Condenser Outlet Research Articles

Thermodynamic analysis on a modified auto-cascade refrigeration cycle with a self-recuperator

This paper proposes a modified auto-cascade refrigeration cycle (MARC) with a self-recuperator. The introduced self-recuperator and associated expansion valve effectively increases the refrigerant enriched with more low-boiling component in the evaporator. This case could improve the cycle performance by further choosing appropriate design-dependent cycle parameters. The energy and exergy analysis methods are used to compare and evaluate the performance of MARC with conventional auto-cascade refrigeration cycle (CARC). The simulation results show that under all given working conditions, the COP and exergy efficiency of MARC are superior to those of CARC. Among R290/R170 and R600a/R1150, R600a/R1150 is much better refrigerant mixture. Under a typical working condition, the COP of MARC using R600a/R1150 is 68.17% higher than that using R290/R170. The performance improvement of MARC is more obvious when R600a/R1150 is used. Under the typical working condition, the COP of MARC is increased by 6.24% and 24.17% using R290/R170 and R600a/R1150, respectively. When initial mass fraction of R1150 is about 0.6, the two cycles have maximum COP and exergy efficiency, and the maximum COP of MARC is 24.26% higher than that of CARC. In addition, the increase in the two-phase flow vapor quality at the condenser outlet can improve the COP, but reduce the refrigeration capacity. The COP of MARC increases by 37.56% when the quality increases from 0.4 to 0.6. It is also found for MARC that COP and refrigeration capacity are positively correlated with intermediate pressure.

Investigation on the performance enhancement of electric vehicle thermal management system utilizing floating loop with finite heat exchanger size

This study suggests an electric vehicle heat pump and thermal management system employing a floating loop. The floating loop manages the thermal state of power electronics and electric motors by utilizing the liquid refrigerant at the condenser outlet. This loop recovers the waste heat generated by power electronics and electric motors in winter and enhances the cooling performance in summer through the superior cooling performance of evaporative heat transfer. Configurations of heat pump and thermal management system are presented with operating schematic in summer and winter. To verify the performance of the suggested system, the heat pump and thermal management system model is established based on experimentally validated heat pump component models and electric device models. Heat exchangers are reallocated within a finite volume to investigate the effect of thermal load shift from the coolant to the refrigerant. The result shows that the heat pump system utilizing a floating loop with the largest refrigerant heat exchanger can save power consumptions in winter up to 27.7% and 5.8% in summer while maintaining the thermal state of electric devices within the appropriate range.

Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers

Heat pump drying systems require a method to change the inflow air temperature of the drying chamber. Pulse-widthmodulation (PWM) technique with duty cycle provides a measure of controlling the voltage supplied to the electric motors. Therefore, we conducted this research to PWM control a heat pump dryer to change the air circuit parameters. In the Parallel-Flow condensers, inlet and outlet temperatures, and relative humidity, data were collected, and the average temperature values were recorded. The duty cycle was changed by developing a program using the Python programming language. An Excel-based psychrometric calculator was developed to analyze the collected data. The average condenser outlet temperatures were 56.6±0.1℃, 54.9±0.1℃, and 52.6±0.1℃, and the average condenser inlet temperatures were 43.2±0.0℃, 42.8±0.1℃, and 41.2±0.1℃ for 60%, 80%, and 100% duty cycles, respectively. The power consumption rate of the condenser reduced with an increasing duty cycle. The results concluded that the PWM control system is a viable method to control the inflow air temperature to the drying chamber.

Optimization and simulation of refinery vacuum column with an overhead condenser

Production of clean energy is the major concern for several process industries in recent times such as oil, gas, and petrochemical, however prices are persisted to rise and the optimization of energy in the process industries are keen important. The convectional methods such as distillation column with high energy consumption have been used to convert value added products from crude. Due to frequently uses of the distillation, it is recommended that it should be optimized and utilized efficiently. For the better utilization, it is required to alter the convectional methodology. The new changes can reduce the energy utilization and improve some of consumed energy. In the present paper, investigation on the energy optimization in overhead condenser of a vacuum column of petroleum using cooled water Using Chemcad 5.1 software has been studied. For energy optimization, feed temperature was altered to a suitable temperature (25 °C, 15 °C and 5 °C) for condensation of overhead steam distillation. It is expected that the quality of the hydrocarbon vapors in the overhead condenser outlet would reduce; thereby decreasing the load on the ejector. As per the principle of ejector operation, this would decrease the vacuum column pressure. With reduction in the column pressure, it is expected to introduce the feed at a lower temperature and still operate the column at the same efficiency. It will lower down the burden of energy requirements. This implies reduction in the refinery operating cost. In the next step, the comparison of the three cases, and finally evaluating the overall energy economics were carried out. The main feed was used as a cold fluid in the heat exchanger before the transfer to the main condenser. The result of this study shows that, 1.2532 E+10 cal/hr of energy was required using inleat water temperature of 50 °C in overhead condenser.

