Heat recovery from air in underground transport tunnels

Konstantinos Ninikas*, Nicholas Hytiris, Rohinton Emmanuel, Bjorn Aaen, Paul L. Younger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)
283 Downloads (Pure)


The performance of a typical air source heat pump could be increased dramatically by a relatively stable air temperature with a high humidity, even during the peak heating months. In this short communication we show such conditions exist in the underground transport tunnels of the Glasgow Subway system, where we had conducted an annual survey of air flow, air temperature and relative humidity at thirty different points within the subway network. We found relatively stable temperatures and sufficient air movement inside the twin tunnels (average temperature during winter = 15 °C, annual variation = 2.6 °C; average air flow = 16.47 m3/h) indicating higher system efficiency compared to a conventional air source heat pump installation. Potential energy and carbon savings are discussed.
Original languageEnglish
Pages (from-to)843-849
Number of pages7
JournalRenewable Energy
Issue numberA
Early online date19 May 2016
Publication statusPublished - Oct 2016


  • heat recovery
  • thermal comfort
  • air source heat pump


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