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DEFROSTING METHODS OF AIR CONDITIONER SYSTEMS OF SPLIT AIR CONDITIONER
(2021-02-12) Babay, Khaled A. A.
As the population has increased, the area of cooling and air conditioning has become extremely important. Freezing on the heat exchanger surface is an inevitable process that reduces the performance of heat pumps and cooling systems. Air Source Heat Pump (ASHP) units are used in applications worldwide due to the advantages of high efficiency, environmental protection, low cost and easy modification. This study reveals a defrost method of air conditioning systems of split air conditioners. In split air conditioning systems, four-way valves are used to assist the transition of heating and cooling. Many problems such as difficulty in the installation of the four-way valve, slow defrost, lack of maintenance and repair, weakness against high temperatures, and many other problems affect the operation of split air conditioners negatively. Alternative solutions are sought to eliminate these problems. The experiment results in the study show that there is a significant improvement in system performance during the defrost cycle by increasing the evaporation temperature and successively increasing the condensation temperature. Freeze melting is the result of heat transfer from the air conditioner during condensation. The increase in the condensing temperature is directly related to the defrost duration.