Refrigerant Pressure Drop Research Articles

Numerical simulation of flow and cooling heat transfer of supercritical pressure refrigerants in chevron-type plate heat exchanger

In industrial fields, heat sources exceeding 130°C are necessitated; hence, the development of industrial high-temperature heat pump systems is anticipated. For the heat release process in such heat pump systems, the use of a plate heat exchanger (PHE), in which high-pressure working refrigerant flows, is examined. In this study, to predict the cooling heat transfer coefficient and pressure drop of supercritical pressure refrigerants flowing in a chevron-type PHE, a computational fluid dynamics model is developed. HFC134a and HFO1234ze(E) are selected as the working refrigerants. Calculations are performed by changing the inlet fluid enthalpy under three reduced pressure conditions from 1.01 to 1.21 and two mass flow rate conditions. The heat transfer coefficient and pressure drop obtained from the simulation reproduced the experimental results well, including the effects of pressure and mass velocity. Therefore, the present model can be applied to existing and new refrigerants if their physical properties are available. Furthermore, it can be used to optimize the plate shape of chevron-type PHEs. Finally, based on the simulation results, the characteristics of the flow behavior and heat transfer of refrigerants in the PHE are discussed.

Condensation heat transfer and pressure drop of low GWP R-404A alternative refrigerants (R-448A, R-449A, R-455A, R-454C) in a 5.6 mm inner diameter horizontal smooth tube

The literature survey reveals that condensation or evaporation study of R-404A alternative refrigerants are lacking. In this study, four R-404A alternative refrigerants - two short term refrigerants (GWP100≤2500: R-448A, R-449A) and two long term refrigerants (GWP100≤150: R-455A, R-454C) - including R-404A (GWP100 = 3922) were tested under condensation condition. Test range included mass flux from 80 to 400 kg m−2s−1, vapour quality from 0.2 to 0.8. Test tube had 5.6 mm inne diameter. Results showed that, at a low mass flux, heat transfer coefficients of the alternative refrigerants were approximately the same as those of R-404A. On the other hand, at a high mass flux of 400 kg m−2s−1, heat transfer coefficients of the alternative refrigerants were higher than those of R-404A. The reason was attributed to the balance of superior thermal properties, which were beneficial, and larger temperature glide, which were malign, of the alternative refrigerants compared with those of R-404A. Pressure drops of alternative refrigerants were larger than those of R-404A. Furthermore, long term refrigerants (R-454C, R-455A) yielded larger pressure drops than short term refrigerants (R-448A, R-449A), probably due to the influence of vapour density. Furthermore, data are compared with predictions by existing correlations.

Condensation heat transfer and pressure drop of low GWP R-404A alternative refrigerants in a multiport tube

The literature survey reveals that condensation or evaporation studies on R-404A alternative refrigerants are very limited. Especially for the multiport tube, no prior investigation exists. In this study, four R-404A alternative refrigerants (GWP100≤2500: R-448A, R-449A and GWP100≤150: R-455A, R-454C) - including R-404A (GWP100 = 3922) were tested in a multiport tube having 0.80 mm hydraulic diameter. The tests were conducted changing the mass flux from 380 to 760 kg/m2s, vapor quality from 0.2 to 0.8. During the tests, the saturation temperature and the heat flux were maintained at 45 °C and at 6 kW/m2. The results showed that the heat transfer coefficients of the alternative refrigerants were higher than those of R-404A. The reason was attributed to the better thermo-physical properties of the alternative refrigerants. Especially, at a high mass flux of this study, the gas core and the liquid film became turbulent, which mitigated the malign effect of temperature glide by strong mixing. Hence, the alternative refrigerants yielded higher heat transfer coefficients than R-404A. Some correlations with mixture correction predicted the heat transfer coefficient reasonably well with RMSE of approximately 0.20. An interesting finding is that even better predictions (RMSE of 0.13) were obtained when the correlation was not mixture corrected. The pressure drops were generally in the reverse order to the value of vapor density. Pressure drops of alternative refrigerants were larger than those of R-404A. The pressure drop correlations generally underpredicted the data.

