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The conventional refrigeration ejector cycle utilizes a constant temperature process during motive heat consumption needed for vapor generation. This may be thought of as the main restriction concerning the application of low-grade heat as a motive source by these systems since it results in required significant mass flow rate with a small temperature drop of heating fluid. The first proposed novel approach is an ejector flash cycle (EFC) in which the working fluid is heated up to the saturation temperature only at the inlet to the primary nozzle of the ejector. The second possible approach is the application of a zeotropic mixture as the working fluid for the conventional ejector cycle. The performance of an EFC is compared to the ejector refrigeration cycle (ERC) working with zeotropic refrigerant. Three motive heat source temperatures (60°C, 75°C, 90°C) and two evaporation temperatures (0°C, 6°C) were tested. Eight pure low-GWP refrigerants and four low-GWP refrigerant blends were analyzed. It was demonstrated that the flash cycle can efficiently operate with low-temperature motive heat source (60°C) with refrigerants R1234yf and R1234ze(E). The highest coefficient of performance (COP) is attainable for propane with a motive source temperature of 60°C and R1234ze(Z) for the motive temperature of 75°C and 90°C. The differences of liquid pump power consumption of both discussed cycles compared to the conventional compression cycle are significant and reach up to 90 percent in the case of EFC and up to 96 percent in the case of the zeotropic cycle. The electric power savings in the case of the zeotropic cycle are slightly higher, but COP and drop of the heating water temperature are notably lower. Therefore, the EFC system is suggested to be a better solution for low-grade heat utilization in the cases when a significant decrease of the motive source fluid temperature is required.
Paweł Jakończuk; Kamil Śmierciew; Huiming Zou; Dariusz Butrymowicz; Adam Dudar. Temperature drop of heating fluid as a primary condition for effective utilization of low-grade heat using flash cycles and zeotropic mixtures in refrigeration ejector systems. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2021, 1 -19.
AMA StylePaweł Jakończuk, Kamil Śmierciew, Huiming Zou, Dariusz Butrymowicz, Adam Dudar. Temperature drop of heating fluid as a primary condition for effective utilization of low-grade heat using flash cycles and zeotropic mixtures in refrigeration ejector systems. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2021; ():1-19.
Chicago/Turabian StylePaweł Jakończuk; Kamil Śmierciew; Huiming Zou; Dariusz Butrymowicz; Adam Dudar. 2021. "Temperature drop of heating fluid as a primary condition for effective utilization of low-grade heat using flash cycles and zeotropic mixtures in refrigeration ejector systems." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects , no. : 1-19.
The one-dimensional implementation of the Delayed Equilibrium Model (DEM) is known as a relatively simple yet accurate approach for prediction of critical mass flow rate, pressure and void fraction distributions for two-phase water transonic flows in ducts of variable geometry. However, the direct application of DEM equipped with original saturation index evolution law and Lockhart-Martinelli approach (the original setup) is incapable of accurate prediction of CO2 transonic flow. Moreover, the Darcy friction factor approach has a significant impact on the simulation results. Consequently, this paper presents a new law of the saturation index evolution and a new frictional pressure gradient approach for CO2 transonic two-phase flows together with experimental validation and discussion of obtained data. A comparative analysis of the developed DEM setup and the referential Homogeneous Equilibrium Model revealed that application of the proposed approaches decreases the mean maximal discrepancy between experimental and calculated static pressure values by a factor of app. 2, with simultaneous decrease of the standard deviation by a factor of app. 4. That proves that both the frictional pressure gradient approach and the proper introduction of the thermal non-equilibrium effects are substantial for accurate modelling of the flashing process in CO2 flows.
Wojciech Angielczyk; Yann Bartosiewicz; Dariusz Butrymowicz. Development of Delayed Equilibrium Model for CO2 convergent-divergent nozzle transonic flashing flow. International Journal of Multiphase Flow 2020, 131, 103351 .
