scholarly journals Fuzzy Analogical Gate to Select the Best Design of Heat Exchanger Network

2019 ◽  
Vol 8 (3) ◽  
pp. 2913-2919
Keyword(s):  
Heat Exchanger ◽  
Case Studies ◽  
Temperature Difference ◽  
Minimum Temperature ◽  
Heat Exchanger Network ◽  
Systematic Method ◽  
Optimum Solution

This article shows a systematic method to choose the optimal minimum temperature in order to get a flexible HEN and more operable by utilizing the fuzzy analogical gate way for the tradeoff between two cost capital and operating for a given minimum temperature difference. By follow, three steps to choose the best minimum approach temperature 1) obtain minimum utilities target 2) obtain of the area of all HEN 3) fuzzy analogical gates to select the best minimum temperature difference. The recommended method was be conducted on two case studies well known in published literature yielded an optimum solution that is consistent with a different approach. It is clear the fuzzy analogical gate performance is completely hopeful; it is simple and has ability to be applied by manual calculations.

Selection of minimum temperature difference (ΔTmin) for heat exchanger network synthesis based on trade-off plot

2016 ◽  
Vol 162 ◽  
pp. 1259-1271 ◽  
Author(s):  
Suraya Hanim Abu Bakar ◽  
Mohd. Kamaruddin Abd. Hamid ◽  
Sharifah Rafidah Wan Alwi ◽  
Zainuddin Abdul Manan
Keyword(s):  
Heat Exchanger ◽  
Temperature Difference ◽  
Minimum Temperature ◽  
Network Synthesis ◽  
Heat Exchanger Network ◽  
Trade Off ◽  
Selection Of ◽  
Heat Exchanger Network Synthesis

Design and Analysis of a Heat Exchanger Network

2012 ◽  
Vol 9 (1) ◽  
pp. 85-91
Author(s):  
Mohammad Azim Aijaz ◽  
T. S. Ravikumar
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Rate ◽  
Temperature Difference ◽  
Transfer Rate ◽  
Outlet Temperature ◽  
Optimal Temperature ◽  
Heat Exchanger Network ◽  
Cold Fluid ◽  
Temperature Heat

the hot fluid outlet temperature, cold fluid outlet temperature, heat transfer rate and effectiveness at varying hot and cold fluid inlet temperatures using, log mean temperature difference (LMTD) and effectiveness-number of transfer units (ε-NTU) method. The obtained result illustrates how heat transfer rate and effectiveness increases or decreases at varying hot and cold fluid inlet temperatures. The result obtained from both LMTD and å-NTU method gives statistically significant values. The objective of this paper is to find out the optimal temperature at which heat transfer rate and effectiveness are maximum.

scholarly journals HEAT EXCHANGER NETWORK SYNTHESIS CONSIDERING CHANGING PHASE STREAMS

2004 ◽  
Vol 3 (2) ◽  
pp. 87
Author(s):  
F. S. Liporace ◽  
F. L. P. Pessoa ◽  
E. M. Queiroz
Keyword(s):  
Heat Exchanger ◽  
Temperature Difference ◽  
Design Method ◽  
Network Synthesis ◽  
Heat Exchanger Network ◽  
Pinch Point ◽  
Specific Heats ◽  
Temperature Ranges ◽  
Heat Exchanger Network Synthesis

The Pinch Design Method was developed considering one-phase streams, with constant specific heats (Cp) throughout streams’ temperature ranges. Its first stage, the determination of utilities targets and pinch point (PP), is ruled by the number of streams, their temperatures and MCp. But, for changing phase streams, the usual description of the Cp behavior by a constant value can lead to errors in this stage and, hence, in the synthesis one. This work proposes a procedure to deal with these streams and discusses its results through an example involving multicomponent streams. First, bubble (BP) and dew (DP) points of the streams are estimated. Then, changing phase streams are split into sub-streams, using BP and DP as bounds. For each one, an effective Cp is estimated as the division of the enthalpy change by the respective temperature difference. Results obtained show significant changes on the PP, utilities targets and network proposed structure.

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 Heat Exchanger Network Retrofit of an Oleochemical Plant through a Cost and Energy Efficiency Approach

2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Valli Trisha ◽  
Kai Seng Koh ◽  
Lik Yin Ng ◽  
Vui Soon Chok
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Cost Effective ◽  
Capital Cost ◽  
Global Market ◽  
Annual Saving ◽  
Heat Exchanger Network ◽  
First Case ◽  
Payback Time ◽  
Better Than

Limited research of heat integration has been conducted in the oleochemical field. This paper attempts to evaluate the performance of an existing heat exchanger network (HEN) of an oleochemical plant at 600 tonnes per day (TPD) in Malaysia, in which the emphases are placed on the annual saving and reduction in energy consumption. Using commercial HEN numerical software, ASPEN Energy Analyzer v10.0, it was found that the performance of the current HEN in place is excellent, saving over 80% in annual costs and reducing energy consumption by 1,882,711 gigajoule per year (GJ/year). Further analysis of the performance of the HEN was performed to identify the potential optimisation of untapped heating/cooling process streams. Two cases, which are the most cost-effective and energy efficient, were proposed with positive results. However, the second case performed better than the first case, at a lower payback time (0.83 year) and higher annual savings (0.20 million USD/year) with the addition of one heat exchanger at a capital cost of USD 134,620. The first case had a higher payback time (4.64 years), a lower annual saving (0.05 million USD/year) and three additional heaters at a capital cost of USD 193,480. This research has provided a new insight into the oleochemical industry in which retrofitting the HEN can further reduce energy consumption, which in return will reduce the overall production cost of oleochemical commodities. This is particularly crucial in making the product more competitive in its pricing in the global market.

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