What is Low-temperature hot water floor radiant heating ?
Uses hot water not higher than 60°C as a heat medium to circulate in a heating tube buried in the filling layer below the ground, heating the entire floor, and heating the interior through the ground with radiation and partial convection heat transfer. Heating method.
What are the advantages of floor radiant heating?
1, healthy and comfortable environment
2, energy saving and environmental protection
3, household measurement, room temperature adjustment
4, improve the property grade
5, good thermal stability, long life
How to explain the floor heating can provide a healthy and comfortable environment?
With the development of society, people have higher and higher requirements for the environment, especially the living room environment. The traditional heating methods mostly use convection to heat indoor heating, causing indoor dust to fly, and the heat is unevenly distributed. Causes indoor air to dry. Radiant floor radiation heating is heated by radiation, and the heat is distributed evenly from bottom to top to form the ideal room temperature for human body heating, giving a feeling of warm and comfortable body and refreshing and pleasant head. At the same time, due to the reduced room temperature and moderate air humidity, the nasal mucosa and respiratory tract can be prevented from drying out, and the accumulation of dust and the spread of bacteria can be avoided.
How to explain floor heating has the function of energy saving and environmental protection?
Low-temperature floor radiation heating, the entire indoor floor as a cooling body, indoor air temperature can be lower than other heating methods 2-3 °C, only this one can save about 10%. In addition, it can also use geothermal heat, industrial waste heat, etc. as the heat source for floor radiant heating, and the low-temperature transport of heat medium also reduces the heat loss during the transfer process.
Why floor heating can be measured by households, room temperature?
Each household is a system of floor heating, and each room has a loop in each room, so it can fully reflect the residents' self-control of hot commodity consumption, and it also meets the technical requirements of “measured by households, room temperature adjustment†proposed by the country. .
Floor heating from which aspects can improve the quality of the property?
As the low-temperature floor heating heating water heating coils are hidden in the floor, do not take up the use of the room area, and user-friendly interior decoration, and can make the interior decoration to maintain the original color longer. Convenient Property Management Low-temperature floor radiant heating technology adopts plastic pipes, so it will not rust and scale. It is easy to maintain and can extend the life of the boiler.
Why is the thermal stability of the floor radiant heating good, long life, how many times the radiator life?
Since the ground layer and the concrete layer have large heat storage and good thermal stability, the indoor temperature changes slowly under intermittent heating conditions. The world-accepted Poly tube can be used continuously for more than 50 years, which is 6 times that of ordinary radiators.
What are the main materials in low temperature hot water floor radiant heating system?
Main materials of hot water surface radiant heating system: heating pipe, diverter (including connecting pieces, etc.), heat insulation plate and auxiliary materials.
Which pipes can be used as low temperature floor radiant heating pipes?
From the perspective of product performance indicators, PEX, PP-R, PE-RT, PB four kinds of pipes can meet the requirements of ground radiant heating, both at home and abroad have mature, extensive application experience, ground heating pipe is an application area The special pipe is characterized by the fact that the entire pipe network is buried in the ground. If there is damage and leakage during installation and use, the resulting damage is relatively large and maintenance is very difficult. Therefore, the requirements on the safety and stability of the pipe are high. At the same time, the repairability of the pipe network system must be considered. From a comprehensive cost-effective point of view, PE-RT, PE-Xb tube is more suitable for China's floor heating tube market application requirements.
Floor heating supply, return water temperature is generally how much?
Water supply temperature: 60-50°C Return water temperature: 50-40°C
What is the temperature difference of the return water?
Supply water temperature difference should not be greater than 10 °C
Why shouldn't floor heating water supply temperature be too high?
Under the premise of being used for 50 years, floor heating pipes can withstand high temperatures and supply hot water. However, since the cement floor of the building floor exceeds 60°C, the strength will be reduced and the service life of the building will be affected.
How long is the best for each warm loop?
The length of each group (road) heating pipe connected to the same sub-collector and water collector should be as close as possible, and the overall range is 70-120 meters. However, each return-loop is guaranteed to be 90 meters and the longest is not to exceed 120 meters.
What is a water distributor?