Performance modelling and optimization of three vacuum-enhanced membrane distillation modules for upscaled solar seawater desalination

Membrane distillation using multi-envelope modules in vacuum enhanced air gap (V-AGMD) operation has been demonstrated as the best alternative to the current thermal desalination technologies. This work presents for the first time the use of response surface methodology (RSM) to model and validate the performance of V–AGMD operation for seawater desalination in three multi-envelope modules with different internal designs. Permeate productivity (PFlux) and condenser outlet temperature (TCO) were modelled and validated from results obtained in steady-state experiments, considering the evaporator inlet temperature, the condenser inlet temperature, and the feed flow rate as inputs. To gain accuracy in the estimations of thermal efficiency regarding previous works, a novel strategy was applied, consisting in calculating the specific thermal energy consumption (STEC) using the models of PFlux and TCO, developed from direct measurements. The models of the three modules were used to search the optimal operating conditions that minimize the levelized cost of water (LCOW) in a large-scale MD plant under different scenarios. Different costs of thermal and electrical energy were considered and their influence on the number of modules required in the facility was also discussed.

Experimental Investigation of a Novel Extracting Water System from Air by Soil Cold Source

The distribution of fresh water resources is extremely uneven at home and abroad, and the air contains a large amount of water vapor that can be used, so air water has been a widespread concern. Air condensation method is simple and efficient and has strong water intake capacity, but it often needs to consume huge energy. Therefore, this work proposes a new simple and innovative method of drawing water from the air, based on extracting water from air process achieved by using the soil as the cold source. The new type of ground cold air water intake system is designed by the new innovative method, which uses the soil with constant temperature as the cold source to reduce energy consumption. By comparing the central composite design experiment with the field experiment and analyzing the condensate water and outlet temperature under different wind speed and humidity conditions, the quadratic equation expression of condensate water and outlet temperature is obtained, and the optimal import wind speed range under a certain humidity range is obtained according to the mathematical model. The experimental results show that the heat transfer effect between air and soil is ideal, the water intake can reach 2.2 kg in 20-hour continuous collection experiment, the air temperature is close to the soil temperature after cooling, and the effect of water intake is good, which confirms the feasibility of soil as a cold source of air condensation.

Design and experimental validation of a new condenser of an automotive air conditioning unit to address non-uniform air velocity distributions

• The front anti-collision beam in a car leads to air maldistribution. • A six-path condenser is an optimization of the traditional four-path condenser. • The new condenser shows better capacity with the anti-collision beam. • The cooling performance of automobile air conditioning system is improved. To improve the efficiency of automobile air conditioning and reduce the impact of non-uniform air velocity distributions caused by the front anti-collision beam on automobiles, we designed a new six-process condenser and tested it under different working conditions. A baffle was positioned to simulate the anti-collision beam during the experiment. We analyzed the condenser by itself and the system level performance of this newly designed condenser under three working conditions compared to a traditional four-process condenser. Condenser heat exchange capacity, condenser inlet pressure, system refrigerant flow rate, refrigerant flow resistance, thermal imaging of condenser outlet air, overall system cooling capacity, and coefficient of performance were compared. The coefficient of performance of the system with this new condenser improved by 8.5%, 7.8%, and 10.3% for the three tested working conditions.

Assessment and working fluid comparison of steam Rankine cycle -Organic Rankine cycle combined system for severe cold territories

In this work, organic Rankine cycle (ORC) is employed to expand the available temperature region of the conventional steam Rankine cycle (SRC) in severe cold territories. The feasibility of the proposed steam Rankine cycle -Organic Rankine cycle combined system is investigated and verified. Working fluids are compared and screened, the matching scheme of different working fluids suitable for different working conditions and objects (thermodynamic or economic performance) are obtained. The results show that the net power increment (NPI) of the combined system increases with the decrease of the condenser outlet temperature (CT). The NPI of ORC system can be effectively improved by adding a regenerator. For wet working fluids, when the evaporating pressure of ORC system is close to the critical pressure of working fluid, there exists an optimal superheat degree with maximum NPI of the system. The combined system using ammonia and R600 as working fluid has the largest NPI values. When the CT of SRC is higher than 90 °C, the Rankine cycle using ammonia as working fluid has better performance. When the CT of SRC is less than 90 °C, the regenerative ORC system using R600 as working fluid has a better performance.

