Articles written in Sadhana

    • A standalone PV operated DC milk chiller for Indian climate zones


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      This work illustrates the design of a standalone solar power system used to power a milk chiller with 200 W DC compressors using the PVsyst software for different climatic zones in India. The design includes determination of minimum number of PV panels and batteries and also the means of obtaining annual solarfraction values for five different climatic zones of India using the software. Simulations were performed considering two different operational modalities. The first modality considered a milk chiller with an inbuilt ice bank tank for cool thermal energy storage. The ice formed during sunshine hours take care of the cooling of the milk throughout. The second modality considered a milk chiller coupled with a battery backup to get charged during sunshine hours and to run the compressor throughout. The first modality was found to be advantageous interms of PV panel requirement, battery backup as well as better solar fraction. Hence the same was experimentally studied for Chennai’s climate condition to confirm the maintenance of milk temperature. The power supply from the PV panel was simulated using a regulated power supply. While doing so, considering the maximum power point, the power supply was varied every hour as predicted by the PVsyst software. From the experiment, it was found that the required number of PV panels got reduced from 4 to 2 panels when consideringthe maximum power point for a typical summer day. The custom built milk chiller was able to chill down the milk from 37°C to 4°C within 2 hours on all days using cold energy from the ice bank tank.

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