Solar district heating on the Roof of the World
Submitted by Baerbel Epp on February 27, 2018
Photo: Task 55
“Tibet has double the radiation found at most central European cities and enjoys similar levels of sunshine each month,” Jiao Qingtai, Vice President of the Sunrain Group, said of the region’s solar potential during a presentation at the Task 55 meeting in Abu Dhabi, UAE, in November 2017 (see the photo above). With average temperatures of below zero in northern and around 8 °C in southern Tibet, there is large demand for heating all year round.

Tibet, an autonomous region of China, with a local government in Lhasa, has 72 counties.
Source: https://kchew.wordpress.com
Langkazi county, which is surrounded by tall mountains on all four sides, is in the southeastern part of Tibet, an average 4,500 metres above sea level. Up here, the boiling point of water is as little as 85 °C, a great challenge for anyone designing district heating systems. Qingtai said that the town’s advantage was a lack of heating equipment in its building stock. It meant that new space heating units could be adapted to accept a fairly low supply temperature, 70 °C to be exact. Hydraulic adjustment inside the buildings would then lead to a rather low return temperature of 40 °C.
The solar system is part of a larger project to develop renewable heating in Tibet. Feasibility studies were conducted in more than 20 of the region’s counties and cities and Tibet’s local government has approved funding for five of them. The county of Langkazi has already completed its tender process, awarding the contract to Arcon-Sunmark Large-Scale Solar Systems. The joint venture is now in charge of the entire Renminbi (RNB) 122 million investment (USD 19.26 million), including the construction of the seasonal storage, collector field and district heating network.
Organisations mentioned in the article:
