Toward the synthesis of global optimum heat exchanger networks under multiple-periods of operation

1991 ◽  
Vol 8 (2) ◽  
pp. 95-104 ◽  
Author(s):  
In-Beum Lee
Keyword(s):  
Heat Exchanger ◽  
Global Optimum ◽  
Heat Exchanger Networks ◽  
Optimum Heat

scholarly journals A SIMPLE FIVE-STEP METHODOLOGY TO DETERMINE CONTROLLABILITY OF HEAT EXCHANGER NETWORKS USING STEADY-STATE INFORMATION

2011 ◽  
Author(s):  
Rodolfo Tellez ◽  
William Y. Svrcek ◽  
Brent R. Young
Keyword(s):  
Steady State ◽  
Heat Exchanger ◽  
Process Integration ◽  
Plant Design ◽  
State Information ◽  
Step Procedure ◽  
Heat Exchanger Networks ◽  
Propose Control Strategy ◽  
Optimum Heat ◽  
And Control

Process integration design methodologies have been developed and introduced to synthesise an optimum heat exchanger network (HEN) arrangement. However, controllability issues are often overlooked during the early stages of a plant design. In this paper we present a five-step procedure that involves the use of multivariable disturbance and control analyses based solely on steady-state information and with the purpose to assess process design developments and to propose control strategy alternatives appropriate and suitable for a HEN.

Optimum heat storage design for solar-driven absorption refrigerators integrated with heat exchanger networks

AIChE Journal ◽  
2013 ◽  
Vol 60 (3) ◽  
pp. 909-930 ◽  
Author(s):  
Luis Fernando Lira-Barragán ◽  
José María Ponce-Ortega ◽  
Medardo Serna-González ◽  
Mahmoud M. El-Halwagi
Keyword(s):  
Heat Exchanger ◽  
Heat Storage ◽  
Heat Exchanger Networks ◽  
Optimum Heat

The Use of the Second Law of Thermodynamics in Process Design

1995 ◽  
Vol 117 (3) ◽  
pp. 179-185 ◽  
Author(s):  
D. A. Sama
Keyword(s):  
Heat Exchanger ◽  
Design Procedure ◽  
Second Law Of Thermodynamics ◽  
Global Optimum ◽  
Second Law ◽  
Complex Processes ◽  
Cost Of Energy ◽  
Heat Exchanger Networks ◽  
Improved Design ◽  
Optimum Solution

The importance of using the second law of thermodynamics in the design of heat exchangers, heat exchanger networks, and processes in general, is discussed. The optimal ΔT at a refrigerated heat exchanger is considered from a second law viewpoint. It is shown that the use of minimum total annualized cost as the single optimizing factor is unsatisfactory. Total annualized costs are based on predicted costs of fuel, equipment, and capital, which are uncertain at best. Instead of a singular or “global optimum” ΔT, there is a range of optimal ΔTs, over which the total annualized cost is essentially the same, but within which the distribution between cost of capital and cost of energy is significantly different. In selecting a design ΔT, this distribution of costs should also be considered. The possibility of only one singular, or global optimum, solution for complex processes is also considered from a philosophical viewpoint, and is again rejected. The existence and identification of design decisions which unnecessarily waste thermodynamic availability (physical exergy) are discussed and identified as “second law errors.” Elimination of a second law error from a design guarantees an improved design. An optimal design, which may be any one of a numerous set of optimal designs, will result when all second law errors are eliminated. A design procedure to develop optimal process designs, using such thermodynamic insights, is proposed.

Differences Between Second Law Analysis and Pinch Technology

1995 ◽  
Vol 117 (3) ◽  
pp. 186-191 ◽  
Author(s):  
D. A. Sama
Keyword(s):  
Heat Exchanger ◽  
Energy Recovery ◽  
Maximum Energy ◽  
Global Optimum ◽  
Second Law ◽  
Heat Exchanger Network ◽  
Second Law Analysis ◽  
Heat Exchanger Networks ◽  
Pinch Technology ◽  
Correct Design

The use of second law analysis to design a heat exchanger network is compared with the pinch technology approach. Differences between the two methods are identified and discussed in the light of claims made by practitioners of pinch technology. Second law insights are used to easily identify and correct design errors in a heat exchanger network, and to design maximum energy recovery networks. More importantly, it is found that use of the second law provides an understanding of the process which is totally absent in the pinch technology approach. The claims that pinch technology can find global optimum solutions, that only pinch technology can find maximum energy recovery heat exchanger networks, and that pinch technology is a form of second law analysis, are considered, discussed, and shown to be invalid.

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