Analysis of Cryogenic Refrigeration Cycle Using Two Stage Intercooler

2010 ◽  
Vol 297-301 ◽  
pp. 1146-1151 ◽  
Author(s):  
Ho Saeng Lee ◽  
S.T. Oh ◽  
Jung In Yoon ◽  
S.G. Lee ◽  
K.H. Choi
Keyword(s):  
Natural Gas ◽  
Liquefied Natural Gas ◽  
Performance Characteristics ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Compression Process ◽  
Methane Cycle ◽  
Two Stage ◽  
Yield Efficiency ◽  
Cycle Efficiency

This paper presents the comparison of performance characteristics for the several natural gas liquefaction cycles. The liquefaction cycle with the staged compression was designed and simulated for improving the cycle efficiency using HYSYS software. This includes a cascade cycle with a two-stage intercooler which is consisted of a Propane, Ethylene and Methane cycle. In addition, these cycles are compared with a modified staged compression process. The key parameters of the above cascade cycles were compared and analyzed. The COP (Coefficient of Performance) of the cascade cycle with a two-stage intercooler and a modified staged compression process is 13.7% and 29.7% higher than that of basic cycle. Also, the yield efficiency of LNG (Liquefied Natural Gas) improved compared with the basic cycle by 28.5%.

Theoretical performance of transcritical carbon dioxide cycle with two-stage compression and intercooling

2005 ◽  
Vol 219 (2) ◽  
pp. 187-195 ◽  
Author(s):  
J. S. Baek ◽  
E. A. Groll ◽  
P. B. Lawless
Keyword(s):  
Carbon Dioxide ◽  
System Analysis ◽  
Coefficient Of Performance ◽  
System Efficiency ◽  
Compression Process ◽  
Two Stage ◽  
Bell Curve ◽  
Second Stage ◽  
Transcritical Carbon Dioxide ◽  
Theoretical Performance

A computer model was developed to perform a thermodynamic analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling. In typical two-stage compression with intercooling applications, the intercooler serves the purpose of cooling the fluid to the lowest possible temperature before it enters the second-stage compressor. This paper presents the results of the system analysis of the transcritical carbon dioxide cycle with two-stage compression and intercooling (intercooler cycle) and identifies the pressure ratios that provide maximum system efficiency. The results show that the coefficient of performance (COP), curves of the intercooler cycle are different from the ‘typical bell curve behaviours’ that are observed when plotting the COP versus the intermediate pressure with assumptions of isentropic and real compression process.

Performance Characteristics of a Magnetic Ericsson Refrigeration Cycle Using La(Fe0.88Si0.12)13H1 or Gd as the Working Substance

2013 ◽  
Vol 631-632 ◽  
pp. 322-325 ◽  
Author(s):  
Jun Yi Wang ◽  
Gildas Diguet ◽  
Guo Xing Lin ◽  
Jin Can Chen
Keyword(s):  
Numerical Calculation ◽  
Room Temperature ◽  
Magnetic Refrigeration ◽  
Performance Characteristics ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Regenerative Heat ◽  
Heat Quantity ◽  
Room Temperature Magnetic Refrigeration

Based on the experimental characteristics of iso-field entropy varying with temperature for the room-temperature magnetic refrigeration material La(Fe0.88Si0.12)13H1 or Gd, the regenerative Ericsson refrigeration cycle using La(Fe0.88Si0.12)13H1 or Gd as the working substance is established and their thermodynamic performances are evaluated and analyzed. By means of numerical calculation, the influence of non-perfect regeneration on the main thermodynamic performances of the cycle is revealed and discussed. Furthermore, the coefficient of performance (COP), non-perfect regenerative heat quantity, and net cooling quantity of the Ericsson refrigeration cycle using La(Fe0.88Si0.12)13H1 or Gd as the working substance are compared. The results obtained show that it is beneficial to the cooling quantity of the cycles using La(Fe0.88Si0.12)13H1 or Gd as the working substance to operate in the region of Tcold >T0 and, at the condition of a same temperature span, the cooling quantity for La(Fe0.88Si0.12)13H1 is larger than that for Gd.

Energy Efficient Polymers for Gas-Liquid Heat Exchangers

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Patrick Luckow ◽  
Avram Bar-Cohen ◽  
Peter Rodgers ◽  
Juan Cevallos
Keyword(s):  
Thermal Conductivity ◽  
Life Cycle ◽  
Heat Exchanger ◽  
Natural Gas ◽  
Energy Expenditure ◽  
Heat Exchangers ◽  
Sea Water ◽  
Coefficient Of Performance ◽  
Offshore Platforms ◽  
Compression Process

The compression process necessary for the liquefaction of natural gas on offshore platforms generates large amounts of heat, usually dissipated via sea water cooled plate heat exchangers. To date, the corrosive nature of sea water has mandated the use of metals, such as titanium, as heat exchanger materials, which are costly in terms of life cycle energy expenditure. This study investigates the potential of a commercially available, thermally conductive polymer material, filled with carbon fibers to enhance thermal conductivity by an order of magnitude or more. The thermofluid characteristics of a prototype polymer seawater-methane heat exchanger that could be used in the liquefaction of natural gas on offshore platforms are evaluated based on the total coefficient of performance (COPT), which incorporates the energy required to manufacture a heat exchanger along with the pumping power expended over the lifetime of the heat exchanger, and compared with those of conventional heat exchangers made of metallic materials. The heat exchanger fabricated from a low energy, low thermal conductivity polymer is found to perform as well as, or better than, exchangers fabricated from conventional materials, over its full lifecycle. The analysis suggests that a COPT nearly double that of aluminum, and more than ten times that of titanium, could be achieved. Of the total lifetime energy use, 70% occurs in manufacturing for a thermally enhanced polymer heat exchanger compared with 97% and 85% for titanium and aluminum heat exchangers, respectively. The study demonstrates the potential of thermally enhanced polymer heat exchangers over conventional ones in terms of thermal performance and life cycle energy expenditure.

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