Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger

This paper presents a new air-heating system concept for energy-efficient dwellings. It is a system designed to heat a low-energy building by coupling a heat-recovery ventilation system with a three-fluid heat exchanger located on the chimney of a wood-pellet stove. The proposed work focuses on the...

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Main Authors: Lionel Druette, Christian Inard, Pierre Peigné
Format: Article
Language:English
Published: MDPI AG 2013-01-01
Series:Energies
Subjects:
Online Access:http://www.mdpi.com/1996-1073/6/1/351
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spelling doaj-2436fcf53c2b429394e827323e8727d42020-11-24T23:44:12ZengMDPI AGEnergies1996-10732013-01-016135137310.3390/en6010351Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat ExchangerLionel DruetteChristian InardPierre PeignéThis paper presents a new air-heating system concept for energy-efficient dwellings. It is a system designed to heat a low-energy building by coupling a heat-recovery ventilation system with a three-fluid heat exchanger located on the chimney of a wood-pellet stove. The proposed work focuses on the heat transfer that occurs between flue gases, the ventilation air and the combustion air within a triple concentric tube heat exchanger with no insulation at its outer surface. The main objective is to predict outlet temperature for the specific geometry of the heat exchanger studied here. Thus, the governing differential equations are derived for a counter-co-current flow arrangement of the three fluids. Then analytical solutions for the steady-state temperature distribution are obtained as well as the amount of heat transferred to the outside. An expression for the effectiveness of the heat exchanger is also proposed. Based on these results, calculations are performed on a case study to predict the fluid temperature distribution along the heat exchanger. Finally, a parametric study is carried out on this case study to assess the influence of the relevant parameters on the effectiveness of the heat exchanger. In addition, computation of heat losses to the outside justifies whether insulation is needed.http://www.mdpi.com/1996-1073/6/1/351low energy buildingair heating systemwood pellet stoveheat recovery ventilationtriple concentric tube heat exchangeranalytical solution
collection DOAJ
language English
format Article
sources DOAJ
author Lionel Druette
Christian Inard
Pierre Peigné
spellingShingle Lionel Druette
Christian Inard
Pierre Peigné
Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
Energies
low energy building
air heating system
wood pellet stove
heat recovery ventilation
triple concentric tube heat exchanger
analytical solution
author_facet Lionel Druette
Christian Inard
Pierre Peigné
author_sort Lionel Druette
title Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
title_short Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
title_full Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
title_fullStr Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
title_full_unstemmed Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger
title_sort ventilation heat recovery from wood-burning domestic flues. a theoretical analysis based on a triple concentric tube heat exchanger
publisher MDPI AG
series Energies
issn 1996-1073
publishDate 2013-01-01
description This paper presents a new air-heating system concept for energy-efficient dwellings. It is a system designed to heat a low-energy building by coupling a heat-recovery ventilation system with a three-fluid heat exchanger located on the chimney of a wood-pellet stove. The proposed work focuses on the heat transfer that occurs between flue gases, the ventilation air and the combustion air within a triple concentric tube heat exchanger with no insulation at its outer surface. The main objective is to predict outlet temperature for the specific geometry of the heat exchanger studied here. Thus, the governing differential equations are derived for a counter-co-current flow arrangement of the three fluids. Then analytical solutions for the steady-state temperature distribution are obtained as well as the amount of heat transferred to the outside. An expression for the effectiveness of the heat exchanger is also proposed. Based on these results, calculations are performed on a case study to predict the fluid temperature distribution along the heat exchanger. Finally, a parametric study is carried out on this case study to assess the influence of the relevant parameters on the effectiveness of the heat exchanger. In addition, computation of heat losses to the outside justifies whether insulation is needed.
topic low energy building
air heating system
wood pellet stove
heat recovery ventilation
triple concentric tube heat exchanger
analytical solution
url http://www.mdpi.com/1996-1073/6/1/351
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