Single-effect Absorption Chiller Research Articles

Thermodynamic investigation of an innovative solar-driven trigeneration plant based on an integrated ORC-single effect-double lift absorption chiller

Maximizing the synergy between renewable resources and efficient multi-generation systems is crucial for transitioning the energy sector towards carbon-free production. The objective of this research paper is to investigate and optimize the performance of an integrated solar trigeneration plant. Electrical load and domestic heating supply are provided through an organic Rankine cycle and heat exchanger respectively. Cooling needs are provided using a single-effect double-lift absorption chiller (SE-DL ACH), a novel combination seldom encountered within multigeneration systems. Various collectors are evaluated, and an initial screening of organic fluids is done. A comprehensive analysis framework is developed, considering energy, exergy, and the sequence of energy usage, which is clarified into sequential (SSI) and parallel (PSI) integration.The final result indicates that n-decane is the most appropriate fluid, yielding thermal and electrical efficiencies of 11.93 % and 5 kW, respectively. Among the collectors evaluated, EFPC emerges as the most promising. SSI delivers electrical, cooling, and heating output of 5 kW, 105.7 kW, and 29.25 kW, with energy and exergy efficiencies of 45.6 % and 41.3 %. PSI demonstrates an improvement of 11.92 % and 43.08 % in cooling and heating generation. It exhibits an energy and exergy efficiency of 43.03 % and 37.26 %. Integrating the SE-DL parallel to the heat source has improved the potential of heat recovery by 22.22 %.

Design and optimization of a geothermal absorption cooling system in a tropical climate

The electricity required for air conditioning is soaring worldwide. Absorption chillers represent an alternative to classical vapor compression systems, using heat instead of electricity. However, absorption chillers powered by renewable geothermal heat have received little attention so far. This paper introduces a system using a hot geothermal fluid (typically in the range of 80–110 °C) to produce cooling through a single-effect absorption chiller, and Domestic Hot Water (DHW) through a heat exchanger. It considers a hotel located in Martinique, a French Caribbean island. The electric consumption of every subsystem has been thoroughly estimated. The originality of this paper is twice: i) the system is modelled in TRNSYS software considering dynamic conditions, ii) the system undergoes surrogate modelling and multi-objective optimization to minimize both the cost and the CO2 content of the delivered thermal energy. Several scenarios are considered, depending upon the geothermal temperature, mass flow rate, well remoteness, and demand size. The studied system appears to be systematically more expensive than a combination of a classical vapor compression chiller and a boiler for DHW. However, it can significantly decrease the CO2 content of the provided energy, especially in an island where most electricity is generated from fossil fuels. The proximity of the geothermal well and the use of the warm water leaving the absorption generator (here for DHW production) appear to be key factors for system relevance, along with a hotter geothermal fluid (e.g., 110 °C instead of 80 °C).

Thermodynamic modeling and exergy analysis of a gas turbine and fuel cell hybrid system (SOFC + GT) equipped with single-effect and double-effect absorption chillers

Thermodynamic modeling and exergy analysis of a gas turbine and fuel cell hybrid system (SOFC + GT) equipped with single-effect and double-effect absorption chillers

Exergoeconomic Evaluation of a Cogeneration System Driven by a Natural Gas and Biomass Co-Firing Gas Turbine Combined with a Steam Rankine Cycle, Organic Rankine Cycle, and Absorption Chiller

Considering energy conversion efficiency, pollution emissions, and economic benefits, combining biomass with fossil fuels in power generation facilities is a viable approach to address prevailing energy deficits and environmental challenges. This research aimed to investigate the thermodynamic and exergoeconomic performance of a novel power and cooling cogeneration system based on a natural gas–biomass dual fuel gas turbine (DFGT). In this system, a steam Rankine cycle (SRC), a single-effect absorption chiller (SEAC), and an organic Rankine cycle (ORC) are employed as bottoming cycles for the waste heat cascade utilization of the DFGT. The effects of main operating parameters on the performance criteria are examined, and multi-objective optimization is accomplished with a genetic algorithm using exergy efficiency and the sum unit cost of the product (SUCP) as the objective functions. The results demonstrate the higher energy utilization efficiency of the proposed system with the thermal and exergy efficiencies of 75.69% and 41.76%, respectively, while the SUCP is 13.37 $/GJ. The exergy analysis reveals that the combustion chamber takes the largest proportion of the exergy destruction rate. The parametric analysis shows that the thermal and exergy efficiencies, as well as the SUCP, rise with the increase in the gas turbine inlet temperature or with the decrease in the preheated air temperature. Higher exergy efficiency and lower SUCP could be obtained by increasing the SRC turbine inlet pressure or decreasing the SRC condensation temperature. Finally, optimization results indicate that the system with an optimum solution yields 0.3% higher exergy efficiency and 2.8% lower SUCP compared with the base case.