Fractional water heater (Heating medium collective and distributive unit)
There is a cylindrical pressure-receiving device with a total inlet (outlet) and a plurality of sub-exports (inlet), and a bleeder valve and each access valve are configured to control the system flow and flow rate.
Low-temperature hot water floor radiant heating system should have an independent sub-collector, and what requirements should be met?
1 At least one set of water collectors should be set up for each household in a dwelling; there should be no more than 8 branch roads for each sub-assembly;
2. The total inlet and outlet pipes of the sub-collector and the collector, the nominal diameter is generally dn32mm. When the heated pipe is 8 groups (roads), the flow rate of the heat medium in the pipe can not exceed the maximum allowable flow rate of 0.8m/s.
3. The diameter of the sub-assembly should be greater than the total supply and return pipe diameter;
4, points (collection) should be higher than the floor heating pipe, and configure the exhaust device;
5, home total supply, return pipe and each supply and return branch road should be equipped with valves, valves should have the function of manual or automatic adjustment of room temperature; the use of centralized heating systems, household heat meters should be installed, do not have the conditions The person should reserve the epitope.
What are the ground structures for ground radiant heating?
Radiant floor heating floor structure: ground floor, leveling layer, waterproof layer, filling layer, heating pipe, heat insulation layer, floor and other components.
What is the ground floor, screed, waterproof, fill, insulation, and moisture barriers?
1, Floor surface course (finished floor)
The building ground is directly subjected to various physical and chemical surface layers.
2. Troweling layer
The textured layer is smoothed on the filling or structural layer.
3, waterproof layer (Waterproofing layer)
Prevents the formation of water and gas on the ground.
4, Filled layer (Filled layer)
The structural layer used to insulate the heating pipe on the floor surface of the floor is used to protect the equipment and make the ground temperature uniform.
5, Insulating layer
Used to block heat transfer and reduce the ineffective heat loss of the structural layer.
6, Wet proofing layer (Wet proofing layer)
Prevent the formation of moisture on the foundation of the building or floors through the ground.
What are expansion joints, wire mesh, tie-cards, and jackets?
1ã€Contraction joint
Compensate construction joints for expansion or contraction such as filling layers, upper structural layers, and ground layers.
2. Wire netting
A low carbon steel wire welding member for fixing a heating tube.
3, strapping (Belting)
Fix the heating tube to the plastic band on the wire mesh.
4, Compression fittings (Compression fitting)
The heating pipe is inserted into the pipe core, and the C-type copper ring placed outside the pipe is tightened by the compression nut, and a sealing pipe is used to complete the sealing, which is commonly used in the PE-RT pipe and sub-collector. connection.
How to choose insulation material?
Uses materials with low thermal conductivity, low moisture absorption, flame-retardant or non-flammable, sufficient load-bearing capacity, and does not contain sources of inoculum, volatile odors, or potentially harmful to health. General insulation panels should use polystyrene foam, its quality should meet its physical properties should meet the following requirements:
The apparent density should not be less than 20Kg/m3; The thermal conductivity should not exceed 0.041W/(m?k); The compressive stress should not be less than 100KPa; The water absorption should not exceed 4%; The oxygen index should not be less than 30; After 70°C 48h The dimensional change rate is not more than 5%; the fusion (bending deformation) is not less than 20mm.
Note: When using other insulation materials, other physical properties than density should be equivalent to the above requirements.
How to enhance the overall strength of the insulation board?
The surface of the insulating board can be individually treated as follows:
1. Lay a vacuum aluminized polyester film surface layer;
2. Laying glass cloth aluminum foil surface layer;
3, the laying of low-carbon steel wire mesh;
How to choose heating pipe and fittings?
The color of heating pipes and fittings should be the same, uniform color, no decomposition and discoloration.
The inner and outer surfaces of the heating tube should be smooth and clean. No delamination, pinholes, cracks, bubbles, flaking, marks, and inclusions are allowed, but minor, partial, outside diameters and wall thicknesses are not allowed. Scratches, pits, indentations, and spots. Minor straightening and turning marks, fine scratches, oxidized colors, darkness, water marks, and traces of oil may not be used as a basis for scrapping.
