Energy recovery assessment in dairy production process
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Abstract
This research aimed to study utilizing the energy from regasifying the liquid nitrogen in a diary factory for reducing the energy consumption in a refrigeration system. In the study, the daily usage of liquid nitrogen, such as volume flow rate, pressure, and temperature, was applied for evaluating the heat of vaporization of liquid nitrogen. Moreover, cooling load of decreasing the temperature of milk to 8 oC before transporting to distributors was computed. It was found from analysis that at the liquid nitrogen 100 m3/h and pressure 7 bar, the heat of vaporization provided the refrigeration capacity of 13.35 kW. This study proposed three methods of energy saving in refrigeration system with various heat exchangers: (1) Decrease of temperature of chilled water before returning into the water chiller, resulting in reducing the chiller power of 7.39 kW or saving of 815.85 Baht/day. (2) Decrease of the temperature of chilled water before supplying to manufacturing process. Therefore, the chilled-water temperature leaving from the chiller can be set higher. This leads chiller power to reduce of 0.68 kW or saving of 75.07 Baht/day. (3) Decrease the temperature of milk to 8 oC with ice thermal storage. This provides the maximum energy saving. It can save the energy of 792.20 kWh/day or 2,851.92 Baht/day.
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Published manuscript are the rights of their original owners and RMUTSB Academic Journal. The manuscript content belongs to the authors' idea, it is not the opinion of the journal's committee and not the responsibility of Rajamangala University of Technology Suvarnabhumi
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