Downsizing strategy for an air-cooled indirect-fired single-effect ammonia-water absorption chiller in part-load operation in hot climates

A modular mathematical model has been created to simulate an ammonia-water absorption refrigeration system indirectly fired and air-cooled. The model includes governing equations based on mass, species, and energy balances, implemented for the main components of the system. It accounts for both thermal and mass resistances in the transfer processes that occur in the system. The study evaluates the performance of the ROBUR® absorption refrigeration system, model ACF60-00 LB, operating under part-load conditions, driven by hot water temperatures ranging between 160 and 210 °C, while the ambient temperature remains up to 40 °C. This refrigeration system is characterised by including an extra valve that allows active control of the pressure levels of the system. The analysis focusses on the effect of its active control on the size of the system. The results show that increasing the pressure loss in this valve reduces the size of the air-cooled absorber to 37.3 % of its nominal size at an ambient temperature of 40 °C, while the reduction in refrigerant mass flow is 18.5 %, while the condenser size decreases 3.1 times. Evaporator, air-cooled absorber and condenser effectiveness are minimally affected. Additionally, contribution of condenser and evaporator to exergy destruction is balanced.

Thermodynamic and economic evaluation of a CCHP system with biomass gasifier, Stirling engine, internal combustion engine and absorption chiller

This work proposes a combined cooling, heating and power (CCHP) system based on biomass gasification with an internal combustion engine (ICE), a Stirling engine and an absorption chiller. The energy and exergy efficiencies and economic performance of the CCHP are evaluated under different working conditions by thermodynamic model and net present value method. The Stirling engine recovers the high temperature potential of syngas during cooling process and improves the CCHP output power by 14 % along with ICE, while the thermal efficiency of ICE reaches 39 % at 5000 rpm. In this work, about half of the total exergy destruction comes from ICE rather than gasifier due to the utilization of Stirling engine as an additional mover to produce electricity. The recycling of weak solution in absorber is adopted in order to increase the COP (Coefficient of performance) of single-effect absorption chiller. The COP could be increased by 7 % and reach 76 % as half of the weak solution recycling to absorber. The electric efficiency and total CCHP efficiency of this system reach 37 % and more than 60 %, respectively. The payback period is estimated to be less than 6 years at an ICE rotational speed of over 4000 rpm and an operation time of more than 4000 h/year.

Comparison between two LiBr–H2O absorption-compression chillers and a simple absorption chiller driven by various solar collectors: Exergy-economic performance and optimization

Although some studies have been conducted on various types of compressor-based absorption chillers (ACH), a comprehensive comparison of the performances of these configurations has not been made. In addition, selecting a proper solar collector in combination with the best compressor-based ACH is worthwhile as solar energy is widely available during the summer season. For this purpose, the exergy-economic performances of 12 LiBr–H2O chiller configurations are compared in the present study to produce 100 kW of cooling. The configurations are a single-effect ACH and two absorption-compression chillers (ACCH) driven by 4 collector types, namely, a flat plate collector (FPC), an evacuated tube collector (ETC), a parabolic trough collector (PTC), and a compound parabolic collector (CPC). In ACCH 1, a compressor is embedded between the evaporator and the absorber of the ACH. In ACCH 2, a compressor is employed between the generator and the condenser of the ACH. The outcomes of the research indicate the superiority of the PTC and ETC over the two other collector types in terms of exergy efficiency and economic performance, respectively. The highest exergy efficiency and lowest total cost rate are calculated as 4.8% and 23.58 $h−1, which are obtained by the PTC-driven ACCH 1 and ETC-driven ACCH 1, respectively. Nevertheless, the unit cost of cooling produced by these two layouts is too high compared to the other configurations. Hence, they cannot be selected as the best configuration. Instead, the ETC-driven ACCH 2 is selected as the best configuration since it brings about the lowest unit cost of cooling (20.45 $GJ−1), and it has acceptable values of exergy efficiency (4.11%) and total cost rate (29.3 $h−1).

