کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
790093 | 1466405 | 2015 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Performance characterisation of a small milk cooling system with ice storage for PV applications Performance characterisation of a small milk cooling system with ice storage for PV applications](/preview/png/790093.png)
• Conventional DC refrigerators are used for on-farm milk cooling.
• The system uses ice storage to improve milk cooling speed and energy performance.
• The developed model calculates temperature transients and energy consumption.
• The amount of milk to cool down and ambient temperature are inputs of the model.
• The results can be used to size PV panels and batteries at different locations.
The presented work proposes a calculation method to estimate the transient performance of a small on-farm milk cooling system for PV applications. The system employs 3 kg ice for fast cooling of 17 L milk in conventional 20-L-milk-cans. Two units of a commercial DC refrigerator operate at −10 °C and at 4 °C for ice production and milk preservation respectively. The development of milk temperature and energy consumption during a cooling event was studied experimentally at different ambient temperatures of 20 °C, 30 °C and 40 °C. A computational model was developed and validated where thermal resistances and COP were adjusted with experimental data. The results between 20 °C and 40 °C ambient temperature show a COP reduction of around 30% and a total daily energy consumption increase of around 100%. The specific total energy consumption of the system per litre milk was between 30 Wh/L and 58 Wh/L for the studied ambient temperature range. The suggested model can be used for the optimisation of photovoltaic stand-alone systems at specific locations.
Journal: International Journal of Refrigeration - Volume 60, December 2015, Pages 81–91