Effective use of available energy from air conditioning condensate in a typical cold storage plant is studied. The condensate quantity was estimated for a 17,580 kW cooling capacity at around 150 to 170 liters per day at an average temperature range of 9 °C to 11 °C. Two eco-friendly phase change materials, namely coconut oil and lauryl alcohol were used to recover energy from the cold condensate. Thermophysical properties of selected phase change materials were studied for both pure samples as well as for samples after 250 cycles. Fourier-Transform Infrared Spectroscopy results confirmed that no chemical reaction took place during and after the thermal cycling and that the PCMs were chemically stable even at 250 cycles. Latent heat of fusion of coconut oil and lauryl alcohol decrease by 10.55% and 52.9% respectively after 250 cycles. The variation in specific heat capacity and thermal conductivity at working range temperatures were observed before and after the thermal cycles and the results are discussed. The charging and discharging studies of PCMs (1 kg each) were carried out at 11±1 °C using a constant temperature water bath with a holding volume of 12 liters. The solidification was found to start at 22.3 °C for coconut oil and 23.1 °C for lauryl alcohol. During the solidification, it was found that coconut oil was supercooled from its actual freezing temperature by 2.6 °C. Due to this supercooling effect, the actual freezing time is prolonged by 25 min for coconut oil. However, no supercooling was observed in lauryl alcohol. Discharging of PCMs was carried out in an ambient environment of 32±1 °C. Melting study revealed that coconut oil and lauryl alcohol were melting at 23.2 °C and 23.8 °C respectively, which is almost equal to the human comfort temperature of 24 °C. However, considering the ecofriendly nature, thermal stability and material compatibility, coconut oil could be a better option compared to lauryl alcohol and other organic PCMs.

研究了在典型的冷库中有效利用空调冷凝水的可用能量。在平均温度范围为9°C至11°C时，估计冷凝量为17,580 kW，每天约150至170升。两种生态友好的相变材料，即椰子油和月桂醇，被用于从冷冷凝物中回收能量。对于纯样品以及250个循环后的样品，都研究了所选相变材料的热物理性质。傅里叶变换红外光谱法的结果证实，在热循环期间和之后均未发生化学反应，并且即使在250次循环后，PCM仍具有化学稳定性。250次循环后，椰子油和月桂醇的熔融潜热分别降低了10.55％和52.9％。在热循环之前和之后观察在工作范围温度下比热容和导热率的变化，并对结果进行讨论。使用容量为12升的恒温水浴在11±1°C下对PCM（每个1 kg）进行充电和放电研究。发现椰子油的固化开始于22.3°C，月桂醇的固化开始于23.1°C。在固化过程中，发现椰子油从其实际冷冻温度过冷了2.6°C。由于这种过冷效果，椰子油的实际冷冻时间延长了25分钟。但是，在月桂醇中没有观察到过冷。PCM的放电是在32±1°C的环境中进行的。融化研究表明，椰子油和月桂醇分别在23.2°C和23.8°C熔化，这几乎等于人类舒适的24°C温度。但是，考虑到环保性，热稳定性和材料相容性，与月桂醇和其他有机PCM相比，椰子油可能是更好的选择。