Double-effect Absorption Chiller Research Articles

Techno-economic and thermodynamic analyses of a novel CCHP system driven by a solid oxide fuel cell integrated with a biomass gasification unit and a double-effect LiBr-water absorption chiller or heat cycle and carbon capture

Techno-economic and thermodynamic analyses of a novel CCHP system driven by a solid oxide fuel cell integrated with a biomass gasification unit and a double-effect LiBr-water absorption chiller or heat cycle and carbon capture

Energy, exergy, thermoeconomic analysis of a novel multi-generation system based on geothermal, kalina, double effect absorption chiller, and LNG regasification

The current work proposes a novel CCHP system based on geothermal energy, which can generate hot water, chilled water, and power. Kalina is considered for power generation, double-effect absorption chiller cycle for cooling production, and LNG regasification cycle for thermal integration of absorption chiller and electric power generation. The hot water is generated using the heat recovery exchanger. Energy, exergy, economic, and environmental assessments are made on the proposed system to see how it can improve energy and exergy efficiency compared to the single state. Also, an environmental assessment is carried out to analyze the reduction of CO2 emission rate compared to other studies that used biomass and fossil energy sources. The findings were confirmed considering the outcomes of the previous works, and the proposed system showed remarkable performance in terms of exergy and energy efficiency, which were 85.22 % and 52.79 %, respectively. Also, the highest irreversibility exists in the LNG Regasification sector, with a ratio of 81 %. The economic estimation determined that the two parameters, total cost rate and cost per exergy, are 186.74 $/h and 8.3 $/GJ, respectively. Therefore, the innovation of the work lies in the heart of heating, cooling, and power products compared to the previous works.

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

Eco-friendly process simulation and comprehensive multi-variable investigation of a modified geothermal-driven system toward a novel combined cooling heating, and power generation-desalination application

The widespread use of fossil fuels and the environmental pollution resulting from their unregulated consumption contribute to the phenomenon of global warming. Therefore, it is imperative to develop multigenerational systems using clean and renewable energy sources. In this paper, a novel eco-friendly and modified multigeneration process is proposed that integrates the subsystems of a modified/improved Kalina cycle, an organic Rankine cycle, a sea water desalination, and a double-effect absorption chiller. The objective of this process is to produce cooling, heating, power, and fresh water. Aspen HYSYS software is used to simulate the entire system, and the 4E aspect (energy, exergy, economics, and environment) are examined. The entire system can produce cooling, heating, and power of 12095.4 kW, 43180 kW, and 13035.81 kW, respectively. The results demonstrate that the overall energy, exergy, heating generation, and electrical efficiencies of this system are 41.83%, 41.23%, 25.04%, and 7.56%, respectively. Besides, the economic study exhibits the sum unit cost of the outputs and the levelized cost of energy for the proposed process as 54.96 $;GJ−1and 0.139 $;kWh−1, respectively. Also, total capital investment and total annual cost are computed to be 190669148 $ and 70169705 $/year, respectively.

Thermodynamic evaluation of a state-of-art poly-generation system fueled by natural gas and biomass for cooling, power, and hot water generation

The principal objective of this study was to conduct a thorough examination of the thermodynamic aspects of an innovative combined poly-generation facility, encompassing cooling load, hot water, and power generation cycles, powered by a combination of natural gas and biomass. A distinctive feature was the incorporation of syngas into natural gas to enhance overall plant performance. The plant design comprised three key subsystems: a gasification and combustion chamber, a double-effect absorption chiller, and a supercritical carbon dioxide cycle. Energy and exergy analyses were employed to systematically evaluate the thermodynamic behavior of the plant. The outcomes revealed that the exergy and energy efficiencies, along with the net power output, were determined to be approximately 35 %, 78 %, and 7422 kW, respectively. Additionally, the produced hot water and the coefficient of performance (COP) of the absorption chiller were estimated at around 14.71 kg/s and 1.209. Notably, the gasifier and combustion chamber emerged as the least efficient components of the system, primarily due to their elevated rates of exergy destruction. Furthermore, comprehensive parametric investigations were conducted to elucidate the influence of key variables on plant performance. The analysis indicated that variations in gasification temperature positively impacted the thermodynamic performance of the plant. Moreover, an increase in combustion pressure led to a notable enhancement in the net power output of the facility.

