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If other materials, such as PE-RT, PP-R, and PP-B, in accordance with the requirements of 3.4.2 of the "Technical Specification for Radiant-fired Heating", the amount of heat dissipation and downward heat transfer loss per unit of floor area shall be determined by calculation. Refer to the "3.4 Calculation of Radiated Heat Discharge" for accurate calculations. In fact, in the absence of relevant professional information, Appendix A can also be used as reference data for other pipe designs. For example: A 20°C room has a calculated thermal index of 40 W/m2 (north), and the ground floor is a wood floor. When the average water temperature is 40°C, when the average water temperature is 40°C, a DN15 (20 pipe) PE-X can be used. Check Appendix A.1.3 to determine the amount of heat dissipation and downward heat transfer loss per unit area of ​​the ground. As shown in the following table (this is a part of Appendix A.1.3), the spacing 300 is sufficient (66.8-26.3=40.5 meets the requirement of 40 W/m2 for the required room heat).
Incidentally, when the floor heating coil is selected, after the pipe and the pipe diameter are determined, the wall thickness is selected according to the design operating temperature and pressure of the heating system, so that the floor heating pipe is selected. Please refer to "Technical Specification for Radiant Floor Heating" "Appendix B Selection of Heating Pipes" for this part. Here is an example: a typical six-story residential building, with an average water temperature of 40°C, a PE-RT tube with a wall thickness of 2mm and DN15 is sufficient.
When heating coils should pay attention to the following points:
(1) The ambient temperature of the construction should not be lower than 5°C; in the construction under the environment below 0°C, the temperature shall be taken at the site.
(2) During the construction of the ground radiant heating project, it is forbidden for people to step on the heating pipe.
(3) During the construction process, paint, asphalt or other chemical solvents shall be prevented from contacting the surface of the contaminated heating pipe.
(4) The heating coil is laid on the steel wire surface. The length of the tube is determined according to the length of each circuit, and one circuit is used as much as possible for one circuit. There should be no joints in the buried part of the coil laid under the ground.
(5) The heating pipes shall be laid in accordance with the pipe spacing and orientation calibrated on the design drawings. The heating pipes shall be kept straight. The heating pipes of the same passage shall be kept horizontal to ensure the flatness of the pipe top is ±5mm. The installation error of the pipe spacing should not exceed 10mm. Before laying the heating pipe, the selection of heating pipe, pipe diameter and wall thickness shall be checked against the construction drawings, and the appearance quality of the heating pipe shall be inspected. No impurities shall be allowed inside the pipe. When the installation of the heating pipe is interrupted or completed, the opening should be closed at any time.
(6) The heating tube is fixed firmly with a tie and a staple, and it is strictly prohibited to have a tilted portion.
(7) When the heating pipe is installed, the pipe should be prevented from being twisted; when the pipe is bent, the top of the arc should be limited and fixed with a pipe clamp, and no “deadfold†shall occur; the bend radius of the plastic pipe shall not be less than 6 times the pipe outer diameter.
(8) The cutting of the heating pipe should use special tools. The incision should be flat and the fracture surface should be perpendicular to the axis of the pipe. It is forbidden to split the heating tube by using electricity, gas welding, hand saws and other tools.
(9) Fixing cards should be set at both ends of the elbow of the heating pipe; the spacing between the fixing points of the heating pipe should be 0.5-0.7m from the fixed point of the straight section, and the spacing between the fixing points of the curved section should be 0.2-0.3m.
(10) When passing through the doorway, expansion joints and settlement joints, casing shall be installed with the length of the casing ≥ 200mm. The casing is two larger than the coil and filled with insulation fillets.
(11) In the areas where the water separators, water collectors, and other local heating pipes are arranged closely, when the pipe spacing is less than 100mm, the outside of the heating pipe should be provided with a flexible sleeve (usually PVC or HDPE). Corrugated casing) and other measures. In order to prevent cracking on the ground, 0.5-1.0 cm thick bezoar concrete should be poured in the dense pipe area to ensure the compaction.
In general, the diameter of floor heating coil does not need to be calculated. In most residential buildings, the diameter of De20 (DN15) (20 tubes) can be used to meet the requirements. Check the “Technical Specification for Surface Radiant Heating†in Appendix A “The Heat Dissipation of the Unit Ground Area and the Heat Transfer Lossâ€. Select the appropriate average water temperature and the distance between the heating coils to meet the requirements. Please note: Appendix A gives the calculation conditions when the nominal diameter of the heating tube is 20mm, the thickness of the filling layer is 50mm, the thickness of the polystyrene foam insulation layer is 20mm, and the temperature of the return water is 10°C when the PE-X tube or PB tube is used. . The table gives the “heat loss and downward heat transfer loss per unit floor area†in the case of cement or ceramics, plastic materials, wood floors, and thick carpets.
July 02, 2021