Plastic Pipes Conference Association # 2023 Lake Buena Vista
Yi Zhong, Qianshi Ma, Haihua Yu
BSTRACT The residential district adopts central heating for low temperature radiators system. Due to the disrepair of the secondary heating pipe network that pipe from heat exchange station to user entrance, the running, leaking, dripping and leakage are serious, and the accidents occur frequently. The heat transmission efficiency is low and the energy consumption is large. From the beginning of heating water injection, the maximum daily maintenance increases up to 28 times, the water loss of pipe network increase up to 17T/h, the maintenance cost approaches to 45,000 CNY/year while the water loss cost is 135,000 CNY/year. To ensure normal heating for residents, the heat company raised the mixed water temperature of the heat exchange station by 5℃, but the indoor heating temperature of residents could only be kept at 15℃.
Compared with steel pipe, pre-insulated plastic pipe with PE-RT type II pipes has the characteristics of long service life (≥50 years), lower weight, better thermal insulation performance, small hydraulic loss, simple laying and easy bending. A typical case is the heat supply system. By comparing various pipes, they finally choice of SDR11 PE-RT type II plastic pipes as the secondary heating pipe network of the residential district for centralized transformation. After renovation, the operating temperature is 60℃ and 40℃, PD 6 bar. The average indoor heating temperature of residents was 20℃~24℃. Up to now, after a five-heating period operation monitoring, no complains occurs for the heating system network which has good operation effects. According to the operation data of the residential district in past five years, the total cost of water and labor is saved at least 850,000 CNY, including 340,000 tons of water saving and over 200,000 CNY of maintenance cost saving.
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