Alternative Working Fluids Research Articles

Double-effect/two-stage compression-assisted absorption thermal energy storage using LiNO3-ionic liquids/H2O working fluids

A novel double-effect/two-stage compression-assisted absorption thermal energy storage system using LiNO3-[BMIM] (1-butyl-3-methylimidazolium) NO3/H2O for combined cooling and heating is proposed to enhance thermal performance under a larger concentration glide without crystallization. The thermodynamic calculation is conducted by Matlab based on the measured thermophysical properties, and its performance is compared with that of a system using other working fluids. The results show that this proposed system using LiNO3-ionic liquids/H2O with compressor assistance achieves a higher coefficient of performance and energy storage density at a larger concentration glide without crystallization. In comparison to LiBr/H2O, the generation temperature of this system using LiNO3-ionic liquids/H2O is reduced by over 50 K at a larger concentration f, which is beneficial for the utilization of solar energy. As the discharging temperature increases from 321.15 K to 333.15 K and f from 0.08 to 0.20, this novel system using LiNO3-[BMIM]NO3/H2O obtains the largest coefficient of performance of 1.36 and exergetic coefficient of performance of 0.46 at generation temperature below 354.2 K, compared to LiNO3/H2O and LiNO3-[DMIM][DMP]/H2O. Moreover, the maximum energy storage density based on LiNO3-[BMIM]NO3/H2O reaches 695.4 kJ/kg at a discharging temperature of 333.15 K and a f of 0.20. In comparison to the existing absorption thermal energy storage systems, the proposed system using LiNO3-[BMIM]NO3/H2O also shows outstanding performance in various aspects. This new system with the LiNO3-[BMIM]NO3/H2O alternative working fluid has a great potential for utilizing solar energy for combined cooling and heating.

Synthesis of cis-1,3,3,3-tetrafluoropropene by catalytic isomerization of trans-1,3,3,3-tetrafluoropropene over alumina catalysts

Low global warming potential (GWP) refrigerant cis-1,3,3,3-tetrafluoropropene (HFO-1234ze(Z)) is a promising alternative working fluid for high-temperature heat pump designed for heat recovery in the industrial sector. As part of an effort to mass production of HFO-1234ze(Z), the isomerization of trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)) to HFO-1234ze(Z) is performed to develop a process with high selectivity and high yield. Herein, we prepared the alumina catalysts via calcination, fluorination, and alkaline modification and tested for the trans-cis isomerization of HFO-1234ze. As a result, the alumina catalyst with appropriate weak Lewis acid sites tended to form HFO-1234ze(Z) with selectivity levels of about 97 %–99 % and no deactivation was observed following time on stream of 200 h. Proposed reaction mechanisms were described to understand the reactions over alumina surface. The present work provides a highly efficient synthetic process for industrial production of HFO-1234ze(Z).

An experimental study of an Organic Rankine Cycle utilizing HCFO-1233zd(E) as a drop-in replacement for HFC-245fa for ultra-low-grade waste heat recovery

The use of Organic Rankine Cycles (ORCs) for waste heat recovery can reduce energy consumption in data centers, which in turn benefits the environment through the reduction of carbon-based fuels. However, data center applications exist in the ultra-low temperature range (40 − 80℃), making efficient and economical operation challenging. The operating fluids that are viable in this temperature range are limited, so it can be a challenge to identify a suitable drop-in replacement for a proven fluid. In this study, the use of HCFO-1233zd(E) is explored to determine its suitability as a low Global Warming Potential and zero Ozone Depletion Potential alternative to the more common HFC-245fa in ultra-low temperature data center applications. This study features the first known comprehensive comparison between the alternative working fluid HCFO-1233zd(E) and HFC-245fa in a lab-scale experimental ORC under ultra-low-grade waste heat temperatures. The results of this study show that the lower HFCO-1233zd(E) saturated pressures impact the ORC operation by reducing the mass flow rate by 3–21%, thereby reducing the heat transfer across the evaporator and condenser. However, the peak thermal efficiency of the lab-scale system is seen to increase with the use of HCFO-1233zd(E) to a high of 5.0% from 4.6% with HFC-245fa. This work also identifies the minimum feasible waste heat temperature as 55 °C for a successful ORC application with both working fluids.

