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. 2021 Mar:35:102009.
doi: 10.1016/j.jobe.2020.102009. Epub 2020 Nov 18.

Experimental investigation of a decentralized heat recovery ventilation system

Tugce Pekdogan  1 , Ayça Tokuç  2 , Mehmet Akif Ezan  3 , Tahsin Başaran  1
Affiliations

Experimental investigation of a decentralized heat recovery ventilation system

Tugce Pekdogan et al. J Build Eng. 2021 Mar.

Abstract

Indoor air quality is an important issue for improving and maintaining the indoor environment because it is directly related to people's health and work performance. These days, in many settlements, the applicability of natural ventilation is limited in the face of the decreasing infiltration loads, increased atmospheric pollution, and the climatic conditions. Therefore, the use of mechanical systems that are designed to ensure proper ventilation is becoming widespread. This paper presents full-scale experimental research of a wall-integrated decentralized ventilation system with heat recovery in the laboratory conditions. The heat recovery unit includes a ceramic block for sensible thermal energy storage. Parametric experimental studies were carried out to obtain the temperature distributions and the thermal capacity of the ceramic block during the supply and exhaust modes of working. In order to simulate the winter and summer conditions, two large scale temperature-controlled rooms are built up. The duration of the ventilation period is varied to be 1, 2, 5, 7.5 and 10-min. Experimental measurements indicate that 2 min of operation time shows the best thermal performance in terms of maintaining a comfortable indoor temperature with the least energy consumption. And some shortcomings were observed about the fan and thermal storage limitations.

Keywords: Decentralized heat recovery; Indoor air quality; Sensible energy storage; Ventilation.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1
Plan (a) and section (b) of the experimental setup (not in scale).
Fig. 2
Fig. 2
Positions of the ventilation channels on the aerated wall.
Fig. 3
Fig. 3
Channel setup and measurement points (not in scale).
Fig. 4
Fig. 4
Thermocouple layout inside the ceramic heat exchanger (not in scale).
Fig. 5
Fig. 5
Calculated normalized air velocity.
Fig. 6
Fig. 6
Heat recovery system operating for 10 min with 1-min cycles in simulated winter conditions for Channel 1 and 2.
Fig. 7
Fig. 7
Heat recovery system operating for 6 min with 2-min cycles in simulated winter conditions for Channel 1 and 2.
Fig. 8
Fig. 8
Heat recovery system operating for 20 min with 5-min cycles in simulated winter conditions for Channel 1 and 2.
Fig. 9
Fig. 9
Heat recovery system operating for 15 min with 7.5-min cycles in simulated winter conditions for Channel 1 and 2.
Fig. 10
Fig. 10
Heat recovery system operating for 15 min with 7.5-min cycles in simulated summer conditions for Channel 1 and 2.
Fig. 11
Fig. 11
Heat recovery system operating for 10 min in simulated winter conditions for Channel 1 and 2.
Fig. 12
Fig. 12
Heat recovery system operating for 10 min in simulated summer conditions for Channel 1 and 2.
Fig. 13
Fig. 13
Comparison of average heat transfer rates on Channel 1 and 2.
Fig. A
Fig. A
The flow chart of the studies to calculate heat recovery unit performance.
See this image and copyright information in PMC

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