How to transport and store pipes and fittings?
Pipes, fittings and heat-insulated panels shall be handled with care and care when they are transported, handled and transported. They shall not be subject to violent collisions and impacts from sharp objects, and shall not be thrown, thrown, rolled or dragged, and contact with oil shall be avoided.
Pipes, fittings and heat insulation plates shall be stored in a well-ventilated warehouse at a temperature not exceeding 40°C. The distance from the heat source shall be no less than 1m. It shall be stored in the open air. The yard shall be kept clean and leveled to prevent mud and The debris enters the tube.
PP-R floor heating pipe, what is the hot melt connection temperature?
When the fusion splicer is heated to 260°C (green light), pipes and fittings are pushed into the fusion splicer at the same time and heated according to the “splicing scheduleâ€.
How to choose the thickness of thermal insulation?
Thermal insulation between floor slabs
20mm
Insulation layer on the floor adjacent to soil or outdoor air
40mm
Insulation along the inner perimeter of the exterior wall
20mm
How to choose the material of the filling layer?
The material of the filling layer should adopt C15 bean dregs, the particle size of the bean grain should not be greater than 12mm, and suitable amount of anti-cracking agent should be infiltrated. The thickness of the filling layer should be 50mm. If the ground load is greater than 20KN/m2, the structural designer should take reinforcement measures.
How do high-rise buildings design floor heating?
When the building height exceeds 50m, the heating system should adopt the method of designing vertical partition heating. The main purpose is to reduce the pressure on the heat dissipation equipment and fittings in the system (not more than 0.8MPa) to ensure the safety of the heating system. run.
What is the most comfortable temperature for a low-temperature floor radiant heating surface?
Environmental conditions Personnel long-term stay area Personnel short-term stay area No personnel stay area Bathroom and swimming pool
Suitable range 24-26°C 28-30°C 35-40°C 30-35°C
Maximum limit 28°C 32°C 42°C 33(EN1264)°C
What is the flow rate of hot water in the heating pipe?
The flow rate of the heat medium in the heating pipe should be 0.35-0.5m/s and should not be less than 0.25m/s.
What are the layout of heating pipes?
According to the principle of ensuring uniform ground temperature, the parallel type (in-line type) and foldback type (rotary type) should be selected.
The rooms with obviously uneven heat loss are generally close to the outer window and the outer wall is piped to compensate for the heat loss in the room.
What is the distance between heating pipes?
The spacing of the heating pipes shall be determined by calculation based on the ground heat dissipation, indoor design temperature, average water temperature, and heat transfer resistance. When arranging the heating pipes, the arrangement should be based on the distribution of the heat loss in the event, but the maximum distance between the pipes should not exceed 300mm. (Pipe spacing should be 100-300mm, heating pipe should be 100mm from the inner surface of the outer wall)
Heat pipe design pressure is how much?
Heating pipe design pressure 0.8Mpa.
The role of the bypass pipe between the manifold and the water collector?
A bypass pipe should be installed between the water collectors and the water collectors. It should be able to perform the overall flushing of the heating pipe system without the water flowing into the heating pipe.
Under what circumstances need cement mortar reinforcement?
When the radiant heating system is laid on the soil, a cement mortar reinforcement layer shall be provided below the heat insulation layer;
Where do I need to install a waterproof layer?
When the radiant heating floor is set on the floor of a damp room (bathroom, kitchen, swimming pool, etc.), a waterproof layer should be used above the filled floor.
What is the thickness of the filling layer?
The heating pipe should be filled with pebble concrete. The thickness of the filling layer is equal to the outer diameter of the heating pipe. The cement mortar leveling layer above the filling layer is not less than 30mm. When the live load on the ground is greater than 20 KN/m2, design measures shall be taken to determine the reinforcement measures.
Low temperature hot water floor radiant heating system installation project, what conditions should be met before construction?
1. The design drawings and relevant technical documents are complete;
2, there is a more complete construction program, construction organization design, and has been technical disclosure;
3. The construction has ready conditions for water supply or power supply, and temporary measures for storing and releasing materials;
4. The civil engineering professional has completed the painting inside the wall (without the ground floor), the outside windows and the outside doors have been installed, and the ground has been cleaned; the kitchen and toilet should be closed and tested after acceptance.
