Specific Consumption Analysis of Vapor Compression Refrigeration System

2017 ◽  
Author(s):  
Bai Xueliang ◽  
Zhou Shaoxiang
Keyword(s):  
Energy Savings ◽  
Real Life ◽  
Second Law Of Thermodynamics ◽  
Specific Consumption ◽  
Vapor Compression ◽  
Analysis Model ◽  
High Entropy ◽  
Energy Saving Potential ◽  
Vapor Compression Refrigeration ◽  
Exergy Balance

In real life applications the latest findings of energy savings are playing important role for optimizing and improving the systems. Vapor compression refrigeration systems are some of the most implemented refrigeration systems and most of the energy consumption in this area depends on this system. The power consumption of VCR systems cannot be obtained or compared only with the COP. In order to alleviate the above challenges, a temperature-entropy diagram of actual compression refrigeration cycle is designed to show the differences between the actual and theoretical refrigeration cycles in this research. Second law of thermodynamics was utilized to analyze the entropic and exergy balance of irreversible factors during the refrigeration process. Then specific consumption analysis model of VCR is proposed and specific consumption of specific refrigeration capacity is studied. The proposed method can obtain the actual specific consumption and distribution of the additional specific consumption. Numerical results have shown that the exergy efficiency of the VCR is lower than the COP due to high entropy generation (irreversible losses) because of electricity consumed by the system. An alternative method is introduced for the evaluation of the energy saving potential in VCR system.

Energy Savings in Air Conditioning System Using Ejector: An Overview

2014 ◽  
Vol 493 ◽  
pp. 93-98 ◽  
Author(s):  
Kasni Sumeru ◽  
Luga Martin ◽  
Farid Nasir Ani ◽  
Henry Nasution ◽  
Farid Nasir Ani
Keyword(s):  
Air Conditioning ◽  
Energy Savings ◽  
Waste Heat ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Vapor Compression Refrigeration Cycle ◽  
Performance System ◽  
Vapor Compression Refrigeration ◽  
Save Energy

There are two ejector configurations described in the present study: ejector refrigeration cycle and the ejector as an expansion device. The use of waste heat from the car engine and industry as a heat-driven energy for air conditioning system in automobile and building can save energy. Although the ejector refrigeration cycle has a low COP, the use of waste heat as a heat-driven energy incurs a lower operational cost compared with vapor compression refrigeration system. In addition, an ejector as an expansion device can be applied in the vapor compression refrigeration cycle to improve the performance system.

An Investigation of Water as a Refrigerant

1993 ◽  
Vol 115 (4) ◽  
pp. 257-263 ◽  
Author(s):  
D. Van Orshoven ◽  
S. A. Klein ◽  
W. A. Beckman
Keyword(s):  
Energy Savings ◽  
Freezing Point ◽  
Volume Flow ◽  
Heat Transfer Fluid ◽  
Working Fluid ◽  
Vapor Compression ◽  
New Type ◽  
Vapor Compression Refrigeration ◽  
Ice Production ◽  
Technical Considerations

This paper explores some of the basic thermodynamic and technical considerations involved in using water as a working fluid for refrigeration and heat pump cycles down to its freezing point of 0°C. It is first shown how the integration of the functions of refrigerant and heat transfer fluid can lead to energy savings, especially for the case of ice production. Next, the two fundamental requirements that the compressor must fulfill—handling a very large volume flow and achieving a large compression ratio—are described. A thermodynamic analysis of multistage compression follows to investigate the adiabatic head requirements and the large desuperheating irreversibility. It is concluded that a radically new type of vacuum compressor must be developed in order for water to be used as working fluid in vapor compression refrigeration cycles.

scholarly journals Exergetic performance of VCR system with TiO2-nano additive in the compressor oil

2020 ◽  
pp. 58-58
Author(s):  
Fatih Selimefendigil ◽  
HakanF. Oztop
Keyword(s):  
Exergy Analysis ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Step Method ◽  
Particle Volume ◽  
Vapor Compression Refrigeration

Exergy analysis of a vapor-compression refrigeration system with TiO2 nanoadditives in the compressor oil was performed. Two-step method was used for the preparation of nano-oil for various solid particle volume fractions between 0% and 1%. Irreversibilities were determined by using second law of thermodynamics. Reduction in total irreversibility is achieved with nanoparticle inclusion and it was significant for higher particle volume fraction.

scholarly journals Enhanced Energy Savings in Indoor Environments with Effective Daylight Utilization and Area Segregation

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1313
Author(s):  
Mohammad Asif ul Haq ◽  
Aminul Islam ◽  
ASM Shihavuddin ◽  
Md Hasan Maruf ◽  
Ahmed Al Mansur ◽  
...  
Keyword(s):  
Energy Saving ◽  
Energy Savings ◽  
Real Life ◽  
Indoor Environments ◽  
New Approach ◽  
Artificial Lighting ◽  
Energy Saving Potential ◽  
Energy Assessment ◽  
Separate Area ◽  
Multiple Levels

Daylight utilization is one of the key areas for energy savings in indoor environments. An important factor often not considered by the existing daylight utilization approaches is the segregation of the floor into task areas and non-task areas. It is also observed that the inherent asymmetry in the daylight penetration pattern in most indoor environments is not given consideration while designing artificial lighting arrangements. Moreover, daily and annual daylight availability is found to have a symmetrical variation pattern, which is a significant factor often overlooked in utilizing daylight. Thus, the energy assessment can be inaccurate, leading to an incorrect or impractical evaluation of energy savings. This research proposes a comprehensive new approach to assess the energy-saving potential of daylight utilization in indoor environments. This new method combines two approaches to overcome the aforementioned issues. (1) The considered area is segmented into task area and non-task areas (or surrounding area) and considers different levels of required illuminance for each separate area. (2) The variation of available daylight at the considered location is accounted for by dividing the daylight penetration into multiple levels. For the study, the method is first applied to a simulated office space considering real-life parameters, where the annual energy savings were estimated at 83.67%. For further validation, a comparison with a case from an existing method was also carried out, and the proposed method gave an energy saving estimation of 73.45%. This indicates a 10% higher energy saving estimation as compared to the original study, against which the proposed method was compared.

scholarly journals Review of Multi-Physics Modeling on the Active Magnetic Regenerative Refrigeration

2021 ◽  
Vol 26 (2) ◽  
pp. 47
Author(s):  
Julien Eustache ◽  
Antony Plait ◽  
Frédéric Dubas ◽  
Raynal Glises
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
Room Temperature ◽  
State Of The Art ◽  
Vapor Compression ◽  
Crucial Step ◽  
Potential Alternative ◽  
Vapor Compression Refrigeration ◽  
Preliminary Study ◽  
Physics Modeling

Compared to conventional vapor-compression refrigeration systems, magnetic refrigeration is a promising and potential alternative technology. The magnetocaloric effect (MCE) is used to produce heat and cold sources through a magnetocaloric material (MCM). The material is submitted to a magnetic field with active magnetic regenerative refrigeration (AMRR) cycles. Initially, this effect was widely used for cryogenic applications to achieve very low temperatures. However, this technology must be improved to replace vapor-compression devices operating around room temperature. Therefore, over the last 30 years, a lot of studies have been done to obtain more efficient devices. Thus, the modeling is a crucial step to perform a preliminary study and optimization. In this paper, after a large introduction on MCE research, a state-of-the-art of multi-physics modeling on the AMRR cycle modeling is made. To end this paper, a suggestion of innovative and advanced modeling solutions to study magnetocaloric regenerator is described.

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