A counterflow heat exchanger (CFHX) is an essential element for recuperative cooling cycles. The performance of the CFHX strongly influences the overall performance of the cryocooler. In the design of a heat exchanger, different loss mechanisms like pressure drop and parasitic heat flows are often treated separately. Acceptable values for the pressure drop and total heat leakage are estimated and thus a CFHX geometry is more or less arbitrarily chosen. This article applies another, less familiar design strategy where these losses are all treated as a production of entropy. It is thus possible to compare and sum them. In this way, a CFHX configuration can be found that is optimal for a certain application, producing a minimum of entropy and thus has minimum losses. As an example, the design steps of a CFHX for the micro cooling project at the University of Twente are given. Also a generalization of micro CFHX dimensions for cooling powers between 10 and 120 mW is presented.
Description
Optimization of counterflow heat exchanger geometry through minimization of entropy generation 10.1016/j.cryogenics.2005.08.002 : Cryogenics | ScienceDirect.com
%0 Journal Article
%1 Lerou2005659
%A Lerou, P.P.P.M.
%A Veenstra, T.T.
%A Burger, J.F.
%A ter Brake, H.J.M.
%A Rogalla, H.
%D 2005
%J Cryogenics
%K 2005 EGM heat-exchanger optimization
%N 10--11
%P 659 - 669
%R 10.1016/j.cryogenics.2005.08.002
%T Optimization of counterflow heat exchanger geometry through minimization of entropy generation
%U http://dx.doi.org/10.1016/j.cryogenics.2005.08.002
%V 45
%X A counterflow heat exchanger (CFHX) is an essential element for recuperative cooling cycles. The performance of the CFHX strongly influences the overall performance of the cryocooler. In the design of a heat exchanger, different loss mechanisms like pressure drop and parasitic heat flows are often treated separately. Acceptable values for the pressure drop and total heat leakage are estimated and thus a CFHX geometry is more or less arbitrarily chosen. This article applies another, less familiar design strategy where these losses are all treated as a production of entropy. It is thus possible to compare and sum them. In this way, a CFHX configuration can be found that is optimal for a certain application, producing a minimum of entropy and thus has minimum losses. As an example, the design steps of a CFHX for the micro cooling project at the University of Twente are given. Also a generalization of micro CFHX dimensions for cooling powers between 10 and 120 mW is presented.
@article{Lerou2005659,
abstract = {A counterflow heat exchanger (CFHX) is an essential element for recuperative cooling cycles. The performance of the CFHX strongly influences the overall performance of the cryocooler. In the design of a heat exchanger, different loss mechanisms like pressure drop and parasitic heat flows are often treated separately. Acceptable values for the pressure drop and total heat leakage are estimated and thus a CFHX geometry is more or less arbitrarily chosen. This article applies another, less familiar design strategy where these losses are all treated as a production of entropy. It is thus possible to compare and sum them. In this way, a CFHX configuration can be found that is optimal for a certain application, producing a minimum of entropy and thus has minimum losses. As an example, the design steps of a CFHX for the micro cooling project at the University of Twente are given. Also a generalization of micro CFHX dimensions for cooling powers between 10 and 120 mW is presented.},
added-at = {2012-02-27T10:56:12.000+0100},
author = {Lerou, P.P.P.M. and Veenstra, T.T. and Burger, J.F. and ter Brake, H.J.M. and Rogalla, H.},
biburl = {https://www.bibsonomy.org/bibtex/2d7de6809abcdb5a299535802fa1eb96e/thorade},
description = {Optimization of counterflow heat exchanger geometry through minimization of entropy generation 10.1016/j.cryogenics.2005.08.002 : Cryogenics | ScienceDirect.com},
doi = {10.1016/j.cryogenics.2005.08.002},
interhash = {72b1a17b1f99f19c98842e8e37e52d07},
intrahash = {d7de6809abcdb5a299535802fa1eb96e},
issn = {0011-2275},
journal = {Cryogenics},
keywords = {2005 EGM heat-exchanger optimization},
number = {10--11},
pages = {659 - 669},
timestamp = {2012-02-27T10:56:12.000+0100},
title = {Optimization of counterflow heat exchanger geometry through minimization of entropy generation},
url = {http://dx.doi.org/10.1016/j.cryogenics.2005.08.002},
volume = 45,
year = 2005
}