A novel method for assessment of pinch point characteristics of heat exchangers with different combinations of pure fluid and binary mixture as hot and cold streams

2019 ◽  
Vol 181 ◽  
pp. 342-358 ◽  
Author(s):  
Navid Mahdavi ◽  
Shahram Khalilarya
Keyword(s):  
Binary Mixture ◽  
Heat Exchangers ◽  
Pinch Point ◽  
Pure Fluid ◽  
Novel Method

Influence of Pressure on the Performance of Heat Exchangers in Ammonia-Water Based Power Cycles

2012 ◽  
Vol 229-231 ◽  
pp. 1085-1089 ◽  
Author(s):  
Kyoung Hoon Kim ◽  
Chul Ho Han
Keyword(s):  
Power Generation ◽  
Heat Exchangers ◽  
Waste Heat ◽  
Inlet Pressure ◽  
Working Fluid ◽  
Pinch Point ◽  
Ammonia Water ◽  
Temperature Distributions ◽  
Turbine Inlet ◽  
Water Based

Recently the power generation systems using ammonia-water binary mixture as a working fluid have been attracted much attention for efficient conversion of low-temperature waste heat sources to useful energy forms. In this work, ammonia-water based Rankine (AWR) and regenerative Rankine (AWRR) power generation cycles are comparatively analyzed by investigating the effects of turbine inlet pressure on the performances of heat exchangers in AWR and AWRR systems. Temperature distributions of fluid streams in the heat exchanging devices are closely examined at different levels of turbine inlet pressure under the conditions that the minimum temperature difference of hot and cold streams reaches the prescribed pinch point. Results show that the position of pinch point and temperature distributions are sensitively affected by varying turbine inlet pressure, which might be the most important design consideration in the power systems using a binary working fluid.

Computer Aided Optimal Design of Heat Exchanger Networks

1991 ◽  
Author(s):  
P. Seshadri ◽  
Larry C. Witte
Keyword(s):  
Heat Exchanger ◽  
Temperature Difference ◽  
Heat Exchangers ◽  
Minimum Temperature ◽  
Mathematical Formulation ◽  
Computer Algorithms ◽  
Pinch Point ◽  
Pinch Technology ◽  
Computer Based ◽  
Economic Considerations

Abstract A method for finding the best (optimal) operating layout of heat exchangers in complicated thermal networks is developed in this paper. Computer algorithms are developed that take advantage of pinch technology and economic considerations, and exergetic constraints as well as conventional heat and mass balances. Our goals were to achieve minimum loss of exergy between hot and cold streams subject to practical system constraints. Furthermore, resulting networks should be limited to no more units than the theoretical minimum. The ultimate goal was to minimize investment and operating costs for a set of fixed overall system constaints. These goals were realized by developing a computer-based nonlinear multiple objective optimization algorithm that included the elements discussed above. The final solution is a synthesis of the best system using the above-described mathematical formulation. Results for a 4-stream heat exchanger network are presented in terms of the minimum temperature difference at the pinch point. The influence of the minimum temperature difference on capital cost, heat transfer area, exergetic losses and second law efficiency of various heat exchangers in the network is presented.

scholarly journals Investigation on the pinch point position in heat exchangers

2016 ◽  
Vol 25 (3) ◽  
pp. 258-265 ◽  
Author(s):  
Lisheng Pan ◽  
Weixiu Shi
Keyword(s):  
Heat Exchangers ◽  
Pinch Point ◽  
Point Position
Sign in / Sign up

Export Citation Format

Share Document