Lubricating condition evaluation of the rotary compressor under high ambient temperature

Abstract Propane has been suggested as one of the alternative working fluids for room air conditioners in hot climate areas because of its excellent environmental properties and lower discharge temperature though there still is concern about its flammability. The lubricating condition of rotor bearings system should also be emphasized because a heavier load and lower viscosity in the oil sump could impair the reliability of rotary compressor under high ambient temperature. In this study, in order to obtain the input of simulation, the dynamic pressures and viscosity of a R290 air conditioner are experimentally measured under several conditions. On these bases, lubricating characteristics are numerically simulated by coupling the dynamics equation of crank shaft and the modified Reynolds equation of oil film using finite element method. The results show that the load on crank under 50 °C is twice as large as that of 30 °C while the viscosity of bottom oil sump decreases from 1.89 to 1.59 mPa⋅s. Simulation results imply that the minimum oil film thickness decreased to 0.44 µm under 50 °C, in which asperity contact force peaks at 3 N when arithmetic mean roughness is 0.2 µm. Asperity contact force would significantly increase to 174 N if surface roughness is 0.6 µm and boundary lubrication regime is reached. Strategies to increase oil sump viscosity is recommended to avoid adhesive wear in this case.

Measurement of Viscosity of a Binary Mixture of R1123 + R32 Refrigerant by Tandem Capillary Tube Method

A refrigerant mixture of R1123 + R32 is expected to be an alternative working fluid for refrigeration systems, organic Rankine cycle and heat pumps due to its lower global warming potential and transport properties. The goals of this work are to measure the viscosity of the liquid and vapor phases of this mixture refrigerant. Consequently, the viscosity of mixture refrigerant was measured by the tandem capillary tube method up to 4.5 MPa over a temperature range from 250.64 K to 312.61 K for the liquid phase and from 323.35 K to 382.88 K in the vapor phase, respectively. Mass fractions of measured R1123/R32 refrigerant mixture were 0.428/0.572 in the liquid phase and 0.425/0.575 in the vapor phase. The obtained experimental data were compared with estimated values of the ECS model, and the average absolute deviation (AAD) was found at 3.63 % in the liquid phase and 2.45 % of the vapor phase. Also, the measured liquid and vapor viscosity data were correlated with the Grunberg–Nissan method and Wilke mixture correlation, respectively, while the AAD was 1.33 % for liquid and 3.69 % for vapor phases. The total combined standard uncertainties in the liquid and vapor viscosity measurements were estimated to be less than 2.9 % and 3.0 %, respectively.

Flammability issue of hydrocarbons in air conditioning industry

As per Kigali Amendment, there is need to amend regulations to control use of HydroFlouroCarbons (HFCs) in Refrigeration and Air conditioning sector worldwide. Out of available alternatives, Hydrocarbons (HCs) will be found as suitable alternative working fluid in future in this sector. Hydrocarbon refrigerants or blends provide better energy efficiency and are having very less Global Warming Potential (GWP). However, care should be required due to its flammability while using Hydrocarbons in this sector. In this paper, flammability aspect of Hydrocarbon Refrigerants will be discussed. Safety standards and necessary precautions will be discussed while using Hydrocarbons in Air conditioning applications.

HCFO-1224yd(Z) as HFC-245fa drop-in alternative in low temperature ORC systems: Experimental analysis in a waste heat recovery real facility

The organic Rankine cycle (ORC) has been growing in importance as a technology for producing electricity from low temperature waste and renewable heat sources. In small-scale applications, the most used working fluid has been HFC-245fa, although this is being substituted for low GWP alternatives. A new HCFO working fluid, HCFO-1224yd(Z), has appeared as a possible alternative for HFC-245fa. In this study, this alternative working fluid is analysed and, finally, the working fluid is experimentally tested as drop-in alternative in a commercial ORC system. The main purpose is to determine the feasibility of using HCFO-1224yd(Z) as a drop-in replacement for HFC-245fa in a real facility that was initially designed to operate with HFC-245fa. The results show how the use of HCFO-1224yd(Z) offers power output that ranges from 7.5% to 17.4% lower than that provided by HFC-245fa. Although HFC-245fa offers higher power output, the results show that HCFO-1224yd(Z) offers up to 7.7% higher cycle net efficiency; this is due to the higher input thermal rate required by HFC-245fa. Finally, HCFO-1224yd(Z) has been stated as a suitable alternative to HFC-245fa as a drop-in replacement in a small-scale, low-temperature ORC, which increases its attractiveness for heat source with higher temperatures.

