نتایج جستجو برای: heat exchanger networks

تعداد نتایج: 634335  

2006
A. - M. Gustafsson

Thermal response test (TRT) is an established method to determine design parameters for borehole heat exchanger (BHE) systems; borehole thermal resistance and effective ground thermal conductivity. Most commonly, these tests are performed with heat injection, using the same assumed power level as the planned BHE system. For a thorough description of TRT and current activities around the world, ...

2011
T. Friebel R. Haber U. Schmitz

In the presented paper two quality parameters are used to represent the state of a heat exchanger. The remaining lifetime can be estimated by trend regression. Also of interest is the uncertainty of the predicted lifetime which is determined by the confidence interval of the parameter estimation. These algorithms developed are used in this paper in an off-line evaluation of the measurements on ...

2009
Kaliannan Saravanan Rangasamy Rajavel

In the present study, the heat transfer coefficients of benzene in a spiral plate heat exchanger are investigated. The test section consists of a Plate of width 0.3150 m, thickness 0.001 m and Mean hydraulic diameter of 0.01 m. The mass flow rate of water (Hot fluid) is varying from 0.5 kg sec to 0.8 kg sec and the mass flow rate of benzene (cold fluid) varies from 0.4 kg sec to 0.7 kg sec. Exp...

2005
A. D. Sommers A. M. Jacobi

In most domestic and commercial refrigeration systems, frost forms on the air-side surface of the air-to-refrigerant heat exchanger. Frost-tolerant designs typically employ a large fin spacing in order to delay the need for a defrost cycle. Unfortunately, this approach does not allow for a very high air-side heat transfer coefficient, and the performance of these heat exchangers is often air-si...

Journal: :Frontiers in chemical engineering 2021

This paper presents a new algorithm for the design of heat exchanger networks (HEN) that tries to take advantage strengths sequential and simultaneous approaches. It is divided into two parts. The first one an adaptation transportation model (TransHEN). maintains concept temperature intervals considers possibility transfer between all hot cold streams inside those intervals, at same time it all...

2001
Q. Z. Yan Y. L. Huang

( ) Design of a cost-effecti®e and highly controllable heat-exchanger network HEN has drawn a great deal of attention for years. One of the key issues in such a design is how to effecti®ely minimize undesirable disturbance propagation in a network with minimum cost increment. Design options in this regard include the deri®ation of a superior network structure and the selection of bypasses assoc...

Journal: :Computers & Chemical Engineering 2003
Leonardo L. Giovanini Jacinto L. Marchetti

A low-level flexible-structure control is proposed for designing control systems capable of efficiently handling constraints on the manipulated variables of heat exchanger networks (HENs). Flexible-structure refers to the capability of the resulting control system to switch from one closed-loop structure to another in order to keep regulation, and low-level means that it can be configured in mo...

2015
Ignacio Quesada Ignacio E. Grossmann

This paper deals with the global optimization of heat exchanger networks with fixed topology. It is shown that if linear area cost functions are assumed, as well as arithmetic mean driving force temperature differences in networks with isothermal mixing, the corresponding NLP optimization problem involves linear constraints and linear rational functions in the objective which are nonconvex. A r...

2016
Petar Sabev Varbanov Peng-Yen Liew Jun-Yow Yong Jiří Jaromír Klemeš Hon Loong Lam Navid Rohani Etienne Ayotte-Sauvé Omid Ashrafi Serge Bédard

This work considers improving the heat recovery of an existing heat exchanger network (HEN) while minimizing the total annualized cost of the retrofit design. The focus is on stepwise approaches that generate, starting from the base case network, a candidate retrofit HEN at each step in order to sequentially retrofit the HEN topology while permitting user intervention during the resolution proc...

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