Weak current College】 【floor heating design parameters.

<br> 1, the average temperature on the surface of the floor: <br> ① personnel often remain in the ground, use 24 ° -26 ° c, temperature upper limit and lower limit values 28 degrees centigrade. <br> ② personnel .short-term stays on the ground that the use of 28 ° -30 ° c to 32 ° c temperature limit value. <br> ③ No staff to stay on the ground that the use of 35 ℃ -40 ℃, 42 ° c temperature .limit value. <br> 2. for water temperature; <br> ① water temperature upper limit value of 60 ° c, 65 ° c and 70 ° c, 75 degrees centigrade, etc. From safety and service life, civil construction and water .temperature should not exceed 60 ° c. <br> ② backwater temperature should be less than or equal to 10 degrees centigrade. <br> 3. heat load: <br> ① comprehensive radiation heating of heat load, you should press the relevant specification .. To calculate the heat load by 0.9-0.95 correction <br> Coefficient or the indoor temperature value can reduce 2 degrees centigrade. <br> ② partial heating of heat load, shall be multiplied by additional factors. <br> Heating area and room .area ratio 0.550.400.25 <br> Additional coefficient 1.301.351.50 <br> 4. effective thermal surface: <br> Calculation of effective heat dissipation, must pay attention to the Interior equipment, furniture and floor coverings for effective heat dissipation area. < .br> 5. fill layer: <br> ① thickness not less than 50mm. <br> ② When more than 30m2 or should less than 6 m in length, fill layer to set the spacing is less than or equal to 6m, width is .greater than or equal to 5 mm expansion joint. <br> Larger, spacing may be appropriate to increase, but not less than 10 m. <br> ③ heating pipe through the expansion joints, yishe length is not greater than · adjustment flexible casing .. <br> 6. pressure: pressure should not be greater than 0.8MPa. If more than measures should be taken. <br> 7. speed of flow: <br> Accelerate the velocity in water should not be less than 0.25m / .s, no more than 0.5m / s. The same set with device for each loop plus <br> Heat pipe length should be as close as possible to, generally not more than the longest 100m, cannot exceed 120m. Each loop resistance not Super .to 30Kpa. <br> 8, insulation layer: pomelo plate structure layer should be set insulation, use PS plate, capacity ≥ 20kg/m3, thickness should not be less than 25mm. <br> A high-quality geothermal project, design drawings .is one of the most important link (no design drawings of the projects do not meet national standards for geothermal and cannot be left to subsequent maintenance of the data). Design is the investigation and the process of measuring room data, so the measurement accuracy of .data and survey the scene and in the design of an important link, it is reasonable to design water separator way, room pressure balance, heat balance, etc. <br> Heating system design <br> In residential building, radiant floor heating system should .be divided by households, the configuration system, water harvesting; indoor main room, Yi-loop arrangement heating pipe. <br> Connections in the same water, set the same diameter on the length of the loop heating tube should be as close as possible .to, and should not be more than 120m. <br> Heating arrangements should ensure that the principle of surface temperature uniformity, opt back into the fold type (Rotary), parallel (inline type). <br> Heating pipe laying pipe spacing, .according to the surface heat emission, indoor air temperature, average water temperature and the thermal resistance of surface heat transfer through computation. <br> The choice of heating pipes, heating system with actual design pressure and pipe of allowable stress designed ring, select method .can be selected with reference to Appendix D. <br> Heating water flow in pipe should not be less than 0.25m / s. <br> Water tap, set design and accessories <br> Each loop heating pipe inlet and outlet individually and separately ., the set is connected to the water. And set water diameter should be not less than the total for the return pipe diameter, and minutes, set the maximum water velocity is not greater than 0.8m / s. Each minute, set water branch should .not be more than 8 road loop. For each branch loops back to the water pipe should be set to shut off valve. <br> In water separator before the water connection pipe, downstream should install valve, filter, heat metering device (with heat .metering systems) and the valve. In the water after the backwater connecting pipe, you should install can turn-off control valve, balance valve if necessary. <br> In the Shui total fles and set water total should be set up between the outlet .pipe, bypass pipe, bypass pipe, valve, guarantee should be set on the heating pipe system flushing water does not flow into the heating pipe. <br> Water tap, set should be set manually or automatically discharge valve and discharge valve. <br .