Pressure Drop of a Refrigerant Flowing Vertically Upward and Downward in Small Circular, Rectangular, and Triangular Tubes

In the present study, experiments were performed to examine the characteristics of the two-phase frictional pressure drop of an R410A refrigerant flowing vertically upward and downward for the development of a high-performance heat exchanger using small tubes or mini-channels for air-conditioning systems. The cross-sections of copper test tubes were 0.5, 0.7, 1.0, 1.5, and 2.0 mm circular tubes, and rectangular and triangular tubes with hydraulic diameters of 1.04 and 0.88 mm, respectively. The frictional pressure drops were measured in the range of mass fluxes of 30–400 kg·m−2·s−1, with qualities from 0.05 to 0.9 and a saturation temperature of 10 °C. The characteristics of the measured pressure drops were compared in different inner diameters, cross-section shapes, and flow directions. In addition, Chisholm’s parameter and various modified Chisholm’s parameters for small tubes were examined to determine whether or not they reproduced our measurement data.

Retarding frosting of an air source heat pump by using vapor-bypassed evaporation technique

• Vapor-bypassed evaporation is firstly used to retard frosting for ASHP applications. • A tested ASHP system that contains two operation modes is established. • Frosting characteristics of the two operation modes are investigated in detail. • Vapor-bypassed evaporation is more suitable for high heating capacity conditions. This paper presents a comparative experimental study on the frosting characteristics of an air source heat pump system that contains two operation modes, i.e., the vapor-bypassed evaporation (VB) mode and the conventional operation (CO) mode. For VB mode, a phase separator is installed inside the evaporator refrigerant circuit to bypass vapor refrigerant, which can increase the average evaporation temperature for retarding frosting by reducing refrigerant pressure drop and decreasing the area of refrigerant inferior heat transfer coefficient region (mist flow region). According to the experimental results, under H2 condition (indoor: 20/15 °C; outdoor: 2/1 °C), as the initial refrigerant mass flow rate ranges 35–45 g / s , the VB mode yields 4.30–7.06% lower frost mass, 3.9–7.3% higher average heating capacity and 6.4–10.8% higher coefficient of performance (COP) over CO mode with the frosting duration of 60 min. Moreover, under H3 condition (indoor: 20/15 °C; outdoor: -7/-8 °C), the frosting duration is set as 100 min, and the VB mode obtains 9.67% lower frost mass, 7.0% higher average heating capacity and 13.3% higher COP over CO mode. Generally, the vapor-bypassed evaporation technique has a great application potential in retarding frosting and improving performance of an air source heat pump system especially under high heating capacity or low ambient temperature conditions.

An Experimental Investigation on R134a Evaporation inside an Internally Discrete Inclined Grooved Tube

In this experimental study, heat transfer and pressure drop characteristics of R134a evaporating flow are investigated inside a horizontal internally grooved tube with discrete inclined grooves. The test evaporators are made of smooth and grooved copper tubes of 20 mm inner diameter. The length, width, and depth of grooves are 6, 2, and 0.5 mm, respectively, and the angle of the grooves with the tube centerline is 30°. The test conditions include mass flux in the range of 16.5 to 105 kg/m2s, vapor quality of 0.06 to 0.98, and heat flux of 3.5 to 25 kW/m2. The experiment results show that the boiling heat transfer coefficient of R134a in the grooved tube is 1.25 to 1.65 times higher than that of the smooth one. The frictional pressure drop of R134a inside the grooved tube is 10% to 60% higher than the smooth tube. Moreover, by increasing mass flux, the heat transfer coefficient, and frictional pressure drop of R134a refrigerant inside horizontal smooth and grooved tubes increase as well. In conclusion, the energy performance of R134a evaporating flow inside the grooved tube is more efficient than that in the smooth tube regarding energy saving in most experiments.

Simulation study on the performance of a vapor-bypassed evaporator for heat pump applications

• A mathematical model for the vapor-bypassed evaporator is developed. • Corresponding experiments were conducted to validate the model accuracy. • Entropy generation is applied to evaluate the evaporator overall performance. • Phase separation position and channel number of the evaporator are optimized. This paper presents a simulation study on the vapor-bypassed evaporator for heat pump applications. The vapor-bypassed evaporator, in which a phase separator is set in the middle of the refrigerant circuit to bypass vapor refrigerant, can reduce the refrigerant pressure drop for enhancing the evaporator overall performance. A mathematical model for the vapor-bypassed evaporator is developed and the experiments were conducted to validate its accuracy. Based on the entropy generation minimization theory, the optimum phase separation positions and refrigerant channel numbers of the evaporator for various operation conditions are selected out. According to the simulation results, as the required heat transfer capacity ranges 4~10 kW, the vapor-bypassed (VB) mode obtains 25.6~84.6 kPa lower refrigerant pressure drop and 3.1~25.3% lower entropy generation than the conventional operation (CO) mode. Moreover, when the ambient temperature ranges 5~15°C, the entropy generation of VB mode is decrease by 22.3~11.5% than CO mode. In general, applying the vapor-bypassed technique is a promising way for improving the evaporator performance especially under high heat transfer capacity and low ambient temperature conditions.

