Fuel Energy Saving Ratio Research Articles

4E Analysis of a new cogeneration system coupling heat pumps and PEMFC in summer and winter modes

In response to the ongoing optimization of energy systems and the promotion of clean energy, this paper introduces a new high-efficiency cogeneration system based on proton exchange membrane fuel cells (PEMFC). Named the Transcritical Combined Cooling Heating and Power with Subcooling Coupled ORC (CPTSO) system, it undergoes energy, exergy, economic, and environmental (4E) assessments to evaluate its performance in both summer and winter modes. This paper also analyzes the effects of key factors on the new system's performance. The results indicate that the new system performs more effectively overall and achieves faster cost recovery during winter operations. With varying degrees of subcooling (ΔTsubcooling), the system's average energy efficiency, fuel energy saving ratio (FESR), exergy efficiency, and pollutant reduction in winter are 60.97 %, 4.51 %, 17.16 %, and 33.35 % higher, respectively, than in summer. Changes in the main evaporation temperature (Te) result in winter improvements of 74.37 % in energy efficiency, 16.86 % in FESR, 17.6 % in exergy efficiency, and 45.5 % in pollutant reduction compared to summer. Similarly, adjustments to the outlet temperature of the gas cooler (Tg) lead to winter increases of 56.75 % in energy efficiency, 0.49 % in FESR, 17.1 % in exergy efficiency, and 29.3 % in pollutant reduction over summer values.

Investigating a Combined Cooling, Heating and Power System from Energy and Exergy Point of View with RK-215 ICE Engine as a Prime Mover

Using cogeneration systems is a great way to tackle fossil fuel consumption problems. This paper introduces a Combined Cooling Heating Power (CCHP) system to recover the waste heat of an RK215 heavy diesel engine as a prime mover. Therefore the CCHP system consists of Internal Combustion Engine (RK215), a heat storage tank, and an absorption chiller. Also, the system has been studied in four modes: CCHP, CHP, CCP, and single generation. The waste heat ratio has changed due to a y factor, and the effect of this different parameter, such as the start of fuel injection and exhaust gas heat, on the system's efficiency by considering first and second laws of thermodynamic in different operating modes has been investigated. The system's highest energy and exergy efficiency in CCHP mode is equal to 50.46 and 30.8%, respectively. According to the result, as the CCHPs cooling load to the absorption chiller increases, the performance also rises. Also, the system’s carbon dioxide emissions reduction has been studied. The results showed that using different modes for waste heat recovery can reduce carbon dioxide by up to 30% approximately for different modes. Also, the fuel energy saving ratio (FESR) has been investigated, and the results showed that systems in CCHP, CHP, and CCP modes could have FESR approximately equal to 21%.

Multi-criteria evaluation of a novel micro-trigeneration cycle based on α-type Stirling engine, organic Rankine cycle, and adsorption chiller

In the present paper, the multi-criteria evaluation of a novel trigeneration cycle consisting of a Stirling engine, organic Rankine cycle, and an adsorption chiller has been investigated for domestic usage. The proposed cycle is evaluated from thermodynamic, environmental, and economic perspectives. Thermodynamic criteria include fuel energy saving ratio (FESR), exergy efficiency, the thermal efficiency of the Stirling engine, and the overall efficiency of the trigeneration system. Economic criteria consist of net present value (NPV), payback period (PB), present value percentage (PVP). Furthermore, CO2, CO, and NOx reduction ratios are approximated. A sensitivity analysis is conducted for determining the most critical criteria of the cycle and an optimization method is implemented to find the suitable size of the engine. The results reveal that the optimum size of the Stirling engine is 3.3 kW. Utilizing an engine with the aforementioned size will result in the overall efficiency of the system, FESR, and exergy efficiency becoming 76.5%, 42.13%, and 52.27%. Significant pollutants reduction was observed for the optimum prime mover size in which CO2, CO, and NOx were reduced by 28.87%, 64.9%, and 99.25%. Additionally, the economic analysis showed that the NVP and PB are 40,733 $ and 0.88 years.