A Statistical Approach to Determine Optimal Models for IUPAC-Classified Adsorption Isotherms

Adsorption heat transformation (AHT) systems can play a major role in protecting our environment by decreasing the usage of fossil fuels and utilizing natural and alternative working fluids. The adsorption isotherm is the most important feature in characterizing an AHT system. There are eight types of International Union of Pure and Applied Chemistry (IUPAC) classified adsorption isotherms for different “adsorbent-adsorbate” pairs with numerous empirical or semi-empirical mathematical models to fit them. Researchers face difficulties in choosing the best isotherm model to describe their experimental findings as there are several models for a single type of adsorption isotherm. This study presents the optimal models for all eight types of isotherms employing several useful statistical approaches such as average error; confidence interval (CI), information criterion (ICs), and proportion tests using bootstrap sampling. Isotherm data of 13 working pairs (which include all eight types of IUPAC isotherms) for AHT applications are extracted from literature and fitted with appropriate models using two error functions. It was found that modified Brunauer–Emmet–Teller (BET) for Type-I(a) and Type-II; Tóth for Type-I(b); GAB for Type-III; Ng et al. model for Type-IV(a) and Type-IV(b); Sun and Chakraborty model for Type-V; and Yahia et al. model for Type-VI are the most appropriate as they ensure less information loss compared to other models. Moreover; the findings are affirmed using selection probability; overall; and pairwise proportion tests. The present findings are important in the rigorous analysis of isotherm data.

Thermodynamic assessment, screening and trade-offs in alternative working fluids selection for refrigeration, heat pumping and organic Rankine cycles

Global warming and ozone depletion are leading effects attaching the consideration of environmental organizations. Conversion to alternative hydrofluorocarbons (HFC) refrigerants without chlorine atoms progressed over the last two decades. However recently because of the significant global warming impact of HFCs the hydrofluoroolefins (HFOs) were proposed as new generation alternative refrigerants. This article discussed fluorinated propene based isomers, summarizes refrigerant numbering scheme, flammability, fundamental parameters and thermodynamic properties of isomers containing five-, four- and three-fluorine atoms respectively. In the present study evaluated the refrigerant performance in an idealized vapor compression refrigeration cycle. Presented HFC and HFO blends as non-flammable refrigerants with relatively low global warming potential values.

Mechanism study of sinking electrical discharge machining using water-in-oil nanoemulsion

Water-in-oil (W/O) nanoemulsion can be an alternative working fluid to kerosene in sinking electrical discharge machining (EDM). W/O nanoemulsion can improve the material removal rate, reduce the relative electrode wear rate, and alleviate the pollution of conventional sinking EDM using kerosene. However, the mechanism of sinking EDM using W/O nanoemulsion is not fully understood. In this study, a set of comparative experiments of single-pulse discharge is conducted in W/O nanoemulsion and kerosene to clarify the discharge mechanism of W/O nanoemulsion. The main machining parameters, which are crucial in actual sinking EDM, including pulse duration, peak current, and electrode polarity, are investigated. Precise geometries of the corresponding craters generated at the critical discharge gap are determined by the combination of optical instruments and 3D-rebuilt method. The effect of the working fluid flushing on the discharge machining is also analyzed. The results demonstrate that by the introduction of nanodroplets, the critical discharge gap is enlarged in W/O nanoemulsion. Compared with kerosene, W/O nanoemulsion has higher viscosity and density, which leads to stronger restrictions to the plasma channel and the motions of bubbles; therefore, larger volumes of melted materials and craters are formed in W/O nanoemulsion. This difference between W/O nanoemulsion and kerosene rises with the increasing discharge energy. Moreover, the restriction effect from working fluid is insignificant in the case of negative electrode polarity.