Machine learning approach for predicting refrigerant two-phase pressure drop inside Brazed Plate Heat Exchangers (BPHE)

This paper presents a Gradient Boosting Machines (GBM) model for predicting refrigerant two-phase frictional pressure gradient inside Brazed Plate Heat Exchangers (BPHE) based on an extensive database that includes 1624 boiling data-points, 925 condensation data-points, 16 different plate geometries, and 16 different refrigerants (including 4 natural refrigerants and 6 other low-GWP refrigerants). The model accounts for the effect of plate geometry, operating conditions and refrigerant properties. The model is able to reproduce the whole database with a Mean Absolute Percentage Error (MAPE) of 6.6%. The GBM model exhibits a better predictive performance than the state-of-the-art analytical-computational procedures for two-phase pressure drop inside BPHE available in the open literature. The characteristic parameters of the GBM model are thoroughly reported in the paper.

Universal Electric Vehicle Thermal Management System

<div class="section abstract"><div class="htmlview paragraph">As the demand for Electric Vehicles (EVs) is increasing to limit global warming, observation shows that the significant application of EV is in cold and mild climate regions. Heat pump and CO2 system are two major Thermal Management Systems (TMS) used in these EVs. These TMS are constrained to cold climate applications securing better COP for heating function but sacrificing cooling COP when the same TMS applied to hot climate regions. This study presents a new Electric Vehicle Thermal Management System (EVTMS) limited to active liquid battery cooling for the application of Electric Vehicles in hot climate regions. The proposed system has integrated Battery Thermal Management System and Cabin HVAC using a shared electric compressor. This integrated solution also utilizes waste heat recovery to contribute for better system COP when compared to conventional TMS used for EV's. The decrease in the number of pipes and switching valves due to integrated solution also results in low refrigerant pressure drop preventing penalty on compressor duty. Battery cells target temperature of 27°C and, temperature delta of 4°C across battery cells is also considered as a prime motive during this study. Different strategies to control battery cells target temperature; the cabin HVAC system is studied. System simulation for typical thermal load in an EV is the first objective. The benefits of the proposed system are validated using an experimental test at a typical load condition. COP comparison for an existing system with proposed EVTMS proves the proposed system to be 50% energy efficient under typical thermal load from battery and cabin.</div></div>

Condensation heat transfer and pressure drop of low-pressure hydrocarbons and synthetic refrigerants

Synthetic refrigerant R-245fa is an alternative to R-134a in HVAC systems and is being considered for use in Organic Rankine Cycles (ORCs) for power generation from low-grade heat sources. Pentane, in combination with R245fa, is being considered for use in geothermal heat generation. An experimental investigation of condensation heat transfer and frictional pressure drop for pure R-245fa and pentane flowing through smooth horizontal tubes with internal diameters of 7.75 mm and 14.45 mm was conducted. These measurements were made over mass fluxes ranging from 100 to 600 kg m−2 s−1, operating pressures from 122 to 610 kPa, and nominal vapor qualities ranging from 0.05 to 0.95. Results from this experimental study are compared with predictions from correlations in the literature, and agreement and differences are interpreted and discussed. The measured frictional pressure drops ranged from 0.25 to 100 kPa m−1, and heat transfer coefficients from 1.5 to 15 kW m−2 K−1 were observed. Heat transfer and pressure drop models that apply specifically to these low pressure fluids, tube diameters, and operating conditions are developed. These models provide significant statistical improvements in the predictions of the heat transfer coefficient and pressure drop over existing correlations.