High-efficiency utilization of biomass and seawater resources based on a distributed system with SOFC-assisted CO2 capture: Feasibility analysis and optimization

This paper develops a distributed system with SOFC-assisted carbon capture (SACC) by integrating the Rankine cycle, double-effect absorption chiller and multi-effect distillation unit to produce electricity, cooling and freshwater. To study the feasibility of the developed system, thermodynamic, economic and carbon footprint analyses and optimization are conducted on six different cases for the system. The results reveal that regardless of the biomass sources used as fuel, the developed SACC system requires 5%-9% less power consumption for CO2 capture compared to traditional methods. Moreover, the system fueled by switch grass exhibits superior efficiencies, and the system thermal efficiency (ηth) with SACC achieves 56.35% with corresponding levelized cost of products (cp) and total global warming potential (GWPt) of 54.94 $/GJ and −0.129 kg/kWh. Exergy analysis demonstrates that the prime mover unit (PMU) deserves the greatest irreversibility for all cases with a relative exergy destruction rate (y*k) of over 65% of the whole system. Within the PMU, the gasifier and SOFC are responsible for the highest irreversibility, and the y*k of the gasifier is over 50% and the SOFC’s is close to 9%. The parameter study indicates that an increase in the gasification temperature is unfavorable to ηth, however, it is conducive to the improvement of net power output (Wnet) when the temperature exceeds a certain value (e.g., 914.3℃ and 885.7℃ for Case-5 and Case-6). An appropriate increase in current density improves ηth and Wnet, and reduces cp, albeit slightly detrimental to environment. The optimization results demonstrate that Case-2 and Case-6 have superior thermodynamics and economics but are detrimental to the environment. In contrast, Case-1 and Case-5 are the most environmentally friendly, but their economics and thermodynamics are degraded to some extent.

Multi-aspect prediction of the sensitivity of thermodynamic/thermoeconomic performance metrics of an innovative solar-driven trigeneration system utilizing thermal energy storage

Clean energy development for multiple productions interests many countries and companies. Hence, this paper presents an innovative solar-driven trigeneration arrangement equipped with a thermal energy storage unit (TESU); the whole system comprises parabolic dish collectors, a modified Rankine cycle, and a double-effect absorption chiller. The system is designed to enhance the integrity performance compared to previous designs. Heat loss recovery is performed using an internal heat exchanger to improve the Rankine cycle's performance. The operating framework of the arrangement contains three steady modes: solar mode associated with the state without applying TESU, storage mode corresponding to the state without solar energy using TESU, and solar-storage mode capable of storing energy in addition to launching the combined cycles. The prediction of the sensitivity of the net output power, heating capacity, input energy, power to heating and cooling ratios, and energy and exergy efficiencies is conducted in solar mode. Furthermore, the thermoeconomic analysis is carried out in solar mode to determine the equipment's financial aspect. Referring to the results, the overall energy efficiencies of the modes introduced before are equal to 97.23%, 81.98%, and 40.23%, and the corresponding exergy efficiencies are 15.53%, 14.47%, and 8.58%. Also, the exergoeconomic factor of the solar subsystem is 70.77%.

Technical and Economic Feasibility Analysis of Solar Inlet Air Cooling Systems for Combined Cycle Power Plants

In this study, the thermodynamic behavior of a combined cycle power plant with integrated solar-driven inlet air cooling was simulated for Tehran, Phoenix, and Houston during warm-hot seasons. A considerable reduction in the output power was realized during hot ambient conditions due to the lower density of the air and lower mass flow rate to the turbines. The output power decreases from 306.6 to 260.8 MW as ambient temperature increases from 15 to 45 °C. This research focuses on utilizing solar cooling systems to achieve low inlet air temperature to generate high-electricity yields. Four different types of solar collectors and two different absorption chiller units were selected and simulated for each city to achieve the required goal. It was identified that integrating a solar inlet air cooling (SIAC) system can avert the reduction in output power with no impact on efficiency. The humid climatic condition in Houston and the low electricity cost in Tehran posed some challenges in designing a feasible SIAC system. However, by optimizing the solar collectors and cooling capacities, an optimal solution for utilizing inlet air cooling in humid climates is presented. In terms of overall impact, the evacuated flat plate collector (EFPC) coupled with a double-effect absorption chiller displayed the best economic performance among the four variants under study. In Phoenix, this combination can maintain output power during hot days with a DPR of 2.96 years.

