Performance evaluation of Ammonia Absorption Refrigeration cycle based on Exergetic Coefficient of Performance

2007 ◽  
Vol 4 (1) ◽  
pp. 19 ◽  
Author(s):  
Y.C. Hasabnis ◽  
S.S. Bhagwat
Keyword(s):  
Performance Evaluation ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Ammonia Absorption

scholarly journals Thermo-Economic Comparisons of Environmentally Friendly Solar Assisted Absorption Air Conditioning Systems

2021 ◽  
Vol 11 (5) ◽  
pp. 2442
Author(s):  
Adil Al-Falahi ◽  
Falah Alobaid ◽  
Bernd Epple
Keyword(s):  
Cooling System ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Parabolic Trough ◽  
Solar Absorption ◽  
Evacuated Tube Collectors ◽  
Solar Absorption Cooling ◽  
Solar Field

Absorption refrigeration cycle is considered a vital option for thermal cooling processes. Designing new systems is needed to meet the increasing communities’ demands of space cooling. This should be given more attention especially with the increasing conventional fossil fuel energy costs and CO2 emission. This work presents the thermo-economic analysis to compare between different solar absorption cooling system configurations. The proposed system combines a solar field, flashing tank and absorption chiller: two types of absorption cycle H2O-LiBr and NH3-H2O have been compared to each other by parabolic trough collectors and evacuated tube collectors under the same operating conditions. A case study of 200 TR total cooling load is also presented. Results reveal that parabolic trough collector combined with H2O-LiBr (PTC/H2O-LiBr) gives lower design aspects and minimum rates of hourly costs (5.2 $/h) followed by ETC/H2O-LiBr configuration (5.6 $/h). H2O-LiBr gives lower thermo-economic product cost (0.14 $/GJ) compared to the NH3-H2O (0.16 $/GJ). The absorption refrigeration cycle coefficient of performance ranged between 0.5 and 0.9.

Performance Evaluation of Solar Energy Driven Diffusion Absorption Refrigeration Cycle Using Inorganic Fluid Pair

2018 ◽  
Vol 26 (04) ◽  
pp. 1850031 ◽  
Author(s):  
Kishan Pal Singh ◽  
Onkar Singh
Keyword(s):  
Computer Simulation ◽  
Performance Evaluation ◽  
Solar Energy ◽  
Thermodynamic Modeling ◽  
Air Conditioning ◽  
Ammonia Concentration ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Simulation Based ◽  
Diffusion Absorption

In the present era, the refrigeration and air conditioning have become essential requirements, and consume significant portion of energy available. The refrigeration requirements are severe in the hot and humid countries and, the refrigeration systems based upon solar energy are desirable. This study focuses on the thermodynamic modelling of ammonia water diffusion absorption refrigeration cycle with helium as pressure equalizing gas. The performance of the cycle is investigated parametrically by computer simulation based on thermodynamic modeling. It is found that the performance shows a loss of 37.36% at 110[Formula: see text]C while only 23.52% at 140[Formula: see text]C a generator temperature in the range of 120 to 150[Formula: see text]C is best suited for ammonia concentration range of 0.25–0.45 to get optimum performance.

A theoretical and experimental study of a novel recompression absorption refrigeration cycle

2001 ◽  
Vol 215 (1) ◽  
pp. 75-87 ◽  
Author(s):  
I. W. Eames ◽  
S Wu
Keyword(s):  
Experimental Study ◽  
Theoretical Study ◽  
Lithium Bromide ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Corrosion Rates ◽  
Steam Ejector ◽  
Single Effect ◽  
Absorption Cycle

This paper describes a novel vapour absorption refrigeration cycle which uses a steam ejector to enhance the concentration process of the cycle. The paper provides a complete description of the cycle and presents the results of a theoretical study before going on to describe and evaluate the outcomes of an experimental programme. The results of this investigation showed that with the addition of a steam ejector as described the coefficient of performance (COP) of the single-effect lithium bromide absorption cycle can be increased from about 0.7 to at least 1.0 without any increase in corrosion rates often associated with high temperature vapour generators used in conventional machines of this type.

scholarly journals Theoretical Study of Photovoltaic Thermal Integrated Absorption Cooling System under Jordan Climate

2019 ◽  
Vol 2 (1) ◽  
pp. 76-85
Author(s):  
Mohammed Al-Odat
Keyword(s):  
Energy Consumption ◽  
High Efficiency ◽  
Cooling System ◽  
Electrical Energy ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Climate Conditions ◽  
Absorption Refrigeration System

This paper presents a theoretical investigation to simulate the utilization of (PV/T) technology to drive an absorption refrigeration system that is used for air conditioning of a classroom under Jordan climate conditions. The absorption refrigeration cycle uses the hot water from the PV/T collector with an assisted electrical heater as a heat source in the generator. In addition to the capability to utilize the PV/T to supply the building by domestic hot water and electricity if no need to run the refrigeration cycle. This analysis was carried using excel program and theoretical equations for the system. It was found that (PV/T) technology is very useful for thermal applications with high efficiency. Also, absorption refrigeration cycle has a good coefficient of performance because it main ly depends on the thermal energy with low electrical energy consumption to run the pump. Moreover, this system has a short payback period, low energy consumption, low running cost, and minimum environmental impact. The results of this study show that the system needs about (84 m 2 PV/T collectors) to cover 16 tons cooling load.

scholarly journals Thermodynamic Performance of a Double-Effect Absorption Refrigeration Cycle Based on a Ternary Working Pair: Lithium Bromide + Ionic Liquids + Water

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4200 ◽  
Author(s):  
Yiqun Li ◽  
Na Li ◽  
Chunhuan Luo ◽  
Qingquan Su
Keyword(s):  
Least Squares Method ◽  
Operating Temperature ◽  
Double Effect ◽  
Coefficient Of Performance ◽  
Specific Enthalpy ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Temperature Range ◽  
Thermodynamic Performance ◽  
Operating Temperature Range

For an absorption cycle, a ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O was proposed as a new working pair to replace LiBr/H2O. The thermodynamic properties including specific heat capacity, specific enthalpy, density, and viscosity were systematically measured and fitted by the least-squares method. The thermodynamic performance of a double-effect absorption refrigeration cycle based on LiBr–[BMIM]Cl(2.5:1)/H2O was investigated under different refrigeration temperatures from 5 °C to 12 °C. Results showed that the ternary working pair LiBr–[BMIM]Cl(2.5:1)/H2O had advantages in the operating temperature range and corrosivity. Compared with LiBr/H2O, the operating temperature range was 20 °C larger, and the corrosion rates of carbon steel and copper were reduced by more than 50% at 453.15 K. However, the double-effect absorption refrigeration cycle with LiBr–[BMIM]Cl(2.5:1)/H2O achieved a coefficient of performance (COPc) from 1.09 to 1.46 and an exergetic coefficient of performance (ECOPc) from 0.244 to 0.238, which were smaller than those based on LiBr/H2O due to the higher generation temperature and larger flow ratio.

Effect of Operating Temperature on the Performance and Thermal Load of Water/Lithium Bromide Vapour Absorption Heat Pump in the Absence of Solution Heat Exchanger

2014 ◽  
Vol 592-594 ◽  
pp. 1510-1514
Author(s):  
S. Manu ◽  
T.K. Chandrashekar ◽  
A.J. Antony
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Thermal Load ◽  
Operating Temperature ◽  
Lithium Bromide ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Efficiency Ratio ◽  
Absorption Heat Pump

In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures .

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