refrigerator Articles
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Realistic limitations to the operation of heat-driven refrigerators
The optimal characteristic curve relating the COP and the refrigeration rate of an irreversible heat-driven refrigerator is established on the basis of a thermodynamic model which combines the endoreversible model and the heat leak insulation model. It is found that the curve is loop-shaped and that both the refrigeration rate and the COP exhibit a maximum. In addition, it is shown that the curve ...
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Optimisation of an irreversible Carnot refrigerator working between two heat reservoirs
A model of finite-resources optimisation for irreversible refrigerators is presented in this paper. An irreversible Carnot refrigerator operating between two heat reservoirs is analysed. Several important optimum results, subject to different resource constraints have been obtained. The relations among these results are also discussed. The results obtained here shows that the finite-resources ...
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Exergy based refrigerant selection and simulation of auto refrigeration cascade (ARC) system
This paper deals with the selection of refrigerants and simulation of Auto Refrigeration Cascade (ARC) system, which is generally used for low temperature applications in the range of -40 to -150°C that operates with zeotropic mixture, containing two or more refrigerants with different boiling points. The selection of refrigerants depends on the working pressure and temperature range of ...
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Irreversibility analysis of a compression refrigeration cycle using natural refrigerants for a sustainable future
Irreversibility analyses of R290, R717, R718 and R744 are carried out in a compression refrigeration cycle. The effects of evaporator temperature, condenser temperature and isentropic efficiency on the irreversibility of the cycle and its basic components are investigated and exergy analysis of the cycle is also presented as a function of evaporator and condenser temperatures. The ...
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Thermodynamic modelling and optimisation of an irreversible heat driven refrigeration plant
Thermodynamic modelling and optimisation of a real heat driven refrigeration plant is performed on the basis of the two considerations that: (i) it can be assimilated to the couplage of a power plant and a work input refrigerator; and that: (ii) the irreversibility of each plant can be regarded as due to a bypass heat leak taking place in parallel with an otherwise irreversibility free ...
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Thermo-ecological performance optimisation of two stage irreversible refrigerators
The present study investigates the optimal performance of two stage refrigeration system based on thermo-ecological performance criterion. To maximise the ecological performance function, the working fluid temperatures are optimised. The optimal conditions such as cooling load, entropy generation rate and Coefficient of Performance (COP) are arrived analytically. The derived solution provides a ...
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What is a ton of refrigeration?
Commercial refrigeration systems in the US are mostly rated in tons of refrigeration and this term is used widely in other parts of the world. However, outside the US, cooling systems may be normally specified in kW (or MW) or in Btu/h. The roots for refrigeration are in the ice making industry, and the ice manufacturers wanted an easy way of understanding the size of a refrigeration system in ...
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Exergy analysis of vortex tube expansion vapour compression refrigeration system
Performance comparisons of two vapour compression refrigeration cycles (CYC1 and CYC2) based on the exergetic analysis with three natural refrigerants: ammonia, propane and isobutane are presented using vortex tube as an expansion device. Effects of various operating and design parameters on the performance improvement are presented. Results are shown that the exergetic efficiency improvement ...
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Omani Bedouins' readiness to accept solar thermoelectric refrigeration systems
In this work, a portable solar thermoelectric refrigerator was built in order to help Bedouin people living in remote parts of Oman. The purpose of the study was to demonstrate the feasibility of the implementation of the fabricated solar thermoelectric refrigerator. To this end, a survey questionnaire was conducted in order to evaluate the willingness of the Bedouin to buy the designed unit. ...
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Thermodynamic and thermoeconomic analysis of subcooled and superheated vapour compressed refrigeration system using R152A, R410A and R600A
In this study, thermodynamic and thermoeconomic analysis procedures are applied to a subcooled and superheated vapour compression refrigeration system for different refrigerants. By thermodynamic analysis, Coefficient of Performance (COP), irreversibilities and exergetic efficiencies of a theoretical refrigeration system are determined to evaluate the system performance. With the thermoeconomic ...