Exergetic and energetic evaluation of a modified tc-CO2 refrigeration system assisted with an absorption chiller using natural refrigerants

Transcritical CO2 (tc-CO2) refrigeration system is a pertinent option for refrigeration at low temperature, but it has high energy consumption with low coefficient of performance (COP) and exergetic efficiency. Thermodynamic properties of CO2 are favorable to be used as refrigerant with zero ozone depletion potential (ODP) and very low global warming potential (GWP). The tc-CO2 system rejects a huge amount of energy at higher temperature in the gas cooler which can be utilized to run the absorption chiller and produce desired cooling effect, in various combinations. The current research focuses on the energy and exergy analysis of a tc-CO2 refrigeration system that aspires to accomplish low-temperature refrigeration. A single-effect absorption chiller is used to give subcooling to the tc-CO2 refrigeration system, which is powered by the heat available at high temperatures and pressures at the exit of the compression process of the former system, rather than any other external heat source. A work recovery turbine is also used as the expansion device to reduce throttling losses and electricity consumption to power the integrated system. The parametric study reveals that there is a significant improvement in the refrigerating capacity, COP and exergetic efficiency of the system.

Hybrid cooling and heating absorption heat pump cycle with thermal energy storage

This study presents a hybrid cooling/heating absorption heat pump with thermal energy storage. This system consists of low- and high-pressure absorber/evaporator pairs, using H2O/LiBr as the working fluid, and it is driven by low-temperature heat source of 80 °C to supply cooling and heating effects simultaneously. Using solution and refrigerant reservoirs, the system can store thermal energy in the form of chemical potential owing to the concentration glide. Applying the building cooling/heating temperature conditions, the operating concentration range of the system is constrained to 0.49–0.59 LiBr mass fraction. In this range, a system performance analysis is conducted through simulation modeling. The maximum total COP of the hybrid heat pump cycle reaches 0.80, which is same as the maximum COP of the single-effect absorption chiller with the same operating conditions. In storage mode, the maximum total COP is reduced to 0.30 due to the lack of internal heat recovery, while a maximum energy storage density (ESD) of 402.4 kJ/kg is achieved. In particular, the performance of the storage mode is dominantly affected by the solution circulation ratio, indicating the design criteria for the proposed system.

Thermal modelling and analysis of a novel solar integrated waste-to-energy plant for sustainable society

Waste-to-energy incineration is an effective and sustainable solution to reduce produced waste and simultaneously generates electricity utilizing thermal energy. The waste-to-electrical efficiency of conventional incineration plants is limited to 20–25% due to the higher amount of moisture content in the feedstock and flue gas heat losses. In addition, tubes of the incineration boiler are subjected to corrosion problems at elevated temperatures. In the present research, a parabolic trough solar-integrated municipal solid waste power plant is proposed and thermodynamically evaluated for different useful outputs. The solar energy is harvested through parabolic trough collectors to reheat the working fluid of the incineration plant to increase the steam temperature before it is fed to the low-pressure turbine. Meanwhile, a single-effect absorption chiller is integrated to utilize the thermal energy of the trough collectors for cooling purposes. In addition, the thermal energy of flue gas is used to power an organic Rankine cycle that further drives a proton exchange membrane and reverse osmosis desalination unit for hydrogen and freshwater production, respectively. In this way, the steam temperature for reheating the low-pressure turbine is increased to further improve the performance of the proposed solar-integrated waste-to-energy plant without causing any corrosion problems to the incineration boiler. The integrated facility is thermodynamically analyzed based on a 560-tons/day incineration plant using the engineering equation solver (EES) software. The results indicate that the overall energy and exergy efficiencies of the proposed plant are 32.51% and 23.7%, respectively, while the coefficient of performance of the absorption chiller is 0.849. Moreover, it is concluded that the produced desalinated water and hydrogen rates are 23.96 kg/s and 0.000857 kg/s, respectively.