Experimental study on an acetone-charged loop heat pipe with a nickel wick

In order to push forward the commercial applications of loop heat pipe (LHP) especially in an environment where people are present, it is of great importance to explore alternative working fluids to substitute the commonly used anhydrous ammonia. In this work, an acetone-charged LHP with a nickel wick is developed and experimentally studied, mainly focusing on its startup and heat transport capability. Based on the experimental results and theoretical analysis, some important conclusions have been drawn, as summarized below: 1) The acetone-charged LHP with 2 mm inner diameter pipeline can successfully realize the startup, and reach a heat transport capability of 60 W × 0.5 m; 2) When the inner diameter of the pipeline is increased from 2 to 4 mm, the LHP can start up with a much smaller heat load, i.e., 5 W, achieving a much lower steady-state operating temperature; 3) When the inner diameter of the pipeline is increased from 2 to 4 mm, the heat transport capability of the acetone-charged LHP can be increased from 60 to 100 W. 4) Adverse elevation affects greatly the heat transport capability of the acetone-charged LHP. With the adverse elevation increasing from 0 to 0.2 m, the heat transport capability is decreased from 100 to 60 W. The physical mechanisms responsible for the experimental results mentioned above have been analyzed and discussed. This work contributes to a better understanding on the operating performance and characteristics of the acetone-charged LHP, providing good design guidance and reference for its future applications.

Fluid Retrofit for Existing Vapor Compression Refrigeration Systems and Heat Pumps: Evaluation of Different Models

The global warming potential of many working fluids used nowadays for vapor compression refrigeration systems and heat pumps is very high. Many of such fluids, which are used in currently operating refrigerators and heat pumps, will have to be replaced. In order to avoid a redesign of the system, it would be very helpful if efficient and ecological alternative working fluids for a given plant could be found. With modern process simulation tools such a selection procedure seems possible. However, it remains unclear how detailed such a model of a concrete plant design has to be to obtain a reliable working fluid ranking. A vapor compression heat pump test-rig is used as an example and simulated by thermodynamic models with different levels of complexity to investigate this question. Experimental results for numerous working fluids are compared with models of different complexity. Simple cycle calculations, as often used in the literature, lead to incorrect results regarding the efficiency and are not recommended to find replacement fluids for existing plants. Adding a compressor model improves the simulations significantly and leads to reliable fluid rankings but this is not sufficient to judge the adequacy of the heat exchanger sizes and whether a given cooling or heating task can be fulfilled with a certain fluid. With a model of highest complexity, including an extensive model for the heat exchangers, this question can also be answered.

Thermodynamic and economic analyses of a hybrid waste-driven CHP–ORC plant with exhaust heat recovery

A smart hybrid power plant comprising a waste-fired CHP (combined heat and power) plant accompanied by a small-scale organic Rankine cycle was recently designed and analyzed thermodynamically. The objective of this hybridization is to maximize the share of electricity production of waste-CHP plants rather than a higher heat production rate in a cost-effective manner. In this work, utilization of the exergy of the hot flue gas of the waste-fired CHP unit in order to increase the potential of the organic Rankine cycle for maximizing the net power output of the hybrid cycle is proposed and techno-economically analyzed. In addition, the effect of using alternative environmentally-friendly organic working fluids on the performance of the system was investigated. The results of the study show that by the flue gas potential utilization of the same CHP unit, the size of the organic Rankine cycle may increase significantly, leading to a larger power output of the plant. As such, the net exergy and energy efficiency values of the combined plant in various operational conditions are improved compared to its primary configuration by, respectively, about 10% and 20%, when both of the main CHP cycle and the organic Rankine cycle are working at nominal load. In addition, this exergy utilization is beneficial economically as well, decreasing the payback period of the parallelization project by about 10% (from 7.4 years to 6.7 years). The alternative organic working fluid does not make a significant change in the technical and economic performance indices of the system.

Influence of Six Carbon-Based Nanomaterials on the Rheological Properties of Nanofluids.

Nanofluids, dispersions of nanosized solid particles in liquids, have been conceived as thermally-improved heat transfer fluids from their conception. More recently, they have also been considered as alternative working fluids to improve the performance of direct absorption solar thermal collectors, even at low nanoadditive concentrations. Carbon-based nanomaterials have been breaking ground in both applications as nanoadditives during the last decade due to their high thermal conductivities and the huge transformation of optical properties that their addition involves. In any application field, rheological behavior became a central concern because of its implications in the pumping power consumption. In this work, the rheological behavior of four different loaded dispersions (0.25, 0.50, 1.0, and 2.0 wt%) of six carbon-based nanomaterials (carbon black, two different phase content nanodiamonds, two different purity graphite/diamond mixtures, and sulfonic acid-functionalized graphene nanoplatelets) in ethylene glycol:water mixture 50:50 vol% have been analysed. For this purpose, a rotational rheometer with double cone geometry was employed, which included a special cover to avoid mass losses due to evaporation at elevated temperatures. The flow curves of the twenty-four nanofluids and the base fluid were obtained by varying the shear rate between 1 and 1000 s−1 for seven different temperatures in the range from 283.15 to 353.15 K. The shear-thinning behaviors identified, as well as their dependences on carbon-based nanomaterial, concentration, and temperature, were analyzed. In addition, oscillatory tests were performed for samples with the clearest Non-Newtonian response, varying the deformation from 0.1 to 1000% with constant frequency and temperature. The dependence of the behaviors identified on the employed carbon-based nanomaterial was described.

