Performance of Ice Slurry Generator with Mechanical Scraper using R-22 and R-290

Ice slurry technology is highly favored to maintain the freshness of fish, as the cooling capacity of ice slurry is higher than that of flaked ice, tubular ice, plate ice, and block ice. One important part of an ice-slurry system is the ice generator. A mechanical scraper is the easiest type of ice-slurry generator to fabricate, because mechanical scrapers use only one type of material, such as stainless steel. The purpose of this research was to develop a prototype ice-slurry generator and analyze its performance. To enable comparison of their performance, both the R-22 and R-290 refrigerants were used as the working fluids in the refrigeration system. The study observed the time necessary to form ice and the scraper’s ability to scrape the ice on the inner surface of the evaporator. The best system included faster ice-slurry generation and a durable generator that did not freeze up. Four combinations of scraper RPM and pump RPM varied speeds from low to high. The results showed that using R-290 refrigerant and lower RPM speeds for both the scraper and the pump generated ice slurry in a shorter time.

Ice slurry; Mechanical scraper; R-22; R-290; Sea water

The present study investigated the performance of an ice-slurry generator having a mechanical scraper. The results showed that a higher scraper speed and a constant pump speed took longer to produce ice slurry than did a lower scraper speed but had the advantage of maintaining scraper performance without sudden cessations. In contrast, a higher pump speed and a constant scraper speed decreased the temperature of sea water more quickly. In addition, the results indicated that R-290 was a more efficient refrigerant than R-22, efficiently lowering the temperature of more sea water, enabling ice scraping, and avoiding generator freezing.

This study was funded by a grant from Fundamental RISTEKDIKTI, Number: 2566/UN2.R3.1/HKP05.00/2017

Constantinou, M., Mokha, A., Reinhorn, A., 1990. Teflon Bearings in Base Isolation II: Modeling. Journal of Structural Engineering, Volume 116(2), pp. 455–474

Egolf, P.W., Kauffeld, M., 2005. From Physical Properties of Ice Slurries to Industrial Ice Slurry Applications. International Journal of Refrigeration, Volume 28(1), pp. 4–12

Frei, B., Huber, H., 2005. Characteristics of Different Pump Types Operating with Ice Slurry. International Journal of Refrigeration, Volume 28(1), pp. 92–97

Hernández, M., Sebastián, D., Fernández, S., Pedro, J., Gómez, I., Fernando, Robles, V., Antonio, 2013. Production of Ice Slurry in a Scraped-Surface Plate Heat Exchanger. Available online at http://hdl.handle.net/10317/4572, Accessed on March 21, 2017

Kauffeld, M. Wang, M.J., Goldstein, V., Kasza, K.E., 2010. Ice Slurry Applications. International Journal of Refrigeration, Volume 33(8), pp. 1491–1505

Kauffeld, M., Kawaji, M., Egolf, P.W., 2005. Handbook on Ice Slurries. International Institute of Refrigeration, Paris, 359

Kitamurai, K., Matsumoto, Y., Uno, M., 2015. Introduction of Ice Slurry Producing Apparatus Capable of Making Ice from 1wt% Salinity. Journal of Fishing Boat and System Engineering Association of Japan, pp. 2–3

Kementrian Kelautan dan Perikanan (KKP), 2014. Performance Reports of Marine and Fisheries Ministry Indonesia. Jakarta

Lakhdar, M.B., Cerecero, R., Alvarez, G., Guilpart, J., Flick, D., Lallemand, A., 2005. Heat Transfer with Freezing and a Scraped Surface Heat Exchanger. Applied Thermal Engineering, Volume 25(1), pp. 45–60

Melinder, A., 2010. Properties and Other Aspects of Aqueous Solutions Used for Single Phase and Ice Slurry Applications. International Journal of Refrigeration, Volume 33(8), pp. 1506–1512

Wang, S.K., Wang, S.K., 2000. Handbook of Air Conditioning and Refrigeration. New York: McGraw-Hill