Vapor Compression Refrigeration Testing on Parabolic Flights: Part 2 - Heat Exchanger Performance

2021 ◽  
Author(s):  
Leon P.M. Brendel ◽  
Stephen L. Caskey ◽  
James E. Braun ◽  
Eckhard A. Groll
Keyword(s):  
Heat Exchanger ◽  
Vapor Compression ◽  
Parabolic Flights ◽  
Vapor Compression Refrigeration

scholarly journals THEORETICAL AND EXPERIMENTAL ANALYSIS OF A VAPOR-COMPRESSION REFRIGERATION CYCLE WITH A HEAT EXCHANGER BETWEEN THE SUCTION AND LIQUID LINES

2019 ◽  
Vol 18 (2) ◽  
pp. 19
Author(s):  
L. S. Santana ◽  
J. Castro ◽  
L. M. Pereira
Keyword(s):  
Heat Exchanger ◽  
Experimental Analysis ◽  
Thermodynamic Cycle ◽  
Electrical Energy ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration ◽  
Liquid Heat

Vapor-compression refrigeration systems require a significant amount of electrical energy. Therefore, there is a need for finding efficient ways of operating this equipment, reducing their energy consumption. The use of heat exchangers between the suction line and the liquid line can produce a better performance of the thermodynamic cycle, as well as reduce it. The present work aims at an experimental analysis of the suction/liquid heat exchanger present in a freezer running with refrigerant fluid R-134a. Three different scenarios were used in order to evaluate the thermal performance of the refrigeration cycle. The first scenario was the conventional freezer set up to collect the required data for further comparison. Moreover, the second and third scenarios were introduced with a 20 cm and 40 cm suction/liquid heat exchanger, respectively, into the system. From the experiments, it was observed that the heat exchange does not significantly affect the coefficient of performance (COP) of the freezer. It was concluded from this work that the best scenario analyzed was the 20 cm suction/liquid heat exchanger where most of the thermodynamic properties were improved, one of them being the isentropic efficiency.

Hybrid Desiccant Cooling System Using Condensing Heat as the Regeneration Source. Part I: System Model

2011 ◽  
Vol 383-390 ◽  
pp. 6422-6426 ◽  
Author(s):  
Xing Han ◽  
Xu Zhang
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Energy Saving ◽  
Cooling System ◽  
System Model ◽  
Sensible Heat ◽  
Vapor Compression ◽  
Refrigeration Unit ◽  
Vapor Compression Refrigeration

In this paper, a scheme of hybrid desiccant dehumidification system was proposed. This system can recovery the condensing heat from the vapor compression refrigeration unit to remove moisture from the air. But the trick of energy saving is the sensible heat exchanger after the desiccant rotary wheel. After analysis of its energy consumption characteristic, the system model was established.

scholarly journals Refrigeration System Performance by Inserting Twisted Strip in Condenser Along With Liquid Suction Heat Exchanger

2019 ◽  
Vol 8 (6S4) ◽  
pp. 156-159 ◽  
Keyword(s):  
Heat Exchanger ◽  
System Performance ◽  
Cutting Edge ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Condenser Tube ◽  
Evaporator Temperature ◽  
Vapor Compression Refrigeration ◽  
Tube Condenser

This paper gives preliminary aftereffects of VCR (Vapor Compression Refrigeration) go through setting twisted strip inside the condenser tube, using liquid suction warmth exchanger (lshe), and R134a as refrigerant in this cycle. examination executed on basic condenser tube with 3 different bended point strips verified in condenser tubes on the element of liquid suction heat exchanger for subcooling to remove suitable COP from cutting edge VCR machine. inside the proposed, lshe are taken through using each the procedures, strip focuses, α=a hundred,one hundred forty &one hundred eighty by methods for undeniable chamber and with subcooling. The proposed check has additionally made a through and through appraisal of COP, refrigeration influence, charge of impact and capability. in the communicated test; it's miles put that the drop in weight is 16% for the twisted strip tube condenser while in evaluation to customary condenser tube. other than it's in like manner seen that condenser with bowed strip implanted increments quick rot inside the temperature of evaporator than basic chamber. The effect and viability of misshaped strip verified cylinder condenser is unnecessary as strain drop falls in the condenser and decline of evaporator temperature

scholarly journals KAJI EKSPERIMENTAL SISTEM DESTILASI ASAP PEMBAKARAN SAMPAH PLASTIK MENJADI BAHAN BAKAR ALTERNATIF DENGAN PENDINGINAN SISTEM REFRIGERASI KOMPRESI UAP

