Floor heating features and installation rules

The hot water is not heated above 60 ° C as a heat medium, and the heating pipe is buried in the floor for low temperature radiant heating. In developed countries such as Europe and the United States, it has been widely used in the 1970s. The application area of ​​South Korea, Japan and other countries has accounted for more than 80% of the heating area. It has incomparable advantages with traditional heating methods. In the engineering design and construction, it is technologically advanced, economically reasonable, safe and applicable, and ensures quality.

1. Comfort, hygiene, health care, and improved quality of life. Radiant floor heating, indoor surface temperature is uniform, room temperature gradually decreases from bottom to top, giving people a comfortable feeling of warm feet and feet, in line with human physiological requirements, because there is no convective air, it is not easy to make dust, the indoor air is very clean, hot From the feet, improve blood circulation, promote the body's metabolism has a good health care function.

2, high efficiency and energy saving, expand energy use, not only protect the environment, but also reduce the cost. In the radiant heating environment, the heat is effectively concentrated in the active area of ​​the human body, the heat loss is small, the design temperature is 2 ° C - 4 ° C lower than the heating design temperature of the radiator, and the required heat medium temperature is 20 ° C - 30 ° C lower than the traditional heating method. . In addition to fully utilizing geothermal heat, waste heat and other energy sources, it also reduces heating heat loss, which can save about 30% of energy.

3. Good thermal stability. Since the ground floor and concrete layer have large heat storage and good thermal stability, the indoor temperature changes slowly under intermittent heating conditions.

4. Improve indoor floor utilization and facilitate indoor decoration. Since the radiator and its pipes have been eliminated, it is equivalent to an increase of 2%-3% of the use area, which is more convenient for decoration and living room layout, and saves the decoration cost.

5, floor heating is safe and reliable, low cost and long service life. PE-X tube is recognized in the world as a material that can be used continuously for more than 50 years. At present, the cost of floor heating and heating meters is lower than that of high and middle-grade radiators. Because the whole system is laid without leakage leakage, no regular maintenance is required.

6, can achieve "by household measurement, room temperature adjustment." The temperature of each room can be independently adjusted and controlled. Install a heat meter in front of each household water separator to achieve separate metering and charging.

7, a wide range of applications. Applicable to all kinds of houses, villas, hotels, restaurants, theaters, stations, swimming pools, office buildings, exhibition halls, libraries, shopping malls, shopping centers, airport runways, car parks, outdoor sports fields, ramps, melting snow, Aquaculture, planting greenhouses.

Brief introduction of cross-linked Polyethylene (PE-Xa, b) series of pipes

The main raw material used in the production of cross-linked polyethylene (PE-X) pipe is high-density polyethylene (HDPE) and composite formula cross-linking auxiliary materials. The pipe is extruded by a screw or a plunger machine, and can be divided into: There are four kinds of oxide cross-linking method (PE-Xa), silane cross-linking method (PE-Xb), electron beam cross-linking method (PE-Xc), and azo cross-linking method (PE-Xd).

PE-Xa, b pipe is made of polyethylene as the main raw material, and forms a chemical covalent bond between the molecular chains of polyethylene through cross-linking, so that the molecules form a three-dimensional network structure, which has excellent heat resistance and comprehensiveness. Mechanical and physical properties have become the material of choice for building interior and exterior; cold and hot water supply, floor heating system. It is regarded as a new generation of green pipe, which is the most economical and widely used pipe in the floor heating project in northern China.

material. PE-Xa adopts Korean technology, technology and raw material processing and manufacturing; PE-Xb pipe production technology and process are all based on German standards, and the main raw materials are all based on British local materials.

PE-Xa, b pipe characteristics and advantages

1. The applicable temperature range is wide, and the long-term use can reach 50 years.

2, the texture is solid and the toughness and high internal pressure resistance.

3, excellent resistance to chemical corrosion and ring stress cracking, can transport a variety of chemical fluids at high temperatures.

4. The surface tension of the inner wall of the pipe is low, so that the water with high surface tension is difficult to infiltrate the inner wall, which can effectively prevent the formation of scale.

