PERT II heat pipe is a new type of pipe. In fact, PERT II heat pipe is PERT II prefabricated direct buried insulation pipe. It is mainly used in the secondary pipe network of heating systems in northern towns. It can also be used in hot water hot water pipe systems and buildings. Hot water pipe system. PERT II heat pipe is suitable for industrial and civil building hot and cold water pipeline systems, drinking water systems, pre-heated buried pipes, ground radiant heating systems and high-temperature ground source heat pump systems, etc., especially in the north for urban heating systems. Pipe network PERT II heat-resistant tube.
The working tube of the PERT II heating tube is a PE-RT II tube.
PE-RT II heat-resistant polyethylene prefabricated direct buried composite plastic pipe includes heat-resistant polyethylene (PE-RTII) work pipe, polyurethane (PU) foam insulation layer and high-density polyethylene (PE-HD) outer protection pipe. These three layers become an integrated structure.
道系统重量轻，布局灵活，不需要防腐蚀，使用寿命长，保温性能好。 PERT II thermal piping system is light weight, flexible layout, does not need anti-corrosion, long service life, and good thermal insulation performance. The production of PE-RTII pipes and fittings, foaming of insulation layers and subsequent inspections of actual construction have confirmed that PE-RTII insulation pipes are easy to install in local heat transfer, have a low total cost and have good social and economic efficiency .
In China, most of the heating pipes built before the 1990s were unpaintable. The trenches and brick-concrete structures were poorly waterproof. A large amount of sewage was discharged through the thermal trenches, and the water in the trenches was very serious. The heating pipe is immersed for many years, the pipeline insulation is damaged, the pipeline and the valve are severely corroded, and the chemical descaling agent is used to accelerate the corrosion of the pipe network, and a large amount of heat energy is lost when the pipe network is transported. At the same time, the newly built residential heat pipe network does not have an effective hot water pipe system. The normal design life of China's heat pipe network is 20 years, but according to local experience, the pipe network has been severely corroded for 15 years. Check or remodel. On July 31, 2013, the Standing Committee of the State Council identified six key challenges for strengthening urban infrastructure construction, aiming to supplement the "short board" of urban development and improve the transformation of old gas heating pipelines. I have set it up. In the central heating zone, the conversion of 80,000 kilometers of city gas and nearly 100,000 kilometers of central heating has become an important task.
In the recent autumn and winter seasons, large-scale fog often occurs, and people have to consider the impact of coal heating on air quality in winter. Local governments are actively seeking new heating methods, and central heating has become the main heating method used by local governments.
Compared with other heating methods, the central heating boiler has the following advantages: the central heating boiler has a large capacity, high thermal efficiency, and good economy. Combined heat and power to improve energy efficiency and economic efficiency.
Central heating mainly includes heat sources, main networks, secondary pipe networks and users, but today we mainly deal with the use of secondary pipe networks. Generally, the temperature of the water supply in the secondary network is 60-85 ° C. In the previous secondary pipe network, the main purpose was to use metal insulated pipes for a long time. Metal pipes have these problems or problems, large heat loss and high maintenance costs.
PERT II型热力管 CJ/T480-2015和当地建筑标准DB37的相关标准。 With the development of society and the European advanced heating pipe network system, China has introduced the relevant standards of PERT II type heat pipe CJ / T480-2015 and the local building standard DB37. -T5021-2014. PERT II型热力管 具有以下优点： Compared with the traditional secondary pipe network heating system, the PERT II type heat pipe has the following advantages:
No corrosion protection requirements;
Pipe network has no pollution to water quality
50 years life, only 30% of life cycle cost
Low heat loss. PE-RT thermal conductivity is 0.4w / mk, steel tube thermal conductivity is 30 ~ 40w / mk