scholarly journals Effect of Titanium Oxide Nanoparticle Additives on R22 Refrigeration System

2019 ◽  
Vol 9 (2) ◽  
pp. 3458-3460
Keyword(s):  
Titanium Oxide ◽  
Tio2 Nanoparticle ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Heat Transfer Fluids ◽  
New Energy ◽  
Oxide Nanoparticle ◽  
Compressor Work ◽  
The Impact ◽  
Cooling Model

To explore the conservation technique for energy resources and making more efficient new energy systems has init iated the demand for usage of Nanoparticle in heat transfer fluids. The study explored the impact of Nanolubricants based on Mineral refrigeration oil and Tio2 Nanoparticle at three various mass concentrations 0.6g/l,024g/l and 046g/l in a vapour confining refrigeration system. Experiments are finalized out to read the important functions of cooling models, like as coefficient of performance (C.O.P), Compressor work and refrigeration effect when titanium oxide (Tio2 ) Nanoparticle are added to the lubricant. The experiment conduced using R22 refrigerant. The process of Tio2 Nanoparticle by the cooling model was raising the cooling level of accuracy and Collaborative of task and reduction of compressor work.

scholarly journals Effect of Titanium Oxide Nano Lubricants Applied to R134a Refrigeration System

2020 ◽  
Vol 8 (5) ◽  
pp. 5557-5559
Keyword(s):  
Steady State ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Compressor Work

In this work experiment is performed by using titanium oxide (Tio2) nanoparticles at three different nanoaparticles containing lubricants 0.2g/l,0.4g/l as well as 0.6g/l . An experiment was performed by dispersing titanium oxide (Tio2) nanoparticles and the variables such as compressor work, Coefficient of performance (C.O.P) and refrigeration has been analysed.The experiment was conducted with R134a refrigerant under steady state conditions.Inclusion of Tio2 nanoparticles improved the coefficient as well as cooling capacity of presentation and the compressor work is get reduced.

scholarly journals Cop Enhancement of Vapour Compression Refrigeration System

2021 ◽  
pp. 1-6
Author(s):  
B Sairamakrishna ◽  
◽  
T Gopala Rao ◽  
N Rama Krishna ◽  
◽  
...  
Keyword(s):  
Tube Diameter ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Expansion Valve ◽  
Compressor Inlet ◽  
Work Input ◽  
Compressor Work ◽  
Vapour Compression ◽  
Design And Testing ◽  
Nozzle Inlet

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

scholarly journals Performance Analysis of Vapour Compression Refrigeration System with Serpentine and Spiral Condensers by Using R600a

2019 ◽  
pp. 21-25
Author(s):  
P. Kesavulu ◽  
K. Prahlada Rao
Keyword(s):  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Economic Output ◽  
Refrigeration Unit ◽  
Load Increase ◽  
Heating Load ◽  
Compressor Work ◽  
Cooling Loads ◽  
Vapour Compression ◽  
Ozone Depletion Potential

The present work is to analyse the performance of VCRS system with two condensers i.e., Serpentine and Spiral tube using Isobutane (R600a) refrigerant. These two condensers are kept in parallel with other components of refrigerating unit while construction. The performance of refrigeration system is checked for each condenser at various cooling loads. The performance of the condenser is measured for whole refrigeration unit in terms of C.O.P, compressor work, Efficiency of the system, Heat Rejection Ratio, and Heat Rejected from Condenser. The result will show that for both condensers for refrigerant R600a, coefficient of performance increases with increase in heating load, increase in refrigerating effect and decrease in compressor work. From the analysis of two condensers, coefficient of performance of refrigeration system using serpentine and spiral condenser VCRS is more compared to conventional VCRS. Also, R600a gives better cooling effect than tetrafluroethane (R134a). The substitution of R134a by R600a is useful in order to generate a good thermo-economic output, zero ODP (Ozone Depletion Potential) and very low GWP (Global Warming Potential).