Experimental study of heat transfer coefficient, pressure drop and flow pattern of R1234yf condensing flow in inclined plain tubes

The purpose of the present study is to investigate the condensation heat transfer coefficient, pressure drop and flow pattern characteristics of R1234yf refrigerant in an inclined plain tube with an internal diameter of 8.3 mm. Experiments are conducted at four mass fluxes of 80, 160, 240 and 320 kg/m2s, mean vapor qualities in the range of 0.12 to 0.75, saturation temperature of 25 °C, and for tubes with inclination angles in the range of -90° (vertically downwards) to +90° (vertically upwards). The effects of different parameters such as mass flux, mean vapor quality, and the inclination angle of the tube on flow pattern, condensation heat transfer coefficient, and pressure drop are investigated. According to the results, it is found that inclination angle significantly influenced the flow pattern. Furthermore, it is observed that generally, increasing vapor quality and mass flux, enhances the heat transfer coefficient for all the inclination angles. At low mass fluxes or low vapor qualities, the highest heat transfer coefficient occurs in the tube with the inclination angle of -30°, while at higher mass fluxes or higher vapor qualities, the effect of inclination angle on heat transfer is negligible. With increasing the vapor quality, total pressure drop increases for tubes with the negative or zero angles, while it generally decreases, for the tubes with positive angles. In addition, total pressure drop increases with increasing mass flux at constant vapor quality for all the inclination angles. Experimental results of this study are also compared with the existing correlations in literature that predict the amount of heat transfer coefficient and frictional pressure drop. Finally, based on the present data, a new correlation is developed and suggested to predict the flow condensation heat transfer coefficient in inclined plain tubes.

Effect of pipes in heat pump system on electric vehicle energy saving

ABSTRACT Refrigerant pressure drop and temperature change in pipes are normally ignored in the thermodynamic analysis of traditional vehicle air conditioning system, this will result in serious errors. In this Paper, pressure drop and temperature difference are simulated in different pipes of electric vehicle (EV) heat pump system to analysis the effects of pipes in the actual EV heat pump system. The results indicate that the greater the mass flow, the faster pressure drop increases, the temperature difference decreases. Pressure drop of saturated liquid refrigerant is smaller than that of saturated gas refrigerant at the same saturation pressure and mass flow rate. The higher the refrigerant pressure (no phase change), the slower pressure drop decreases, the faster the temperature difference decreases. Pressure drop decreases with the increment of bending angle of the pipe. For EV heat pump system, suitable valves and less branches are helpful for energy saving of the system. Shortening the pipe between compressor and condenser can reduce temperature change obviously. Pressure drop per unit length in the pipe between evaporator and compressor is large especially in heating mode because of lower refrigerant density. It even reaches to over 100 times of that in the pipe between condenser and throttle valve in heating mode and has negative effects on the performance of the system. If the evaporator is closer to the compressor and the number of branches is less, then pressure drop will decrease a lot, which will be advantageous for energy saving of the heat pump system.

Computational modeling and prediction of the performance of air source heat pumps under frost prevention and retardation conditions

Frost formation is commonly occurred in the air source heat pumps (ASHPs) at cold-moist regions in winter conditions. Reducing energy consumption of ASHP systems is very important for improvement of building energy efficiency. This paper introduces a computational model of an existed modified ASHP equipped with auxiliary electric heaters (AEH) located between capillary and evaporator (B-AEH). It is aiming for frost prevention and retardation, and improvement of the performance of the ASHPs in winter conditions. The model involves 3 component modules, the ambient module, the ASHPs module and the B-AEH frost prevention module, which allows both steady state and transient analyses. For the prescribed ambient conditions, the computed performance values overestimated the COP in the average by 2.91% and the heating capacity by 3.76% comparing with experimental data. Other performance parameters are also predicted with the validation model, inluding refrigerant pressure drop, heat transfer coefficient and mass flow rate of the refrigerant, wall tube temperature of the evaporator along with the vapor quality. This study offers a convenient tool for practicing engineers to allow the analysis and design of ASHPs systems for frost prevention and retardation under a wide range of operating conditions.

Design Evaluation for a Finned-Tube CO2 Gas Cooler in Residential Applications

Towards the introduction of environmentally friendlier refrigerants, CO2 cycles have gained significant attention in cooling and air conditioning systems in recent years. In this context, a design procedure for an air finned-tube CO2 gas cooler is developed. The analysis aims to evaluate the gas cooler design incorporated into a CO2 air conditioning system for residential applications. Therefore, a simulation model of the gas cooler is developed and validated experimentally by comparing its overall heat transfer coefficient. Based on the model, the evaluation of different numbers of rows, lengths, and diameters of tubes, as well as different ambient temperatures, are conducted, identifying the most suitable design in terms of pressure losses and required heat exchange area for selected operational conditions. The comparison between the model and the experimental results showed a satisfactory convergence for fan frequencies from 50 to 80 Hz. The absolute average deviations of the overall heat transfer coefficient for fan frequencies from 60 to 80 Hz were approximately 10%. With respect to the gas cooler design, a compromise between the bundle area and the refrigerant pressure drop was necessary, resulting in a 2.11 m2 bundle area and 0.23 bar refrigerant pressure drop. In addition, the analysis of the gas cooler’s performance in different ambient temperatures showed that the defined heat exchanger operates properly, compared to other potential gas cooler designs.