Study of Thermal Performance of Closed Loop Pulsating Heat Pipe using Computational Fluid Dynamics

Abstract: Pulsating heat pipe is a heat transfer device which works on two principles that is phase transition and thermal conductivity which transfer heat effectively at different temperatures. Different factors affect the thermal performance of pulsating heat pipe. So, various researchers tried to enhance thermal conductivity by changing parameters such as working fluids, filling ratio, etc. Analysis of heat transfer characteristics of closed loop pulsating heat pipe (CLPHP) is to be carried out by using Computational Fluid Dynamics. The CLPHP is to be modelled on ANSYS Workbench, the flow of CLPHP is to be observed under specific boundary conditions by using ANSYS Fluent software. Acetone and Water are taken as the working fluid with 70% filling ratio at ambient temperature 30° C and the heat flux of 200 W is supplied at evaporator. Also, the analysis has been done to know the behaviour of PHPs under varying supply of heat flux at evaporator (inlet), the output heat flux is obtained at condenser (outlet) and find out how the heat flux is varying at different temperatures. CFD results shows the heat transfer characteristics observing the performance of CLPHP is a numerical manner. The obtained CFD results are compared with the experimental. The outputs of the simulations are plotted in graphs and outlines. Keywords: Closed Loop Pulsating Heat Pipe, CFD, Heat Transfer, ANSYS.

Evaluation of flow and heat transfer in the condensation of R-406a vapor in circular tubes with extended surface of twisted fins

The present study aimed to conduct an experimental examination of heat transfer increase using tubes with extended surface of twisted fins for the condensation of vapor R-406A in horizontal tubes. The experimental setup comprised a main counter flow double-tube condenser, with water as the cooling fluid. Further, test and secondary condensers were used to reach desired vapor qualities. The tests were conducted on a smooth tube and four different tubes with extended surface of twisted fins and collected for different mass flow rate of refrigerant and in each mass flow rate for six different vapor quality. The refrigerant mass flow, temperature of refrigerant inlet water and condenser outlet water, were measured in each test. Also, the heat transfer coefficients were obtained based on the former data for different states. The results show that for the tubes with extended surface of fins, heat transfer enhanced by decreasing the pitch. The use of tubes with extended surface of fins increased the mean heat transfer coefficient by about 47% compared to the smooth tube. Eventually, a new correlation is defined for examination of the condensation heat transfer coefficient of R-406A in circular tubes with extended surface of twisted fins.

Influence of internal heat exchanger position on the performance of ejector-enhanced auto-cascade refrigeration cycle for the low-temperature freezer

This paper presents a thermodynamic investigation on the configuration optimization of the ejector-enhanced auto-cascade refrigeration cycles for −80 °C freezers. The performance comparisons based on the genetic algorithm are carried out among four different modified cycles with differently positioned IHX. The natural binary mixture R1150/R600a is used as the working fluid. The simulation results illustrate that adding IHX could improve the overall system performance, and adopting IHX at the evaporator outlet is more effective for performance enhancement than that at the condenser outlet. The most significant performance improvements are obtained in the optimized cycle, which simultaneously adopts the dual-IHX at the condenser and evaporator outlets. Compared to the cycle withnot IHX, the average COP and exergy efficiency improvements reach up to 55.2%, and the compressor displacement and system initial capital cost are reduced by 52.9% and 17.5%, respectively. The pressure lift ratio increases, and the entrainment ratio declines due to the application of the IHX at the condenser outlet. Theoretical results provide a guide for improving the ejector-enhanced ultra-low temperature freezer in the applications of the −80 °C freezing.

Assumption-free modeling of a micro-scale organic Rankine cycle system based on a mass-sensitive method

Organic Rankine cycle (ORC) systems are one of the most suitable technologies to produce electricity from low-temperature sources. In this paper, the main components of a non-regenerative, micro-scale ORC unit are modeled using the experimental results. These components are then used as functions in the system-level solver developed in MATLAB© to predict the performances of the system at off-design conditions. The proposed system solver is based on a novel approach, in which no assumptions are made about the system’s state, and only the components’ specifications and the real system boundaries that an operator encounters are adopted as inputs. To this end, the conservation of mass is considered in addition to the conservation of energy in the modeling of the system.Using the assumption-free model, the performances of the ORC system are mapped in the range of the experimental data considering the pump and the expander speeds as variables. The results show that the optimum system net electric performance is achieved at the pump and the expander speeds of 400 rpm and 900 rpm approximately. However, the pump is prone to the risk of cavitation due to low subcooling at the condenser outlet at this condition. Moreover, zero superheating is calculated at the expander suction that is not recommended for its operation.Hence, the developed assumption-free, object-oriented, mass-sensitive model has led to the full understanding of the system limitations and losses in the case of waste heat recovery applications. The proposed approach could be extended also to other ORC systems thus mapping their performances at off-design conditions without making artificial assumptions.