A thermodynamic, exergoeconomic, and exergoenvironmental investigation and optimization on a novel geothermal trigeneration system to sustain a sport arena

In recent years, there has been a growing emphasis on sustainable energy provision for sport facilities, aiming to reduce carbon emissions, promote energy efficiency, and create a more sustainable sporting environment. The present investigation concurs with introducing a novel trigeneration system intended to generate power and provide heating and cooling load for sports facilities. The present system is offered to sustain the general energy requirement of an intended sport compound independently throughout the year. The single-flash Geothermal (SFG) system is included as a measure for attaining the required energy to initialize the system. After producing power and providing heat load, the remaining exergy associated with the SFG system is harvested and utilized to drive the double-effect absorption chiller (DEAC), Kalina cycle (KC), and the Organic Rankine cycle (ORC). A further study based on the first law of thermodynamics revealed that the SFG system, KC, and ORC allot thermal efficiency by 5.724 %, 9.31 %, and10.26 %, respectively. Furthermore, the second-law investigation determined that the SFG system, KC, and ORC allocate exergetic efficiency by 18.08 %, 34.89 %, and 48.64 %, respectively. From an extended numerical perspective, the SFG system was deemed to result in a total output value of 66.55 kW worth of power and 615.8 kW worth of heating load. The DEAC performed with an 88.8 kW worth of cooling load provision and 1.199 as the coefficient of performance (COP). The KC and the ORC delivered 26.14 kW and 14.61 kW as in total outlet power, respectively. Integrally, the generalized system was found capable of producing 107.3 kW worth of net power output. The sum unit cost of the products (SUCP) was evaluated for the overall system, which equals 45.55$/GJ. A multi-objective Genetic algorithm optimization is carried out, aiming to achieve the optimal points and conditions of the system using the Pareto frontier method, where point C was chosen according to the TOPSIS criteria, deriving 46.0$/GJ and 40.09 % associated with SUCP and exergetic efficiency, respectively. Eventually, the exergoenvironmental parameters are derived and analyzed to study the environmental impacts.

Exergoeconomic evaluation of a novel multigeneration process using solar driven Kalina cycle integrated with gas turbine cycle, double-effect absorption chiller, and liquefied natural gas cold energy recovery

This study is motivated to propose, evaluate, and optimize a solar-based multigeneration system relying on consecutive heat integration. Here, a heliostat field is configured to collect solar power and supply high-temperature air toward a nitrogen-based Brayton cycle. Afterward, the output hot air is subjected to a Kalina cycle suitable for medium-temperature heat resumption. A double-effect absorption refrigeration cycle boosted by a Liquid-based natural gas cold energy recovery unit for power generation and natural gas regasification are the other subsystems. The principal purpose is to protect the energy level of the fluid evacuating the solar field and to minimize the irreversibility of the scheme since solar-based systems lead to major irreversibility. The designed process is apprised from a 3E perspective, including exergy, energy, and exergoeconomic analyses. In addition, a comprehensive sensitivity study is done based on the influence of effective factors on the exergy and energy efficiencies and unit cost of products. Eventually, a multi-objective optimization is performed to set the most suitable condition of decision parameters and reach the optimal unit cost of products and exergy performance (objective functions). To do optimization, a genetic algorithm is applied, and two decision-making approaches, i.e., LINMAP and TOPSIS, are regarded. The optimal objectives are gauged to be 24.76% and 15.90 $/GJ by TOPSIS and 24.47% and 15.73 $/GJ by LINMAP, respectively.

Dynamic Investigation of a Coupled Parabolic Trough Collector–Phase Change Material Tank for Solar Cooling Process in Arid Climates

