Thermal Analysis and Optimization of Direct Contact Ice Slurry Preparation Sys-tem

2021 ◽  
Vol 09 (03) ◽  
pp. 140-150
Author(s):  
甫 方
Keyword(s):  
Thermal Analysis ◽  
Direct Contact ◽  
Ice Slurry ◽  
Slurry Preparation

An Analysis of a Direct Contact Ice Slurry Generator

2008 ◽  
Author(s):  
M. A. Wahed ◽  
M. N. A. Hawlader
Keyword(s):  
Heat Transfer ◽  
Simulation Model ◽  
Direct Contact ◽  
Coolant Flow ◽  
Temperature Profiles ◽  
Ice Slurry ◽  
Generation System ◽  
Contact Heat ◽  
Flow Rates ◽  
Contact Heat Transfer

Attempts have been made to study an ice slurry generation system where two immiscible liquids, water and a coolant, are used to produce ice slurry by direct contact heat transfer. A mathematical model has been developed to evaluate the heat transfer phenomena between the coolant drops and the water in the ice slurry generation system. In this process, all the important variables that affect the direct contact heat transfer between these two fluids were incorporated into the simulation model to evaluate thermal performance of the system. Experiments were performed on an ice slurry generator using water and an immiscible liquid coolant, Fluroinert FC-84. The coolant at about −10°C to −15°C was delivered to the top of the ice slurry generator containing water and collected from the bottom for recirculation. The measured temperature profiles of water in the ice slurry generator for different coolant flow rates (8 lit/min to 12 lit/min) showed a good agreement with those temperature profiles obtained from the simulation model. These results validated the simulation model developed for the ice slurry generator. The analysis showed that during sensible cooling, the estimated heat transfer coefficients between water and the coolant were in the range of 3.0 to 6.5 kW/m2 for coolant flow rates varying from 8 lit/min to 12 lit/min. Higher coolant flow rates also enhanced the ice formation process due to the increased heat transfer rate. In addition, it was also observed that the ice production increased significantly when the nozzle was placed at the bottom of the ice slurry generator.

scholarly journals Thermal analysis evaluation of direct contact membrane distillation system

2019 ◽  
Vol 13 ◽  
pp. 100377 ◽  
Author(s):  
Mohamed R. Elmarghany ◽  
Ahmed H. El-Shazly ◽  
Mohamed S. Salem ◽  
Mohamed Nabil Sabry ◽  
Norhan Nady
Keyword(s):  
Thermal Analysis ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Direct Contact Membrane Distillation ◽  
Distillation System

Ice-slurry production using direct contact heat transfer

2004 ◽  
Vol 27 (5) ◽  
pp. 511-519 ◽  
Author(s):  
N.E. Wijeysundera ◽  
M.N.A. Hawlader ◽  
Chan Wee Boon Andy ◽  
M.Kamal Hossain
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Ice Slurry ◽  
Contact Heat ◽  
Contact Heat Transfer

scholarly journals Analysis of ice slurry production by direct contact heat transfer of air and water solution

2013 ◽  
Vol 14 (8) ◽  
pp. 583-588 ◽  
Author(s):  
Xue-jun Zhang ◽  
Ke-qing Zheng ◽  
Ling-shi Wang ◽  
Wei Wang ◽  
Min Jiang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Water Solution ◽  
Ice Slurry ◽  
Contact Heat ◽  
Contact Heat Transfer

Experimental thermal study of ice slurry production system equipped with direct contact heat exchanger and spiral nozzle

2020 ◽  
pp. 1-27
Author(s):  
Yaokang Zhang ◽  
Lin Su ◽  
Zhaoyang Xu ◽  
Kaijun Dong ◽  
Jing Li
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Production System ◽  
Direct Contact ◽  
Water Flow Rate ◽  
Production Performance ◽  
Ice Slurry ◽  
Internal Water ◽  
System Pressure ◽  
Ice Production

Abstract For direct contact ice slurry production system, the obstacles of ice blockage in the nozzle, enormous refrigerant charge and refrigerant-water separation restrict its commercial application. In this paper, a novel direct contact ice slurry production system is proposed to overcome these obstacles. In this novel system, the horizontal PVC pipe with spiral nozzle is designed as a direct contact ice slurry generator to avoid ice blockage in the nozzle. The two phase RC318 is utilized as the system refrigerant. In order to investigate the ice production performance of this novel system, the effects of compressor rotational speed, internal water flow rate and initial system pressure on ice production performance are experimentally studied, and a lump model is established. The results show that the ice production performance is mainly affected by the compressor rotational speed, but scarcely affected by the internal water flow rate. However, large ice blocks are formed at small internal water flow rate. Besides, the lump model is considered to be able to predict the water temperature. Furthermore, the sinking of liquid refrigerant exits under the higher initial system pressure, but it can be avoided by reducing the initial system pressure.

Analyses of ice slurry formation using direct contact heat transfer

2009 ◽  
Vol 86 (7-8) ◽  
pp. 1170-1178 ◽  
Author(s):  
M.N.A. Hawlader ◽  
M.A. Wahed
Keyword(s):  
Heat Transfer ◽  
Direct Contact ◽  
Ice Slurry ◽  
Contact Heat ◽  
Contact Heat Transfer

Ice Slurry Generation for Direct Contact Cooling

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Koji Fumoto ◽  
Toshiki Sato ◽  
Tsuyoshi Kawanami ◽  
Takao Inamura
Keyword(s):  
Aqueous Solution ◽  
High Pressure ◽  
Direct Contact ◽  
Freezing Point ◽  
Solution Concentration ◽  
Freezing Point Depression ◽  
Ice Slurry ◽  
Supercooling Degree ◽  
Basic Characteristics ◽  
Pressure Shift Freezing

Ice slurry has attracted a great deal of attention as a coolant for direct contact cooling. In this study, we generated ice slurry by the method of pressure shift freezing (PSF), which is based on the freezing-point depression of an aqueous solution at high-pressure conditions. As a result, the basic characteristics of the ice slurry generation are clarified. Moreover, the physical properties of the ice slurry indicate that the shape of an ice particle in the ice slurry is strongly affected by both the supercooling degree and the aqueous solution concentration.

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