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An Effects of a Suction Line Heat Exchanger on Refrigeration Cycle Performance
Debasish Sarker,Dae Yong,JiHwan Jeong 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Most modern refrigerators incorporate heat transfer between the refrigerant in a capillary tube and the refrigerant in a suction line. This heat transfer is achieved by a non-adiabatic capillary tube called a capillary tube-suction line heat exchanger and is supposed to improve the performance of the small vapor compression refrigeration cycle by removing some enthalpy of the refrigerant at the evaporator entrance. In order to investigate the effects of this heat transfer on the refrigeration cycle, a computer program was developed based on conservation equations of mass, momentum, and energy. The non-adiabatic capillary tube model is based on a homogeneous two-phase flow model. The simulation results show that both the location and length of the heat exchange section influence the coefficient of performance (COP) as well as the cooling capacity. It is noteworthy that the influence was not monotonous; that is, the performance may be deteriorated under certain conditions.
DEBASISH SARKER,LYUN-SU KIM,KI-DONG SON,정지환,장근선 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.2
Capillary tubes are widely used as a refrigerant flow control device in small refrigeration systems. Since the flow behavior inside the capillary tube is complex, many physical models are necessary to predict the characteristics of the refrigerant flow in a capillary tube. In the present paper, refrigerant flow characteristics inside the capillary tube have been studied to find out recommended empirical correlations of influential parameters. A numerical capillary model is developed to predict the refrigerant characteristics. Various empirical correlations regarding single-phase friction factor, two-phase viscosity, two-phase frictional multiplier and metastable flow are examined using this numerical capillary model. Calculated results are compared with experimental data to examine the accuracy in terms of required capillary tube length and mass flow rate. Based on the comparison, recommended correlations are selected to be used for capillary flow analysis.
Sarker, Debasish,Kim, Lyun-Su,Son, Ki-Dong,Jeong, Ji-Hwan,Chang, Keun-Sun The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.2
Capillary tubes are widely used as a refrigerant flow control device in small refrigeration systems. Since the flow behavior inside the capillary tube is complex, many physical models are necessary to predict the characteristics of the refrigerant flow in a capillary tube. In the present paper, refrigerant flow characteristics inside the capillary tube have been studied to find out recommended empirical correlations of influential parameters. A numerical capillary model is developed to predict the refrigerant characteristics. Various empirical correlations regarding single-phase friction factor, two-phase viscosity, two-phase frictional multiplier and metastable flow are examined using this numerical capillary model. Calculated results are compared with experimental data to examine the accuracy in terms of required capillary tube length and mass flow rate. Based on the comparison, recommended correlations are selected to be used for capillary flow analysis.
정지환,Sang-Goo Park,Debasish Sarker,Keun Sun Chang 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.4
Most modern refrigerators incorporate heat transfer between the refrigerant in a capillary tube and the refrigerant in a suction line. This heat transfer is achieved by a non-adiabatic capillary tube called a capillary tube-suction line heat exchanger and is supposed to improve the performance of the small vapor compression refrigeration cycle by removing some enthalpy of the refrigerant at the evaporator entrance. To investigate the effects of this heat transfer on the refrigeration cycle, a computer program was developed based on conservation equations of mass, momentum, and energy. The non-adiabatic capillary tube model is based on a homogeneous two-phase flow model. The simulation results show that both the location and length of the heat exchange section influence the coefficient of performance (COP) as well as the cooling capacity. It is noteworthy that the influence was not monotonic; that is, the performance may be deteriorated under certain conditions.
이대용(Dae Yong Yi),Debasish Sarker,정지환(Ji Hawn Jeong) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This Paper presents experimental and CFD analysis of conductive thermal resistance of capillary tube-suction line heat exchanger(SLHX). Distilled water was circulated through a SLHX and heat transfer occurs due to temperature difference between the capillary tube-side and the suction line-side. The convective thermal resistances of both sides are subtracted experimental results show that the conductive thermal resistance reaches about 1.5% of total thermal resistance without mass flow rate.
이대용(Dae Yong Yi),Debasish Sarker,정지환(Ji Hawn Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
This paper presents experimental analysis of conductive thermal resistance of capillary tube-suction line heat exchanger or SLHX. Distilled water was circulated through a SLHX and heat transfer occurs due to temperature difference between the capillary tube-side and the suction line-side. The convective thermal resistances of both sides are subtracted from the total thermal resistance to get the conductive thermal resistance of the 3type of the SLHX. The results show that the conductive thermal resistance reaches about 1.5%, 53%, 8.5% of the total thermal resistance.