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Evaporative Cooling for Polymer Electrolyte Fuel Cells – a Model Based System Level Analysis

Polymer electrolyte fuel cells (PEFC) are a promising alternative to conventional propulsion systems since they reach peak system efficiencies above 60 % [1] and power densities of more than 640 W/L [2]. State-of-the-art PEFC system power densities are almost in accordance with U.S. Department of Energy 2020 targets (650 W/L), however, to reach the ultimate target of 850 W/L, a substantial decrease in system volume is required [3].In a conventional PEFC, the cooling system contributes significantly to stack and system volume. The state-of-the-art cooling solution aims at transferring the waste heat to a liquid coolant that flows through separate cooling channels in the bipolar plates. Therefore, a complex multi-layer design of bipolar plates is required [4] which contributes to about 75 % of stack volume and approximately 80 % of its mass [5]. The coolant is subsequently chilled in an external heat exchanger which requires a high surface area due to the small temperature gradient and thus shows a high volume demand.In order to facilitate the heat transfer, high stack operating temperatures are necessary. However, to ensure a proper humidification and thus ionic conductivity of the proton exchange membrane [6] at elevated temperatures, an external humidifier is often required which contributes substantially to the system volume.As an auspicious alternative, evaporative cooling can contribute to reach the ultimate power density target, since it shows the potential to reduce the stack volume, mass, complexity and cost up to 30 % by simplifying the design of bipolar plates [7]. Additionally, it allows a better internal humidification which enables higher operating temperatures without an external humidifier.In our concept, liquid water is fed to each cell through dedicated water channels in the anode flow-field. Subsequently, the water is distributed in a specially designed gas diffusion layer with a mixed hydrophilic and hydrophobic pattern (Figure 1) [8]. Once in contact with the gas flow, the water in the hydrophilic lines evaporates, cools the cell by taking up the heat of evaporation and is eventually released as vapor with the exhaust gases.Our previous work [9] has proven, that sufficient cooling power can be provided by evaporative cooling. Main findings showed, that the evaporation rate and thus the cooling power increases with temperature as well as cathode stoichiometry and decreases with system pressure (Figure 2). On the other hand, operating conditions show a significant impact on stack performance and power consumption of balance of plant (BoP).Therefore, a zero-dimensional fuel cell system model has been developed in the present work to analyze interactions between BoP and the fuel cell stack in an evaporatively cooled system. From the analysis of the power demand of the air compressor and the stack power, optimal operating conditions are elaborated in order to maximize the net system power. Simulation results show that the temperature has only limited impact at low current densities, whereas the peak system power decreases with temperature. Acomparison between conventional and evaporative cooling shows no significant performance difference at 70 °C but a slight decrease in peak power for evaporative cooling at 90 °C. However, since the heat rejection of conventional cooling systems is typically limited to about 1.45 kW/K [3], evaporative cooling shows the additional benefit of an increased peak power (Figure 3).In addition, a system efficiency map for evaporative cooling has been calculated (Figure 4) which shows that the highest efficiencies can be reached at low pressure (1 to 1.5 bar), medium to high temperature (70 °C to 90 °C) and low cathode stoichiometry (2 to 3), similar to a conventionally cooled system.Further, the water balance of an evaporatively cooled fuel cell system has been investigated and main findings show, that a sufficient amount of water can be retained from the exhaust gas at condenser outlet temperatures below 60 °C to supply sufficient water to the stack.

An extensive thermo-economic evaluation and optimization of an integrated system empowered by solar-wind-ocean energy converter for electricity generation – Case study: Bandar Abas, Iran

In parallel with efforts to shift human societies' reliance from fossil fuel to renewable resources, in this paper, three green-based energy generation configurations were proposed and examined thermoeconomically. Afterwards, the one with the highest performance was selected for further investigation. The chosen system was empowered by an ocean thermal energy convertor (OTEC), a wind turbine, and a solar flat plate panel. The system was modeled by Engineering Equation Solver (EES) software to conduct sensitivity analysis by assessing the impact of changes in objective parameters on the net power output, thermoelectric generator (TEG) power output, exergy efficiency, and cost ratio. In the following steps, EES was coupled with MATLAB through Dynamic Data Exchange (DDE), and a non-dominated sorting genetic algorithm (NSGA-II) was employed for optimizing design parameters including solar panels' area, organic Rankine cycle (ORC) turbine inlet temperature, condenser outlet temperature, ORC pump and turbine efficiency, TEG figure of merit, and evaporator pinch point to reach the highest possible exergy efficiency and the least amount for cost ratio. The system performed with 13.88% exergy efficiency. The exergy destruction analysis showed wind turbine was the most exergy destructor in the system. The configuration is able to generate 448 kW power at its optimal point. Eventually, a case study for Bandar Abbas city, a coastal town in the south of Iran, is carried out to investigate the system's performance concerning the region's potential throughout a year. The results indicate that the system can potentially supply 38 Iranian households with electricity all year-round.