5, non-toxic, non-mildew, no bacteria, health performance in line with the requirements of GB/T 17219-1998.

6. The inner wall of the pipe is smooth, the fluid flow resistance is small, and the hydraulic characteristics are excellent. The flow of the fluid under the same pipe diameter is larger than that of the metal pipe, and the noise is also low.

7, the bending performance is good, the wrong bending during the installation process can be corrected by the heat gun.

8, light weight, easy to install, easy to transport, construction operations save time and effort.

PE-Xa, b pipe application range

(1) Building hot and cold water systems.

(2) Air conditioning hot and cold water, water treatment pipeline system

(3) Central heating system for residential buildings.

(4) Radiant floor heating and air-conditioning systems for airports and urban traffic trunk lines.

Technical requirements for PE-Xa and b pipes

1. Execution standard: GB/T 18992.1-2003 GB/T 18992.2-2003 “PE-X pipe system for cold and hot water”.

2. Appearance:

1) The inner and outer surfaces of the pipe should be smooth, flat and clean, and there should be no obvious defects such as scratches, dents and bubbles that may affect the performance of the product.

2) There should be no visible impurities in the pipe wall. The surface color of the pipe should be uniform and no obvious color difference is allowed.

3) The end face of the pipe is cut flat and perpendicular to the axis of the pipe.

3, length:

Coil: φ16~φ32 Length 60~300m Straight pipe: φ16~φ63 Length 4~6m

Note: The batch size is large, and it can be produced according to the needs of customers.

Technical parameters of PE-Xa, b and PE-RT pipe radiant heating

1. Structural layer thickness: 90mm for public buildings and 70mm for residential buildings.

2, heat medium temperature: ≤ 65 ° C

3, the temperature difference between the supply and return water: 8 ≤ 15 ° C.

4. Working pressure: ≤0.8MPa.

5. When the structural layer bears the load ≥2000kg/m2, corresponding measures should be taken.

6. Install a filter on the water supply main pipe to prevent foreign matter from entering the pipeline.

7. Heating and heat dissipation is related to ground material, supply and return water temperature, pipe spacing, indoor design temperature and other factors. Conventional practice, pipe spacing 100mm-350mm, insulation material is 15-30mm composite polystyrene board, average water temperature 35-55 °C, indoor temperature 15-28 °C.

PE-Xa, b and PE-RT pipe construction and installation

First, preparation before construction

1. Organize the construction personnel to be familiar with the construction plan and design description of the project and related specifications, and stipulate and master the necessary construction techniques.

2. The used equipment and related equipment should be ready to ensure normal construction.

3, the construction site should be smooth and not allowed to have bumps, as well as other debris such as sand and gravel, the interface should be smooth and smooth, no obvious elevation deviation.

4. Temporary facilities such as construction electricity, water, material storage and release, can meet the construction needs.

Second, the construction sequence

(1) Check that all concealed works in the construction site area are completed.

(2) Clean up the site where PE-Xa, b and PE-RT pipe systems are laid.

(3) Laying a composite insulation layer.

(4) Lay PE-Xa, b and PE-RT pipes and lay them in the design cycle.

(5) Dispenser positioning installation.

(6) PE-Xa, b and PE-RT tube compression test.

(7) laying steel mesh (responsible by Party A)

(8) PE-Xa, b and PE-RT tubes are filled with pressure (0.4Mpa) to fill the concrete. (Responsible by Party A)

Third, the construction quality requirements

(1) In addition to the implementation of the floor heating design basis of the project, the construction and installation shall also comply with the “Code for Construction and Acceptance of Heating and Sanitary Engineering” (GBJ242-82) and related regulations.

(2) When PE-Xa, b and PE-RT pipes are laid, avoid cross work with other constructions on the same work surface.

(3) Before installation of PE-Xa, b and PE-RT pipes, carefully check the fitting tolerances of the appearance joints and remove dirt and debris inside and outside the pipes and fittings.