AMA StyleWojciech Angielczyk, Yann Bartosiewicz, Dariusz Butrymowicz. Development of Delayed Equilibrium Model for CO2 convergent-divergent nozzle transonic flashing flow. International Journal of Multiphase Flow. 2020; 131 ():103351.
Chicago/Turabian StyleWojciech Angielczyk; Yann Bartosiewicz; Dariusz Butrymowicz. 2020. "Development of Delayed Equilibrium Model for CO2 convergent-divergent nozzle transonic flashing flow." International Journal of Multiphase Flow 131, no. : 103351.
The prediction of a critical mass flow rate of flashing flow is of crucial importance for many applications in chemical and processing apparatus. One of the most prosperous application is the two-phase ejector as a device with flashing liquid phase as a motive fluid and vapour phase as a secondary fluid. In that case the prediction of critical flashing flow mass flow rate is necessary. A new generalised procedure of the transonic trajectory determination that uses enhanced Possible-Impossible Flow algorithm is proposed. The procedure is much faster than the commonly used Newton Critical Point (NCP) approach. The approach was applied in modelling of carbon dioxide transonic two-phase flow through the convergent-divergent nozzle by means of Homogeneous Equilibrium Model (HEM) and Delayed Equilibrium Model (DEM). These models were used to simulate flows that were experimentally and theoretically investigated in literature. The application of DEM model for determination of the supersonic trajectory part for CO2 flow is a novel contribution provided in the paper. The comparison with literature experimental data revealed that the original closure equations developed for water are improper for CO2 transonic flows, thus the adjusting attempts were demonstrated. It was revealed that the applied Darcy friction factor determination approach significantly influences on the results. Moreover, an effective DEM adjustment is impossible until Lockhart–Martinelli approach is utilised. It was shown that for CO2 case Darcy friction factor calculated by means of Friedel approach is more appropriate than the one calculated by means of the commonly used Lockhart–Martinelli approach. Nevertheless, it was demonstrated that using a frictionless approach would still give better results while adjusting DEM to better approximate the experimental pressure distributions.
Wojciech Angielczyk; Jean Marie Seynhaeve; Jerzy Gagan; Yann Bartosiewicz; Dariusz Butrymowicz. Prediction of critical mass rate of flashing carbon dioxide flow in convergent-divergent nozzle. Chemical Engineering and Processing - Process Intensification 2019, 143, 107599 .
AMA StyleWojciech Angielczyk, Jean Marie Seynhaeve, Jerzy Gagan, Yann Bartosiewicz, Dariusz Butrymowicz. Prediction of critical mass rate of flashing carbon dioxide flow in convergent-divergent nozzle. Chemical Engineering and Processing - Process Intensification. 2019; 143 ():107599.
Chicago/Turabian StyleWojciech Angielczyk; Jean Marie Seynhaeve; Jerzy Gagan; Yann Bartosiewicz; Dariusz Butrymowicz. 2019. "Prediction of critical mass rate of flashing carbon dioxide flow in convergent-divergent nozzle." Chemical Engineering and Processing - Process Intensification 143, no. : 107599.
Paper deals with thermodynamic analysis of operation of the two-phase vapour-liquid injector applied as a liquid pump for the ejection refrigeration systems or Organic Rankine Cycle systems for various working fluids. The analysis is based on formulated thermodynamic model on the basis of the developed dimensionless mass, momentum and energy conservation equations. The availability for achieving maximum discharge pressure and compression efficiency were studied on the basis of the formulated model. The analysis covers the following fluids: isobutane R600a, propane R290, R1234yf, R1234ze(E), R717, R152a, R134a, R454A and R513A. The geometry and thermodynamic parameters necessary to achieve discharge pressure higher than motive pressure as well as maximum efficiency were demonstrated for the selected working fluids.
Kamil Smierciew; Andrzej Pawluczuk; Jerzy Gagan; Dariusz Butrymowicz. Thermodynamic analysis of two-phase injector for various working fluids. Applied Thermal Engineering 2019, 157, 113713 .
