Four bathrooms at home, with PPR insulation pipes with polyurethane insulation, solar water supply,

PPR insulation pipe, also known as "pipe in pipe", is composed of "three-step method". PPR insulation pipe is composed of high-density polyethylene outer protective layer, polyurethane rigid foam and PPR pipe. The directly buried PPR insulation pipe is a PPR pipe with a density of 60kg m3 to 80kg m3 of rigid polyurethane foam that fully fills the gap between the PP-R pipe and the high-density polyethylene outer protective layer pipe, and has a certain bonding strength, so that the PP-R pipe, PE high-density polyethylene outer protective layer pipe, and polyurethane insulation layer form a solid whole.

It has the characteristics of energy saving, beautiful appearance, convenient installation and connection, efficient thermal insulation, health and environmental protection. Working Pipe (PPR) Specifications of PPR Insulation Pipes: CJ T480-2015 "Prefabricated Direct Buried Insulation Pipes" standard was formulated and released on November 23, 2016, and came into effect on April 1, 2016, marking that the development of heating pipeline technology in China has entered a new starting point.

PPR insulation pipes are used in air energy hot water systems, solar hot water pipe systems, air compressor waste heat recovery systems, central air conditioning cold and hot pipe systems, HVAC projects and hot spring insulation pipes.

1. It depends on the distance between your hot water source and the water point, if the distance is too far, a lot of cold water will definitely be released. This problem is particularly acute when it comes to the supply of water from a central hot water system. If the water supply is dispersed, such as not having a bathroom and a water heater, there is no such problem.

2. From the time you describe a main hot water pipe divided into various layers, it should be a centralized hot water supply system (the so-called central hot water supply system). This water supply method should be a hot water return device, which is what you call a hot water circulation system. The specific method is to connect a return pipe from the end of the hot water supply to the bottom of the hot water supply source, and the cold water in the main pipeline is pumped to the hot water source to be reheated through the water pump circulation in the middle, so as to ensure that there is hot water after the faucet is turned on with water and electricity (because only the stagnant water of the main pipeline is discharged, there is still a small amount of stagnant water in the branch pipe when used).

The control of the circulating pump can be in the form of temperature, time, manual or water flow switch.

If you don't use hot water for four bathrooms at the same time, a 20mm one is enough.

7.Eight Commentaries on the Dream of Red Mansions, including Wang Xilian, Yao Xie, Zhang Xinzhi, Er Zhiren, Zhulian, Tu Ying, Xie Xijushi, and Hong Qiufan, edited by Feng Qiyong, edited by Chen Qixin, and based on Cheng Jiaben, the first edition of the Culture and Art Publishing House, July 1991. Jiangxi Education Publishing House reprinted it in August 2000 with a retitled "Eight Critical Criticism of Dream of Red Mansions".