(4) PE-Xa, b and PE-RT pipes shall be laid at intervals according to the design drawings, and errors shall be avoided as far as possible. The PE-Xa, b and PE-RT pipes in the buried part shall not have joints.

(5) Paint, asphalt and other contaminants should be avoided in contact with the copper pipe fittings during the installation process.

(6) PE-Xa, b and PE-RT pipe supply and return water pipelines. After the distributor is completed, the flushing pressure test is carried out to confirm that the pipe distributor is clean and can be connected, PE-Xa, b and PE-RT pipes. Filters must be placed on the water supply line and checked regularly every year.

(7) In the heating floor structure, the polystyrene insulation layer has reached the heat insulation purpose when the thickness is 20 mm, and can prevent the heat conduction between the room and the room and has a sound insulation effect. Bean stone concrete can fix PE-Xa, b and PE-RT tubes, increase ground strength and better heat transfer.

(8) If the ground layer is under pressure of 2 tons/m2 or more, a steel mesh is placed on the upper part of the floor heating layer, which is placed 10-20 mm above the PE-Xa, b and PE-RT tube, and the mesh diameter is φ2-φ4 mm. The mesh distance is 150mm.

(9) In order to ensure the thickness requirement of the concrete layer of the pea stone, to prevent the overall temperature of the floor layer from being affected, the strength of the concrete of the pea stone is not lower than C20, the particle size of the pea stone is preferably not more than 8 mm, and the crack prevention is added to the concrete of the bean stone. Additives to enhance the compressive strength of the pea stone concrete layer and prevent thermal cracking, aging, and the addition of condensing agent in winter construction.

(10) Install the plastic staples at a distance of 0.5 m/piece, 0.25 m/turn at the turn, and a turning radius of >8 D.

(11) Personnel entering the construction site should wear soft-soled shoes. It is strictly forbidden to wear leather shoes and iron palm shoes. In addition to the special tools for construction, other irons are strictly forbidden. During the construction process, the workers should carefully handle the tools and prevent them from being properly protected. Pipe damage.

Fourth, the hydraulic test of the pipeline

1. After filling the pipeline with water, check the air tightness.

2. Test according to 1.5 times of the designed working pressure. After the pressure is stopped, the pressure drop within 15 minutes does not exceed 0.05Mpa, and no air leakage is acceptable.

V. Quality acceptance

1. Intermediate acceptance

After the PE-Xa, b and PE-RT pipe laying and distributor installation is completed, the test pressure is applied again after the concrete filling layer has been cured, and the construction unit will carry out the test with the supervision unit.

2, the total experience received

Total experience and acceptance conditions:

(1) Construction drawings, as-built drawings and design change documents.

(2) Factory certificate for major materials, parts, products and equipment.

(3) Intermediate acceptance records and engineering quality accident handling records.

(4) Hydraulic test records and concealed engineering records.

(5) Ground embedding records.

Sixth, system debugging

1. System commissioning should be carried out after the intermediate acceptance and the total experience.

2. Before commissioning, the pipeline system should be inspected and flushed first. Measures should be taken during the flushing process to prevent foreign matter from entering the system and to debug the hydraulic balance of the system water supply pipeline.

3. Water supply to the low-temperature floor radiant heating system, the water supply temperature is gradually increased from 55 °C to 55 °C, and it is not allowed to suddenly heat up for a short time.

4. Commissioning and checking the heating medium temperature control system to ensure that the low-temperature floor radiant heating system works within the design allowable range, and the maximum water supply temperature must not exceed 60 degrees.

5. The non-heating season is filled with water for the low temperature floor heating system.

6, low temperature floor heating system allows the use of pressure P ≤ 0.6Mpa.

Seven, finished product protection requirements

1. It is strictly forbidden to vigorously tap and impact on the heating floor where construction is completed; it is strictly forbidden to drill, open holes, and shoot nails on the ground or roof to endanger the safety of heating pipes.

2. In order to prevent the freezing of the floor heating system, it is forbidden to have water in the non-heating system.

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