Optimization of counterflow heat exchanger geometry through minimization of entropy generation

P.P.M. Lerou, T.T. Veenstra, Johannes Faas Burger, Hermanus J.M. ter Brake, Horst Rogalla

Research output: Contribution to journalArticleAcademicpeer-review

82 Citations (Scopus)

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.
Original languageUndefined
Pages (from-to)659-669
Number of pages11
JournalCryogenics
Volume45
Issue number10-11
DOIs
Publication statusPublished - 2005

Keywords

  • METIS-227184
  • IR-76636
  • Optimization
  • Counterflow heat exchangers (E)
  • Micro cryocooler
  • Entropy minimization
  • Joule-Thomson coolers (E)

Cite this

Lerou, P.P.M. ; Veenstra, T.T. ; Burger, Johannes Faas ; ter Brake, Hermanus J.M. ; Rogalla, Horst. / Optimization of counterflow heat exchanger geometry through minimization of entropy generation. In: Cryogenics. 2005 ; Vol. 45, No. 10-11. pp. 659-669.
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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.",
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Optimization of counterflow heat exchanger geometry through minimization of entropy generation. / Lerou, P.P.M.; Veenstra, T.T.; Burger, Johannes Faas; ter Brake, Hermanus J.M.; Rogalla, Horst.

In: Cryogenics, Vol. 45, No. 10-11, 2005, p. 659-669.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Optimization of counterflow heat exchanger geometry through minimization of entropy generation

AU - Lerou, P.P.M.

AU - Veenstra, T.T.

AU - Burger, Johannes Faas

AU - ter Brake, Hermanus J.M.

AU - Rogalla, Horst

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

KW - METIS-227184

KW - IR-76636

KW - Optimization

KW - Counterflow heat exchangers (E)

KW - Micro cryocooler

KW - Entropy minimization

KW - Joule-Thomson coolers (E)

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DO - 10.1016/j.cryogenics.2005.08.002

M3 - Article

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