5, a variety of installation materials have been inspected, the accompanying specifications and certificate should be complete.
In the construction process, how to deal with inconsistent with the design drawings?
During the construction process, in case of any inconsistency with the design drawings, or other changes, they should be negotiated with the designer and the relevant person in charge. After confirmation, they can be constructed, marked on the drawings and made changes.
Low temperature hot water surface radiant heating construction site, minimum ambient temperature standard?
In the construction of low-temperature hot water surface radiant heating projects, the ambient temperature should not be lower than 5°C. When PE-RT tubes are used as heating tubes, the ambient temperature should not be lower than 0°C.
How much should the heating temperature be controlled?
The quality control of hot melt connection: The temperature of hot melt heating should be controlled at about 240°C. It is forbidden to cause the shrinkage of the pipe due to the time-out over-temperature welding, and the phenomenon that the welding temperature and time is not enough to connect.
What should you watch out for when installing or completing the heating pipe?
Heating pipe installation interrupted or completed the opening should be blocked at any time.
How to determine the bending radius of the heating tube?
The bending radius of the heating tube should not be less than 6 times the tube outer diameter.
Is there a joint in the buried part of the heating pipe laid under the ground?
There should be no joints in the buried parts of the heating pipes laid under the ground.
After the construction acceptance, it was found that the heating pipe was damaged. How to solve it?
Although the heating pipe embedded in the filling layer should not have joints, but after the construction acceptance, it was found that the heating pipe is damaged, and when additional joints are needed, heat-fusion connections or ferrule-type copper pipe joints are used depending on the heating pipes of different materials. Pipe joints should be added external anti-corrosion and protective measures.
What are the fixing methods for heating pipes?
The following fixing methods can be used separately:
1. Fix the heating pipe directly on the heat insulation board with composite surface layer with a fixed special plastic card.
2. Bundle the heating tube with a nylon cable tie on the wire mesh laid on the surface of the heat-insulating layer.
3, directly stuck in a special pipe rack or tube card laid on the surface of the thermal insulation layer.
How much should the distance between the fixing points of the heating pipes be located?
The distance between the fixed points of the heating pipe, the fixed interval of the straight pipe section is 0.4-0.6m, and the fixed point spacing of the curved pipe section is 0.2-0.3m.
What problems should be paid attention to when connecting the heating pipe to the ground, the water collector device and the pipe fittings?
The heating pipe shall be connected to the ground and the water collector device and the pipe fittings. It shall be kept vertical and vertical, and the elbow shall not expose the ground decoration layer. The surface of the heating pipe shall be exposed from the ground to the exposed pipe section between the ball valve and the lower part of the water collector. The outside shall be covered with a hard plastic casing.
What problems should be paid attention to in the places where the water collecting devices and the other local heating pipes are arranged more closely?
When the distance between pipes and water heaters and other local heating pipes are densely arranged, when the pipe spacing is less than 100mm, heat-insulating measures such as flexible sleeves shall be provided outside the heating pipes, or additional steel mesh shall be added to the filling layer to prevent cracks on the ground. .
How to deal with the heating pipe crossing the expansion joint of the concrete filling layer?
When the heating pipe crosses the expansion joint of the concrete filling layer, a uniform flexible sleeve or plastic pipe with a length of not less than 100 mm shall be provided.
When installing the water collector, what should be noted?
Sub-water collectors should be installed before the laying of heating pipes.
1. When installing horizontally, it is generally advisable to install the water separator on it. The water collector is installed below. The center distance should be 200mm. The center of the water collector should not be less than 300mm from the ground.
2. When installed vertically, the lower end of the collector and collector should be no less than 150mm from the ground.
What conditions should be available for construction of a concrete filling layer?
1, should be installed in the heating pipe, water pressure test and pipe system under pressure.
2. All edge insulation bars at the vertical part have been installed.
3, insulation layer has been covered with a suitable cover.
4. The required expansion joint has been specified by the designer and has been arranged by the heating or filling layer construction company.
5, through the hidden project acceptance.