Quad-generation of combined cooling, heating, power, and hydrogen in a dual-loop chemical looping process: Process simulation and thermodynamic evaluation

A new conceptual layout of transforming distributed co-generation plants into quad-generation plants, which combines the generation of hydrogen, cooling, heating, and power, is derived and analyzed. Two chemical looping techniques are developed in this methane-based quad-generation system, namely, calcium looping CO2 absorption and nickel-based chemical looping combustion (CLC). The objective of the present study is to produce hydrogen as the main product with both high purity and high flux through CLC thermally coupled with sorption-enhanced steam methane reforming (CLC–SESMR) and simultaneously to integrate combined cooling, heating, and power production as by-products through the combined cycle. The implementation of CLC integrated with the SESMR system is designed to fulfill the heat requirements of the reformer and calciner and provide straightforward carbon capture at a relatively low energy penalty. The efforts of four prime parameters, including calcium oxide-to-methane ratio, steam-to-methane ratio, reforming pressure, and reforming temperature, seem to exert significant impact on the properties of the regarded process. Therefore, detailed studies related to these variations have been examined. Meanwhile, the thermodynamic performance of this suggested process, including system efficiencies and the fuel energy saving ratio (FESR), is evaluated under design conditions and reaction parameters. In parallel, the exergy destruction analysis of the whole process is also under discussion. As a result, the total energy and exergy efficiencies as well as FESR are calculated to be 83.91%, 74.05%, and 21.27% in summer and 83.17%, 74.42%, and 21.36% in winter, respectively.

3-E analyses of a natural gas fired multi-generation plant with back pressure steam turbine

Energetic, exergetic and environmental (3-E) analyses of a natural gas fired multigeneration (NGFMG) plant is carried out in this study. The plant is consisting of a topping gas turbine (GT) block with fixed 30 MWe output, bottoming back pressure steam turbine (ST) block with variable electrical output and utility hot water generation block with variable generation capacity. Variation of topping cycle pressure ratio (rp=2-18) and gas turbine inlet temperature (TIT=750-850 °C) as plant operational parameters on the 3-E performance of the plant of are reported here. Base case performance (at rp=4 & TIT=800°C) of the plant shows that the plant is about 33% electrically efficient at base case with fuel energy savings ratio (FESR) value of 40 %. Electrical efficiency of the plant along with FESR increases with either increase in rp or in TIT. However ST output and hot water production rate decreases with increase in the value of plant operational parameters. Exergy analysis of the plant shows that maximum exergy destruction occurs at the combustion chamber. Exergy analysis also signifies that isentropic efficiency of the GT can also be a plant influencing parameter. From emission point of view it is observed that electrical specific CO2 emission is 0.6 kg/kWeh at base case. Specific CO2 emission rate gets lowered with either increase in rp or in TIT.

Energy assessment of PEMFC based MCCHP with absorption chiller for small scale French residential application

In this paper, a novel micro combined cooling, heating, and power (MCCHP) system based on Proton Exchange (PEM) fuel cell and single-effect lithium LiBrH2O absorption machine, was designed and studied. PEMFC exhaust gas is used for heating the building and combustor exhaust gas energy is provided to absorption chiller for house cooling. A developed mathematical model is used to predict the MCCHP unit annual energy performance and saving. The study is focused on the MCCHP unit integrated on a single-family house located into eight different French climatic cities (Trappes, Rennes, Nantes, Strasbourg, Clermont-Ferrand, Bordeaux, Orange, and Marseille). Three operational strategies: following electric load (FEL), following thermal load (FTL) and following thermal and cold loads (FTCL) are investigated. The advantage of each strategy is analysed basing on different operational parameters such as electrical, thermal and total efficiencies of the combined PEMFC-absorption chiller, hydrogen consumption, and self-consumption ratios. The proposed MCCHP has been compared with the conventional separated energy systems using the fuel energy saving ratio as a performance index. The results show that the MCCHP unit saves energy during the whole year respecting the French climatic constraints and the house energy need. The best operational strategy is for MCCHP respecting electricity demand where the yearly average fuel energy saving ratio is about 35%. Furthermore, the analyses show that the maximum Fuel Energy Saving Ratio is about 35%, obtained for a single-family house located at Marseille, while the minimum Fuel Energy Saving Ratio, about 32%, is reached for a house situated at Rennes.