AMA StyleKamil Smierciew, Andrzej Pawluczuk, Jerzy Gagan, Dariusz Butrymowicz. Thermodynamic analysis of two-phase injector for various working fluids. Applied Thermal Engineering. 2019; 157 ():113713.
Chicago/Turabian StyleKamil Smierciew; Andrzej Pawluczuk; Jerzy Gagan; Dariusz Butrymowicz. 2019. "Thermodynamic analysis of two-phase injector for various working fluids." Applied Thermal Engineering 157, no. : 113713.
The fin-and-tube air coolers have been extensively used in refrigeration systems applied to cold storage chambers. The performance of the heat exchanger affects the efficiency of the systems and makes the study of heat exchanger becomes important. Prediction of the temperature, humidity, as well as velocity distribution in cold storage chamber requires accurate prediction of operation of the finned air cooler. The presence of the air cooler unit is usually taken into account by the investigators, but with very simplified geometry and physics. Results of numerical modelling using the computational fluid dynamics (CFD) software ANSYS FLUENT of fin-and-tube air cooler is presented in the paper. Two different approaches were used: the Dual Cell Model and porous media model.
Kamil Śmierciew; Jerzy Gagan; Dariusz Butrymowicz. Numerical modelling of air-cooler using simplified methods. E3S Web of Conferences 2018, 70, 02015 .
AMA StyleKamil Śmierciew, Jerzy Gagan, Dariusz Butrymowicz. Numerical modelling of air-cooler using simplified methods. E3S Web of Conferences. 2018; 70 ():02015.
Chicago/Turabian StyleKamil Śmierciew; Jerzy Gagan; Dariusz Butrymowicz. 2018. "Numerical modelling of air-cooler using simplified methods." E3S Web of Conferences 70, no. : 02015.
One of possibilities of reduction of F-gas emission is application of low grade heat to drive the refrigeration systems as well as application of natural or low warming impact working fluids. The own experimental investigation of the ejection refrigeration system operating with refrigerant R-1234zeE are presented and discussed. The system is driven with low grade heat source of temperature below 70°C and thermal capacity approximately 90 kW. The experiments covered the effect of condensation, evaporation and generation temperatures on the capacity and thermal efficiency of the ejection refrigeration system operating for the air-conditioning purposes. Obtained results demonstrated that the proposed system may be thought as the promising heat driven refrigeration system with application of low grade motive heat sources.
Dariusz Butrymowicz; Jerzy Gagan; Kamil Śmierciew; Michał Łukaszuk; Adam Dudar; Andrzej Pawluczuk; Adam Łapiński; Adam Kuryłowicz. Investigations of prototype ejection refrigeration system driven by low grade heat. E3S Web of Conferences 2018, 70, 03002 .
AMA StyleDariusz Butrymowicz, Jerzy Gagan, Kamil Śmierciew, Michał Łukaszuk, Adam Dudar, Andrzej Pawluczuk, Adam Łapiński, Adam Kuryłowicz. Investigations of prototype ejection refrigeration system driven by low grade heat. E3S Web of Conferences. 2018; 70 ():03002.
Chicago/Turabian StyleDariusz Butrymowicz; Jerzy Gagan; Kamil Śmierciew; Michał Łukaszuk; Adam Dudar; Andrzej Pawluczuk; Adam Łapiński; Adam Kuryłowicz. 2018. "Investigations of prototype ejection refrigeration system driven by low grade heat." E3S Web of Conferences 70, no. : 03002.
Jerzy Gagan; Kamil Śmierciew; Dariusz Butrymowicz. Performance of ejection refrigeration system operating with R-1234ze(E) driven by ultra-low grade heat source. International Journal of Refrigeration 2018, 88, 458 -471.
AMA StyleJerzy Gagan, Kamil Śmierciew, Dariusz Butrymowicz. Performance of ejection refrigeration system operating with R-1234ze(E) driven by ultra-low grade heat source. International Journal of Refrigeration. 2018; 88 ():458-471.
