Exergy Coefficient Of Performance Research Articles

Optimizing working fluids for advancing industrial heating performance of compression-absorption cascade heat pump

Independent cascade hybrid heat pump (ICHHP) can bridge the large temperature gap between low-grade air sources and high-temperature industrial demands. However, the working fluids used in previous studies are just considered sufficient as long as they perform their functional role. They may not always be the most suitable choices in different situations, and the maximum efficiency of ICHHP has not been achieved. Ionic liquids (ILs) as alternative absorbents have shown the potential to enhance ICHHP performance with their unique ability to tailor thermal properties by freely combining anions and cations. However, the scarcity of IL thermodynamic properties data, underscored by limited vapor-liquid equilibrium experiments, has impeded the full exploitation of this inherent advantage. Obviously, the lack of dedicated research on screening optimal working fluids limits ICHHP performance. To address the identified limitations, the optimal fluid is recommended in this paper by comprehensively evaluating the performance among 100 fluid combinations under different working conditions. The results indicate that R161 is the best choice for the compression subloop. For the absorption subloop, the performance improvement is more sensitive to the anionic species, with the order of influence generally being [OAC]− > [Br]− > [OMS]− > [TFA]−. Specifically, H2O/[EMIM][OAC]—R161 stands out, with maximum improvements in coefficient of performance (COP) and exergy coefficient of performance of 9.4% and 5.6%, respectively, compared to other candidates. Furthermore, it doubles the COP relative to the reference fluid H2O/LiBr—R134a. Consequently, H2O/[EMIM][OAC]—R161 is the superior working fluid, significantly advancing industrial heating efficiency for ICHHP in large temperature lift conditions.

Simultaneous increase of parameters of an experimental absorption system: Neural network inverse optimization methodology with multi-inputs

The Absorption Heat Transformer (AHT) has become an alternative proposal to weaken the trend of thermal pollution because it contributes to the recovery of residual heat and the use of solar thermal energy for its activation. Recently, compact designs have been developed that share two heat exchangers in one shell to reduce heat losses and save maintenance costs. The evaluation of the performance of AHTs depends on multiple parameters, which have been optimized using models based on ideal conditions. Multivariable optimization with artificial intelligence has considered experimental data to obtain feasible conditions related to the operation of the AHT. However, these models have focused only on determining one parameter at a time, reflecting a limitation. This study aims to develop a new optimization strategy to simultaneously maximize two relevant parameters associated with the efficiency of a compact experimental AHT. The optimization methodology is applied to increment the values of the heat generated in the absorber (QAB) and the Exergy Coefficient of Performance (ECOP) using the same objective function. This objective function is resolved when reaching the desired output parameters by determining multiple optimal conditions of the AHT. Initially, the modeling of the experimental data was carried out using an artificial neural network (ANN) for the diagnosis and prediction of the QAB and the ECOP. The model was validated by comparing the experimental values of QAB and ECOP against predicted values through a linear regression model, with a satisfactory result of R2>0.98. Subsequently, the multivariable inverse artificial neural network methodology for multiple output parameters (ANNim-m) was used and coupled with the Particle Swarm Optimization algorithm (ANNim-m-PSO) to generate the new multivariate optimization strategy and improve QAB and ECOP parameters simultaneously. Finally, 4 random tests with different initial operating conditions were optimized. Based on the optimization of the 4 tests, the QAB heat load was increased by 87.7 %, 54.2 %, 30.79 %, and 22.66 % from initial experimental conditions of 2.7, 9.0, 14.23 and 23.29 kW, respectively. In the case of ECOP, elevations of 28.5 %, 23.4 %, 15.4 %, and 16.18 % were obtained for initial values of 0.3801, 0.455, 0.5180, and 0.5729, respectively. It is determined that the parameters QAB and ECOP have a high sensitivity when the inlet temperature of the absorber of the external circuit (TAB) decreases. The results reveal that it is feasible to use the ANNim-m-PSO model, because the optimization was able to significantly maximize both QAB and ECOP parameters of the 40 kW experimental AHT.