Combined energetic and exergetic assessment of a biomass-based integrated power and refrigeration plant

In this study, an integrated power and refrigeration plant, based on biomass gasification, has been modeled and analyzed. The producer gas generated by gasification of solid biomass undergoes full combustion in a combustor-heat exchanger (CHX) and heats up compressed air for an indirectly heated gas turbine (GT) cycle. The waste heat of the CHX exhaust is further recovered in a recovery boiler to produce steam for the generator of an absorption refrigeration (VAR) unit. Energetic and exergetic assessments have been performed for this integrated plant. Major plant parameters, viz. GT cycle pressure ratio and turbine inlet temperature were varied to find optimized plant configuration. The results show that at a GT cycle pressure ratio 10, the plant yields highest electrical efficiency of 27% when the GT inlet air temperature is 1100 °C. At this point, the plant has the lowest cooling-to–power ratio (CTPR, value being 1.18), although this point also gives best exergetic performance; with a combined exergetic efficiency of 27.6%. The plant also gives lowest exergetic specific biomass consumption of 0.7 kg/kWh and highest fuel energy savings ratio of about 45% at the same point.

Bio-gasification based Externally Fired Combined Cogeneration Plant: Thermo-economic Performance Analysis

Thermo-economic performance analyses of an externally fired biomass gasification based combined cogeneration plant (EF-BGCCP) is reported in the present paper. The plant is capable of producing 700-800 kW electrical power, the gas turbine (GT) providing a fixed output of 500 kWe and the bottoming steam turbine (ST) providing the rest. Utility heat of 100 kW or more is also available from the plant. Saw dust is considered as fuel feed to the plant which undergoes gasification in a downdraft gasifier. A combustor-heat exchanger (CHX) duplex unit is used in the topping GT cycle to heat up the working fluid. Effects of plant design parameters, such as, topping cycle pressure ratio (rp=4-12), gas turbine inlet temperature (TIT=900-1100 oC), cold end temperature difference (CETD=230-280 oC) of the heat exchanger of CHX unit and outlet temperature of the economizer (EOUT=130-180 oC) on the energetic and techno-economic performance is reported in the study. Energetic performance of the EF-BGCCP reveals that, plant efficiency along with fuel energy savings ratio (FESR) is maximized at a particular value of rp, for a given GT TIT. Higher TIT results in higher efficiency and FESR value. However increased CETD value results in decreased overall area (UAHX) of the exchanger. Also, increased value of EOUT results in decrease in plant efficiency and increase in FESR of the plant. Techno-economic analysis of the plant suggest that levelized unit cost of electricity (LUCE) and levelized unit cost of heat (LUCH) change with changes in operating conditions of the plant. LUCE value is minimized at a particular value of pressure ratio, for a fixed GT TIT. Also, higher TIT results in higher LUCE and LUCH delivered to the consumers. Again, higher CETD value of the heat exchanger results in decreased LUCE value as the size of the heat exchanger decreases with increase in CETD. Delivered LUCH value as well as heat to power ratio of the plant is found to be decreased at higher economizer outlet temperature.

ORC cogeneration systems in waste-heat recovery applications

The performance of organic Rankine cycle (ORC) systems operating in combined heat and power (CHP) mode is investigated. The ORC-CHP systems recover heat from selected industrial waste-heat fluid streams with temperatures in the range 150 °C – 330 °C. An electrical power output is provided by the expanding working fluid in the ORC turbine, while a thermal output is provided by the cooling water exiting the ORC condenser and also by a second heat-exchanger that recovers additional thermal energy from the heat-source stream downstream of the evaporator. The electrical and thermal energy outputs emerge as competing objectives, with the latter favoured at higher hot-water outlet temperatures and vice versa. Pentane, hexane and R245fa result in ORC-CHP systems with the highest exergy efficiencies over the range of waste-heat temperatures considered in this work. When maximizing the exergy efficiency, the second heat-exchanger is effective (and advantageous) only in cases with lower heat-source temperatures (< 250 °C) and high heat-delivery/demand temperatures (> 60 °C) giving a fuel energy savings ratio (FESR) of over 40%. When maximizing the FESR, this heat exchanger is essential to the system, satisfying 100% of the heat demand in all cases, achieving FESRs between 46% and 86%.

Performance analysis of a combined cooling, heating and power system with PEM fuel cell as a prime mover

A thermodynamic analysis for a combined cooling, heating and power (CCHP) system based on proton exchange membrane (PEM) fuel cell asa prime mover is done in this paper. The CCHP system consists of a PEM fuel cell, an absorption chiller, a pump, a compressor, and a heat storage tank. This system is investigated from viewpoints of energy, exergy and fuel energy saving ratio (FESR). The results illustrate that, the energy and exergy efficiencies of the CCHP system are 81.55% and 54.5%, respectively. Also, the CCHP system has been compared with conventional energy supply systems and the FESR has been calculated 45%. The exergy destructions of system components have been analyzed and showed that its maximum occurs in PEM fuel cell. Additionally, the effect of fuel cell size on energy and exergy efficiencies is studied, and the results show that by increasing the size of fuel cell, the energy efficiency and COP of the chiller increase but the exergy efficiency decreases. Furthermore, y Factor as an innovative parameter has introduced and shows that when all heat generation by fuel cell is used for cooling demands, the energy efficiency is low, but at lower values of y Factor, energy efficiency increases.

