pamitran@eng.ui.ac.id
1999 – Mechanical Engineering, Universitas Indonesia
2004 – Refrigeration Engineering, Chonnam National University, South Korea
2009 – Refrigeration Engineering, Chonnam National University, South Korea
Ice Slurry Generator using seawater has received feedback from fishing community, therefore, its implementation will be continued.
It is feasible to use a natural refrigerant. Moreover, it has to be encouraged since it is environmentally friendly. In this study, we observed the characterization of a natural refrigerant in two-phase flow boiling conditions on a microchannel. In order to design a heat exchanger, we developed the correlations of the heat transfer coefficient, pressure drop, and flow pattern map. The ice slurry generator was built using several working fluids, including sea water, intended to facilitate fishermen to make ice to maintain the quality of their fish catch.
The background of Two-Phase Flow Boiling research with a microchannel was that there were still many areas that could be taken advantage of that would increase energy efficiency by improving the performance of heat transfer and fluid flow. Besides, the process used a natural refrigerant that was more environmentally friendly. We observed the two-phase boiling refrigerant flow on the microchannel to determine the heat transfer coefficient, pressure drop, and flow pattern. The microchannel use could be beneficial since it increased the heat transfer coefficient. However, it also created a negative impact, such as an increased pressure drop. The test pipes that were used were stainless steel pipes with diameters ranging from 7 mm to 0.5 mm. We visualized the refrigerant flow to determine the two-phase boiling refrigerant flow pattern, and a new correlation to predict the heat transfer coefficient and pressure drop was developed according to the results of this study to design a microchannel heat exchanger.
Traditional fishermen use blocks of ice from land to store their fish. Fishing duration depends very much on the existing stock of the ice blocks. Inspired by that constraint and trying to help those traditional fishermen, the Department of Mechanical Engineering invented an ice slurry maker made of seawater. That innovation aimed to reduce the fishermen’s dependence on their ice blocks and create the ease of ice-making in the middle of the sea so that the fishing duration would become longer. Since beaches currently contain many pollutants, the fishermen should go further away from the coastline. The ice slurry allows them to obtain a smoother and even cooling medium to cover their fish.
It will keep their fish and make their fish no risks of being damaged like what they experienced when using ice blocks. The temperature of the ice slurry to be formed can be adjusted based on the salinity of the sea. The higher the salinity of the fluids is, the lower the formed ice slurry temperature will be. Therefore, the cooling media could be regulated in water with low salinity to keep the fish fresh, dedicated to consumers who do not like frozen fish.
In addition to cooling fish and other products, ice slurry is also used in a cooling system as a secondary refrigerant. In a cooling building using cold storage, ice slurry can be used to reduce the initial investment cost of the cooling system. This research used water-glycol and Sodium Chloride as its cooling agents.