The use of solar energy for cooling processes is advantageous for reducing the energy consumption of conventional air-conditioning systems and protecting the environment. In the present work, a solar-powered cooling system with parabolic trough collectors (PTC) and a phase change material (PCM) tank is numerically investigated in the arid climates of Saudi Arabia. The system contains a 160-kW double-effect absorption chiller powered by solar-heated pressurized water as a heat transfer fluid (HTF) and a shell and tube PCM as a thermal battery. The novelty of this paper is to investigate the feasibility and the potential of using a PTC solar field coupled to a PCM tank for cooling purposes in arid climates. The numerical method is adopted in this work, and a dynamic model is developed based on the lumped approach; it is validated using data from the literature. The functioning of the coupled system is investigated in both sunshine hours (charging period) and off-sunshine hours (discharging period). The PTC area in this work varies from 200 m2 to 260 m2 and the cooling capacity of the chiller ranges from 120 kW to 200 kW. Obtained results showed that the 160-kW chiller is fully driven by the 240 m2-solar PTC during the charging period and about 23% of solar thermal energy is stored in the PCM tank. It was demonstrated that increasing the PTC area from 220 m2 to 260 m2 leads to a reduction in the PCM charging time by up to 45%. In addition, it was found that an increase in the cooling loads from 120 kW to 200 kW induces a decrease in the stored thermal energy in the PCM tank from 450 kWh to 45 kWh. During the discharging period, the PCM tank can continue the cooling process with a stable delivered cooling power of 160 kW and an HTF temperature between 118 °C and 150 °C. The PCM tank used in the studied absorption chiller leads to a reduction of up to 30% in cooling energy consumption during off-sunshine hours.

Thermodynamic analysis of a novel hybrid fuel cell-combined cooling, heating-and power (CCHP) system-integrated solar-driven biomass gasification for achieving sustainable and efficient poly-generation

ABSTRACT In this work, a novel biomass and solar energy hybrid fuel cell-combined cooling, heating, and power (CCHP) system is proposed, including solar-driven biomass gasification, solid oxide fuel cell, homogeneous charge compression ignition engine, double-effect absorption chiller, and waste heat recovery unit. The aim of this work is to explore the feasibility of the proposed system from thermodynamic and environmental perspectives. Based on the thermodynamic modeling, the comprehensive performance of the proposed system is evaluated by multiple methods, including energy, exergy, exergoeconomic, and environmental analyses. Furthermore, it was compared with a reference system without solar energy to illustrate the advantages of the proposed system. It is found that the total energy and exergy efficiency of the hybrid system are 57.5% and 36.6% under design condition, respectively. The energy and exergy efficiency of the proposed system are 2.7% and 2.1% higher than those of the reference system, respectively. The introduction of solar energy significantly increases the utilization rate and the generating capacity of the unit biomass by 63.8% and 36.3%, respectively, compared to the reference system. In addition, the carbon emission of the proposed system is about 0.071 to 0.075 t/GJ and 46.3% lower than that of the reference system.

Proposal of a thermocline molten salt storage tank for district heating and cooling

Thermal Energy storage is one of the critical components in district heating and cooling (DHC) facilities when based on intermittent energy sources (as solar). Currently, DHC energy storage is based on water tanks. Nevertheless, water storage cannot be used with medium temperature processes as double effect absorption chillers or other services requiring temperatures well above 100 °C. Current thermal storage at higher temperature may be based on a variety of technologies. Among then, molten nitrate salts are widely used for heat storage in concentrated solar plants (CSP), limited by the melting temperature of available commercial solar salts and their solidification risk. Such commercially available salts are not applicable to district heating and cooling as they are solid in the expected operational temperature range. Other storage media may be solid materials, either by the use of packed-bed materials, concrete or phase change materials. In this paper, an innovative molten salt mixture with a melting temperature below 150 °C is used. The availability of a storage medium in a temperature range from 150 up to 250 °C might increase the solar share in DHC installations, integrating concentrated solar technologies. Such storage allows to apply solar technologies to supply heat to services for DHC that now can be only provided by boilers. In this communication, a molten salt storage tank operating in thermocline mode will be proposed in the framework of the WEDISTRICT project [1]. The project seeks to deliver the highest possible share of renewable sources for the energy needs of a district demand, maximizing performance by the application of advanced absorption chillers, that requires temperature feeds well above 100 °C.

Dynamic analysis of single–double-effect absorption chiller with variable thermal conductance during partial-load operation

• This study presents the dynamic analysis with variable thermal conductance. • Resistance ratio method is introduced to capture the variable thermal conductance. • The field test and simulation results have a good agreement. • An effective operation strategy that can improve the system performance is proposed. • The proposed operational approach increases the COP by as much as 32%. A numerical model for the dynamic analysis and control of a solar-assisted single–double-effect absorption chiller is presented. The mathematical model relies on energy and mass balances, which consider the heat and mass storage in each component. The resistance ratio method is introduced to capture the variation in the thermal conductance representing system disturbances and load variations according to the internal and external flow rates. The model was validated with reference to the outlet temperatures of hot, cooling, and chilled water from field test data for a given gas flow rate and corresponding inlet temperatures. The agreement between the field test and simulation results demonstrates the reliability of the model. Deviations between simulated and experimental temperatures mostly stays below 0.5 °C. The model was used to establish an effective operating strategy capable of minimizing the primary energy consumption without affecting the stability of the cooling output capacity and to verify the corresponding beneficial effect. The proposed operational approach increases the coefficient of performance by as much as 32 % compared with the previously implemented operation strategy, reaching up to a maximum value of 10.7 at 60 % cooling capacity.