Thermodynamic appraisal of utilizing compressor in double effect absorption heat transformer

In the current appraisal, three various designs of employing compressors in double-effect heat transformers are presented and evaluated from exergy and energy standpoints and collated with the simple configuration of mentioned designs. Water-LiBr is utilized as an operating fluid in noticed systems. As a function of the unit temperatures, the gross temperature lift, pressure ratio (R),and the efficiency of the economizer, a numerical model is also introducedto prognosticatethe irreversibility, exergy coefficient of performance (ECOP),coefficient of performance (COP), and the exergy destruction in each and every one of the key components (EF). The findings show that the generator has the highest exergy destruction, accounting for around 46.06% of the total exergy destruction. Additionally, a decrease in the temperature of the absorber increases the ECOP and COP. The outcomes indicate that systems utilizing water-LiBr as operating fluid have a higher outlet temperature of the absorber as well as higher condenser temperature and lower coefficient of performance (COP). the results showed that, Regarding the simple DEAHT curve, the COP slowly diminishes at low absorber-evaporator temperatures and rapidly at absorber temperatures more than 144.5 °C. Also, Utilizing the compressor in the basic design of the DEAHT unit results in improving the absorber temperature.

Exergy analysis of an experimental ammonia/water absorption cooling system

This study proposes a second-law analysis of an experimental ammonia-water absorption cooling system, assessed under different operating conditions. The study also includes an analysis of what is considered the most significant research of exergy analyses on experimental absorption systems. The approach proposed in this study takes into consideration two types of exergy: chemical and physical, to determine the irreversibilities in the absorption system. Special attention has been paid to the contributions of the chemical exergy in the absorber, generator, and rectifier. Also, an evaluation of the exergy destruction as a part of the total exergy supplied to the system and its variation within the considered conditions range is presented. The effect of the variation of the dead-state temperature on the system’s irreversibility is also evaluated. Moreover, the components' irreversibilities contribution and their possible causes are discussed and presented for the main system components. Finally, the second-law efficiency or exergy coefficient of performance (ECOP) is reported as a function of the heating and cooling water temperatures. The highest ECOP achieved by the absorption system was 14.4%.

A novel advanced absorption heat pump (Type III) for cooling and heating using low-grade waste heat

The heat of low-grade can be used to get cooling and heating simultaneously by using the coupling of two absorption heat pumps (conventional/not conventional). This novel advanced absorption heat pump requires three pressure levels to increase and reduce the temperature of useful heat, where desorption/condensation processes are shared at medium pressure, and the two evaporation/absorption processes are developed at low and high pressure respectively. The aim of this proposal is to study this kind of advanced absorption heat pump (Type III) by using the first and second laws of thermodynamics, to determine the energy and exergy coefficient of performances for the whole system by taking into account three scenarios of heat flux rates for both evaporators. The irreversibility and exergy performances for the main components are determined to improve the exergy coefficient of performance. The understanding of reversible Carnot cycles, and the general relationship of energy coefficient of performances at low, medium, and high temperatures for this proposal are analyzed. This advanced absorption heat pump reaches cooling temperatures from 14 to 20 °C and heating temperatures between 80 and 106 °C using water/lithium bromide as a working solution. The energy coefficient of performance of 0.68 is obtained when the higher thermal load of the cooling evaporator than the heating evaporator.

Experimental Investigation on an Absorption Heat Transformer for Production of Hot Water or Steam Generation

The absorption heat transformer is widely used to utilize low-temperature waste heat in the field of distributed energy, industrial processing, and long-distance indoor heating, because it can upgrade energy level and deliver heat to heated medium. In this work, an experimental system of a vertical single-stage LiBr/H2O absorption heat transformer was established to study its performance in the case of producing high-temperature water or low-pressure steam generation under different heating water flow rates. The useful output heat, coefficient of performance, exergy coefficient of performance, and gross temperature lift of the single-stage heat transformer have all been tested. The results show that the absorber cannot directly generate low-pressure steam under the condition of counter-flow heat exchange but can obtain more useful output heat. The largest useful output heat is 20.3 kW, which is higher than that in the case of parallel-flow heat exchange. The generation of low-pressure steam has certain requirements on the mode of heat transfer. The largest internal gross temperature lift of 28.1°C corresponds to the smallest coefficient of performance of 0.22 when the heating water flow rate is 2.1 m3/h. The performance of the single-stage absorption heat transformer can be improved to some extent by increasing the heating water flow rate.