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Performance characteristics of a novel ejector-expansion transcritical CO2 refrigeration cycle with gas cooler exergy utilisation
In this paper, a novel configuration of ejector-expansion transcritical CO2 (TRCC) refrigeration cycle was presented. A gas cooler exergy was utilised by a supercritical CO2 power cycle to enhance the performance of the presented cycle. Theoretical analysis on the performance characteristics was carried out for the cycle on the basis of the first and second laws of thermodynamics. A parametric ...
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Exergy analysis of a two-stage refrigeration cycle using two natural substitutes of HCFC22
The aim of the present paper is to carry out a detailed exergy analysis of a two-stage vapour compression cycle by calculating its components exergetic losses. The exergy equations have been developed using refrigerant thermodynamic properties computed by means of a simple model of local equations of states. The results of the exergy analysis of a two-stage refrigeration system operating between ...
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Exergy analysis of a Vapour Compression Refrigeration system with R-22, R-407C and R-410A
The parametric investigations of actual Vapour Compression Refrigeration (VCR) cycle in terms of Coefficient of Performance (COP), Exergy Destruction (ED) and exergetic efficiency of refrigerants R-22, R-407C and R-410A have been predicted with the help of a developed computational model. The present investigation has been carried out for evaporator and condenser temperatures in the range of ...
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Exergy analysis of a diffusion absorption refrigeration system
An energetic and exergetic study on a diffusion absorption refrigerator (DAR) is presented in this paper. It uses ammonia as the refrigerant, water as the absorbent and hydrogen as the auxiliary gas. A computer model has been developed to calculate the thermodynamic properties of all state points, heat flow rates, exergy losses and COP degradation in each component of the system. The system ...
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Heavy refrigerators are turning easily with the fridge turner
New handling system for refrigerator degassing ATN receives more and more requests from customers (especially from outside Europe) for automatic handling systems. Refrigerators are becoming bigger and heavier. In countries like the USA the weight of a refrigerator can be well over 150kg. In order to avoid manual handling of these big refrigerators during the degassing process ATN developed an ...
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Optimisation of visi cooler with the low global warming potential refrigerant mixture as an alternative to R134a and HC blend
In this study, the performance of a visi cooler has been evaluated by using the ternary mixture of R134a/R290/R600a with five different mass fractions as an alternative to R134a and HC mixture. Baseline tests have been carried out with R134a and HC mixture and the performance parameters were compared with the five selected alternative refrigerant mixtures. The performance is optimised by varying ...
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Qingdao Newtep dry ice, granular dry ice, columnar dry ice, block dry ice, dry ice
The specifications of Qingdao Newtep dry ice are as follows: Granular dry ice: Millet granular dry ice with a diameter of 3mm: commonly used for dry ice cleaning. Of course, it can also be used for refrigeration, cooling, and stage smoke effects; Columnar dry ice: Columnar dry ice with a diameter of 16mm-19mm, food-grade dry ice, commonly used in refrigeration and freezing, fresh-keeping ...
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Exergy analysis of hydrocarbons mixture refrigerants R436A and R436B as a drop in replacement for R134a with TiO
2nanoparticlesThe refrigerator exergy efficiency (EE) with nanoparticles in the working fluid was investigated experimentally. Mineral oil (MO) with TiO2 nanoparticles mixtures were used as the lubricant instead of Polyol ester (POE) oil in the R134a, R436A (R290/R600a–56/44–weight %) and R436B (R290/R600a–52/48–weight %) refrigerator. The results indicate that R134a, R436A and R436B and MO with TiO2 ...
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Simulation of dual Ammonia Absorption Refrigeration cycle for effective utilisation of low temperature heat source
The aim of the work is to study absorption refrigeration cycle so that low temperature heat sources can be utilised for producing refrigeration. A dual cycle, which is a combination of two separate AAR cycles, is simulated, where the evaporator of the first cycle is coupled with the condenser or absorber of the second cycle. Such a dual cycle enables utilisation of low temperature heat source. ...
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“FridgeFree™” - The permanent natural solution to leaking refrigerators
Cleveland Biotech Ltd has recently developed another market defining biological product - FridgeFree™. This is the natural solution to the problem of leaking refrigerators caused gel blockages condensate drains. Cleveland Biotech Ltd has recently developed another market defining biological product – FridgeFree™. This is the natural solution to the problem of gel blockages in ...
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