A systematic thermodynamic performance assessment of a solar-driven double-effect absorption chiller integrated with absorption energy storage

Sensible heat storage in the form of hot water is usually applied to solar-driven cooling systems to increase their cooling coverage. The main limitation of sensible heat storage is high thermal losses. A double-effect absorption chiller is operating in a typical generating temperature range of 150–180 °C and has a better performance compared to the single-effect type. Due to the high operating temperature range of the chiller, this study suggests the integration of an absorption energy storage (AES) on a double-effect chiller based on H2O-LiBr solution and driven by parabolic trough solar collectors. This is because in AES, heat is stored in the form of chemical potential and the issue of heat loss is minimal. The paper presents a model of the integrated system and its performance evaluation considering the undesirable solution crystallization phenomena under various operating conditions. The results show that, under certain operating conditions, there is a high risk of solution crystallization in the chiller during the charging operation when the solution distribution ratio is below 50 %. Moreover, the results indicate that when a solution with an initial lithium mass fraction of around 55 % in the strong tank is considered, there is a tendency for crystal formation in the solution storage tank and at some locations within the chiller. There is a potential risk of solution crystallization in the solution storage tank and at some locations within the chiller cycle when a solution with an initial LiBr mass fraction of 55 % and an initial mass of 64,000 kg is considered. Considering the weather data of Dhahran, the best-operating conditions are obtained at an initial solution mass of 64,000 kg in the storage tank, initial solution LiBr mass fraction of 0.5, and solution distribution ratio of 55 %. At these and other conditions detailed in the paper, the highest energy storage density is about 136.8 kWh/m3, with an average cooling effect of 1700 kW, overall solar system COP, and exergy efficiency of 0.985 and 0.067 respectively, during a fourteen-hour operation. The findings in this study provide useful information to researchers on sizing the storage unit considering the appropriate initial conditions to avoid solution crystallization.

Thermodynamic and Economic Performance Assessment of Double-Effect Absorption Chiller Systems with Series and Parallel Connections

Absorption cooling technologies converting excess heat and renewable heat resources to cooling energy have shown progress in recent years. In this study, two 400 kW LiBr solution absorption chiller types with series and parallel connected are analyzed over a range of parameter values to better understand their applicability for different uses. Thermodynamic models for the components were constructed and validated. The performance of the chillers related to heat transfer, energy, exergy, and economy performance was comprehensively analyzed. The operating performance was investigated by considering the external variables, including inlet cooling water, chilled water, and inlet steam temperatures and the solution allocation ratio. The results indicate that the parallel connected chiller reaches higher energy and exergy performance than the series-connected chiller, but the heat transfer and economic performance was lower. The coefficient of performance and the exergy efficiency of the parallel chiller were for the reference system 1.30 and 24.42%, respectively. Except for the exergy efficiency, the inlet steam and inlet chilled water temperature had positive impact on the heat transfer, energy, and economic performance, while the inlet cooling water temperature trends the opposite. The sensitivity analysis on solution allocation ratio showed that a higher ratio decreases the heat transfer and economic performance, but considering the energy and exergy performance, a suitable allocation ratio would be 0.54.

Feasibility and environmental assessments of a biomass gasification-based cycle next to optimization of its performance using artificial intelligence machine learning methods

Though bioenergy still emits some emissions, they are a lot lower than fossil fuels. Besides, the increase in water and power consumption keeps pace with the earth's growing population. Therefore, many studies have been conducted on multi-purpose cycles. Utilizing the biomass gasification process to produce the fuel needed for a gas turbine is a novel technology. The additional heat from the outlet gases is used to produce higher power in the Rankin cycle and cooling in the double-effect absorption chiller. The net power produced in this cycle will be used to empower the desalination system using reverse osmosis (RO) to increase the inlet pressure of the salty water so that it passes the water treatment membranes. Since the outlet water pressure is high, a water turbine is used to generate electricity. The genetic algorithm, along with machine learning methods, is used to achieve the optimal performance conditions and reduce the calculational time; because the time and calculational costs for modeling every cycle are high, and the optimization process will be prolonged. The results revealed that the proposed system is capable of producing a power of nearly 400 kW, with an exergy efficiency of 41 % and CO2 emission rate of 0.59 ton/MWh. Besides, the desalination rate and cooling capacities are 1.7 kg/s and 310 kW, respectively.

