The Performance of a High Altitude and High Solar Fraction Large-Scale District Heating Project

摘要

A large-scale solar district heating project in Langkazi. Tibet, China utilizes a solar thermal system with a pit storage to supply space heating to Langkazi County through a district heating network. The project was constructed by the consortium of Sunrain Group, Solareast Arcon-Sunmark and Beijing District Heating Co., Ltd.The project is located at 90°40'77.58" E and 28°97'56.13" N with an altitude of 4,600m, where the temperature in winter could reach as low as -30°C and the heating season lasts as long as 251 days.Total investment of the project is RMB 173 million. With a heating area of 152,000 m~2, the project was implemented in two phases, among which phase I (2018) features a total investment of about RMB 120 million and heating area of 82,600 m~2. Project phase I was completed by the end of November 2018.Design concept: Overall planning and step-by-step implementation. In the design and construction of phase I, scalable conditions were reserved for future phase Ⅱ in that the heat exchange station and main heat supply network were built to accommodate the total heating area of 152,000 m~2. The heat exchange station and technical rooms have reserved space for flexible expansion of equipment in future phase II.