SIMULATION OF A SIMPLE VAPOUR-COMPRESSION REFRIGERATION SYSTEM USING R134a

2016 ◽  
Vol 78 (9-2) ◽  
Author(s):  
Mohd Yusoff Senawi ◽  
Farah Wahidah Mahmod
Keyword(s):  
Steady State ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Input Coefficient ◽  
Work Input ◽  
Compressor Work ◽  
Computerized Simulation ◽  
Steady State Simulation ◽  
Vapour Compression ◽  
Isentropic Efficiency

A computerized simulation of a simple single-stage vapour-compression refrigeration system has been made. The steady-state simulation uses the accurate property correlations developed by Cleland for refrigerant R134a. The inputs to the program are: evaporator pressure, condenser pressure, superheating at evaporator outlet, subcooling at condenser outlet and compressor isentropic efficiency. The program outputs are: refrigerating effect, compressor work input, coefficient of performance (COP) and suction vapour flow rate per kW of refrigeration. An increase in the evaporator pressure from 150 to 250 kPa improves the COP by 40%. The COP is decreased by 35% when the condenser pressure is increased from 1000 to 1500 kPa. Increasing the superheat at the evaporator outlet from 0 to 160C improves the COP by 2.6%. An increase in subcooling at the condenser outlet from 0 to 160C increases the COP by 20%. The COP is improved by 150% when the compressor isentropic efficiency is increased from 0.4 to 1.

EXPERIMENTAL INVESTIGATION OF A REFRIGERATION SYSTEM WORKING UNDER TRANSIENT CONDITIONS

2014 ◽  
Vol 22 (03) ◽  
pp. 1450013 ◽  
Author(s):  
J. K. DABAS ◽  
SUDHIR KUMAR ◽  
A. K. DODEJA ◽  
K. S. KASANA
Keyword(s):  
Capillary Tube ◽  
Coefficient Of Performance ◽  
Tube Length ◽  
Design Parameters ◽  
Transient Operation ◽  
Refrigeration System ◽  
Transient Conditions ◽  
Cooling Period ◽  
Optimum Selection ◽  
The Impact

The impact of transient conditions along with varied capillary tube length and charge quantity over the performance of a simple refrigeration system under all time transient operations has been investigated in a specially designed experimental setup. A maximum drop of 75% in the coefficient of performance (COP) of the system was recorded by the end of the transient cooling period. The continuous deterioration in performance from start to end of the transient cooling job can be well minimized by the optimum selection of capillary tube length and charge quantity. This paper refers some of the existing methods to determine the appropriate length of the coiled capillary tube and charge quantity for a newly designed refrigeration machine working under steady state conditions and compares the experimental results of transient operation with these. Optimum charge quantity for transient operation in the present study is 3.5% to 5% less than that calculated by the existing analytical and numerical methods. The optimum length of coiled capillary tube for transient operation as found in this experimental study matches approximately with the length predicted by the existing dimensionless correlation on the basis of design parameters as estimated towards the end of the transient cooling period.

scholarly journals Enhancement of Cop of Vapour Compression Refrigeration System by using Diffusers

2019 ◽  
Vol 8 (2) ◽  
pp. 6123-6129
Keyword(s):  
Tube Diameter ◽  
Coefficient Of Performance ◽  
Divergence Angle ◽  
Refrigeration System ◽  
Suction Tube ◽  
Compressor Inlet ◽  
Work Input ◽  
Compressor Work ◽  
Vapour Compression ◽  
Design And Testing

This experimental investigation exemplifies the design and testing of four diffusers at compressor inlet and condenser inlet in the vapour compression refrigeration system with the help of R134a refrigerant .The Four diffusers with divergence angle of 10°,12°, 14° and 16° are designed for same inlet and outlet diameters. Diffusers are testing at compressor inlet first. The diffusers are used with inlet diameter equal to discharging tube diameter of evaporator and outlet diameter is equal to suction tube diameter of the compressor. One of the diffuser gives the better performance, it will fixed at compressor inlet. Then diffusers are testing at condenser inlet, diffuser inlet diameter equal to discharging tube diameter of compressor and outlet diameter equal to condenser inlet diameter The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance(COP). During the experimental test,the coefficient of performance (COP) of the system without diffuser and with diffuser optimized at compressor inlet and condenser inlet are find out. At compressor inlet 14° divergence angle of diffuser given the maximum cop (2.46). Percentage of increase in cop is approximately 6%. At condenser inlet 12° divergence angle of diffuser given the maximum cop (2.59).Percentage of increase in cop is approximately 3%.

scholarly journals Cop Enhancement of Vapour Compression Refrigeration System

2021 ◽  
Vol 1 (2) ◽  
pp. 1-6
Author(s):  
Sairamakrishna B ◽  
T Gopala Rao ◽  
Rama Krishna, N
Keyword(s):  
Tube Diameter ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Expansion Valve ◽  
Compressor Inlet ◽  
Work Input ◽  
Compressor Work ◽  
Vapour Compression ◽  
Design And Testing ◽  
Nozzle Inlet

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Thermodynamic Performance Analysis of Hydrocarbon Based Domestic Refrigeration System

2021 ◽  
Vol 7 (1) ◽  
pp. 19-36
Author(s):  
Haile Gebrehiwet Seyoum ◽  
Keyword(s):  
Performance Analysis ◽  
Life Time ◽  
Good Alternative ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Discharge Temperature ◽  
Thermodynamic Performance ◽  
Work Input ◽  
Compressor Work ◽  
R 134A

The use of synthesized refrigerants has several environmental concerns. The most widely used substances like hydro fluorocarbons (HFCs), chlorofluorocarbons (CFCs) and hydro chlorofluorocarbons (HCFCs) have either high global warming potential (GWP), high ozone depletion potential (ODP) or long atmospheric life time. With the growing demand of healthier atmosphere, the study of other alternative substances is very important. This paper presents theoretical thermodynamic performance analysis of hydrocarbon based domestic vapour compression refrigeration system. Propane (R-290), isobutane (R-600a) and butane (R-600) were used. Then, the results were compared with the performance of currently most commonly used tetrafluoroethane (R-134a). These hydrocarbons have zero ODP and very negligible GWP. Different parameters, like coefficient of performance (COP), refrigeration effect, compressor work input and compressor discharge temperature were investigated. Evaporator and condenser temperatures, subcooling, superheating and compressor isentropic efficiency were the variables used for this study. MATLAB software has been used in the mathematical analysis. COP values were found comparable to that of R134a. All the hydrocarbons investigated gave beyond 150% refrigeration effect compared to R-134a for the same mass flow rate. But this was at the expense of higher compressor work input. This research also revealed that the compressor discharge temperature is much lower for R-600a and R-600. Generally, these hydrocarbons showed that they are a good alternative to R134a based on the thermodynamic point of view.

scholarly journals Cop Enhancement of Vapour Compression Refrigeration System

2021 ◽  
Vol 1 (2) ◽  
pp. 1-6
Author(s):  
Sairamakrishna B ◽  
T Gopala Rao ◽  
Rama Krishna N
Keyword(s):  
Tube Diameter ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Expansion Valve ◽  
Compressor Inlet ◽  
Work Input ◽  
Compressor Work ◽  
Vapour Compression ◽  
Design And Testing ◽  
Nozzle Inlet

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

scholarly journals Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

2021 ◽  
Author(s):  
Solomon O. Banjo ◽  
Bukola O. Bolaji ◽  
Oluseyi O. Ajayi ◽  
Olatunde A. Oyelaran
Keyword(s):  
Global Warming ◽  
Air Conditioning ◽  
Energy Reduction ◽  
Coefficient Of Performance ◽  
Working Fluid ◽  
Refrigeration System ◽  
Compressor Work ◽  
And Performance

The effect of heat transfer medium (HTM) on the environment is associated with ozone layer depletion and global warming. The role of HTM (working fluid) in the heating and air conditioning industries is paramount, which cannot be underestimated. The conventional refrigerant has been predominantly used over decades due to their thermodynamic properties. However, hydrocarbon refrigerants such as isobutane are considered substitutes because they have negligible global warming potential and zero ozone depletion. That makes it eco-friendly among other existing refrigerants. The investigation of the refrigeration system’s performance characteristics required consideration for the coefficient of performance, refrigerating effect, and the compressor work; this enables the determination of the system’s efficiency without any assumption. Another factor that suggests a better absorption of refrigerant (working fluid) into a refrigeration system is an increase in the coefficient of performance (COP). The effect will cause a reduction in the rate of energy consumption by the compressor. The result shows that the system’s coefficient of performance when using R600a was 27.1% higher than when working with R134a, with an energy reduction of 23.3%.

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