Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

On Preheating of the Outdoor Ventilation Air

Version 1 : Received: 6 December 2019 / Approved: 7 December 2019 / Online: 7 December 2019 (01:48:05 CET)

How to cite: Romanska-Zapala, A.; Bomberg, M.; Dechnik, M.; Fedorczak-Cisak, M.; Furtak, M. On Preheating of the Outdoor Ventilation Air. Preprints 2019, 2019120090 (doi: 10.20944/preprints201912.0090.v1). Romanska-Zapala, A.; Bomberg, M.; Dechnik, M.; Fedorczak-Cisak, M.; Furtak, M. On Preheating of the Outdoor Ventilation Air. Preprints 2019, 2019120090 (doi: 10.20944/preprints201912.0090.v1).

Abstract

Growing popularity of buildings with integrated sub-systems, requires a review of methods to optimize the preheat of ventilation air. An integrated system permits using geothermal heat storage parallel to the direct outdoor air intake with additional treatment in the mechanical room as a part of building automatic control system. Earth Air Heat Exchanger (EAHX) has many advantages but also has many unanswered questions. Some of the drawbacks are: a possible entry of radon gas, high humidity in the shoulder seasons as well as the need for two different air intake sources with a choice that depends on the actual weather conditions. While in winter, the EAHX may be used continuously to ensure thermal comfort, in other seasons, its operation must be automatically controlled. To generate the missing information about the EAHX technology we have examined two nearly identical EAHX systems, one placed in ground next to the building and the other under the basement slab. In another project, we have reinforced the ground storage action by heat exchanger placed on the return pipes of the hydronic heating system. Effectively, the information provided in this paper, shows advantages of merging both these approaches while the EAHX could be placed under the house or near the basement foundation that is using an exterior basement insulation.

Subject Areas

earth-air heat exchanger; energy efficiency; using thermal mass; smart and integrated control systems; thermal comfort

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