Thermodynamic, exergo-economic and exergo-environmental analysis of hybrid geothermal-solar power plant based on ORC cycle using emergy concept

Design and optimization of the energy system with the efficient method is one the major problem in recent years. The combined emergy-exergy-economic-environmental analysis is one of new methods selected for the optimization of energy systems. At present paper, first, optimal design of thermodynamic, exergo economic and exergo environmental was developed; the geothermal power plant was used as a complement to concentrated solar power (CSP) and then combined emergy-exergy-economic-environmental analysis was conducted. A standalone geothermal cycle (first mode), as well as hybrid Geothermal-Solar cycle (second mode) were investigated to generate the heating/cooling power of the building. The close similarity of the results of the exergy and emerge-economic analysis was very interesting. For standalone geothermal cycle, both exergo and emerge-economic analysis implied that highest value (6.02E-04 $/s and 3.1915E+09 sej/s) was related to turbine due to the heat generated by the impact of the blade, and the lowest value was related to ORC condenser. The exergo and emergo-economic analysis for geothermal-solar hybrid cycle, due to the increase in refrigerant pressure drop inside the coil, the evaporator (4.50E-03 $/s and 4.4699E+09 sej/s) and turbine (2.40E-03 $/s and 2.1920E+09 sej/s) had the highest amount. Also for standalone cycle, exergo and emergo-environmental implied that ORC turbine had the highest value of 1.26E-06 pts/s and 9.7201E+09sej/s. For hybrid geothermal-solar cycle, the evaporator (3.77E-06 pts/s and 6.1814E+08sej/s) and turbine (3.27E-06 pts/s and 6.37E+08 sej/s) had the highest amount of exergo and emergo-environmental. Solar power plants have only an initial cost and because solar energy is freely available to the system, so its economical exergy degradation is very low and has the lowest environmental exergy degradation. According to the results of the exergo-economic analysis of the hybrid power plant, the highest investment cost is related to solar power plant. It also has the lowest cost of exergy degradation because the environmental impact of fuel flow of solar panel is zero. The highest emerge-environmental rate of 3.3250E+09 (sej/s) was belonged to the solar power plant, but its environmental destruction rate was minimal because it does not consume fuel.

Evaporation heat transfer and pressure drop of low-gwp refrigerants in a horizontal tube

Pressure drop and heat transfer in evaporators have significant influence on the efficiency and capacity of vapour compression refrigeration (VCR) systems. Oil lubricant deteriorates the heat transfer and causes blockage in compact evaporators, particularly micro-channel. Experiments were carried out to investigate the evaporation heat transfer and pressure drop of R1234yf, R152a and R134a in an oil-free VCR system using a horizontal tube. The results show that R1234yf has the highest pressure drop and R152a has the highest heat transfer coefficient. Two existing correlations were improved based on experimental data to predict the Nusselt number and two-phase frictional pressure drop in evaporator for three refrigerants. The improved correlations were proposed as a function of annular diameter ratio, Reynolds number, Prandtl number, Martinelli parameter and Chisholm parameter. Overall the Mean Absolute Percentage Error for the improved correlations are lower than 16%. The present correlations can effectively be adopted for modelling VCR systems with high confidence to optimise the evaporator and predict the performance.

Experimental study on refrigerant maldistribution in a fin-and-tube evaporator for a direct expansion air-conditioning system

In this paper, the design concept of the face split evaporator with a retrofitted suction header and choked flow in the capillary tubes was adopted to improve a direct expansion air-conditioning system with a designed air flow rate of 20,000 m3/h. The novel design of the direct expansion air-conditioning system was experimentally tested and validated. Face split evaporator reduced the refrigerant pressure drop in the suction header and the choked flow design limited the maximum flow rate across each branch circuit, which both contributed to the uniform refrigerant flow distribution of the improved system. Consequently, the cooling capacity and COP of the improved system was 10.5% and 13.4% higher than the original system. With the refrigerant mass flow rate of the improved system varying from 1.33 kg/s to 2.05 kg/s, the measured cooling capacity ranged 240–350 kW and the ratio of the system COP to the ideal COP of the reversed Carnot cycle with the same evaporating and condensing temperatures maintained at 0.72–0.74. The experimental results demonstrated that the improved system performed a relatively uniform refrigerant flow distribution among the branch circuit of the evaporator regardless of the refrigerant mass flow rate. This study is beneficial to the optimization design of the multi-circuit evaporator for a direct expansion air-conditioning system with a large air flow rate in engineering applications.