Techno-economic-environmental study of an innovative solar-boosted system to produce low-emission hydrogen and methanol: ANN-based optimization

In the present study, techno-economic-environmental optimization of a solar-boosted energy system generating power, freshwater, and methanol as a promising clean fuel has been undertaken. A heliostat field with variable mirrors is used in a gas turbine cycle to decrease the necessity of burning much hydrocarbon fuel. By using pressure swing adsorption, 80% of the contained carbon dioxide of the exiting stream of the gas turbine is recovered and stored. In addition, by exploiting the waste heat of the exiting stream of the gas turbine, an organic Rankin cycle, a multi-effect distillation with thermal vapor compression, and a single effect absorption chiller are driven. Furthermore, a proton exchange membrane electrolyzer is utilized to generate hydrogen and portions of stored hydrogen and carbon dioxide go through the methanol synthesis reaction to produce desired methanol. A comprehensive parametric study through the 4E analysis has been carried out to detect the influential design parameters to set the decision variables for the optimization process. In the end, due to the complexity of the system, a deep neural network is developed to lower the computational time. The findings of the deep neural network-based optimization show the optimal solution in which the total cost rate of the system, exergy efficiency, and the emitted carbon dioxide values are 1.26 $/s, 46.25%, and 0.58 kg/s, respectively.

Modeling and Performance Evaluation of Hybrid Solar Cooling Systems Driven by Photovoltaic and Solar Thermal Collectors—Case Study: Greenhouses of Andalusia

Sustainable greenhouses have gained relevance in recent years due to their potential to reduce the carbon footprint of the agricultural sector by being integrated with renewable systems, contributing to the decarbonization of energy. Although solar technologies tend to be more accessible to cover the system’s energy demands, greenhouses are subject to installation area restrictions, limiting their energy potential. This research evaluates the energy advantages of hybridizing solar thermal collector fields with photovoltaic module fields to cover a greenhouse’s cooling and heating demands. For this purpose, the solar thermal field and the photovoltaic solar system were simulated with TRNSYS and MATLAB, respectively, while a method was developed to simulate the performance of a single-effect absorption chiller that was validated using the temperature measurements of a chiller in operation. The results show that the general method maintains differences between measurements and simulation smaller than 5% with set temperatures between 5.5 and 12 degrees Celsius. The hybrid system, with an air-to-water chiller as the main machine and absorption chiller, reached a solar fraction of 0.85 and a fractional energy saving of 83%. This represents a 27% reduction in area concerning an individual solar thermal system. This research highlights that the solar hybrid configuration reduces fossil energy consumption by improving the global efficiency of energy conversion, thereby reducing the area of the solar field.

Development of a method for predicting the transient behavior of an absorption chiller using artificial intelligence methods

Absorption chillers are complex equipment compared to mechanical chillers due to their nature of heat and mass transfer processes, working fluids used, and their limitations, such as crystallization problems and dealing with vacuum pressures. Even more, when their dynamic behavior is conducted, it leads to a challenging study due to the simultaneous heat and mass transfer present in the thermal compressor. In line with this, the need to know or measure the values of internal parameters, such as temperature, concentration, and internal flows. To perform the measuring leads to using complex physical models to simulate the transient behavior, making it hard to adapt more efficient control strategies. Hence, this work proposes a methodological strategy to determine the transient behavior of a LiBr/H2O single-effect absorption chiller through intelligent regression methods. The methodology was developed by analyzing external data from an absorption refrigeration system's hot, cold, and chilled water circuits, characterizing regression models exclusively with temperature inputs, and using four machine learning methods, such as linear regression, decision tree, random forest, and artificial neural network. One novelty of the work is the integration of the first law of thermodynamics and the heat exchanger characteristic equation with machine learning methods, such as linear regression (LR), decision tree (DT), random forest (RF), and artificial neural network (NN) to estimate the dynamic of absorption chillers through exclusively external data such as temperature and flow, and nominal data of the heat exchangers. Another novelty is the capacity to determine the internal conditions of the equipment, considering a full or partial operation. The validation and calibration procedure established that all the methods applied (LR, DT, RF, and NN) presented a good fit showing values above 0.95 of the correlation coefficient R2 and RMSE values less than 0.1. The results showed that the strategy allows for estimating the transient behavior of the outlet temperature profiles of the hot, cold, and chilled water circuits. The behavior parameters were calculated with reasonable accuracy showing errors of less than 1 % for all methods applied. The thermal COP value estimated was approximately 0.71 ± 0.05, within the values presented by the equipment manufacturer. Regarding the results, the proposed strategy represents a robust and accurate dynamic analysis tool for absorption chillers operating at full or partial load.

