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

Naik, Rudra; Pinto, L. T.; Narasimha, K. Rama; Pundarika, G

doi:10.4028/www.scientific.net/amm.592-594.1801

Cited by 5 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cooling capacity of the condensation section of PHP is also very important among many factors and has attracted the attention of many scholars in recent years. Naik et al [16] put forward a simplified theoretical model of PHP used in the vapor compression refrigeration system. It was found that the performance of the system was improved at a higher temperature of the evaporation section and a lower temperature of the condensation section.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cooling Water Flow Rate on Start and Heat Transfer Performance of Pulsating Heat Pipe at Different Inclination Angles

Shi

Liu

et al. 2023

Sustainability

View full text Add to dashboard Cite

Pulsating heat pipe (PHP) is an efficient heat transfer technology applied in the fields of heat dissipation and energy utilization. There are many factors affecting the heat transfer of PHP, including working fluid, filling ratio, inclination angle, etc. The cooling capacity of the cooling water system at the condensing section to the working fluid is also an important factor affecting the starting and operating of PHP. The research on PHP at different cooling water flow rates is of great significance for enhancing the operating performance. An experimental investigation of starting and running performance is carried out on a closed loop PHP with ultrapure water under different inclination angles of 90°, 60° and 30°. The starting and heat transfer performance of PHP with a filling ratio of 50% is obtained by adjusting the heat input in the range of 30–210 W at different cooling water flow rates of 6.7 g/s, 9.7 g/s and 13.9 g/s. The temperature and heat transfer resistance are used for analyzing the heat transfer performance. The results show that the starting mode, initial pulsating temperature and different heat transfer effects are brought about by different cooling water flow rates. It is observed that the cooling water flow rate has no obvious influence on the starting mode of PHP and that the starting mode of PHP is temperature progressive, starting with the increase in cooling water flow rates at a heating input of about 30 W. The influence of cooling water flow rates on the heat transfer performance of PHP is affected in a different way by inclination angles. The heat transfer performance of PHP with an inclination angle of 90° is similar at 6.7 g/s, 9.7 g/s and 13.9 g/s but, under the condition of 60° and 30°, the heat transfer resistance drops within a certain range effectively with an increasing cooling water flow rate from 6.7 g/s to 9.7 g/s and the heat transfer performance does not change significantly with the cooling water flow rate increasing to 13.9 g/s. Thus, there is an optimal value for the cooling water flow rate during the operating of PHP. The inclination angle also has an important effect on the temperature pulsating, and the temperature of PHP affected by gravity is stable with an inclination angle of 90°. However, the reduced influence of gravity on the backflow of the working fluid drops when the inclination angle decreases from 90° to 30°, and the wall temperature increases due to local overheating when the high heat input occurs.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Cooling Water Flow Rate on Start and Heat Transfer Performance of Pulsating Heat Pipe at Different Inclination Angles

Shi

Liu

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…A simplified theoretical model of PHP employed as the condenser in a vapor compression refrigeration system has been developed. The performance of the system was improved [18]. PHP had also been used as heat sink of a high power LED street light [19] and defrosting plate [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a solar collector integrated with a pulsating heat pipe and a compound parabolic concentrator

Zhang

Wang

et al. 2017

Energy Conversion and Management

105

View full text Add to dashboard Cite

The paper reports an experimental investigation of a newly proposed solar collector that integrates a closed-end pulsating heat pipe (PHP) and a compound parabolic concentrator (CPC).The PHP is used as an absorber due to its simple structure and high heat transfer capacity. The CPC has a concentration ratio of 3.4 and can be readily manufactured by three-dimensional printing. The CPC can significantly increase the incident solar irradiation intensity to the PHP absorber and also reduce the heat loss due to the decrease in the area of the hot surface. A prototype of the solar collector has been built, consisting of a PHP absorber bent by 4 mm diameter copper tube, CPC arrayed by 10×2 CPC units with the collection area of 300×427.6 mm 2 , a hot water tank and a glass cover. HFE7100 was utilized as the working fluid at a filling ratio of 40%. The operating characteristics and thermal efficiency of the solar collector were experimentally studied. The steady and periodic temperature fluctuations of the evaporation and condensation sections of the PHP absorber indicate that the absorber works well with a thermal resistance of about 0.26 ℃/W. It is also found that, as the main factor, the thermal performance of the collector decreases with increasing evaporation temperature. The collector apparently shows start-up, operational and shutdown stages at the starting and ending temperatures of 75 °C. When the direct normal irradiance is 800 W/m 2 , the instantaneous thermal efficiency of the solar collector can reach up to 50%.

show abstract

A Review on Application of Heat Pipe to Improve Vapor Compression Refrigeration System Performance

Sharma

Singh

Raj

et al. 2023

Lecture Notes in Mechanical Engineering

View full text Add to dashboard Cite

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

Cited by 5 publications

References 10 publications

Influence of Cooling Water Flow Rate on Start and Heat Transfer Performance of Pulsating Heat Pipe at Different Inclination Angles

Influence of Cooling Water Flow Rate on Start and Heat Transfer Performance of Pulsating Heat Pipe at Different Inclination Angles

Experimental investigation of a solar collector integrated with a pulsating heat pipe and a compound parabolic concentrator

A Review on Application of Heat Pipe to Improve Vapor Compression Refrigeration System Performance

Contact Info

Product

Resources

About