Study on the heating performance of absorption-compression hybrid heat pump in severe cold regions

Traditional heating methods are polluted and inefficient, more than, conventional air source absorption heat pump has poor heating performance at low temperature. To overcome these shortcomings, by sharing evaporator and condenser from absorption and compression heat pump, the novel air source absorption-compression hybrid heat pump (ASACHHP) is proposed. The thermodynamic models of ASACHHP are established and verified. Under different internal thermodynamic parameters, the coefficient of performance (COP) and exergy coefficient of performance (ECOP) of ASACHHP are compared. The maximum COP that can be achieved under given research conditions is 1.241–1.420, the maximum ECOP is 0.697–0.756. In comparison with common absorption heating systems, ASACHHP can provide hot water above 60 °C when the ambient temperature is below −10 °C, which shows better low-temperature applicability than single-stage ASAHP. When the ambient temperature is suitable, ASACHHP can be switched to a single-stage absorption cycle. Although the heating range and environmental application range of ASACHHP are slightly reduced compared with the high-pressure compression-assisted absorption system, ASACHHP has the highest COP among the common absorption heating improved systems, the improving rate can be 1.5–13.0%. In general, ASACHHP is a kind of clean and efficient alternative heating technology in severe cold regions.

Improved Exergy Evaluation of Ammonia-Water Absorption Refrigeration System Using Inverse Method

Abstract In this study, the compatibility of exergy destruction minimization (EDM) as the main objective is checked by plotting coefficient of performance (COP), exergy coefficient of performance (ECOP), and overall exergy destruction rate by simultaneously varying input operating temperatures for a 28 TR cooling load absorption system. The component-wise variation in exergy destruction is also considered and it is found that the maxima of COP and ECOP, and the minima of overall exergy destruction lies on a common point, and when the variation of operating temperatures is further extended, the exergy destruction in one of the component becomes negative, which marks the upper bound of the present analysis. At highest valid generator temperature (155 °C), the minimum possible overall exergy destruction rate is 53.50 kW and maximum COP is 0.523. Through inverse optimization (IO) using dragonfly algorithm (DA), the same overall exergy destruction rate is achieved for a wide range of generator temperatures much below than 155 °C, and as low as 127.34 °C. The above variation is explained in terms of flow ratio, mass flowrate of steam, and mass flowrate of cooling water.

Thermal modelling of PVT-CPC integrated vapour absorption refrigeration system

In this paper, the single effect vapour absorption refrigeration (VAR) system is integrated with fully covered semi-transparent photovoltaic thermal-compound parabolic concentrator (PVT-CPC) collector. The thermal model of this integrated system has been obtained under constant mass flow rate mode of the collector. The thermal model is based on the basic energy balance of each component of the integrated system in terms of design and climatic parameters. Also, solar coefficient of performance (SCOP), refrigeration coefficient of performance (RCOP) and exergy coefficient of performance (ECOP) have been evaluated for the proposed integrated system. The numerical simulation have been performed for the climatic conditions of capital city of INDIA (i.e. New Delhi) with the help of MATLAB R2015a. From the results and discussion, it is found that PVT-CPC integrated with VAR system is most suitable for the self-sustained operation up to five hours for a typical day of summer month of New Delhi.

Performance Analyses of Photovoltaic Thermal Integrated Concentrator Collector Combined With Single Effect Absorption Cooling Cycle: Constant Flow Rate Mode

Abstract In the present communication, performance analyses of interconnected N number of fully covered semitransparent photovoltaic thermal integrated concentrator collectors combined with single effect vapor absorption refrigeration system have been carried out. The proposed system was analyzed under the constant mass flowrate of collectors’ fluid. Mathematical expressions have also been derived for generator temperature of the absorption unit as a function of both design and operating parameters. Further, simulations have been performed for a typical day of May month of New Delhi climatic conditions. Performance parameters have been evaluated such as collector exit temperature, generator inlet temperature, electrical power output, electrical efficiency, overall thermal energy gain, instantaneous thermal efficiency, overall exergy gain and coefficient of performance of the absorption system. The simulation code has been written in matlab. From the present analyses, the following salient conclusions have been drawn: Operating generator temperature of the absorption system is suitable for five number of photovoltaic thermal-integrated parabolic concentrator collector connected in series. The proposed system will continue operating for 5 h during May month in New Delhi climate conditions. The maximum solar coefficient of performance, refrigeration coefficient of performance, and exergy coefficient of performance are reported as 0.1551, 0.8344, and 0.2697, respectively, for the proposed novel system under given design and operating conditions. Additionally, the effects of other design parameters of this novel system have also been investigated.