Chicago/Turabian StyleJerzy Gagan; Kamil Śmierciew; Dariusz Butrymowicz. 2018. "Performance of ejection refrigeration system operating with R-1234ze(E) driven by ultra-low grade heat source." International Journal of Refrigeration 88, no. : 458-471.
Jerzy Gagan; Kamil Smierciew; Michał Łukaszuk; Dariusz Butrymowicz. Investigations of thermal performance of ejection refrigeration system driven by low grade heat. Applied Thermal Engineering 2018, 130, 1121 -1138.
AMA StyleJerzy Gagan, Kamil Smierciew, Michał Łukaszuk, Dariusz Butrymowicz. Investigations of thermal performance of ejection refrigeration system driven by low grade heat. Applied Thermal Engineering. 2018; 130 ():1121-1138.
Chicago/Turabian StyleJerzy Gagan; Kamil Smierciew; Michał Łukaszuk; Dariusz Butrymowicz. 2018. "Investigations of thermal performance of ejection refrigeration system driven by low grade heat." Applied Thermal Engineering 130, no. : 1121-1138.
Fin-and-tube heat exchangers are extensively used in refrigeration systems applied to cold storage. Performance of the heat exchangers strongly affects the efficiency of refrigeration systems. Prediction of temperature, humidity, as well as velocity distribution in cold storage chamber requires accurate prediction of the finned air cooler operation. The operation of the air cooler unit is usually taken into account in modelling of the cold storage chamber but with very simplified geometry and physics. Results of numerical modelling of cold storage chamber equipped with the fin-and-tube air cooler are presented in the paper. Porous media conditions were applied for modelling of the analysed heat exchanger. The numerical results were evaluated on the basis of the experimental data. Good agreement between numerical and experimental results was achieved.
Kamil Smierciew; Mirosława Kołodziejczyk; Jerzy Gagan; Dariusz Butrymowicz. Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage. Progress in Computational Fluid Dynamics, An International Journal 2018, 18, 325 .
AMA StyleKamil Smierciew, Mirosława Kołodziejczyk, Jerzy Gagan, Dariusz Butrymowicz. Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage. Progress in Computational Fluid Dynamics, An International Journal. 2018; 18 (5):325.
Chicago/Turabian StyleKamil Smierciew; Mirosława Kołodziejczyk; Jerzy Gagan; Dariusz Butrymowicz. 2018. "Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage." Progress in Computational Fluid Dynamics, An International Journal 18, no. 5: 325.
Kamil Śmierciew; Dariusz Butrymowicz; Tomasz Przybyliński; Andrzej Pawluczuk. Investigations of heat and momentum transfer in two-phase injector operating with isobutane. Applied Thermal Engineering 2017, 127, 1495 -1505.
AMA StyleKamil Śmierciew, Dariusz Butrymowicz, Tomasz Przybyliński, Andrzej Pawluczuk. Investigations of heat and momentum transfer in two-phase injector operating with isobutane. Applied Thermal Engineering. 2017; 127 ():1495-1505.
Chicago/Turabian StyleKamil Śmierciew; Dariusz Butrymowicz; Tomasz Przybyliński; Andrzej Pawluczuk. 2017. "Investigations of heat and momentum transfer in two-phase injector operating with isobutane." Applied Thermal Engineering 127, no. : 1495-1505.
The fin-and-tube heat exchanger are extensively used in refrigeration systems applied to cold storage. The performance of the heat exchanger affects the efficiency of the refrigeration system. Prediction of temperature, humidity, as well as velocity distribution in a cold storage chamber requires accurate prediction of operation of the finned air cooler. The operation of the air cooler unit is usually taken into account in modeling of operation of the cold storage chambers, but with very simplified geometry and physics. On the other hand numerical investigations of the heat exchangers are focused on thermal performance mostly in order to improve the overall heat transfer coefficient or to optimize its geometry. Results of numerical modeling using the computational fluid dynamics software ANSYS FLUENT of fin-and-tube air cooler applied on a cold storage chamber is presented in the paper. Two different approaches were used: the dual cell model, and porous media conditions. Numerical predictions of air temperature as well as air velocity at the air cooler outlet were also validated on the basis of the own experimental data.