How Effective Is Carbon Dioxide as an Alternative Fracturing Fluid?

Summary Massive hydraulic fracturing requires an enormous consumption of water and introduces many potential environmental issues. In addition, water-based fluid tends to be trapped in formations, reducing oil/gas-phase relative permeability, and causes clay-mineral swelling, which lowers absolute permeability. Carbon dioxide (CO2) is seen as a promising alternative working fluid that poses no formation-damage risk, and it can stimulate more-complex and extensive fracture networks. However, very little, if any, extant research has quantitatively analyzed the effectiveness of CO2 fracturing, except for some qualitative fracturing experiments that are based on acoustic emissions. In this study, we systematically examine water and CO2 fracturing, and compare their performance on the basis of a rigorously coupled geomechanics and a fluid-heat-flow model. Parameters investigated include fluid viscosity, compressibility, in-situ stress, and rock permeability, illustrating how they affect breakdown pressure (BP) and leakoff, as well as fracturing effectiveness. It is found that (1) CO2 has the potential to lower BP, benefiting the propagation of fractures; (2) water fracturing tends to create wider and longer tensile fractures compared with CO2 fracturing, thereby facilitating proppant transport and placement; (3) CO2 fracturing could dramatically enhance the complexity of artificial fracture networks even under high-stress-anisotropy conditions; (4) thickened CO2 tends to generate simpler fracture networks than does supercritical CO2 (SC-CO2), but still more-complex fracture networks than fresh water; and (5) the alternative fracturing scheme (i.e., SC-CO2 fracturing followed by thickened-CO2 fracturing) can readily create complex fracture networks and carry proppant to keep hydraulic fractures open. This study reveals that, for intact reservoirs, water-based fracturing can achieve better fracturing performance than CO2 fracturing; however, for naturally fractured reservoirs, CO2 fracturing can constitute an effective way to stimulate tight/shale oil/gas reservoirs, thereby improving oil/gas production.

Molecular simulation studies on refrigerants past – present – future

Refrigeration has become essential in our society and for our standard of living. Though environmental issues regarding the refrigerants that circulate in heating, ventilation and air conditioning (HVAC&R) cycles have resulted in enormous consequences for this technology sector. Twice in the last three decades, phase-out regulations got effective for established refrigerants, which has necessitated the adoption of suitable replacements, related to the need for data on the thermophysical properties of potential alternative working fluids. In this context, molecular simulation has emerged as important compliment to experimental studies, and we here provide an overview on molecular modelling approaches and simulation studies on different generations of refrigerants, though with focus on the current fourth generation of working fluids, i.e. hydrofluoroolefins (HFO).Due to increasing difficulties in meeting all different selection criteria for a specific application by a single component refrigerant, blends are becoming more and more important. We here present recent simulation results for vapor-liquid equilibria of different binary mixtures based on the newly introduced compound trifluoroethene (HFO-1123) as demonstrative example of the benefit of molecular simulation to provide information on mixtures for which no experimental data are available yet.We also discuss studies on conformational isomers and the development of equations of state as further research topics in which molecular simulations are already playing an important role in complementing experimental studies. Finally we highlight some future research directions in which simulation studies can be expected to make an important contribution to the understanding and theoretical modeling of refrigerant properties.

