Simulation of the performance of solar driven thermoelectric based rotary desiccant wheel HVAC system 2020-28-0041
In the automotive applications, the main functionality of the HVAC system includes, heating, ventilation, and cooling or air-conditioning of the vehicle interior to achieve the desired indoor thermal comfort. In the current scenario conventional vapor compression based HVAC system are widely used for this application. The typical refrigerants used to operate this equipment include HFCs and HFOs which are susceptible to cause environmental hazard. The aim of this article is to assess the performance of a hypothetical solar driven thermoelectric based rotary desiccant wheel HVAC system (D-HVAC) to be used for automotive applications. The D-HVAC system uses desiccant wheel to remove the latent heat, energy wheel to remove the sensible heat, evaporating coolers to achieve further cooling, the regeneration of the desiccant wheel by hot air and water as the refrigerant. In the case of solar driven–DHVAC system, the solar energy is utilized for regeneration of desiccant wheel in place of hot air. However, the intensity of incident solar energy varies throughout the day. To compensate for this energy fluctuation an an additional thermoelectric system (Peltier device) can be added to achieve the optimum regeneration of the desiccant wheel. The Peltier device avails the advantage to simultaneously heat the regeneration air and cool the process air to achieve the highest cooling coefficient of performance (COP) of the solar driven D-HVAC system. The usage of PV cells to produce the required electricity to operate the blowers (for process air and regeneration air) and motor of rotary desiccant wheel and TEC. In overall, through numerical simulation the increment in the COP of the solar driven thermoelectric based rotary desiccant wheel HVAC system in comparison with the simple D-HVAC system and conventional vapor compression based HVAC system are investigated.
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