Kamil Śmierciew; Mirosława Kołodziejczyk; Jerzy Gagan; Dariusz Butrymowicz. Numerical Modeling of Fin Heat Exchanger in Application to Cold Storage. Heat Transfer Engineering 2017, 39, 874 -884.
AMA StyleKamil Śmierciew, Mirosława Kołodziejczyk, Jerzy Gagan, Dariusz Butrymowicz. Numerical Modeling of Fin Heat Exchanger in Application to Cold Storage. Heat Transfer Engineering. 2017; 39 (10):874-884.
Chicago/Turabian StyleKamil Śmierciew; Mirosława Kołodziejczyk; Jerzy Gagan; Dariusz Butrymowicz. 2017. "Numerical Modeling of Fin Heat Exchanger in Application to Cold Storage." Heat Transfer Engineering 39, no. 10: 874-884.
The non-invasive measurement approach of the mean heat transfer coefficient for the packed bed of vegetables may be thought as still open issue. There is a clear need for the assessment of heat transfer conditions for various types of fruits and vegetables in order to accurately predict the thermal load that is necessary to select refrigeration equipment for cold storage chamber. Additionally, there is significant development in numerical modelling of heat and mass transfer processes in cold storage chambers for fruits and vegetables which requires precise heat transfer prediction. The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed of vegetables that is based on single blow technique is presented and discussed in the paper. The approach based on the modified model of Liang and Yang was presented and discussed. The testing stand consisted of a dedicated experimental tunnel along with auxiliary equipment and measurement system are presented. The geometry of the tested vegetables bed were presented. Selected experimental results of heat transfer are presented and discussed for the packed bed of carrots. These results were presented as dimensionless relationship. The obtained results were compared with the existing dimensionless relationships developed for the packed bed consisting of elements of various regular shapes.
Adam Łapiński; Dariusz Butrymowicz; Mirosława Kołodziejczyk. Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables. Acta Mechanica et Automatica 2017, 11, 73 -80.
AMA StyleAdam Łapiński, Dariusz Butrymowicz, Mirosława Kołodziejczyk. Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables. Acta Mechanica et Automatica. 2017; 11 (1):73-80.
Chicago/Turabian StyleAdam Łapiński; Dariusz Butrymowicz; Mirosława Kołodziejczyk. 2017. "Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables." Acta Mechanica et Automatica 11, no. 1: 73-80.
Kamil Smierciew; Jerzy Gagan; Dariusz Butrymowicz; Michał Łukaszuk; Henryk Kubiczek. Experimental investigation of the first prototype ejector refrigeration system with HFO-1234ze(E). Applied Thermal Engineering 2017, 110, 115 -125.
AMA StyleKamil Smierciew, Jerzy Gagan, Dariusz Butrymowicz, Michał Łukaszuk, Henryk Kubiczek. Experimental investigation of the first prototype ejector refrigeration system with HFO-1234ze(E). Applied Thermal Engineering. 2017; 110 ():115-125.
Chicago/Turabian StyleKamil Smierciew; Jerzy Gagan; Dariusz Butrymowicz; Michał Łukaszuk; Henryk Kubiczek. 2017. "Experimental investigation of the first prototype ejector refrigeration system with HFO-1234ze(E)." Applied Thermal Engineering 110, no. : 115-125.
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Dariusz Józef Butrymowicz; Jerzy Gagan; Miroslawa Kolodziejczyk; Kamil Śmierciew. Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage. Progress in Computational Fluid Dynamics, An International Journal 2017, 1, 1 .
AMA StyleDariusz Józef Butrymowicz, Jerzy Gagan, Miroslawa Kolodziejczyk, Kamil Śmierciew. Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage. Progress in Computational Fluid Dynamics, An International Journal. 2017; 1 (1):1.