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

Adsorptive heat transformer is a promising technology for waster heat recovery and global energy conservation. A novel cyclic adsorption heating system based on direct contact heat exchange method has been established for the purpose of high-temperature steam generation from hot water. Pre-adsorption is originally proposed before generation phase to enhance the system performance with composite zeolite 13X and MgSO4 in the open-loop adsorption heating system. Composite zeolite is prepared by impregnation method. Experimental results show steam with temperature higher than 200°C is generated from inlet water at 72.0°C. During regeneration phase, dry air at 130°C and relative humidity of 7.37% is employed. Gross temperature lift is 95.0°C to 103°C for different pre-adsorption conditions. The effective steam generation time with pre-adsorption temperature at 90.0°C is prolonged by 27.4%. Meanwhile, the mass of steam is elevated by 16.2% compared with the cycle without pre-adsorption. Exergy coefficient of performance is upgraded by 14.7% and specific heating power for steam generation is increased by 16.0%. The pre-adsorption operation achieved the goal of recovery of low-grade waste steam on adsorbents to enhance the subsequent high-temperature steam generation. After pre-adsorption operation, the packed bed reaches adsorption and thermal equilibrium more quickly during generation phase. Thus, dynamic steam generation is significantly intensified and then system performance is improved correspondingly.

Gaseous solubility and thermodynamic performance of absorption system using R1234yf/IL working pairs

To overcome the weaknesses of traditional working pairs (H2O/LiBr and NH3/H2O) in the absorption-refrigeration systems, 2,3,3,3-tetrafluoroprop-1-ene (R1234yf)/ionic liquid (IL) as a promising working pair has attracted wide attention. Using an isochoric saturation method, the solubilities were measured for three working pairs (R1234yf/[emim][Ac], R1234yf/[bmim][Ac] and R1234yf/[P66614][Cl]) from 283.15 to 343.15 K and the data was correlated by the NRTL model. Solubilities rise with a decrease in temperature and an increase in pressure. Highest solubility is in [P66614][Cl], followed by [bmim][[Ac] and [emim][Ac]. The cooling performance was studied for the single-effect and compression-assisted system using several R1234yf/IL mixtures. The effects of compression ratio, generation and evaporation temperature on the coefficient performance (COP) and circulation ratio were analyzed. Under the condensation temperature of 303 K, generation temperature of 363 K and absorption temperature of 303 K, the maximum COPs for [emim][Ac], [bmim][Ac] and [P66614][Cl] are respectively 013, 0.23, and 0.46 in the compression-assisted system. [P66614][Cl] has the highest COP and exergy coefficient of performance (ECOP) while [emim][Ac] shows lowest under the same condition.

Thermodynamic Modeling and Performance Optimization of a Solar-Assisted Vapor Absorption Refrigeration System (SAVARS)

A thermodynamic steady-state model for a single-effect lithium bromide–water (LiBr-H2O)-based vapor absorption refrigeration system of 17.5[Formula: see text]kW capacities has been presented using the first and second laws of thermodynamics. The mass, energy and exergy balance equations in each component of the vapor absorption cycle have been fitted into a computer program to carry out the calculation using the thermo-physical properties of the working fluid. The performance parameters such as coefficient of performance (COP), exergy coefficient of performance (ECOP), total exergy destruction (TED), etc. have been evaluated considering different temperatures in generator and evaporator, different LiBr concentrations in the weak and strong LiBr-H2O solution and different solution heat exchanger effectiveness. The model evaluated the optimum performance parameters like COP, ECOP, TED, etc. of the vapor absorption system by using Design Expert-12 software for an application like on-farm cooling or transit storage of fruits and vegetables.

Experimental assessment of heat exchangers with nested helical coils for an absorption heat transformer

ABSTRACT The studies of nested helical coil heat exchangers for an absorption heat transformer are very limited, although this arrangement has a greater heat transfer area in a smaller volume. The heat exchangers are vertically placed to develop the desorption, condensation, evaporation and absorption processes by falling film mode. The usage of energy from point of qualitative view in these times is mandatory, due to the fossil fuels reduction and pollution. This experimental study analyses the behavior the nested helical coils heat exchangers through the first and second law of thermodynamics. The physical and chemical exergy for the main components and whole system is calculated by using the conventional method. All the experimental tests are carried out by varying the source temperature from 343.15 to 358.15 K with heating mass flow rate in the generator between 0.07 and 0.13 kg/s. For this study, the condensation and absorption processes reach the highest exergy destruction at high temperatures, while the solution heat exchanger presents the lowest irreversibility. The exergy coefficient of performance always improves when the supplied heat in the generator increases owing to the heating mass flow rate and temperature, however there is an increment considerably of total irreversibility at 349.15 K.

