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article

A new multi‐objective optimization of refrigeration cycles (Case study: “Optimization of transcritical carbon dioxide cycle”)

Seyed Morteza Javadpour, Mohammad Mahdi Naserian, Abbas Zarenezhad Ashkezari

Environmental Progress & Sustainable Energy > 43 > 1 > n/a - n/a

For store and maintain products, ingredients, and other perishables at a safe temperature, there is a growing need for low‐temperature refrigeration systems. In this study, a new multi‐objective exergetic criterion is proposed for the optimization of refrigeration cycles, the conventional coefficient of performance (COP) maximization method results in high evaporator temperature, which is in contrast...

article

Experimental investigation and parameter analysis of LPG refrigeration system using Taguchi method

S. Boopathi

SN Applied Sciences > 2019 > 1 > 8 > 1-7

In this research work, an attempt has been made to study the liquefied petroleum gas (LPG) as an alternative refrigerant to eliminate the global warming potential causes many dangerous impacts on the environment by conventional refrigerants. An LPG refrigeration experimental setup has been fabricated using different lengths of capillary tubes, pressure regulator, evaporator, LPG supply unit, and gas...

article

A simplified guide for charged aerosol detection of non-chromophoric compounds—Analytical method development and validation for the HPLC assay of aerosol particle size distribution for amikacin

Arianne Soliven, Imad A. Haidar Ahmad, James Tam, Nani Kadrichu, more

Journal of Pharmaceutical and Biomedical Analysis > 2017 > 143 > C > 68-76

Amikacin, an aminoglycoside antibiotic lacking a UV chromophore, was developed into a drug product for delivery by inhalation. A robust method for amikacin assay analysis and aerosol particle size distribution (aPSD) determination, with comparable performance to the conventional UV detector was developed using a charged aerosol detector (CAD). The CAD approach involved more parameters for optimization...

article

Effects of the generator and evaporator temperature differences on a double absorption heat transformer—Different control strategies on utilizing heat sources

Hanzhi Wang, Huashan Li, Xianbiao Bu, Lingbao Wang

Energy Conversion and Management > 2017 > 138 > C > 12-21

The combination of the absorption heat transformer with renewable energy systems, like solar thermal systems, is raising more and more concern. In those combined systems the strategies on utilizing heat sources can affect system thermodynamic performance significantly. Therefore, this study presents a detailed analysis on the effect of the heat source temperature and different heat source flow patterns...

article

Experimental investigation of loop heat pipe with flat evaporator using biporous wick

B.B. Chen, W. Liu, Z.C. Liu, H. Li, more

Applied Thermal Engineering > 2012 > 42 > Complete > 34-40

In order to solve heat dissipation of electronic equipment, an experimental investigation was carried out on the thermal performance of a miniature stainless-steel-ammonia loop heat pipe (LHP) with a flat disk-shaped evaporator. A biporous wick made from nickel powder was used for developing the capillary force. Tests demonstrated that the device could start up at heat load as low as 2.5 W. Meantime,...

article

Effect of evaporation section and condensation section length on thermal performance of flat plate heat pipe

Shuangfeng Wang, Jinjian Chen, Yanxin Hu, Wei Zhang

Applied Thermal Engineering > 2011 > 31 > 14-15 > 2367-2373

Flat plate heat pipes (FPHPs) are one of the available technologies to deal with the high density electronic cooling problem due to their high thermal conductivity, reliability, and low weight penalty. A series of experiments were performed to investigate the effect of evaporation and condensation length on thermal performance of flat plate heat pipes. In the experiments, the FPHP had heat transfer...

chapter

Decoupled feedforward control for an air-conditioning and refrigeration system

Neera Jain, Richard J Otten, Andrew G Alleyne

Proceedings of the 2010 American Contrl Conference > 5904 - 5909

2010 American Control Conference (ACC 2010)

Multiple control objectives must be met in order to satisfy the system capacity and efficiency requirements of air-conditioning and refrigeration (A/C & R) systems. Moreover, in the HVAC industry, it is generally preferred to tune multiple single-input-single-output (SISO) control loops rather than a single multiple-input-multiple-output (MIMO) control loop. This paper demonstrates that a SISO...

chapter

Mathematical model of heat and mass transfer in a wick structure of a loop heat pipe

Fang-Chou Lin, Chien-Chih Yeh, Shen-Chun Wu, Yau-Ming Chen

2009 4th International Microsystems, Packaging, Assembly and Circuits Technology Conference > 356 - 359

2009 4th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)

A mathematical steady-state model of a loop heat pipe (LHP) system was developed in this study. The model was based on the energy conservation and the phase-change heat transfer in porous media. The evaporator temperature was predicted including using a monoporous wick structure and using a biporous wick structure, which has two characteristic pore sizes. Experiments were also executed in this study...

chapter

Experimental investigation on HFC134a ejector refrigeration system

Zheng Hui-fan, Fan Xiao-wei, Li An-gui

2009 4th IEEE Conference on Industrial Electronics and Applications > 2168 - 2171

2009 4th IEEE Conference on Industrial Electronics and Applications

An experimental ejector refrigerant system is designed and constructed to study the performance of HFC134a as working fluid in this paper. The influence of evaporator, generator, and condenser temperatures on the system performance is studied. The experimental results demonstrate that the entrainment ratio, cooling capacity, and COP of the system increase with increasing of the evaporator temperature,...

chapter

Thermal Performance Correlation of Horizontal Closed-Loop Oscillating Heat Pipes

P. Charoensawan, P. Terdtoon

2007 9th Electronics Packaging Technology Conference > 906 - 909

2007 9th Electronics Packaging Technolgy Conference

The thermal performance of a closed-loop oscillating heat pipe which operates at horizontal orientation (Horizontal closed-loop oscillating heat pipe, HCLOHP) was dimensionally analyzed to formulate the empirical correlation. The various dimensionless groups which were supposed to influence the thermal performance of a HCLOHP was considered coupling with the quantitative results of the heat transfer...

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