Experimental study on an inverter heat pump air conditioner with a vapor-bypassed evaporator

This paper presents an experimental study on the performance of an inverter heat pump air conditioner with a vapor-bypassed evaporator. The vapor-bypassed evaporator, in which a phase separator is set in the middle of the refrigerant circuit to bypass vapor refrigerant, can reduce the refrigerant pressure drop and enhance the system overall performance. The tested heat pump system can be operated at two modes, i.e., vapor-bypassed (VB) mode and conventional heat pump (CH) mode. The testing results indicate that as the heating capacity ranges 1900–4900 W, the COP of VB mode is improved by 4.1%–11.6% over CH mode under the H1 condition (indoor: 20.0/15.0 °C; outdoor: 7.0/6.0 °C). When operated under the H2 condition (indoor: 20.0/15.0 °C; outdoor: 2.0/1.0 °C; frosting condition), the system at VB mode yields 11.2% higher average heating capacity and 4.4% higher COP over CH mode at a fixed compressor speed of 95 Hz. Generally, using the vapor-bypassed evaporator has a great potential for improving the performance of a heat pump air conditioner especially under high heating capacity conditions.

Theoretical and experimental analysis of a vertical direct expansion geothermal evaporator using CO2 as refrigerant

In direct expansion ground coupled heat pumps (DX-GCHPs), the borehole heat exchanger (BHE) plays a major role, as it is the component where heat transfer between the ground coupled heat pump (GCHP) and the soil occurs. To address the current challenges of using CO2 as refrigerant in DX-GCHP systems, theoretical and experimental investigations were performed on a single U-tube vertical direct expansion BHE using CO2 as the refrigerant. First, an experimental setup of a transcritical CO2 DX-GCHP built at CanmetENERGY laboratories was used to monitor, collect, and analyze data for refrigerant flow, pressure drop, and ground temperature along the boreholes. The CO2 evaporation process in the BHE for different mass flow rates per borehole was then experimentally analyzed. Later, a previously developed theoretical model of the BHE was validated using a set of experiments collected with the current test apparatus. Finally, the model was used for the analysis of the effect of the following parameters on the performance of the BHE: (i) the refrigerant flow rate, (ii) the borehole wall temperature and average fluid temperature over the test period during the evaporation process, (iii) the pressure drop, (iv) the required power for CO2 circulation, and (v) the evaporating temperature change in the BHE.

Design and Analysis of Air-Cooled Fin and Tube Heat Exchanger with Smaller Diameter Micro Finned Tubes using R32 in Replacement of R410A

Difluoromethane (HFC32) is the perfect replacement of R410A due to its zero ozone depletion Potential and lower Global warming potential (GWP as 675) that is much less than R410A (2088) and Zero Ozone Depletion Potential. R32 refrigerant can achieve higher heat transfer coefficients with less quantity of refrigerant charge when compared to R410A. Fin and Tube heat exchangers (FTHE) are widely used in the refrigeration, air conditioning industries and in many other applications to exchange or transfer the heat from refrigerant or working fluid and to the sink. The aim of this paper is to calculate the Heat transfer coefficient, pressure drop and heat load of refrigerants in Air-cooled Fin and Tube heat exchanger. Here FTHE is used as a condenser in one TR residential air conditioning application and their comparison using R32 and R410A refrigerants. To study the behaviour of two refrigerants in liquid phase, two phase (liquid and vapor phase) and vapor phases inside the condenser. Here the airflow to the condenser is counter flow. Materials used were Aluminium for fins and copper for tubes to achieve greater heat transfer coefficient. Here fin and tube material combination is very important because of their material properties. Optimizing the design of FTHE, i.e. selecting the micro finned tubes to generate turbulence in refrigerant flow, which results in enhancement of heat transfer coefficient. Slit type fin is selected for fins. The micro finned copper tubes with smaller inner diameter can save the material cost. Coil Designer a simulation software used for the design and analysis of FTHE.