Linn Verde Thon

T: +47 916 24 639

Related services

District energy
Energy planning

In partnership with Transport for London (TfL) and the Greater London Authority (GLA), Ramboll is producing a detailed study into the feasibility of extracting heat from an underground railway ventilation system in a technically and financially viable way. This feasibility study is built on experience from “the Bunhill project” , in which Ramboll designed and delivered district heating to 1,350 homes using waste heat from the London Underground. 

The waste heat can provide a low carbon heat source for homes and businesses in North East London, and the idea is to distribute it via a district heating network at ambient temperatures, to heat existing homes while reducing energy costs and carbon emissions at the same time. 

Distributing at ambient temperatures in this way is new to the UK but has several benefits: not only does it utilise the urban waste heat for district heating, it also demonstrates how heating and cooling solutions can be integrated, resulting in environmental savings. 

This solution has never been done before, but it has the potential to make a substantial contribution to sustainability in the area, if implemented. 

The solution will impact the area by: 

  • Saving approx. 380,000 tonnes of CO2 over 25 years
  • Reducing infrastructure costs (heating and cooling from a single network)
  • Reducing heat loss due to lower network temperatures
  • Linking low grade energy sources over large distances
  • Absorbing energy from heat sources with temperatures considered too low to be useful for conventional district heating.
  • Reducing energy requirements from primary energy source (rivers, sewers, waste heat etc.) through simultaneous heating and cooling.
  • Supplying conventional district heating networks via high temperature heat pumps

Ambient loops can be used with a range of low temperature heat sources including heat from chillers, canals and rivers, sewers etc. They can also help enable DHC networks to supply both newly constructed buildings and existing stock, and their varying heating system temperature demands.

Sustainability facts

  • Saving approx. 380,000 tonnes of CO2 over 25 years
  • Reducing heat loss
  • Utilising urban waste heat for low carbon district heating