Exergy analysis and finite-time assessment of a multi-generation system based on solar and wind energies

This paper studies a multi-generation system by exergy and finite-time assessment based on solar and wind energies. The proposed system provides electricity, cooling, heating, hydrogen, desalinated water, and domestic hot water. The subsystem includes a solar cycle, Kalina cycle, wind turbine, electrolyzer, single-effect absorption chiller, photovoltaic panel, and desalination unit. The multi-generation system studied in Bandar Abbas climate of Iran. The results reveal that the total exergy destruction of the system is 440.4707 kW, 42.86% of this is related to the solar collector, and 25.18% is associated with the wind turbine. Also, the maximum energy efficiency of the multi-generation system is 79.55% in the spring equinox and 17.77% in the summer solstice. In addition, the optimisation of the system based on thermodynamic and economic criteria show that the maximum power, energy & exergy efficiencies, maximum ecological and ecologicost are 398 kW, 63.36%, 16.68%, –49.2273 kW, and –0.000091433 kW/$, respectively. Finally, by using the ecologicost criterion, the proposed system can produce 0.015 kg/s hydrogen.

3E thermodynamic modeling and optimization a novel of ARS-CPVT with the effect of inserting a turbulator in the solar collector

In the present work, thermodynamic and economic modeling of a single-effect absorption chiller cycle to a photovoltaic solar system has been investigated. Modeling with three perspectives of optical analysis, computational fluid dynamics, and thermodynamics is considered to be coupled together. Solar energy has been used to drive the absorption chiller cycle and production of cooling for residential buildings. Solar centralization system including solar panels, fluid flow is used to generate and store electricity, usage in the absorption cycle, respectively. In the numerical simulation, the pressure drop and temperature of the system outlet are investigated. In the thermodynamic simulation, the performance coefficient of the absorption chiller cycle, the efficiency of the second law of thermodynamics, the cooling load, and the temperature of cooling flow is investigated. The results are validated under the same conditions for optical analysis and numerical solution; Based on this, the values obtained from the simulation is shown a maximum of 7.6% error compared to the results of the reference paper. The maximum heat flux transferred to water flow is equal to 11884 (W/m2) in June, which was obtained using numerical simulation, the maximum value Tout,CPVT=368.8(K). According to the thermodynamic modeling of the system, the minimum flow rate of CPVT was obtained m˙CPVT=0.15(kg/s) and according to the performance coefficient, exergy efficiency, and total cost rate was selected as the optimal flow rate that produces a cooling load equal to Q˙Eva=8.509(kW) the production coefficient and efficiency. Exergy and overall start-up costs are 0.2714, 0.729 and 0.0424 ($/hr), respectively.

Absorption Chiller System Driven by the Solar Hybrid System: Case Study in the Algeria Weather Condition

Abstract In this paper, the performances of a novel hybrid solar system using the Al2O3 nanofluid and pure water as a heat transfer fluid to operate a single-effect lithium bromide absorption chiller are investigated. In which the performance of the proposed system using the nanofluid during winter and summer under mixed and forced convection is evaluated. Thus, the performances of the solar collector are investigated experimentally, and the output performances of the water–LiBr absorption chiller system are conducted numerically using matlab platform. The results show that the obtained Reynolds number of the heat transfer fluid is laminar flow in summer with the maximum values of 1700 and 1600 for nanofluid and water, respectively, and the maximum values of 2200 and 2100 for nanofluid and pure water, respectively, in winter. The proposed hybrid system achieves approximately 54% and 36% of maximum thermal efficiency during the winter and the summer, respectively. The obtained performance shows that the absorption cycle at positive evaporation temperatures is very appreciable using the nanofluid as working fluid during both seasons and quite satisfactory using the water during summer and winter seasons. Overall, the proposed system has potential for further development in the solar cooling system.

Performance investigation and numerical evaluation of a single-effect double-lift absorption chiller

This study deals with innovative integrated absorption refrigeration systems. This cycle could be useful for converting low-temperature energy sources into useful outputs like cooling. The Single Effect Double Lift Absorption Chiller (SE-DL AC) was introduced and energetically evaluated. A detailed modeling based on the first law of thermodynamics is built to investigate the performance of this novel system. This model was initially validated considering a reference SE-DL AC from the Hitachi company with a nominal cooling capacity of 106.1 kW. This system is compared to a conventional single-effect absorption chiller while maintaining the same operating parameters and boundary conditions in both configurations to ensure a fair comparison in terms of the internal and external baseline operating conditions. A parametric study of the driving hot water inlet temperature, the solution mass flow rate, the effectiveness of the solution heat exchanger, and internal and external temperatures on the Coefficient of Performance (COP), Cooling capacity (CC), and Glide Temperature (ΔT) are conducted. The final results demonstrate that the cooling production capability of the SE-DL is increased by an average of about tenfold when compared to the conventional SE AC at a thermal source temperature of 88.7 °C and an inlet hot water mass flow rate of 1 kg/s. The COP results produced under the same operating conditions are quite similar. The cooling generation capability of the SEDL is, on average, 10 times greater than that of the traditional SE AC. This explains that the SEDL-AC is well suited for a wide range of low-temperature heat sources (e.g., solar energy). Furthermore, the SE-DL AC enables efficient use of low-grade heat with a high glide temperature in the driving heat stream of about 10 times (36 °C instead of 3.5 °C). This large temperature difference exemplifies that the SE-DL AC absorption chiller is an alternative for extracting as much heat as possible, thereby improving cold production.

