Saga in Tibet tests solar heating in public buildings

Saga in Tibet tests solar heating in public buildings

Since November 2019, the southern Tibetan town of Saga has been home to the fourth solar district heating plant in the region after similar systems had already been installed in Langkazi, Shenzha and Zhongba. The plant, which is currently undergoing testing, has a heat generation capacity of 13.4 MWth (19,136 m2) and includes large flat plate collectors by Chinese manufacturer Jinheng Solar as well as two storage units that can hold 4,500 m3 each. The state-owned Zhongjiu Construction Engineering Group was responsible for the turnkey delivery of the entire solar system, the laying of the pipes to end consumers and the installation of the heating centre. According to Jinheng Solar, construction was carried out during the summer season between last May and last October. 
Photo: Jinheng Solar
 
“The field in Saga features our EFPC115 collectors, which have 11.4 m2 of gross area and are designed for space heating applications,” said Sherry Wu, Sales Director at Jinheng Solar. The SDH plant provides space heating for public buildings in Saga, not residential properties. Its backup system consists of electric boilers.
 
A report published on 22 November at China Clean Heating Plaza (http://www.chplaza.com.cn/) says that the performance test phase of the solar district heating system started in November, whereas the entire project would most likely be completed this spring. In addition to a solar field, the project also includes a heating centre, which houses three 1 MW water heat pumps and three 1 MW oil boilers, and energetic modernisation of buildings, according to the online article.
 

Start of construction

May 2019

In testing since

November 2019

Situated at a height of

 4,900 m

Solar field size

13.4 MWth (19,136 ㎡ )

Collector type

 EFPC 115 (11.4 m2)

Solar collector supplier

Jinheng (BTE) Solar, China

Storage tanks

Two, each capable of holding 4,500 m3

Solar fraction

About 60 %

Backup system

Electric boilers

Total investment, including cost of district heating network and backup

RMB 154 million (EUR 20.1 million)

Funding source

Chinese central government

Heat clients connected to DH grid

Space heating in schools, a hospital, council buildings, a theatre, etc. with a total floor space of 80,000 m2

Supply temperature

65 ℃

Return temperature

50 ℃

Organisation that owns and operates the SDH field

Zhongjiu Construction Engineering Group, China

Key data on the SDH project in Saga
Source: Jinheng (BTE) Solar / China Clean Heating Plaza
 
The support structure underneath the solar field consists of blocks of cement, to which metal bars are fixed at the top (left). A crane then lifts the collectors onto this support structure.
Photos: Jinheng Solar
 
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