KURVATEK ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 87-94
Author(s):  
Arda Rahardja Lukitobudi ◽  
Sugiyarto ◽  
Muhammad Setya Ramadhan ◽  
Dinda Ainun Qolbi
Keyword(s):  
Heat Exchanger ◽  
Alternative Fuel ◽  
Plastic Waste ◽  
Local Temperature ◽  
Vapor Compression ◽  
Counter Flow ◽  
Tube Heat Exchanger ◽  
One Step ◽  
Vapor Compression Refrigeration ◽  
Waste Burning

One step to reduce plastic waste and at the same time to produce alternative fuel is by pyrolysis of smoke destilation of plastic waste burning result because basically the material of plastic waste is hydrocarbon. This research will be discussed about experimaental study of smoke destilator machine of plastic waste burning result using vapor compression refrigeration system in various temperature without analizing the economical factor. There was two step destilation done, using local temperature air and by refrigerated heat exchanger using 35% propylene glycol as secondary refrigerant and with R134A as the primary refrigerant. In destilation step using secondary refrigerant was done by baffled counter flow tube in tube heat exchanger in order to obtain turbulent flow and was done in various temperature that was local temperature air and temperature under 10℃: 9℃, 3℃ and -3℃. The plastic waste which was burnt is 2 kg Low Density PolyEthylene LDPE using reactor with L:40cm x W:40cm x H:60cm and 3 kg elpiji gas burner in temperature of ±400°C. The design was assumed to maximize plastic waste burnt result smoke destilation process. The lower destilation temperature generate the higher alternative fuel volume. During ±4 hours measurement, with temperature of 9℃ generates 480 mL fuel, while 3℃ generates 615 mL fuel, -3℃ generates 710 mL fuel and with local temperature destilation only generates 390 mL fuel.

Design of a Screw Heat Exchanger as the Liquid-Suction Heat Exchanger in a Vapor Compression Refrigeration System

2015 ◽  
Author(s):  
Francis J. Antonio ◽  
Menandro S. Berana ◽  
Louis Angelo M. Danao
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cross Sections ◽  
Cfd Simulation ◽  
Constant Heat Flux ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Constant Wall Temperature ◽  
Tube Heat Exchanger ◽  
Vapor Compression Refrigeration

The aim of this study is to optimize the design of a screw heat exchanger (SHX) in terms of varying coil aspect ratio (CAR) as a liquid-suction heat exchanger (LSHE) in a vapor compression refrigeration system through Computational Fluid Dynamics (CFD) simulation. The novelty of this study is that it focuses on the fluid-to-fluid heat transfer of SHX to measure its heat transfer effectiveness as compared to many research studies that focus only on helical duct heat exchanger under constant wall temperature and constant heat flux. Optimization of the SHX was done through conjugate heat transfer in a CFD model. High confidence on the computational package was determined as the results of the package on heat transfer between water flows through a shell-and-coil heat exchanger match well with available experimental data of the same setup in related literature. The performance of SHX with square coil section (SHXSCS) was compared to that of the SHX with circular coil section (SHXCCS). The optimum SHXSCS was then compared to a commercially available LSHE in the form of tube-in-tube heat exchanger (TTHE) which is the most commonly used LSHE in vapor compression refrigeration systems. The SHXSCS has nominal degrees of superheat of 22.17 °C and nominal degrees of subcool of 17.63 °C. The ratio of the heat of superheating to that of subcooling is seen to increase with increasing CAR and NTU. The RE of SHXSCS is larger by an average of 3.87%, 18.25% and 26.46% compared to those of the SHXCCS, TTHE and the standard vapor compression cycle (VCC), respectively. The COP of the SHXSCS is 2.55%, 10.74% and 5.94% higher than those of the SHXCCS, TTHE and the standard VCC, respectively. The SHXSCS is more capable than SHXCCS in splitting the heat due to the less complicated square cross sections of flows and even less interface materials for heat transfer. Moreover, the SHXSCS is more effective in splitting the heat from subcooling into moderated superheating and largely to the surounding compared to the TTHE mainly due to longer length of interaction of the flows.

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