Effect of an alternative operating strategy for gas turbine on a combined cooling heating and power system

The off-design performance of a combined cooling heating and power (CCHP) system is of great importance and is affected by the system configuration and operating strategy. This paper proposes an alternative operating strategy called flue gas reinjecting (FGR) for a CCHP system consisting of a small-scale gas turbine, a double-effect absorption chiller and a hot water exchanger. The FGR operating strategy elevates the compressor inlet temperature by reinjecting a portion of the flue gas into the ambient air, which seems to contradict the well-proven concept of gas turbine inlet air cooling. In contrast, improving inlet air temperature cannot obviously influence the off-design performance of the gas turbine, and more high-temperature flue gas is produced in the gas turbine, which leads to more cooling and heating output in the absorption chiller and hot water exchanger, respectively. To extend the power output range (100–20%), reducing the turbine inlet temperature (TIT) operating strategy is introduced as an auxiliary means. The off-design performance of the CCHP system is investigated under the combined FGR and TIT operating strategy and independent TIT operating strategy. It is found that improved total efficiency and energy saving performance of the CCHP system are presented with the combined operating strategy at partial load. At a load rate of 50% (876kW), the fuel energy saving ratio (FESR) increases from 20.52% to 22.96% as the temperature of the inlet air is increased from 25 to 45°C using the combined operation strategy. The exhaust gas reinjection reduces the excess air resulting in inhibition of the formation of NOX in the combustor. Moreover, using the proposed operating strategy contributes to promoting more effective utilization of low-temperature heat and the direct blending of two fluids reduces heat and pressure losses emanating from the heat exchanger. This study may provide a new operating strategy for small-scale gas turbines to improve the off-design performance of CCHP systems.

Designing an optimal solar collector (orientation, type and size) for a hybrid-CCHP system in different climates

The purpose of this research is to determine the optimum orientation and size of a solar collector to be integrated with a basic-CCHP system. The basic-CCHP includes an internal combustion engine; absorption chiller and possible auxiliary boiler but the hybrid-CCHP is the basic-CCHP plus a solar collector to provide a portion of the thermal energy demand of the consumer. Maximum rectangle method is used to size the prime mover. Size of other components depends on the engine size and building demands. The building which the hybrid-CCHP is supposed to be designed for is a residential building. The optimum conditions for the solar collector are determined in five different climates, and the privileges of using a hybrid-CCHP system instead of the basic-CCHP system are discussed. Furthermore, the impact of full load and partial load operation of engine on the fuel energy saving ratio (FESR) of the basic-CCHP and hybrid-CCHP is discussed. The results showed that for the hybrid-CCHP more FESR is achieved in partial load operation of engine, on the contrary, for the basic-CCHP the FESR is higher when the engine operates in full load.

Hybrid CCHP system combined with compressed air energy storage

This study proposes a novel combined cooling, heating and power (CCHP) system with compressed air energy storage (CAES). By storing or releasing the electricity using CAES, the performance of this proposed system is improved, solving the low efficiency problem of gas turbine due to the off-design working condition. Meanwhile, with the energy storage of heat and cold, the proposed system can work with high efficiency under the condition of meeting the users' energy demand. The system is optimized to minimize the fuel consumption and maximize the exergy efficiency subject to the energy demand. Its thermodynamic performance and the effects of its key parameters are evaluated. As a result, the gas turbine (GT) power of the new system is 30.4% smaller than that of the conventional CCHP, with the fuel energy saving ratio (FESR) as high as 29.4%. This study provides a significantly alternative option for the cogeneration system by combining the CAES into conventional CCHP system. Copyright (c) 2015 John Wiley & Sons, Ltd.