Chicago/Turabian StyleDariusz Józef Butrymowicz; Jerzy Gagan; Miroslawa Kolodziejczyk; Kamil Śmierciew. 2017. "Numerical simulations of fin and tube air cooler and heat and mass transfer in cold storage." Progress in Computational Fluid Dynamics, An International Journal 1, no. 1: 1.
The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed based on the modified single blow technique was presented and discussed in the paper. The methodology of this measurement approach dedicated to the matrix of the rotating regenerative gas heater was discussed in detail. The testing stand consisted of a dedicated experimental tunnel with auxiliary equipment and a measurement system are presented. Selected experimental results are presented and discussed for selected types of matrices of regenerative air preheaters for the wide range of Reynolds number of gas. The agreement between the theoretically predicted and measured temperature profiles was demonstrated. The exemplary dimensionless relationships between Colburn heat transfer factor, Darcy flow resistance factor and Reynolds number were presented for the investigated matrices of the regenerative gas heater.
Dariusz Butrymowicz; Jarosław Karwacki; Roman Kwidziński; Kamil Śmierciew; Jerzy Gagan; Tomasz Przybyliński; Teodor Skiepko; Marek Łapin. Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers. Chemical and Process Engineering 2016, 37, 341 -358.
AMA StyleDariusz Butrymowicz, Jarosław Karwacki, Roman Kwidziński, Kamil Śmierciew, Jerzy Gagan, Tomasz Przybyliński, Teodor Skiepko, Marek Łapin. Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers. Chemical and Process Engineering. 2016; 37 (3):341-358.
Chicago/Turabian StyleDariusz Butrymowicz; Jarosław Karwacki; Roman Kwidziński; Kamil Śmierciew; Jerzy Gagan; Tomasz Przybyliński; Teodor Skiepko; Marek Łapin. 2016. "Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers." Chemical and Process Engineering 37, no. 3: 341-358.
Heat and mass transfer phenomena occurring in cold storage chambers for vegetables have been modelled in the paper on the example of the experimental Chinese cabbage cold store. Special attention has been given to the problem of modelling of interrelationship between phenomena occurring in the bulk of vegetables and in the heat exchanger of a cooling unit, accomplished through User Defined Functions UDF so that the cooling capacity and the transpiration and respiration in the bed of cabbage were closely related. The comparisons between simulation and experimental results were conducted in order to indicate further improvements to the model
Miroslawa Kolodziejczyk; Kamil Smierciew; Jerzy Gagan; Dariusz Butrymowicz. Numerical Modelling of Heat and Mass Transfer in Vegetables Cold Storage. Procedia Engineering 2016, 157, 279 -284.
AMA StyleMiroslawa Kolodziejczyk, Kamil Smierciew, Jerzy Gagan, Dariusz Butrymowicz. Numerical Modelling of Heat and Mass Transfer in Vegetables Cold Storage. Procedia Engineering. 2016; 157 ():279-284.
Chicago/Turabian StyleMiroslawa Kolodziejczyk; Kamil Smierciew; Jerzy Gagan; Dariusz Butrymowicz. 2016. "Numerical Modelling of Heat and Mass Transfer in Vegetables Cold Storage." Procedia Engineering 157, no. : 279-284.
The paper presents numerical simulation of two-phase flow in a heated capillary with evaporation on the meniscus. To solve the problem, a model of evaporation from meniscus was developed in which the dynamics of liquid-vapour interface is described by the Cahn-Hilliard equation. The numerical simulations were performed using commercial software for 2D axially symmetric case. The flow evolution was analysed for different values of heat transfer coefficient at the capillary wall and inlet liquid mass flow rate.
Jarosław Karwacki; Helena Nowakowska; Marcin Lackowski; Dariusz Butrymowicz. Numerical analysis of evaporation in microchannel under capillary pumping. Archives of Thermodynamics 2015, 36, 3 -25.
AMA StyleJarosław Karwacki, Helena Nowakowska, Marcin Lackowski, Dariusz Butrymowicz. Numerical analysis of evaporation in microchannel under capillary pumping. Archives of Thermodynamics. 2015; 36 (2):3-25.