Comprehensive exergy analysis and optimization of operating parameters for double effect parallel flow absorption refrigeration Cycle

In this communication, comprehensive exergy analysis has been discussed for double effect parallel flow direct as well as indirect fired vapour absorption refrigeration systems using Lithium bromide-water as working fluid. The temperatures in the main generator and intermediate generator and condenser are optimized parametrically. The solution distribution ratio is also optimized considering exergy coefficient of performance (ECOP) and exergy destruction rate (EDR) as the objective functions. Further, comparison of parallel flow cycle with series flow configuration are presented for same operating parameters. Moreover, the effect of the temperature difference between intermediate generator and intermediate condenser of both the double effect parallel and series flow cycles are discussed. Results indicate that the maximum ECOP of the parallel flow cycle is 3–6% higher than the series flow cycle and minimum EDR is about 4% lower as compared to the series flow configuration. Furthermore, optimum temperature of intermediate generator for parallel flow cycle is significantly lower than the series flow cycle while main generator temperature is higher. Optimum parameters are tabulated for both series and parallel flow cycles, which will help to the design engineers.

Performance of SrBr2·6H2O based seasonal thermochemical heat storage in a novel multilayered sieve reactor

The salt hydrate-based thermochemical heat storage (TCHS) system, based on a reversible solid-gas chemical reaction, is currently a key technique used to store heat for later discharge. Strontium bromide hexahydrate (SrBr2·6H2O) is one of the most promising candidate materials in seasonal heat storage for residential heating due to its lower desorption temperature. This study develops and numerically investigates a novel multilayered sieve reactor that can promote dehydration and hydration reactions. This paper focuses on the interaction between the porous reactive salt beds and the vapor in an open system. The required time to totally dehydrate and hydrate the salt beds are approximately 1180 min and 940 min, respectively. The effects of various operating conditions such as input temperature, inlet velocity, and relative humidity of fluid on charging and discharging are studied, as well as the influence of thermal conductivity, permeability and kinetic factors. For instance, the reaction kinetic factor Rkin = 1.0 × 10−4 is a threshold in this model. The optimized salt beds reduce dehydration time by 11.4% (130 min). High volumetric thermal powers are obtained for the multilayered sieve reactor, although the values decrease with the degree of conversion. The results indicate that the thermal efficiency η, thermal coefficient of performance (COPth), and exergy coefficient of performance (COPex) of charging are 85.2%, 72.4%, and 21.3%, respectively, and the corresponding values for discharging are 94.5%, 71.5%, and 21.1%, respectively, for the model studied.

High-temperature steam generation from low-grade waste heat from an adsorptive heat transformer with composite zeolite-13X/CaCl2

High-temperature adsorptive heat transformer for steam generation has been experimentally investigated by introducing composite zeolite/CaCl2-water working pair based on a direct contact method. Composite adsorbents are prepared by immersing zeolite into different mass concentrations of CaCl2 solutions. SEM (Scanning Electron Microscope) is used to observe the surface structure of the composite zeolite. XRF (X-Ray Fluorescence) is selected to analyze the element mass ratios in adsorbents. BET (Brunauer-Emmett-Teller models) is employed to calculate the pore characteristic of pores inside zeolite. Characterization results confirm the success of preparation for composite zeolite. Adsorption properties including equilibrium water uptake and integral adsorption heat are measured for basic evaluation. Overall volumetric adsorption heat is increased by 13.1% for CA40% (immersion of zeolite in CaCl2 solution concentration at 40%) compared with that for 13X. Cyclic experiments are conducted to test the design of system. Superheated steam above 200 °C is generated for 13X and different composite zeolites from hot water below 80 °C. Dry gas at 130 °C is used for regeneration. Gross temperature lift is more than 100 °C for single stage zeolite adsorptive heat transformer. Dynamic steam generation on interface between water and zeolite is enhanced with more heat released by using composite zeolite. Subsequently, adsorption equilibrium is easier to be achieved inside the whole range of the packed bed. Effective time ratio for steam generation is elevated by 18.6% for CA40% compared with that for 13X. Mass of generated steam is raised by 12.9% simultaneously. Both the time and mass of generated steam have been obviously promoted with the increase of CaCl2 impregnated in zeolite. COPex (Exergy Coefficient of Performance) is kept constant while SHP (Specific Heating Power for steam generation) is increased by 12.6%.

