Research Papers: Thermal Systems

Constructal Design of an Entropic Wall With Circulating Water Inside

[+] Author and Article Information
Michele Trancossi

Faculty of Arts, Computing,
Engineering and Sciences,
Department of Engineering and Mathematics,
Sheffield Hallam University,
City Campus, Howard Street,
Sheffield S1 1WB, UK
e-mail: m.trancossi@shu.ac.uk

Jill Stewart

Faculty of Arts, Computing,
Engineering and Sciences,
Department of Engineering and Mathematics,
Sheffield Hallam University,
City Campus, Howard Street,
Sheffield S1 1WB, UK
e-mail: j.stewart@shu.ac.uk

Antonio Dumas

Dipartimento di Scienza e
Metodi dell'Ingegneria,
Università di Modena e Reggio Emilia,
Via Amendola, 2,
Reggio Emilia 42100, Italy
e-mail: antonio.dumas@unimore.it

Mauro Madonia

Dipartimento di Scienza e Metodi dell'Ingegneria,
Università di Modena e Reggio Emilia,
Via Amendola, 2,
Reggio Emilia 42100, Italy
e-mail: mauro.madonia@unimore.it

Jose Pascoa Marques

Departamento de Engenharia Eletromecânica,
Universidade da Beira Interior,
Covilhã 6200, Portugal
e-mail: pascoa@ubi.pt

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 13, 2014; final manuscript received April 6, 2016; published online April 26, 2016. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 138(8), 082801 (Apr 26, 2016) (9 pages) Paper No: HT-14-1187; doi: 10.1115/1.4033346 History: Received April 13, 2014; Revised April 06, 2016

An entropic wall with circulating water inside could be a solution for acclimatizing a new building with high-energy efficiency and high levels of internal comfort. If circulating water is thermally stabilized by exchanging in the ground such has it happens in geothermal plants, a thermal shield could be realized keeping walls in comfort conditions and minimizing energy needs for further temperature regulations. This paper presents optimization guidelines of such a wall with the objective of maximizing the performances of the wall for reaching optimal internal wellness conditions. Optimization has been realized by a constructal law based method, which has been personalized by a step-by-step process and has been named constructal design for efficiency (CDE). The optimization of the system has been produced at different levels. It starts from a preliminary analysis at system levels, which allow defining the best objectives that could be reached. After this preliminary process, the system has been divided into modules, and the critical ones which have higher influence on the performances of the system have been evaluated. This analysis has been coupled also with an industrial analysis with the goal of defining an effective layout, which could be also manufactured with acceptable costs. The result has produced a final solution with a very good compromise between energetic performances and minimization of costs at industrial level. The results open interesting perspectives for the constructal law to become the core of an effective methodology of an industrial design which can couple perfectly with the modular approach which is currently the major part of industrial companies.

Copyright © 2016 by ASME
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Fig. 1

LESP-based building and plant schema

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Fig. 2

LESP wall schematic concept

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Fig. 3

Seasonal behavior of the proposed wall

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Fig. 4

Schema of the necessary multiobjective and multidisciplinary optimization process, which is performed at industrial level

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Fig. 5

Schema of the wall with identification of the elemental volume

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Fig. 7

Heat fluxes from interior temperature to thermal barrier and from interior barrier to exterior temperature (winter case)

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Fig. 8

Heat fluxes from exterior temperature to thermal barrier and from interior temperature to barrier (summer case)

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Fig. 9

Difference of heat dissipation (%) between traditional wall and LESP wall (winter)

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Fig. 10

Heat dispersed from the barrier to the external environment for different wall thicknesses

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Fig. 11

Mass flow of water/glycol solution necessary to reach the predefined goals

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Fig. 12

Rack of pipes transversal section

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Fig. 13

Honeycomb extruded panel insertion transversal section

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Fig. 14

Foaming setup schematic representation: (a) rack of pipes and (b) honeycomb panel

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Fig. 16

Required velocity of the ethylene glycol water solution



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