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Energies 2013, 6(1), 351-373; doi:10.3390/en6010351
Article

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

1
, 2,*  and 1
Received: 9 November 2012; in revised form: 24 December 2012 / Accepted: 5 January 2013 / Published: 15 January 2013
(This article belongs to the Special Issue Energy Efficient Buildings and Green Buildings)
Download PDF [396 KB, uploaded 15 January 2013]
Abstract: 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.
Keywords: low energy building; air heating system; wood pellet stove; heat recovery ventilation; triple concentric tube heat exchanger; analytical solution low energy building; air heating system; wood pellet stove; heat recovery ventilation; triple concentric tube heat exchanger; analytical solution
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Peigné, P.; Inard, C.; Druette, L. Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger. Energies 2013, 6, 351-373.

AMA Style

Peigné P, Inard C, Druette L. Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger. Energies. 2013; 6(1):351-373.

Chicago/Turabian Style

Peigné, Pierre; Inard, Christian; Druette, Lionel. 2013. "Ventilation Heat Recovery from Wood-Burning Domestic Flues. A Theoretical Analysis Based on a Triple Concentric Tube Heat Exchanger." Energies 6, no. 1: 351-373.


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