The Air-side Structure Optimization And Performance Simulation Of Parallel Flow Condenser In Window Type Air Conditioner

The parallel flow condenser is a new type of compact heat exchanger with high coefficient that is popular in the auto air-conditioning and is also one of the most promising heat exchangers. In recent years, it has been investigated extensively in household air-conditioning to replace the traditional fin tube heat exchanger for the energy-saving and cost reduction. So, the performance of parallel flow condenser was studied by the methods of numerical simulation, and its structure employed in the window type air conditioner was analyzed and optimized under various running condition.First, the air-side heat transfer and flow performance of parallel flow condenser was calculated,the effect of speed and fin parameters on the air-side heat transfer and pressure drop was analyzed, and the reasonable reference value of the air-side major structural parameters was raised. The study showed that reducing fin height and fin pitch, increasing louver pitch improves the air-side performance of heat exchanger. Then, a detailed parallel flow condenser for window type air conditioner was designed under running conditions.The steady-state distribution parameters model of parallel flow condenser was developed to simulate the distribution of refrigerant heat transfer coefficient, pressure and other relevant parameters, and then the impact of structural parameters on parallel flow condenser was analyzed. The study showed that refrigerant heat transfer coefficient, pressure drop along the passage vary significantly because of the refrigerant phase-change and the structural process change of condenser; the above number of factors should be taken into consideration in designing process layout and micro-channels of parallel flow condenser.The research result provides important guidance for improvement of the overall performance of parallel flow condenser and development of energy-saving window type air conditioner.