Vapor liquid equilibrium prediction of methanol–ionic liquid systems using UNIFAC model to select alternative working fluids of absorption cycle

AbstractThe purpose of this paper is to study the working fluids in absorption cycle containing methanol (CH3OH) as the refrigerant and the imidazolium ionic liquid (IL) as the absorbent. The UNIFAC model was implemented to correlate the published experimental vapor liquid equilibrium data of CH3OH–IL working fluids and 14 new group interaction parameters between CH3OH and ILs were obtained. Method reliability and applicability were evaluated by calculating the vapor pressures of five CH3OH–IL working fluids. The ILs contained 1‐methyl‐3‐methylimidazolium dimethylphosphate ([Dmim][DMP]), 1‐ethyl‐3‐methylimidazolium ethyl sulfate ([Emim][ES]), 1‐ethyl‐3‐methylimidazolium diethylphosphate ([Emim][DEP]), 1‐butyl‐3‐methylimidazolium dibutylphosphate ([Bmim][DBP]), and 1‐ethyl‐3‐ethylimidazolium diethylphosphate ([Eeim][DEP]). The average absolute relative deviations for the vapor pressures between the calculated results and the experimental data were 0.91%, 1.67%, 0.66%, 0.75%, and 2.1%, respectively. Then, the CH3OH–IL systems without experimental data were predicted. Comparisons of the vapor pressure and excess Gibbs function of the studied CH3OH–IL systems, CH3OH‐[Hmim][DEP] (1‐hexyl‐3‐methylimidazolium diethylphosphate) system, as an alternative working fluid, was found to have potential to improve the absorption cycle performance upon more research work.

Thermodynamic analysis of a direct expansion solar-assisted heat pump system working with R290 as a drop-in substitute for R22

The thermodynamic analysis of direct expansion solar-assisted heat pump system working with R290 as a drop-in substitute for R22 was carried out under the metrological conditions of Calicut, India. A prototype of a DXSAHP system consists of a compressor, an air-cooled condenser with evaporator–collector and thermostatic expansion valve. The experiments were carried during the winter months of 2016. The artificial intelligence technique artificial neural network integrated with genetic algorithm model was presented to predict energy and exergy performance of a system. The energy performance ratio of a system was found to be 5.75% higher and reduced heating capacity of about 6.8% when compared to R22. Similarly, the second law analysis (exergy analysis) of a total system working with R290 was found to be better when compared to baseline refrigerant. The selected alternative working fluid is a hydrocarbon and has zero ozone depletion and negligible global warming potential. Hence, R290 can be used as a drop-in substitute for R22 in DXSAHP systems.

Performance analysis and optimization of an ejector refrigeration system using alternative working fluids under critical and subcritical operation modes

Ejector systems are receiving considerable attention due to their simplicity, lower maintenance requirements, use of low grade heat, longer lifespan and low cost. In this paper an improved model to predict the performance of an ejector refrigeration system under both the critical and subcritical modes of operation was developed and validated. The model predicts ejector performance more precisely compared to studies following the same modeling approach in the literature. Using the developed model, performances with environmentally benign refrigerants, including R1233zd(E), HFO1336mzz(Z), R1234ze(Z), R600, RE245fa2, and RE245fa2 as alternatives to R141b and R245fa were investigated. Furthermore, for ejector area ratios between 4.45 and 12.98, evaporator temperatures between 0 °C and 16 °C and condenser temperatures between 20 and 40 °C, the optimal performance of the ejector system was determined. Results show that for each refrigerant, higher area ratios give higher coefficients of performance, but require higher generator temperatures for better critical condensing temperatures. R600 showed the best performance followed by R1234Ze(Z) and R1233Zd(E) for the entire range of parameters considered. Results further show that there is an optimum generator temperature at each area ratio that maximizes performance. The optimal generator temperature increases as the area ratio and the condensing temperature increase. An alternative and more convenient approach to optimize ejector performance has been suggested in this work.

Performance of hydrocarbon mixture in a direct expansion solar assisted heat pump system

The energy performance of a direct expansion solar assisted heat pump system, working with a hydrocarbon mixture (HCM) of R290/R1270, 70:30 (by mass ratio) was investigated. The experiments were carried out at a metrological condition existing near Calicut, India. The experimental system mainly consists of a compressor, condenser, thermostatic expansion valve and evaporator collector. A system simulation technique was used for modelling the system. The experimental results obtained are compared with simulation output of the system working with R22 and a mixture of R290/R1270. The selected alternative working fluid mixture showed better energy performance ratio about 5.8% higher. The parametric analysis of the system working with R22 and a mixture of R290/R1270 is investigated with the help of an established system simulation model. The effect of an evaporator (solar collector) area and solar insolation are found to be the significant influencing parameters on the system performance. Moreover, the new hydrocarbon mixture is found to be a good energy efficient and environmental friendly working fluid to phase out R22 in the solar assisted heat pump systems.