Well

by 9aincemiss on 2012-02-12 07:58:10

Ai Fang website news on November 10, 2011: Sunshine 100 Hohai, end-of-project surprise - 90%, 92%, and 94% discounts! For sale are small unit public housing units ranging from 72-101 square meters, fully renovated at an average price of 8000 yuan per square meter; LOFT units from 84-115 square meters, fully renovated at an average price of 9500 yuan per square meter; 137 square meter and 164 square meter two-elevator-two-household units with air conditioning included, fully renovated at an average price of 7600 yuan per square meter, electric floor heating. Public housing units from 170-380 square meters fully renovated with floor heating at an average price of 9500 yuan per square meter, floor heating system installed, lakeside villas fully renovated with central air conditioning at an average price of 28000 yuan per square meter. In November, there will be a new opening for lake-view properties of 80, 90, 110, and 130 square meters near the central lake, prices to be announced upon opening, with expected move-in by June 2013.

Sunshine 100 (parameters, prices, unit types, available units, albums, maps, reviews) Free sales office consultation hotline 400 823 6688 extension 10386

PE-RT has captured attention due to its excellent stability, long-term pressure resistance, easy bending and construction, good impact resistance, high safety, aging resistance and long life, convenient processing technology, quality control, and recyclable waste pipes. As PE-RT becomes increasingly familiar to people, the PEX pipe monopoly in the underfloor heating market is gradually being broken. Currently, PE-RT pipes and PEX pipes together have become the mainstream products in the underfloor heating market.

The rapid development of PE-RT pipes and technical upgrades

With the annual increase of underfloor heating consumers moving southward, PE-RT pipes have entered their golden age of development. China has now become the largest global market for PE-RT, and PE-RT has also been upgraded, becoming one of the fastest-growing pipe materials in recent years.

So why can PE-RT develop so quickly? This is because it has certain advantages. Regular PE pipes can only be used for cold water below 40°C, but PE-RT pipes can be used for both cold and hot water transportation. In the 1990s, Dow Chemical was the first to successfully develop PE-RT, followed by SK, LG, and other companies that also developed their respective grades. These all belong to the first generation of PE-RT materials, abbreviated as PE-RTI. With the continuous development of PE synthesis technology, since 2000, Dow Chemical, Basell, and some Korean companies have successively introduced the second generation of PE-RT, abbreviated as PE-RTII. Compared to PE-RTI, PE-RTII has higher strength at high temperatures, better creep resistance, allowing thinner walls during use, saving raw materials, reducing costs, and increasing the diameter.

PE-RTII shows significant advantages at high temperatures

However, this advantage of PE-RTII can only be significantly reflected in high-temperature hot water environments. This can be seen in the size selection between PE-RTI and PE-RTII:

In the underfloor heating market, the monopoly of PEX pipes is gradually being broken

The size selection of PE-RT pipes depends on the conditions of the application environment. Under different usage conditions, the S value series used as design and usage criteria also differ. The S value is related to the pipe material size. Pipe materials with the same S value have the same size. That is, selecting the S value selects the pipe material size. However, pipes with different S values have different wall thicknesses. For example, φ20 PPR pipes used in cold water systems often select the S5 and S4 series, with wall thicknesses of 2.0mm and 2.3mm respectively; when used in hot water systems, they generally select the S3.2 and S2.5 series, with wall thicknesses of 2.8mm and 3.4mm respectively.

So, how are the sizes of PE-RTI and PE- RTII pipe materials selected in underfloor heating systems? ISO22391-2009, German standard DIN16833-2009, and the new national standard draft (Ministry of Construction standard CJ/T175-2002) have made relevant regulations. According to the data provided by these standards, we can see that the pipe material series numbers selected under the same design usage pressure for PE-RTI and PE-RTII are exactly the same, meaning the sizes are completely identical.

Why is this so? The main reason is that PE-RTII has more obvious advantages in high-temperature hot water environments, but in low-temperature underfloor heating systems, the improvement in strength compared to PE-RTI at low temperatures is not sufficient to reduce wall thickness, save raw materials, or increase the diameter. If it were in a high-temperature environment, this feature of PE-RTII would be significantly evident.

Currently, the domestic cold and hot water pipe market is mainly dominated by PPR pipes. Can PE-RT pipes further expand their influence with their current high-temperature resistance advantage and dominate the domestic cold and hot water market? We need to wait and see.