研究目的
To develop and optimize an integrated model of a desiccant cooling system coupled with a photovoltaic thermal-solar air heater (PVT-SAH) for performance evaluation and optimization in terms of Solar Fraction (SF) and Coefficient of Performance (COP).
研究成果
The study demonstrated that the desiccant cooling system assisted by a PVT-SAH can effectively control indoor air conditions within acceptable ranges. The optimal annual electrical COP was 19.8 with a Solar Fraction of 96.6% when the PVT-SAH area was 64 m2. The system's performance was enhanced with larger PVT-SAH systems, with a minimum area of 0.35 m2 per m2 of floor area required to outperform conventional vapor compression air conditioning systems.
研究不足
The study did not include a life cycle cost analysis to determine the economic feasibility of larger PVT-SAH systems. Additionally, the integrated model was not directly validated through experimental measurements due to the lack of a facility matching the study's design configuration.
1：Experimental Design and Method Selection:
The study involved developing an integrated model of a desiccant cooling system with a hybrid PVT-SAH and coupling it with a building model. The model was used to evaluate and optimize the system's performance. A double pass PVT-SAH system incorporating heat pipes was utilized to increase the air temperature for desiccant regeneration.
2：Sample Selection and Data Sources:
The study used a commercial building in Darwin, Australia, as a case study, with TMY2 weather profile data for simulations.
3：List of Experimental Equipment and Materials:
The PVT-SAH system included heat pipes, a desiccant wheel, auxiliary heater, heat recovery unit, and evaporative cooling components. The building model specifications and HVAC system details were also part of the experimental setup.
4：Experimental Procedures and Operational Workflow:
The integrated model was used to simulate the performance of the desiccant cooling system under various PVT-SAH sizes and configurations. The control strategy involved modulating the fraction of process air through the desiccant wheel and evaporative coolers to meet cooling demands.
5：Data Analysis Methods:
Performance indicators such as Solar Fraction (SF) and Coefficient of Performance (COP) were calculated to evaluate the system's efficiency. The Taguchi method was employed for design optimization of the PVT-SAH system.
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