Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle

Yeunyongkul, Pracha; Sakulchangsatjatai, Phrut; Terdtoon, Pradit

doi:10.3844/erjsp.2010.104.110

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Only few researchers have considered PHP in the place of a condenser to improve the COP of a refrigeration system. Pracha Yeunyongkul et.al [8] experimentally investigated the application of a closed loop PHP as a condenser for a vapour compression refrigeration system using R-22 as a refrigerant. The results showed that the efficiency rating of closed loop PHP was higher than conventional condenser by 13.4%.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Studies on the Application of Pulsating Heat Pipe in Vapour Compression Refrigeration System

Naik¹,

Pinto²,

Narasimha

et al. 2014

AMM

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This paper proposes a simplified theoretical model of Pulsating Heat Pipe (PHP) employed in a vapour compression refrigeration system. The model developed is mainly based on well known physical equations and partially based on empirical correlation. The present theoretical investigation of PHP is focused to explore its suitability as a heat exchanger in the condenser of vapour compression refrigeration system. A parametric analysis is carried out to design the vapour compression refrigeration system with PHP as the condenser. The performance of the system is evaluated for different PHP diameters, working fluids, evaporator and condenser temperatures and evaporator and condenser lengths. The effect of super heating and sub cooling the refrigerant are also studied. The results showed an increase in performance of the system at higher evaporator and lower condenser temperatures. The best results are obtained with R-12 as the working fluid. Also there is an increase in the COP of the system due to decrease in pressure drop in the condenser.

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Section: Introductionmentioning

confidence: 99%

Theoretical Studies on the Application of Pulsating Heat Pipe in Vapour Compression Refrigeration System

Naik¹,

Pinto²,

Narasimha

et al. 2014

AMM

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“…There is a lot of research studying the effect of the total cost on the optimum size and shape in terms of engineering. (Jinghua et al, 2009;Ozel and Pihtili, 2007;Bolatturk, 2006;Soylemez and Unsal, 1999;Soponpongpipat et al, 2010;Yeunyongkul et al, 2010) Conveyor design has been studied for a long time and there has been development on its design technique. For example, Tsalidi and Dentsoras (1997) illustrated the design of conveyor by applying design parameters space search technique.…”

Section: Introductionmentioning

confidence: 99%

Optimum Design and Cost Characteristic of Small Conveyor

Nanetoe

Soponpongpipat

2013

American Journal of Applied Sciences

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Although there are many works dealing with the economic analysis of a long conveyor, the information about a short conveyor is insufficient. This study, thus, deals with the short conveyor by studying the effect of belt width, belt length, convey capacity, and conveyor inclination angle on the cost characteristic of short conveyor. The study was done by calculating the conveyor belt widths and their supports that could service a given convey capacity, conveyor length, and inclination angle. The cost of conveyor corresponding to each belt width was, later, determined. After the total cost of each conveyor had been already calculated, the lowest total cost of conveyor for a given convey capacity, inclination angle, and conveyor length was found. The relationships between the belt widths, belt length, convey capacity, inclination angle and the lowest total cost was, finally, analyzed. In addition, the increase of the lowest total cost, when an overdesign of convey capacity was made, was also investigated. The study was done by case study of conveyor of convey capacity of 50-500 ton h -1 , the belt width of 400-1500 mm, the conveyor length of 10-100 m and conveyor inclination angle of 0-30°. The results showed that the lowest total cost was found, for all given values, at the belt width range of 400-500 mm. The lowest total cost increased with the increase of the belt length. For normal convey capacity of 50 ton h -1, an overdesigned value of 50 ton h -1 caused the lowest total cost to increase more than 7% compared with the lowest total cost in case of normal convey capacity. For normal convey capacity more than 100 ton h -1, an overdesigned value of 50 ton h -1 made the increase of the lowest total cost less than 2%.

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Experimental Investigations on the Thermal Performance of a Single Closed Loop Pulsating Heat Pipe Using TiO2 Nanofluid

Narasimha

2019

Journal of Heat Transfer

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This paper describes the experimental investigations conducted on a closed loop pulsating heat pipe (CLPHP) for assessing the thermal performance. The pulsating heat pipe has a single closed loop made of copper. The working fluids used are water and titanium dioxide nanofluids with varying concentrations of TiO2 nanoparticles (1.5% and 1%) on weight basis. The TiO2 particles are mixed in water to form a stable suspension using a sonicator. The heat input is varied between 40 W and 100 W in steps of 20 W. All experiments are conducted in the bottom heating mode (evaporator at the top) in the vertical and horizontal orientations. The parameters considered for evaluating the thermal performance are the temperature difference between evaporator and condenser, thermal resistance, heat transfer coefficient, and thermal conductivity. The results of the investigation reveal that the vertical orientation and increase in nanoparticle concentration favors better heat transfer performance of the single closed loop pulsating heat pipe.

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Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle

Cited by 4 publications

References 12 publications

Theoretical Studies on the Application of Pulsating Heat Pipe in Vapour Compression Refrigeration System

Theoretical Studies on the Application of Pulsating Heat Pipe in Vapour Compression Refrigeration System

Optimum Design and Cost Characteristic of Small Conveyor

Experimental Investigations on the Thermal Performance of a Single Closed Loop Pulsating Heat Pipe Using TiO2 Nanofluid

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