Machine learning-based metaheuristic optimization of an integrated biomass gasification cycle for fuel and cooling production

Nowadays, Combined cycles have attracted much attention for improving the efficiency of the thermodynamic cycles. In these systems, the main idea is to optimally use the waste energy from the power cycle, to run the cooling, heating, and storage cycles of hydrogen and biofuel-based ammonia. In this research study, an innovative integrated biomass gasification energy system for ammonia production is used alongside hydrogen storage. In addition, gasification is used to produce the required fuel for power generation. The gasification intake air is preheated with solar panels and then enters the gasification unit. The cooling water passing through this stage is heated up to the temperature of the electrolysis and then gets decomposed. The produced hydrogen fuel is used and stored for ammonia fuel production. The power cycle consists of a gas turbine system alongside a Rankin cycle, and then the exhaust gas is guided towards the cooling cycle of a double-effect absorption chiller. The results show that this system can generate power up to 7 megawatts with an exergy efficiency of 66%. Furthermore, ammonia production and hydrogen storage rates are 0.38 and 0.101 kg per second, respectively. Genetic algorithm optimization along with machine learning methods is used to achieve the optimization points of this cycle. At the optimized point, this cycle can produce 0.5347 kg per second of ammonia with an exergy efficiency of nearly 64%.

Optimizing single-stage double-effect LiBr-H2O absorption chiller in micro-trigeneration system using an atom search optimization algorithm

Wastes produced from several processes are focused on by many scientific researchers in order to reuse them, achieve energy savings, and reduce cost and environmental pollution. Recently, many organizations have utilized a micro-trigeneration system as a primary energy source, as it produces cooling, heat, and power in a combined effect. Various scholars designed numerous trigeneration systems in recent years. However, it is challenging to attain energy-efficient operation. Therefore, this current research focuses on developing an optimal micro combined cooling, heating, and power generation (MCCHP) to improve energy efficiency and reduce cost. The major components of the trigeneration system are the diesel engine, heat exchanger, boiler, absorption chiller, and chilled water storage system. In order to improve the cooling output of the proposed system, a single-stage, double-effect absorption chiller (LiBr-H2O absorption chiller) is utilized with the atom search optimization (ASO) algorithm. The variables of the condenser in the absorption chiller are given as input for optimization. The results show that the proposed system has a cooling capacity of 16 kW. Compared with the existing algorithms, it is efficient with 98% temperature minimization and cost-effectiveness. This micro-trigeneration device can be used in hospitals and the food production industry and is cost-effective.

Proposing a new method for waste heat recovery from the internal combustion engine for the double-effect direct-fired absorption chiller

The use of waste heat in absorption refrigeration cycles is always one of the effective methods of heat recovery that leads to efficiency improvement, energy consumption and pollutants emissions reduction. Accordingly, in this study, a new method is proposed to utilize the waste heat from the exhaust gas of the internal combustion engine (ICE) for a double-effect direct-fired absorption chiller cycle, numerically and experimentally. According to high distance of ICE with absorption chiller, should be used water as working fluid. In this paper, the main goal is to design a new generator for the absorption chiller which provides the required heat from high temperature water instead of combustion heat. In this regard, in the first step, a numerical model is developed to introduce the optimal generator inlet temperature based on energy, exergy, ecoexergy and environmental analysis. Then, the results obtained from modeling is compared with the experimental results. In addition, the inlet temperature of superheated water to the chiller is optimized with multi objective optimization (TOPSIS) method at different concentration of LiBr. Results show that a fuel consumption reduction of 467.7 m3/hr is obtained using the waste heat of the ICE which causes significant decrease 3461.832 kg/year and 1919743.2 kg/year in NOX and CO2 emissions, respectively. It is also concluded that the optimal inlet water temperature of chiller becomes equal to 138 ℃, 137 ℃ and 136 ℃ for of lithium bromide concentration of 0.62, 0.6 and 0.58, respectively.