EXPERIMENTAL INVESTIGATION OF PERFORMANCE IMPROVEMENT OF HOUSEHOLD REFRIGERATOR USING PHASE CHANGE MATERIAL

2013 ◽  
Vol 21 (04) ◽  
pp. 1350029 ◽  
Author(s):  
MD. IMRAN HOSSEN KHAN ◽  
HASAN M. M. AFROZ
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Melting Point ◽  
Phase Change ◽  
Phase Change Material ◽  
Performance Improvement ◽  
Thermal Load ◽  
Storage System ◽  
Refrigeration Cycle ◽  
Change Material

An experimental investigation has been carried out to know about the performance improvement of a household refrigerator using phase change material (PCM). PCMs are used as latent heat thermal storage system to enhance the heat transfer of the evaporator. PCM is located behind the five sides of the evaporator cabinet in which the evaporator coil is immersed. Water (melting point 0°C) and Eutectic solutions (melting point −5°C) are used as PCMs for this experiment at different thermal loads. Depending on the types of PCM and thermal load, around 20–27% COP improvement of the refrigeration cycle has been observed with PCM with respect to without PCM. With the increase of the quantity of PCM (0.003 to 0.00425 m3) COP increases about 6%. Between two different PCMs the COP improvement for Eutectic solution is higher than Water. The experimental results with PCM confirm that, depending on the thermal load and the types of PCM average compressor running time per cycle is reduced significantly and it is found about 2–36% as compared to without PCM.

Physical Property and Thermal Physical Property of Microencapsulated Phase Change Material Slurry

2011 ◽  
Vol 110-116 ◽  
pp. 571-576 ◽  
Author(s):  
Yan Lai Zhang
Keyword(s):  
Heat Transfer ◽  
Melting Point ◽  
Phase Change ◽  
Phase Change Material ◽  
Physical Property ◽  
Melamine Resin ◽  
The Core ◽  
Microencapsulated Phase Change Material ◽  
Thermal Physical Property ◽  
Change Material

Microencapsulated phase change material (PCM) slurry is a kind of novel heat transfer fluid called latent functionally thermal fluid. Unlike conventional (sensible) materials, when the PCM reach the temperature at which they begin phase change (its melting point), they absorb large amounts of heat with little or no temperature change. Due to this, the heat transfer ability and energy transport ability can be obviously improved. Therefore, they have many potentially important applications in some fields such as energy storage, thermal conditioning of buildings, waste heat recovery, off peak power utilization, heat pump systems, space applications. In present study, the core materials are encapsulated with membrane of synthetic material. And the core materials are composed of several kinds of n-paraffin waxes (mainly nonadecane) and the membrane is a type of melamine resin. The range of diameter of the PCM particles is distributed from 0 μm to 4.5 μm, and its average diameter is 0.74 μm. The thickness of melamine resin is about 11nm. The melting point of the PCM is about 304K. Physical properties, such as density, diameter and its distribution of microencapsulated PCM slurry are investigated. Meanwhile, the thermal physical property, apparent specific heat, is determined by a Differential Scanning Calorimeter (DSC). Also, the influence of mass concentration has been discussed.

Design of Phase Change Material Based Domestic Solar Cooking System for Both Indoor and Outdoor Cooking Applications

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
S. M. Santhi Rekha ◽  
Sukruedee Sukchai
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Heat Loss ◽  
Phase Change Material ◽  
Storage System ◽  
Efficiency Factor ◽  
Concentric Cylinder ◽  
Optical Efficiency ◽  
Change Material ◽  
Indoor And Outdoor

This paper mainly focuses on the design of solar concentric parabolic cooker with proper arrangement of phase change material (PCM) heat storage system. The receiver is a hollow concentric cylinder with inner and outer radii being 0.09 m and 0.1 m, respectively. The thickness or the gap between the two layers of the receiver is 0.01 m and is filled with heat transfer oil. The outer layer of the receiver is surrounded by the vertical cylindrical PCM tubes of diameter 0.025 m. The three modes of heat transfer, radiation, convection, and conduction, are explained and analyzed by heat transfer network. The schematic view of the receiver is shown with the help of sketchup software. The performance parameters, heat loss factor, optical efficiency factor, cooking power of the solar cooker, were calculated with and without PCM in the receiver. 7.74 W m−2 and 2.46 W m−2 are the heat loss factors, and 0.098 and 0.22 are the optical efficiency factors of the solar cooker without and with PCM presented in the receiver. The optical efficiency factor of the solar cooker with PCM receiver is two times more than that receiver without PCM. The cooking power of the solar cooker with PCM receiver is 125.3 W which is 65.6 W more than that of the cooking power without PCM receiver. From these results, it can be concluded that the design of PCM solar cooking system can expand the applicability of solar cookers as a compatible cooking solution for cooking applications instead of using fossil fuel based cooking systems.

Design of a Modular Latent Heat Storage System for Solar Thermal Power Plants

2011 ◽  
Author(s):  
Mark R. Campbell ◽  
Marc Newmarker ◽  
Nathaniel Lewis ◽  
Christopher T. George ◽  
Gilbert Cohen
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Heat Transfer Surface ◽  
Change Material

Thermal energy storage systems designed to use phase change material can benefit from accounting for the reduction in heat transfer that results from fouling on the heat transfer surface or employing a system to minimize the amount of build-up on the heat transfer surface. This paper describes the modeling and design of a modular latent heat thermal energy storage system that can use an internal heat exchanger and a mechanical system to increase heat transfer to and from the phase change material. Theoretical heat transfer modeling of a 100 kWht storage system was performed, candidate phase change materials were tested, and mechanical material removal experiments were conducted. The results of this work led to a design that is in construction and will be operated in the future. The system is predicted to be capable of reaching 93% round trip efficiency while providing 2 hours of discharge at a nearly constant temperature.

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