Thermodynamic Performance Assessment of a Bio-gasification Based Small-scale Combined Cogeneration Plant Employing Indirectly Heated Gas Turbine

Thermodynamic model development of biomass gasification based indirectly heated combined cogeneration plant and its simulated performance is reported in this present study. Saw dust is considered as biomass feed, which undergoes gasification in a downdraft gasifier and the producer gas is combusted in a combustor-heat exchanger duplex (CHX) unit. The CHX unit heats up air for a 100 kWe Gas Turbine (GT) and the exhaust heat of CHX unit is utilized in generating bottoming steam turbine work output and utility steam. The performance of the plant is assessed over a wide range pressure ratio (rp) and turbine inlet temperature (TIT) for the GT block, as well as, by varying the steam turbine inlet pressure and temperature along with the outlet gas side temperature of the economizer. For the base case configuration (rp= 4 and TIT=1000 deg C) the plant gives an overall electrical efficiency of about 41% and, at the same time, produces utility steam at a rate of about 180 kg/hr. Its cogeneration performance, expressed in terms of fuel energy saving ratio (FESR), is found to optimize at particular values of topping cycle pressure ratio for different TITs. The study also includes discussion on the sizing of the major plant components. Further, a Second law analysis of the plant concludes that maximum exergy destruction takes place at the gasifier, followed by the CHX unit, together accounting for nearly 40% of the fuel exergy input.

Utilization of waste heat from a HCCI (homogeneous charge compression ignition) engine in a tri-generation system

The waste heat from exhaust gases and cooling water of Homogeneous charge compression ignition engines (HCCI) are utilized to drive an ammonia-water cogeneration cycle (AWCC) and some heating processes, respectively. The AWCC is a combination of the Rankine cycle and an absorption refrigeration cycle. Considering the chemical kinetic calculations, a single zone combustion model is developed to simulate the natural gas fueled HCCI engine. Also, the performance of AWCC is simulated using the Engineering Equation Solver software (EES). Through combining these two codes, a detailed thermodynamic analysis is performed for the proposed tri-generation system and the effects of some main parameters on the performances of both the AWCC and the tri-generation system are investigated in detail. The cycle performance is then optimized for the fuel energy saving ratio (FESR). The enhancement in the FESR could be up to 28.56%. Under optimized condition, the second law efficiency of proposed system is 5.19% higher than that of the HCCI engine while the reduction in CO2 emission is 4.067% as compared with the conventional separate thermodynamic systems. Moreover, the results indicate that the engine, in the tri-generation system and the absorber, in the bottoming cycle has the most contribution in exergy destruction.

Sizing the prime mover of a residential micro-combined cooling heating and power (CCHP) system by multi-criteria sizing method for different climates

In the present study, a multi-criteria sizing function (MCSF) is proposed for designing the optimum size and operating strategy of the prime mover of a residential micro-combined cooling heating and power (CCHP) system. The CCHP prepares the electrical, thermal, cooling, and domestic hot water demands of the same building in five different climates in Iran. The MCSF integrates fuel energy saving ratio (FESR) and exergy efficiency as the thermodynamical parameters, net present value, internal rate of return and payback period for the economical criteria, and CO2, CO and NOx reduction for the environmental evaluations. Analytical hierarchy process is used to weigh each criterion with respect to others. The engine proposed by MCSF results in considerable fuel saving and pollution reduction and a payback period of about 6 years for the 5 climates. In addition, the best strategy according to the engine size is determined for every climate.

Thermodynamic analysis of employing ejector and organic Rankine cycles for GT-MHR waste heat utilization: A comparative study

The waste heat from intercooler and pre-cooler of the gas turbine-modular helium reactor (GT-MHR) is utilized to drive organic Rankine and ejector refrigeration cycles for performance enhancement, in three different configurations. Meanwhile, a new 2D model is developed for the ejector to predict its performance more accurately. The cycles’ performances are analyzed from the viewpoints of both the first and second laws of thermodynamics. The results of optimization revealed that; one of the configurations is more efficient than the other ones from the viewpoint of first law of thermodynamics. In this configuration, at turbine inlet temperature of 850oC the first law efficiency is 15.86% higher than the GT-MHR cycle and the fuel energy saving ratio (FESR) could be up to 20.06%. Another configuration is found to be the most effective (among the three) from the exergy utilization perspective. In this layout, the exergy efficiency is around 2.6% higher than that of the GT-MHR. Through parametric study, the effects of some important parameters such as turbine inlet temperature, pinch point temperature difference as well as the compressor pressure ratio, on the systems’ performances are investigated in detail. The results also showed that the compressor pressure ratio under optimized condition is higher for the configuration with the highest first law efficiency. This point can be accounted as an economic drawback for the configuration. Exergy analyses revealed that the compressor or recuperator (depending on the configuration) has the second highest exergy destruction after the reactor.