What is the system water pressure during the construction of the concrete filling layer?
The construction of the concrete filling layer shall be undertaken by the civil construction party. The installation unit shall cooperate closely to ensure that the water pressure in the heating pipe is not less than 0.6Mpa. During the curing process, the system shall maintain not less than 0.4Mpa.
What thermal expansion compensation construction measures are used for the concrete filling layer?
1. When the area of ​​the ground surface exceeds 30m2 or the length is more than 6m, the filling layer shall be layered and skipped, each cell shall be ≤ 6m, and the expansion joint shall be ≥ 5mm wide.
2, at the junction with the internal walls, columns and passing doors, leaving a width of ≥ 5mm expansion joints.
3, expansion joint filled with elastic expansion cream or polyethylene foam strips.
4, expansion joints should reach the ground floor. Expansion joints must separate building components from the upper edge of the insulation to the upper edge of the floor covering across the entire section.
How long is the curing cycle of the concrete filling layer? After the expiry of the conservation period, what issues should be noticed?
The curing period of the concrete filling layer should not be less than 21 days. After the maintenance period expires, the ground should be properly protected. It is prohibited to run heavy loads, high-temperature baking, direct high-temperature objects, and high-temperature heating equipment on the ground.
What materials should be used for low temperature hot water radiant heating decorative floor?
1, cement mortar, concrete floor
2, tile, marble and terrazzo floors
3. Composite wood flooring, solid wood composite flooring and heat-resistant solid wood flooring that meet national standards
Before the construction of the ground floor, it should be determined whether the filling layer can reach the required dryness of the ground floor before construction. In addition to the requirements for civil construction design drawings, the ground floor construction should comply with regulations.
1. During the construction of the ground floor, no filling, chiseling, cutting, drilling and nail filling shall be allowed, and no objects shall be wedged into the filling layer.
2. The construction of the ground floor must be carried out after the concrete reaches the required strength.
3, the ground floor (stone, tile) at the junction with the wall, column, etc., should be left 5-8mm wide expansion joints (the last kick to block); laying wood flooring, should stay ≥ 14mm expansion joints.
4. When the wooden floor is used as the ground floor, the wood must be dried and the floor should be pasted after the filling layer and the screed are completely dry.
Is there a water stop wall for kitchen and toilet construction?
Bathrooms and kitchens shall be fitted with civil engineering professionals with a height of 60-80mm and a wall thickness of 120mm. Waterproofing shall be done on the inner side of the waterstop with professional civil engineering.
After construction workers enter the construction site, what safety precautions should they pay attention to?
1. After the construction personnel enter the construction site, they must abide by the site's safety rules and regulations, accept the supervision of the safety officer, and conduct civilized construction.
2. There must be two people present at the open fire operation so that people can go off and lose power.
3. When using electricity, it should be operated by a professional electrician.
4, is strictly prohibited after drinking. Special workers are responsible for special jobs.
5, construction workers must wear work clothes. When welding, you must master the essentials to avoid burns.
What should be checked and accepted and conclusions should be made when each specialty or process is handed over or hidden?
1. The quality of pipelines, manifolds, manifolds, valves, fittings, insulation materials, etc.;
2. Installation quality of pipes and fittings;
3, concealed before the hydraulic pressure test acceptance;
4, the original ground, filling layer, ground layer construction quality inspection and acceptance;
5. Check and acceptance of intermediate transfer quality;
6. Check and acceptance of hidden hydraulic pressure test;
7, rinse inspection and acceptance;
8, loop, system commissioning commissioning.
Which of the following should be included in the construction organization design or construction plan?
1, engineering construction;
2. Main points of construction drawing design, pipeline layout drawing, node diagram, sectional drawing of original ground to ground floor, position of expansion joint, etc.;
3, the performance of major materials, equipment, technical specifications, specifications, models, etc., and the preservation of storage measures;
4, the construction process and the professional construction time plan;
5. Construction and installation quality control measures and acceptance criteria, including: installation quality of main materials and equipment, construction quality of original ground, filling layer and ground layer, hydraulic pressure test, comprehensive inspection before concealment, loop, commissioning of the system for trial operation, Completion acceptance and so on.