Chicago/Turabian StyleJarosław Karwacki; Helena Nowakowska; Marcin Lackowski; Dariusz Butrymowicz. 2015. "Numerical analysis of evaporation in microchannel under capillary pumping." Archives of Thermodynamics 36, no. 2: 3-25.
Kamil Śmierciew; Dariusz Butrymowicz; Roman Kwidziński; Tomasz Przybyliński. Analysis of application of two-phase injector in ejector refrigeration systems for isobutane. Applied Thermal Engineering 2015, 78, 630 -639.
AMA StyleKamil Śmierciew, Dariusz Butrymowicz, Roman Kwidziński, Tomasz Przybyliński. Analysis of application of two-phase injector in ejector refrigeration systems for isobutane. Applied Thermal Engineering. 2015; 78 ():630-639.
Chicago/Turabian StyleKamil Śmierciew; Dariusz Butrymowicz; Roman Kwidziński; Tomasz Przybyliński. 2015. "Analysis of application of two-phase injector in ejector refrigeration systems for isobutane." Applied Thermal Engineering 78, no. : 630-639.
The chapter presents the development of ejector refrigeration technology that strongly reduces the greenhouse gases emission by using natural refrigerants and also dramatically reduces the need for the electric power. This is accomplished by using free or inexpensive heat – either solar or waste heat, as the main source of energy instead of electricity. Nowadays, the thermal driven refrigeration system, especially with low-temperature heat source became more and more popular. The operation of the ejection cycle using low-temperature heat source can be considered as very attractive and the ejection cycles becomes truly competitive in comparison with the absorption refrigeration systems.
Dariusz Józef Butrymowicz; Kamil Leszek Śmierciew; Jerzy Gagan; Jarosław Karwacki. Ejection Refrigeration Cycles. Electric Vehicles and the Future of Energy Efficient Transportation 2015, 155 -206.
AMA StyleDariusz Józef Butrymowicz, Kamil Leszek Śmierciew, Jerzy Gagan, Jarosław Karwacki. Ejection Refrigeration Cycles. Electric Vehicles and the Future of Energy Efficient Transportation. 2015; ():155-206.
Chicago/Turabian StyleDariusz Józef Butrymowicz; Kamil Leszek Śmierciew; Jerzy Gagan; Jarosław Karwacki. 2015. "Ejection Refrigeration Cycles." Electric Vehicles and the Future of Energy Efficient Transportation , no. : 155-206.
Short state-of-the-art on the enhancement of condensation heat transfer techniques by means of condensate drainage is presented in this paper. The electrohydrodynamic (EHD) technique is suitable for dielectric media used in refrigeration, organic Rankine cycles and heat pump devices. The electric field is commonly generated in the case of horizontal tubes by means of a rod-type electrode or mesh electrodes. Authors proposed two geometries in the presented own experimental investigations. The first one was an electrode placed just beneath the tube bottom and the second one consisted of a horizontal finned tube with a double electrode placed beneath the tube. The experimental investigations of these two configurations for condensation of refrigerant R-123 have been accomplished. The obtained results confirmed that the application of the EHD technique for the investigated tube and electrode arrangement caused significant increase in heat transfer coefficient. The condensation enhancement depends both on the geometry of the electrode system and on the applied voltage.
Dariusz Butrymowicz; Jarosław Karwacki; Marian Trela. Condensation enhancement by means of electrohydrodynamic techniques. Archives of Thermodynamics 2014, 35, 3 -27.
AMA StyleDariusz Butrymowicz, Jarosław Karwacki, Marian Trela. Condensation enhancement by means of electrohydrodynamic techniques. Archives of Thermodynamics. 2014; 35 (4):3-27.
Chicago/Turabian StyleDariusz Butrymowicz; Jarosław Karwacki; Marian Trela. 2014. "Condensation enhancement by means of electrohydrodynamic techniques." Archives of Thermodynamics 35, no. 4: 3-27.