Assessment of high temperature organic Rankine cycle engine for polygeneration with MED desalination: A preliminary approach

The objective of this paper is to assess a proposed simultaneous energy and water generation system through a main combination of technologies: organic Rankine cycle (ORC) for heat and power generation, multi-effect distillation (MED) water desalination and a cold generation thermally activated technology (TAT). It is also a primary objective the performance evaluation of the ORC subsystem applied to the use of high temperature renewable energy sources to activate the proposed configuration. This study is divided into three main sections. First of all, the energy feasibility of the proposed configuration is analysed through the Fuel Energy Saving Ratio (FESR) in order to determine the optimal distribution of the heat generated by the prime mover, i.e. the ORC, obtaining that the highest savings correspond to the complete use of heat for domestic hot water (DHW) or heating, which limits the amount of heat used for the activation of MED and TAT subsystems only up to 40%, when the polygeneration system is compared with a high performance stand-alone one. In addition, the ORC subsystem was modelled using the Aspen Plus process simulator, while heat to MED unit was simulated as an input of the model. This part of the paper analyzes a comprehensive list of candidate working fluids for the ORC polygeneration application, and a selection was made of the most interesting according to the preliminary conclusions extracted from the first section of this paper: fluorobenzene and octamethyltrisiloxane could be the most suitable organic fluids for the proposed system. The third main section of this paper deals with the liability of the proposed polygeneration configuration activated by biomass thermal oil boilers through a techno-economic evaluation, revealing that approximate payback periods between 4 and 20 years might be obtained for biomass prices and MED engine specific investment cost in the range of 0–200 €/t and 0–15,000 €/m 3/day, respectively. The main conclusions extracted from the paper results reveal that the amount of heat generated in the ORC condenser used for desalination severely limits the primary energy savings in comparison to conventional systems, as well as the electric efficiency obtained with every single fluid. In consequence, the working fluids that might be used in order to obtain a valid FESR and an assumable economic performance for investors are limited. The importance of the proposed configuration activated by biomass combustion lies in the well-known environmental advantages of this renewable resource, plus the energy advantages from the efficiency point of view (despite the lower efficiency of the subsystems in comparison with internal combustion engines or compression chillers) proving that it is possible to achieve small scale water desalination and electricity, cold and heat generation with energy savings in comparison with conventional systems.

Quasi static optimized management of a multinode CHP plant

Combined Heat and Power (CHP) plants are increasingly used, when feasible, as a mean to reduce fuel consumption and CO 2 emissions. The thermal and electrical production must be adapted to load requirements and must lead to the fulfilment of all the constraints imposed by energy saving regulations. As one of such requirements [a minimum “fuel energy savings ratio” (FESR)] is an integral constraint that can be evaluated only at the end of each year of production, during the design phase of the plant it is of the utmost importance to have a fast algorithm able to simulate and optimize the operating conditions of all the candidate CHPs configurations, as the non-compliance with FESR regulations may lead to loose significant tax discounts, and therefore make the investment less profitable. The paper describes a suitable algorithm and its application to the optimization of a real CHP site located in Italy; besides, this work has led, as a further step toward the optimized control of larger systems, to the introduction of an additional degree of freedom (“on–off” state of some machines) extending in principle the optimization procedure to multinode CHP plants.

Thermodynamic analysis of a tri-generation system based on micro-gas turbine with a steam ejector refrigeration system

In the present work, performance of new configuration of Micro-gas turbine cogeneration and tri-generation systems, with a steam ejector refrigeration system and Heat recovery Steam Generator (HRSG) are studied. A micro-gas turbine cycle produces 200 KW power and exhaust gases of this micro-gas turbine are recovered in an HRSG. The main part of saturated steam in HRSG is used through a steam ejector refrigeration system to produce cooling in summer. In winter, this part of saturated steam is used to produce heating. In the first part of this paper, performance evaluation of this system with respect to Energy Utilization Factor (EUF), Fuel Energy Saving Ratio (FESR), thermal efficiency, pinch point temperature difference, net power to evaporator cooling load and power to heat ratio is carried out. It has been shown that by using the present cogeneration system, one can save fuel consumption from about 23% in summer up to 33% in winter in comparison with separate generation of heating, cooling and electricity. In the second part of this paper, exergy analysis of the system has been done. It has been shown that combustion chamber; HRSG and heat exchanger are recognized as the largest sources of exergy losses respectively.