In the residential sector in Thailand, the largest source of energy consumption is air conditioning systems, particularly in summer as a reason of the high ambient temperatures. These high ambient temperatures affect condensers and result in low efficiency for the rejection of the heat out of the refrigerant. Moreover, air conditioning systems remove moisture from the air conditioning space due to the moisture in the air being condensed at the evaporator. This problem has led to a reduction in air conditioning systems using the condensed water to pre-cool the condenser. This study investigates the potential of reducing the energy of split-type air conditioners. We investigate the heat rejection from the condenser with a pre-cooling system compared to a traditional condenser. The result of the heat rejection from the condenser is extended to investigate the multiple linear regression model for future work. The pre-cooling system uses a wasted condenser coil to reduce the air temperature before entering the condenser. A commercial split-type air conditioner is used in this study since this type is the most used in Thailand. An ultrasonic humidifier is also installed to maintain the relative humidity at 70%RH in all testing conditions. The thermostat set points are 25, 26 and 27 ºC as the testing conditions. Each thermostat set point is tested using the pre-cooling system in the air conditioner and the traditional air conditioner. In total, six conditions are performed. The result shows that the pre-cooling system in the air conditioner can reduce the energy consumed by the air conditioner. The maximum energy reduction is 26.6% when used the pre-cooling system in the air conditioner is compared to the traditional air conditioner. The maximum heat rejection of the condenser using the pre-cooling system in the air conditioner is 74.3% higher than the traditional air conditioner. The multiple linear regression models and the coefficient of determination are reported. Finally, we conclude that the pre-cooling system in the air conditioner using removed condensed water to reduce the ambient air temperature before entering the condenser can reduce the energy consumed of split-type air conditioners and can be improved in future work.

在泰国的住宅领域，最大的能源消耗来源是空调系统，尤其是在夏季，因为环境温度较高。这些高环境温度会影响冷凝器并导致从制冷剂中排出热量的效率低下。此外，由于空气中的水分在蒸发器处冷凝，空调系统从空调空间中去除水分。这个问题导致使用冷凝水预冷冷凝器的空调系统减少。本研究调查了降低分体式空调能耗的潜力。与传统冷凝器相比，我们研究了带有预冷系统的冷凝器的散热情况。冷凝器的排热结果被扩展到研究多元线性回归模型以供未来工作。预冷系统使用浪费的冷凝器盘管来降低进入冷凝器之前的空气温度。本研究使用商用分体式空调，因为这种类型在泰国使用最多。还安装了超声波加湿器，以在所有测试条件下将相对湿度保持在 70%RH。恒温器设定点为 25、26 和 27 ºC 作为测试条件。每个恒温器设定点都使用空调和传统空调中的预冷系统进行测试。总共执行六个条件。结果表明，空调中的预冷系统可以降低空调的能耗。空调预冷系统与传统空调相比，最大节能26.6%。空调中采用预冷系统的冷凝器的最大排热量比传统空调高74.3%。报告了多元线性回归模型和决定系数。最后，我们得出结论，空调中的预冷系统在进入冷凝器之前使用去除的冷凝水降低环境空气温度可以降低分体式空调的能耗，并且可以在未来的工作中改进。空调中采用预冷系统的冷凝器的最大排热量比传统空调高74.3%。报告了多元线性回归模型和决定系数。最后，我们得出结论，空调中的预冷系统在进入冷凝器之前使用去除的冷凝水降低环境空气温度可以降低分体式空调的能耗，并且可以在未来的工作中改进。空调中采用预冷系统的冷凝器的最大排热量比传统空调高74.3%。报告了多元线性回归模型和决定系数。最后，我们得出结论，空调中的预冷系统在进入冷凝器之前使用去除的冷凝水降低环境空气温度可以降低分体式空调的能耗，并且可以在未来的工作中改进。