### Abstract

Original language | Undefined |
---|---|

Pages (from-to) | 659-669 |

Number of pages | 11 |

Journal | Cryogenics |

Volume | 45 |

Issue number | 10-11 |

DOIs | |

Publication status | Published - 2005 |

### Keywords

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

### Cite this

*Cryogenics*,

*45*(10-11), 659-669. https://doi.org/10.1016/j.cryogenics.2005.08.002

}

*Cryogenics*, vol. 45, no. 10-11, pp. 659-669. https://doi.org/10.1016/j.cryogenics.2005.08.002

**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.

Research output: Contribution to journal › Article › Academic › peer-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)

U2 - 10.1016/j.cryogenics.2005.08.002

DO - 10.1016/j.cryogenics.2005.08.002

M3 - Article

VL - 45

SP - 659

EP - 669

JO - Cryogenics

JF - Cryogenics

SN - 0011-2275

IS - 10-11

ER -