ANALISIS TERJADINYA SCALING SILICA PADA CONDENSER DAN COOLING TOWER

Silica scaling in geothermal production fields can clog the fluid flow rate. Research has been conducted to determine the occurrence of scaling sillica in brine. The method used in processing this data is by using an application in the form of steam tables and Microsoft Excel. Therefore, a study of the potential for silica scaling in activities that utilize geothermal energy is needed. In this study, a study on the potential for silica scaling in a geothermal power plant in the Lahendong area unit 2 cluster 13.The purpose of this study was to estimate the possibility of scaling silica in the condenser and cooling tower in the geothermal field. After the research was carried out, it could be concluded that the results of the calculation of scaling sillica in the Lahendong geothermal field were the condenser at 11.2 ppm while cooling tower was 72.5 ppm. When silica concentration in this field is compared with the calculated silica concentration, the silica will not settle in the condenser or the cooling tower.This is because the silica concentration in the field is smaller than the calculated silica concentration, so there is no silica scaling at the inlet or outlet of condenser and cooling tower.

Subregional modulation of axial flow fans to reduce condensate supercooling of air-cooled steam condenser in cold days

For the air-cooled steam condensers (ACSCs) in the power station, the power consumption of axial flow fans accounts for a large proportion of the auxiliary power, which can be optimized by their rotational speed modulation. In this work, the subregional modulation strategies of axial flow fans in cold days are studied to reduce the supercooling of condensate in ACSCs as much as possible. For the steam-side and air-side heat transfer coupling in ACSCs, the macro heat exchanger model is adopted with the steam thermo-flow process solved, where the water phase state change is characterized by the steam enthalpy. Besides, the exhausted steam condensation in the down-flow bundles and the residual steam condensation in the up-flow bundles are both taken into consideration. Under the working conditions of choking turbine back pressure for an ideal power generating efficiency, the inlet temperature and flow rate of cooling air for each condenser cell are obtained, the condensate outlet temperature of the up-flow bundles and the total fan power consumption are calculated in terms of different modulation methods. The results show that the subregional modulation is superior to the uniform modulation with the maximum power conservation of 362.8 kW, which can be recommended in the practical operation of axial flow fans for ACSCs in winter.

Experimental evaluation on a centralized air conditioning system embedded with a split-type air conditioner as a dedicated subcooler

Dedicated subcooling (DS) is one of the alternative methods to gain significant performance improvement in the air conditioning (A/C) system. However, DS increases the investment cost and the performance improvement depends on the capacity ratio between the subcooler and the main A/C system (RSM). As compared to previous studies, the present study investigates experimentally the performance of the A/C system equipped with DS at smaller RSM, and justify the economic advantage of the proposed system. The experimental study was conducted at constant outdoor, evaporation, and condensation temperatures of 30, 5, and 40°C, respectively. The experimental facility consists of a main A/C system with a compressor capacity of 11.25 kW and R22 as a working fluid. The sub-system is a split-type A/C system with compressor capacity of 0.75 kW and R290 as a working fluid. Four parameters; the degree of subcooling, cooling capacity, input power, and coefficient of performance (COP) were investigated. The results showed that the DS decreased the condenser outlet temperature , thus led to an average increase in degree of subcooling by 3.4°C. Consequently, cooling capacity of the main system increased by 1.4 kW, and the input power of the entire system (power consumed by the main and subcooler systems) decreased by 0.4 kW. As a result, the COP raised by 7.8%, as compared to system without DS. In the economic point of view, the analysis showed that the system with DS is economically viable and has a huge potential due to short payback period of just 11.81 months. • Residential air conditioner as a sub-system in producing dedicated subcooling. • The ratio on capacities of subcooler to main system determine the degree of subcooling of the main system. • The dedicated subcooling increases the cooling capacity and decreases the input power of the main system. • The COP increases when the power used by both the main and subcooler systems are considered. • Simple payback period of 11.81 months is expected for system with DS as compared to system without DS.