6, construction schedule, workforce plan;
7, safety, environmental protection, energy-saving technical measures.
Is the main material used in the hot water surface radiant heating system project required quality certification documents?
It is necessary that the main materials, equipment components, valves, fittings, and heat insulation materials used in the hot water surface radiant heating system project must have Chinese quality certification documents. The specifications, models, and performance technical indicators should comply with the relevant national technical standards. When entering the site, inspection and acceptance shall be done and checked and confirmed by the supervision engineer.
How to check the quality of valve and manifold assembly before installation?
Prior to installation of the valve and manifold assembly, strength and tightness tests shall be performed. The test shall be randomized by 10% and not less than one in each lot (same grade, same model, same specification). For bypass valves installed at the inlet of the manifold, the outlet of the manifold, and the bypass pipe, strength and tightness tests shall be performed one by one and shall be all qualified.
Why wood floor cracks, what causes it?
There are many phenomena of wood floor cracking. There are roughly three reasons for this:
In the first case, wood flooring is of poor quality and has not been subjected to stringent drying. As a result, the water content is too high. After use, the wood shrinks and cracks occur as the moisture content decreases. In fact, this type of floor, even if it is used in a room that is not floor-heated, will also be cracked.
The second case is the premature paving of wood floors where the filling layer is not yet completely dry. After the wooden floor is laid, the moisture in the bowl is still evaporating, making the moisture content of the originally dry wood floor higher, and thus expanding the curls.
In the third case, when the wooden floor is laid, no expansion joints are left at the intersection of the floor, the wall, the column, etc. Therefore, when the floor is heated and expanded, there is no way to compensate for the expansion displacement, so that the drum is generated.
In fact, the use of hot water surface radiant heating, the floor temperature will not exceed 40 °C, this temperature is equivalent to the summer temperature in some areas, it is much lower than the temperature of wood drying, so the floor heating itself is not possible on the wooden floor Cause harm.
Valve strength test pressure standard?
The strength test pressure of the valve is 1.5 times the working pressure; the tightness test pressure is 1.1 times the working pressure, and the duration of the valve strength and tightness test with a DN of less than 50 is 15 seconds, during which the pressure should remain unobstructed, and the housing, Filler and sealing surface no leakage.
Do you need to accept before filling the fill layer?
After the heating tube of the ground radiant heating system is installed, before the filling layer is filled, the construction unit shall, in accordance with the requirements of the hidden project, carry out the intermediate acceptance by the construction unit and the supervision unit.
Hot water surface radiant heating system, in the middle acceptance, which items must be tested, and make a conclusion?
1. Whether the insulation layer thickness, paving, and material physical properties meet the requirements.
2. Whether the material of the heating pipe, the pipe outer diameter, the wall thickness, the pipe spacing, the bending radius, etc. meet the design regulations, and whether the fixing is reliable or not.
3. If there is any leakage between the heating pipe and the heating pipe, and the junction and the water collector.
What are the requirements for hydrostatic testing?
1. Hydraulic pressure test should be performed after system flushing.
2. The hydrostatic test shall be performed on a unit-by-group or loop-by-loop basis for each component and collector.
3, hydrostatic test should be carried out twice, respectively before pouring concrete and filling layer curing period.
4, the test pressure should be 1.5 times the working pressure, and should not be less than 0.6Mpa.
5. Inspection method: Under the test pressure, regulate the pressure 1h, observe the pressure drop, if the pressure drop is less than 0.05Mpa,
It is considered qualified.
6. The hydraulic pressure test should adopt the manual pump to raise the pressure slowly. During the pressure increase process, it is necessary to observe and check whether there is any leakage.
7. When there is a possibility of freezing under pressure test, the water in the tube should be dried in time after the test pressure is completed.
8. It is not appropriate to use a pneumatic test instead of a hydrostatic test.
How to flush and debug the piping system?
Before the commissioning, the pipeline system shall be flushed. The flushing shall be performed after the main supply and return pipelines are flushed outside the sub-collector and the water collector, and then the flushing of the indoor surface radiant heating system is performed, and then the hot water is adjusted for debugging. The flushing and debugging of hot water should be passed through the filter first and then through the procedure of the water separator in order to prevent impurities in the water from entering and remaining in the heating pipe network.
