The Test Performance of Two Stage Refrigeration System and Comparison with Single Stage System in Freezing Unit of 5 kg Mango Puree
- DOI
- 10.2991/978-94-6463-772-4_53How to use a DOI?
- Keywords
- Mango puree; refrigeration system; two stage system; single stage system
- Abstract
Currently, many local micro-industries have begun to process mango fruit into various kinds of food and drinks. Such as being processed into dodol, syrup, jelly, and even coffee from mango seeds. Before being processed into products as above, mangoes are first made in puree form, where puree is fruit pulp which is a semi-finished ingredient and can be further processed into juice, jam, dodol, candy and ice cream. This puree is rich in nutrients, contains various vitamins and minerals, because it is rich in nutrients, this product is very popular with microorganisms as a place to live. Therefore the puree must be preserved to extend its shelf life. One of the efforts made to extend the shelf life of this puree is by freezing it using a freezer unit. Every industry that operates in the field of freezing mango puree has at least a blast freezer and freezer room. A blast freezer is a room used to freeze quickly (generally around 4 - 6 h) so that the growth of microorganisms can be prevented. The standard temperature for the blast freezer room is -30 to -40 oC. With this low temperature, a blast freezer that uses a single stage system will result in a high compressor discharge temperature (more than 90 oC) and will also result in a short compressor lifetime. With a double stage refrigeration system, these problems can be avoided considering that in the two stage refrigeration system there is an additional cooling system with intercooler in order to prevent the occurrence of high compression ratios. A blast freezer unit with a two stage refrigeration system has been created where the unit is also parallel to the single stage system. The blast freezer unit is used to freeze 5 kg of mango puree within 2 h for one testing process. Testing was carried out 2 times, the first using a two stage system and the second using a single stage system. It was found from the test results that the lowest evaporator temperature that could be achieved on two stages was -18.1 oC, while on a single stage it was only -13.4 oC. The actual COP value and refrigeration efficiency in the two stage system is 2.24 for COP and 69% efficiency, while in the single stage system the actual COP is 2.31 and the efficiency is 48%, lower than the test on the two stage system.
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- © 2025 The Author(s)
- Open Access
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Cite this article
TY - CONF AU - Ahmad Maulana Kartika AU - Sunanto Sunanto AU - Ade Suryatman Margana AU - Triaji Pangripto PY - 2025 DA - 2025/07/01 TI - The Test Performance of Two Stage Refrigeration System and Comparison with Single Stage System in Freezing Unit of 5 kg Mango Puree BT - Proceedings of the 10th International Conference on Science and Technology (ICST 2024) PB - Atlantis Press SP - 592 EP - 599 SN - 2352-5401 UR - https://doi.org/10.2991/978-94-6463-772-4_53 DO - 10.2991/978-94-6463-772-4_53 ID - Kartika2025 ER -