of a latent heat thermal energy storage using air injection technique
The International Energy Association (IEA) reported in 2014 that the total annual primary energy supply was the equivalent of 13,699 billion tons of oil. The main challenge currently facing the world is how to reduce the dependence on energy generated by burning fossil fuels, given the many environmental consequences, such as emissions of greenhouse gases like CO2 which contribute to climate change. Thus, the emphasis has recently shifted towards considering environmentally friendly energy sources, such as solar, wind and geothermal power. Among these sources, solar energy has received increasing attention and has been exploited widely for direct electrical generation, using for instance photovoltaic (PV) or thermal systems, such as solar water heaters. However, the deployment of solar energy is impeded as it is only available during daylight hours. Methods have therefore been proposed to effectively store solar energy during the day and use it at night. Thermal energy storage is a key technology to enable sustainable implementation of solar energy .In this study, the thermal performance of latent heat thermal energy storage (LHTS) with air bubbles injection will carry out experimentally. Paraffin wax and tap water with different initial temperatures and flow rates will use as a phase change material (PCM) and heat transfer fluid (HTF) respectively. Both charging (PCM melting) and discharging (PCM solidification) processes will investigate and compare with another storage working at the same conditions but without air bubbles. Three different initial temperatures of the heat transfer fluid (HTF) (i.e. 65, 75 and 85 C) and three different flow rates will tested for charging process while only one initial HTF temperature ( 20 C) and the same three flow rates for the discharging process. The temperature and liquid fraction of the PCM will measure with time during the charging and discharging processes. In addition to the amount of the energy storage and the LHTS effectiveness at the different operational conditions will predict and compare with the reference storage (without air bubbles). Numerical simulation could be carried out to simulate the experimental results. In this case more parameters of the storage could be studied exploiting the flexibility of the numerical method will use.
Audience Takeway Notes:
- The audience will be able to use the technique of renewable energies.
- The audience can use renewable energies instead of pollutants energies.
- Can be used in their research and teaching.
- Design the techniques of renewable energies.