Ground radiation heating system is not commissioned. Can it be used?
Ground radiant heating systems are not commissioned and are strictly prohibited.
What steps are required for the hot-pass test run of the hot water surface radiant heating system?
The hot-pass test run of the hot water surface radiant heating system must be performed after the ground floor is completely dry (at least 21 days after the completion of the filling layer). During the initial heating, the temperature of the hot water should be gentle, and the temperature of the water supply should be controlled at about 10°C higher than the ambient temperature, and should not be higher than 32°C. At this water temperature, it should be run continuously for 48h; after every 24h, the water temperature is increased by 3°C until it reaches 60°C. At this temperature, the heating pipes connected to each component and the water collector should be adjusted one by one so that the temperature of each room approaches the interior design air temperature.
What are the evaluation criteria for the heating effect of ground radiant heating systems?
The heating effect of the ground radiant heating system shall be based on the temperature indicated by the wet-bulb thermometer at 1.5m from the center of the room as the basis for evaluation and assessment.
How to debug when there is no heating condition?
When heating conditions are available, commissioning should be carried out before acceptance of the completion; when there is no heating condition, consultations with the engineering construction unit may be postponed for commissioning.
What information should be submitted when the project is completed and accepted?
1. Construction drawings, as-built drawings, design documents, and design change documents.
2, construction plans and system installation site records.
3, the main material, products and parts factory certification and quality inspection report.
4. Hidden project acceptance and intermediate acceptance records.
5. Test pressure and flush records.
6, project quality inspection and assessment records.
7, heating system commissioning records.
Heating system debugging, completion acceptance which first?
Completion acceptance should, in principle, be carried out after commissioning of the heating system.
Complying with the acceptance criteria, the acceptance criteria can only be accepted through completion.
1. The completion quality meets the design requirements and the relevant provisions of this technical manual.
2, no leakage of pipes and components.
3, the valve is open and closed tightly.
What are the main functions of the filling layer?
The role of the filling layer is mainly two: one is to protect the heating pipe; the other is to make the heat transfer to the ground more evenly. So that the surface temperature of the ground tends to balance.
The thickness of the filling layer?
Because the thickness of the filling layer directly affects the net height of the room, the load of the structure and the initial investment of the building, it should not be too thick. Experimental and engineering practices have consistently confirmed that the above requirements can basically be satisfied when the thickness of the packed layer is 50 mm (30 mm protective layer on the top of the heating tube). Considering that there is still about 30mm cement mortar leveling layer in the upper part of the filling layer, it can work together to balance the temperature. Therefore, the specified thickness should be 50mm, and the minimum should not be less than 40mm.
Why does the water flow rate in the tube not be less than 0.25 m/s?
The water flow rate in the pipe must not be less than 0.25 m/s. Therefore, this article makes a restriction based on this, the purpose of which is to enable the water stream to carry away the air and prevent gas blocking.
What are the functions of two ball valves and filters on the water supply pipe?
Two ball valves are provided on the water supply pipe, mainly for cleaning and filtering or replacing or repairing the heat metering device; the filter is provided to prevent impurities from clogging the flow meter and the heating pipe.
Does the wire mesh have the density requirement?
Steel wire diameter is generally Φ2mm, grid is 150mm2.
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The present invention provides a multifunctional pull faucet, comprising: a faucet body, a drawing part is provided at the water outlet port thereof, and the drawing part is connected to a main channel, wherein at least three are provided in the faucet body A branch channel, and the three branch channels are all connected to the main channel. A multifunctional pull faucet provided by the present invention, wherein the hot water channel, the cold water channel and the water purification channel (pure water channel) are all connected to the main channel , And the main channel is connected with the drawing part on the main body of the faucet, so that the drawing part can obtain the water quality (hot water, cold water, purified water or pure water) required by different users, thereby improving the user experience, and , By integrating the hot water channel, cold water channel and pure water channel (pure water channel) into the main channel, the internal structure of the faucet is simplified, and the production cost of the faucet is reduced.
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