Enhanced thermodynamic assessments of the novel desiccant air cooling system for sustainable energy future

In this study, a newly developed desiccant air cooling system with desiccant wheel, sensible heat wheel and evaporative air cooler is assessed. The main purpose of the study is to investigate the developed desiccant air cooling system and compare its performance with the previous studies to show reliability of the developed system. The energy, exergy and sustainability analyses methods are used to assess the system. The data are obtained at 35 °C and 101.3 kPa environment condition. According to the exergy analysis, this system can be largely improved. The electrically and thermally driven energy coefficient of performance of the overall system (6.71 and 0.77) are higher than the corresponding exergy coefficient of performance (0.198 and 0.463). Energy coefficient of performance shows that the performance of the overall system is high, however electrically driven exergy coefficient of performance shows that some modifications can be realized in order to improve the final performance of the system. Among the components, desiccant wheel should be improved, because its exergy destruction ratio is 42.87% and the exergy efficiency is about 38.35%. On the other hand, sensible heat wheel exergy destruction ratio is computed as 10.35%, and its exergy efficiency is determined to be 57.69%. Among the components, desiccant wheel has less sustainability than others considering a combination work together. The effectiveness of the components from maximum to minimum are as sensible heat wheel, regenerative evaporative cooler and desiccant wheel, respectively. For better effectiveness, the component devices should be working around similar high level. So, the urgent improvements for the devices are in the order of desiccant wheel, regenerative evaporative cooler and sensible heat wheel, respectively.

Compression-assisted absorption cycles using ammonia and various ionic liquids for cleaner heating

Abstract To overcome the shortcomings of the conventional working fluids, ammonia/ionic liquids were analyzed for the compression-assisted absorption heat pump. The property models of different ammonia/ionic liquid mixtures and the thermodynamic model of the proposed cycle were established with verified accuracy. The primary energy efficiency and exergy coefficient of performance under various conditions were compared. N, N-dimethylethanolammonium acetate performed the best under favorable working conditions, while 1,3-dimethylimidazolium dimethylphosphate and 1-ethyl-3-methylimidazolium tetrafluoroborate performed better under other conditions. 1,3-dimethylimidazolium dimethylphosphate can operate under the lowest generation/evaporation temperatures. Compared to ammonia/water, ammonia/N, N-dimethylethanolammonium acetate showed quite similar or slightly higher efficiencies under favorable conditions, ranging in 1.026–1.491. The exergy efficiency generally increased first and decreased later with the increase of the generation/condensation/evaporation temperature and the compression ratio. With optimal compression ratios of 1.8–2.1, the maximum primary energy efficiencies were 1.339–1.382 for different ammonia/ionic liquids. The primary energy efficiencies of the compression-assisted absorption heating were improved by 36–69% compared to gas boilers, by 0.2–54% compared to the conventional absorption cycles.

Comparisons of different ionic liquids combined with trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) as absorption working fluids

To overcome the shortcomings of conventional absorption working fluids, the novel trans-1,3,3,3-tetrafluoropropene (R1234ze(E)) and ionic liquid (IL) are studied. The R1234ze(E)/IL properties and different absorption cycles are modeled with verified accuracy. The energy and exergy performance are comparatively investigated for four different ILs, 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]), 1-hexyl-3-methylimidazolium tetrafluoroborate([hmim][BF4]), 1-octyl-3-methylimidazolium tetrafluoroborate([omim][BF4]) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide([hmim][Tf2N]). Under an evaporation temperature of 5 °C, the minimum generation temperature is 44 °C, and the maximum coefficient of performance (COP) is respectively 0.264, 0.390, 0.398 and 0.431 for different ILs. Under a generation temperature of 90 °C, the minimum evaporation temperature is −22 °C, with maximum COP of 0.438, 0.556, 0.580 and 0.606. [emim][BF4] always has the lowest COP and exergy COP, while [hmim][Tf2N] has the highest values under most conditions. The main objectives are contributing novel potential working pairs, improving the efficiency of R1234ze(E)/ILs, as well as selecting the best-performing R1234ze(E)/IL mixture and offering directions for future improvement.