> Thermal measurement and temperature control <br> New residential hot water heating system should be set based heat measurement and temperature control device. <br> Low-temperature hot water floor radiant heating system of household heat metering should meet the following requirements: <br .> 1. should adopt common legislation in the form of independent system of household; <br> 2. heat meter before setting filters; <br> 3. the water heating system should be consistent with the existing standards of the industrial countries of boiler water .quality (GB1576) requirements; <br> 4. sharing of risers and entrance to set in the pipe shaft; pipeline well advised to adjacent stair or outdoor public spaces. <br> 5. each pair pooled risers in each layer of households should not .be more than 3. <br> Radiant floor heating system indoor temperature control you can select one of the following lists: <br> 1. in the heating and water, set the joint action sets the tuning performance, good road valve manually adjusted to .control indoor temperature (recommended) <br> 2. in the heating and water, set the junction, tap Settings, remote-control valve for self-operated or electrodynamic type constant temperature through the room temperature controller controls the corresponding loop control valve on the .indoor temperature remains constant. Control valve can also beBuilt into the water. Use of electric control, room thermostats and tap, water harvesting should be embedded between the wires. <br> 3. in each room heating (heating tubes along wall elevation to 1.4 .m) self-operated temperature control valve on the device, keep the room temperature constant. <br> Radiant floor heating system should be set in the heat source for heating temperature control device. <br> System design: <br> 1, according .to sources of heat means the entire loop length. To Tianjin area, central heating, you can use the longest loop 0 - 90m, separate heat source, the user can select a maximum of 50 - 60m. <br> 2, surface structure, .external heat quantity, possible radiant floor heat does not meet the heat load, causing the room not hot. <br> 3, according to the building structure, toward different, should use different thermal loads, if you choose to use the same, you .may receive the design heat load is less than the actual room heating load, causing the room not hot. <br> 4, designers should be based on the heat load selected appropriate coil spacing. Spacing is too large, the radiation heat quantity is small ., no heat may occur; <br> 5, heating loop exhaust device is not set, causing choking noises, system not hot. <br> Construction area: <br> 1, construction quality, brutal death of construction, pipe bending, flattening .behavior, resulting in poor flow, resistance increases. <br> 2, pipe laying without carefully clean up debris inside the tube, clean, pipe plug. <br> 3. pipe spacing does not meet the design requirements. <br> Why not .have hot and cold? <br> System design: <br> 1. loop line is too long and the length of each loop is not uniform; <br> 2, uneven spacing; construction: <br> 1, and the construction trades ., leveling the ground. Pipe exhaust impeded; <br> 2. human-caused death coil bending, flattening, the water flow, flow is different. <br> Why surface cracking? <br> Since civil professional settlement joint set unreasonable, causing .the entire ground settlement: <br> Heating insulation compliant in the structure are not settlement <br> Concrete C20: label does not meet the <br> Fill layer strength, thickness does not meet the requirements; <br> No added steel mesh of .construction technology, linear expansion direction uncertain <br> Concrete fill layer curing period is short, less than 7 days; <br> Heat source too hot, too hot to local ground heat very diao; valid release. <br> Indeed this flooring and .parquet floor heating should be aware of what to do? <br> Solid wood flooring is the natural wood, easy to deformation, flooring hardness in solid wood flooring, after reconstruction, the constituents have gum, difficult to deformation. Solid wood flooring deformation is .its own humidity, laminate flooring is superior to wood flooring. <br> Solid wood flooring has no ventilation is the main reason causing cracking, only the humidity and air flow control to solve cracking. <br> <br> <br> <br .>.