Department of Energy and Environment, National Institute of Technology, Tiruchirappalli, India.
Department of Energy and Environment, National Institute of Technology, Tiruchirappalli, India.
Chemosphere. 2021 Oct;281:130705. doi: 10.1016/j.chemosphere.2021.130705. Epub 2021 May 8.
Assessment in a live cold storage plant revealed that the refrigeration process generated about 150-170 L of condensate per day at 10 °C-12 °C. In this study, phase change property of coconut oil was applied to recover and use the energy from condensate for pre-cooling apples. Charging studies of coconut oil was carried out experimentally and the charging time was found to be 234, 126, 95 and 93 min for condensate flow rates of 2.6 L/h, 4.25 L/h, 6.26 L/h and 8.33 L/h respectively. Discharging studies were conducted for natural and forced convection for pre-cooling of apples under two cases namely apples in direct contact (case i) and indirect contact (case ii) with the container. Under natural convection and direct contact, pre-cooling of 4 °C was achieved with a discharge duration of 260 min. In case (ii), pre-cooling of 3.5 °C was achieved with discharge duration of 304 min. Likewise, under forced convection, pre-cooling of 3.5 °C was achieved in 189 min for case (i) and 214 min for case (ii). Temperature difference between the top point and bottom point of the apple was 1.5 °C and 0.5 °C for case (i) and case (ii) respectively. Results confirmed that coconut oil as a PCM can be used for recovering energy from condensate for pre-cooling of apples before loading into a cold storage unit.
在一个现场低温冷藏库中的评估显示，在 10°C-12°C 的条件下，制冷过程每天会产生约 150-170 升冷凝水。在本研究中，椰子油的相变换特性被应用于回收和利用冷凝水中的能量，以对苹果进行预冷。椰子油的充注研究通过实验进行，发现当冷凝水流量分别为 2.6 L/h、4.25 L/h、6.26 L/h 和 8.33 L/h 时，充注时间分别为 234、126、95 和 93 分钟。为了对苹果进行预冷，进行了自然对流和强制对流的排放研究，分为两种情况，即苹果与容器直接接触（情况 i）和间接接触（情况 ii）。在自然对流和直接接触下，4°C 的预冷可在 260 分钟的排放时间内实现。在情况 ii 下，通过 304 分钟的排放时间可实现 3.5°C 的预冷。同样，在强制对流下，情况 i 下 3.5°C 的预冷可在 189 分钟内实现，情况 ii 下可在 214 分钟内实现。苹果顶部和底部之间的温差分别为 1.5°C 和 0.5°C，情况 i 和情况 ii 都是如此。结果证实，椰子油作为 PCM 可用于回收冷凝水中的能量，以便在将苹果装入冷藏库单元之前对其进行预冷。
