scholarly journals Development of a water-mist cooling system: A 12,500 Kcal/h air-cooled chiller

2015 ◽  
Vol 1 ◽  
pp. 123-128 ◽  
Author(s):  
Chung-Neng Huang ◽  
Ying-Han Ye
Keyword(s):  
Cooling System ◽  
Water Mist ◽  
System A ◽  
Mist Cooling

scholarly journals Effect of Multipoint Sequential Water Mist Cooling of Casting Die on Microstructure and Mechanical Properties of AlSi11 Alloy

2012 ◽  
Vol 12 (4) ◽  
pp. 145-150
Author(s):  
R. Władysiak
Keyword(s):  
Mechanical Properties ◽  
Cooling System ◽  
Die Casting ◽  
Computer Control ◽  
Casting Process ◽  
Water Mist ◽  
Microstructure And Mechanical Properties ◽  
Casting Cycle ◽  
Mist Cooling ◽  
Die Casting Process

Abstract The work is a continuation of research on the use of water mist cooling in order to increase efficiency of the die-casting process for aluminum alloys. The paper describes the multipoint sequential cooling system of the casting die and its computer control and monitoring. It also includes results of the tests and analysis of cooling methods during making of the casting. These methods differ from each other in the sequence of casting die cooling and cause effective changes in microstructure and mechanical properties of castings made of AlSi11 alloy. The study demonstrated that the use of multipoint sequential cooling with water mist affects the microstructure refinement and reduces the segregation in the cast as well as more than by 20% increases the mechanical properties of castings in the rough state. The study also demonstrates that the sequential cooling of casting die accelerates the cooling of the casting and shortens die-casting cycle.

scholarly journals Structure of AlSi20 Alloy in Heat Treated Die Casting

2015 ◽  
Vol 15 (1) ◽  
pp. 113-118 ◽  
Author(s):  
R. Władysiak ◽  
A. Kozuń
Keyword(s):  
Cooling System ◽  
Die Casting ◽  
Computer Control ◽  
Water Mist ◽  
Research Station ◽  
Heat Treated ◽  
Wide Range ◽  
Mist Cooling ◽  
Casting Aluminum ◽  
Hypereutectic Silumins

Abstract The work is a continuation of research on the use of water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation on crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled a with water mist stream. The study was conducted for unmodified AlSi20 alloy and a modified one with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream and solution heat treatment allows in wide range for the formation of the microstructure of hypereutectic silumins. It leads to the growth of microstructure refinement and spheroidizing of phases in the casting.

scholarly journals Effect of Water Mist Cooling on Microstructure of Hypereutectic Al-Si Alloy

2014 ◽  
Vol 14 (3) ◽  
pp. 117-122 ◽  
Author(s):  
R. Władysiak ◽  
A. Kozuń
Keyword(s):  
Cooling System ◽  
Computer Control ◽  
Water Mist ◽  
Research Station ◽  
Solidification Temperature ◽  
Wide Range ◽  
Mist Cooling ◽  
Casting Aluminum ◽  
Hypereutectic Silumins ◽  
Made In

Abstract The work is a continuation of research on the use water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified AlSi20 alloy and modified with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream allows the formation of the microstructure of hypereutectic silumins. A wide range of solidification temperature of hypereutectic silumins increases the potential impact of changes in the cooling rate on a size, a number and a morphology of preeutectic silicon and eutectic α+β (Al+Si).

scholarly journals Analysis of Crystallization Process of Intensive Cooled AlSi20CuNiCoMg Alloy

2017 ◽  
Vol 17 (2) ◽  
pp. 137-144 ◽  
Author(s):  
R. Władysiak ◽  
A. Kozuń ◽  
K. Dębowska ◽  
T. Pacyniak
Keyword(s):  
Thermal Imaging ◽  
Crystallization Process ◽  
Cooling System ◽  
Computer Control ◽  
Solidification Process ◽  
Water Mist ◽  
Research Station ◽  
Wide Range ◽  
Imaging Camera ◽  
Mist Cooling

Abstract The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of multicomponent synthetic hypereutectic alloy AlSi20CuNiCoMg. The study was conducted for unmodified silumin on the research station allowing the cooling of the special permanent sampler using a program of computer control. Furthermore, the study used a thermal imaging camera to analyze the solidification process of multicomponent alloy. The study demonstrated that the use of mold cooled with water mist stream allows in wide range to form the microstructure of hypereutectic multicomponent silumin. It leads to higher homogeneity of microstructure and refinement of crystallizing phases of casting.

scholarly journals Effect of Casting Die Cooling on Solidification Process and Microstructure of Hypereutectic Al-Si Alloy

2016 ◽  
Vol 16 (4) ◽  
pp. 175-180
Author(s):  
R. Władysiak ◽  
A. Kozuń ◽  
T. Pacyniak
Keyword(s):  
Cooling System ◽  
Computer Control ◽  
Solidification Process ◽  
Water Mist ◽  
Research Station ◽  
Permanent Mold ◽  
Wide Range ◽  
Mist Cooling ◽  
Hypereutectic Silumins ◽  
Made In

Abstract The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic alloys: AlSi15 and AlSi19. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified silumins on the research station allowing the cooling of the special permanent probe using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of hypereutectic silumins. The study demonstrated that the use of mold cooled with water mist stream allows in wide range the formation of the microstructure of hypereutectic silumins. It leads to higher homogeneity of microstructure and refinement of crystallizing phases and also it increases subsequently the mechanical properties of casting.

Numerical Simulation on the Temperature Characteristics of Indirect Air Cooling System

2015 ◽  
Vol 741 ◽  
pp. 536-540
Author(s):  
Xiao Zhi Qiu ◽  
Yan Ming Zhao ◽  
Bao Hua Huang ◽  
Wei Xu
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Cooling System ◽  
System Change ◽  
Temperature Characteristic ◽  
Air Cooling ◽  
Ansys Software ◽  
System A ◽  
Air Cooling System ◽  
Simulation Results

Based on the analysis of indirect air cooling system, a numerical simulation model of indirect air cooling system was constructed by ANSYS software. According to the different wind speed condition, the temperature characteristic of indirect air cooling system was analyzed. The simulation results show that with the increase of wind speed, the ventilation and heat release of the indirect air cooling system change greatly. It provides a theoretical basis for the design of the wind-proof device of indirect air cooling system.

Rechargeable Personal Air Conditioning Device

2016 ◽  
Author(s):  
Yilin Du ◽  
Jan Muehlbauer ◽  
Jiazhen Ling ◽  
Vikrant Aute ◽  
Yunho Hwang ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Cooling System ◽  
Cooling Capacity ◽  
Comfort Level ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
System A ◽  
Single Person ◽  
Vapor Compression Cycle ◽  
Compression Cycle

A rechargeable personal air-conditioning (RPAC) device was developed to provide an improved thermal comfort level for individuals in inadequately cooled environments. This device is a battery powered air-conditioning system with the phase change material (PCM) for heat storage. The condenser heat is stored in the PCM during the cooling operation and is discharged while the battery is charged by using the vapor compression cycle as a thermosiphon loop. The conditioned air is discharged towards a single person through adjustable nozzle. The main focus of the current research was on the development of the cooling system. A 100 W cooling capacity prototype was designed, built, and tested. The cooling capacity of the vapor compression cycle measured was 165.6 W. The PCM was recharged in nearly 8 hours under thermosiphon mode. When this device is used in the controlled built environment, the thermostat setting can be increased so that building air conditioning energy can be saved by about 5–10%.

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