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Publication
Large Diameter Earth-Air Heat Exchanger for Space Cooling and Heating: Preliminary Post-Occupancy Findings
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Advisor(s)
Abstract(s)
The main goal of the paper is to describe and provide a preliminary discussion of the performance of a large diameter earth -air
heat exchanger used in cooling and heating of a small office building located in Alentejo, Portugal. The sole energy consumption
associated with this system is that required to operate two fans that move outdoor air into the office spaces. There are no
mechanical moving parts inside the office building and the heat exchanger is designed in combination and complementing
principles of natural ventilation in the office spaces.
Post-occupancy results show the large diameter design of the earth-air heat exchanger is capable of removing up to 30 kW of
heat from the outdoor air using just 2,2 kW of fan power. Despite the significant cooling requirements in Alentejo, Portugal, earth air heat exchanger outflow air temperatures can be 10 K lower than outdoor temperatures, allowing the removal of office space
loads in the morning period and supplying offices in the afternoon with air at temperatures that seldom exceed 27°C, despite
outdoor air temperatures of 40°C.
Description
Keywords
Earth-air heat exchanger (EAHE) Ventilation Geothermal energy Solar energy Office building Hypocriocaust
Citation
Duarte, R., Gomes, M.-G. & Moret-Rodrigues, A.(2021).Large Diameter Earth-Air Heat Exchanger for Space Cooling and Heating: Preliminary Post-Occupancy Findings. In Proceedings of the 2021 International Conference on Construction, Energy, Environment and Sustainability (CEES 2021), 12-15 october 2021, Coimbra, Portugal.