Cooling supply with a new type of evacuated solar collectors: a techno-economic optimization and analysis.

Renewable cooling via absorption chillers being supplied by various green heat technologies such as solar collectors has been widely studied in the literature, but it is still challenging to get positive economic outcomes from such systems due to the large expenses of solar thermal systems. This study offers the use of a new generation of solar collectors, so-called eccentric reflective solar collectors, for driving single-effect absorption chillers and thereby reducing the levelized cost of cooling. This article develops the most optimal design of this system (based on several different scenarios) using multi-objective optimization techniques and employs them for a case study in Brazil to assess its proficiency compared to conventional solar-driven cooling methods. For making the benchmarking analyses fair, the conventional system is also rigorously optimized in terms of design and operation features. The results show that the eccentric solar collector would enhance the cost-effectiveness by 29%. In addition, using optimally sized storage units would be necessary to get acceptable economic performance from the system, no matter which collector type is used. For the case study, at the optimal sizing and operating conditions, the levelized cost of cooling will be 124 USD/MWh and an emission level of 18.97 kgCO2/MWh.

Thermodynamic Optimization of Utilization of LiBr + LiCl/H2O Solution Mixture on a Single-Effect Absorption Chiller Driven by Solar Energy

Abstract The interest in absorption chillers for air conditioning applications has increased recently due to the negligible electricity requirement. Especially in Turkey, where the potential of renewable energy sources such as solar energy is high, it is possible to achieve significant energy savings by utilizing absorption chillers. This study presents comprehensive energy and exergy analyses of a solar-driven single-effect absorption chiller with LiBr + LiCl/H2O (mass ratio 2:1) solution mixture. Thermodynamic optimization is carried out for the first time in this study to determine the optimum generator temperature using different absorber and condenser temperatures to maximize exergy efficiency of the absorption chiller. Also, generator temperature ranges for each absorber and condenser level are determined in this study so that the chiller using solution mixture can operate without crystallization. The coefficient of performance, total exergy destruction rate, and exergy efficiency of solar-driven absorption chiller for solar collector area of 194 m2 under a certain optimized operating condition are 0.402, 113.63 kW, and 1.255%, respectively. Thanks to an alternative solution mixture compared to LiBr/H2O, the effective thermodynamic parameters can be improved and become more advantageous. The comparison results demonstrated that the thermodynamic performance of the system not only increased but also the thermal capacities and collector area decreased.

Thermodynamic analysis of a waste heat recovery libr/H2O single effect absorption chiller system in textile in Vietnam

Model for energy and exergy analysis of absorption refrigeration using waste heat from textile factory has been built. The analysis that uses different models of heat exchangers are the overall heat conductance (UA) model, and the effectiveness model. The result show that the exergy loss in the generator and absorber are the larger than condenser and evaporator. Therefore, it is necessary to focus on improving these two important devices in absorption chiller. For the convenience of system operation, the research analyzed the effects of generator inlet temperature and solution pump mass flow rate on the energetic and exergetic performance of the absorption chiller. The study results indicated that the exergy efficiency of the absorption chiller decrease from 0.2776 to 0.2146 when increasing the solution pump mass flow rate from 1.5 kg/s to 2.5 kg/s and the generator inlet temperature from 80 oC to 98 oC. Meanwhile, energy efficiency will increase slightly initial from 0.769 to 0.779 and then decrease from 0.779 to 0.776 as the generator inlet temperature increases from 80 oC to 98 oC when solution mass flow rate is 1.5 kg/s. And energy efficiency decreases from 0.769 to 0.734 when the solution pump mass flow rate increase from 1.5 kg/s to 2.5 kg/s