Questions about floor heating knowledge 1

What is low-temperature hot water floor radiant heating?

Hot water with a temperature not higher than 60℃ is used as a heating medium, which circulates in the heating pipeline buried in the filling layer below the ground, heats the whole layer, and supplies heat to the room through ground radiation and partial convection heat transfer.

What are the advantages of floor radiant heating?

1, healthy and comfortable environment

2. Energy conservation and environmental protection

3, household metering, different room temperature control

4. Improve the property grade.

5. Good thermal stability and long service life.

How to explain that 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. Traditional heating methods mostly use convection to heat indoors, which leads to indoor dust flying, uneven heat distribution and dry indoor air. Low-temperature floor radiant heating is heated by radiation, and the heat is evenly distributed from bottom to top, forming an ideal room temperature for human heating, giving people a feeling of warm and comfortable whole body and refreshing mind. At the same time, due to the lower room temperature and moderate air humidity, it can prevent nasal mucosa and respiratory tract from drying, and avoid dust accumulation and bacterial spread.

How to explain that floor heating has the function of energy saving and environmental protection?

Low temperature floor radiant heating, using the whole indoor floor as radiator, the indoor air temperature can be 2-3℃ lower than other heating methods, and this alone can save energy 10%. In addition, geothermal energy and industrial waste heat can be used as heat sources for floor radiant heating, and the low-temperature transmission of heat medium also reduces the heat loss during transmission.

Why do you say that floor heating can be measured by households and adjusted by rooms?

Floor heating is a system for one household, and each household and room is a loop, so it can fully reflect the residents' self-control of hot commodity consumption, and also meet the technical requirements of "household metering and temperature regulation in different rooms" put forward by the state.

From what aspects can floor heating improve the property grade?

Because the heating and hot water coil of low-temperature floor radiant heating are hidden in the floor, it does not occupy the room area, which is convenient for users to carry out indoor decoration and can maintain the true color of indoor decoration for a longer time. Convenient property management. The pipes used in low-temperature floor radiant heating technology are all plastic pipes, which will not rust and scale, and are convenient to maintain and can prolong the life of boilers.

Why do you say that radiant floor heating has good thermal stability and long service life, which is several times that of radiator?

Because of the large thermal storage capacity and good thermal stability of the ground and concrete floor, the indoor temperature changes slowly in the case of intermittent heating. The world-recognized manifold can be used continuously for more than 50 years, which is 6 times that of ordinary radiator.

What are the main materials in the low-temperature hot water floor radiant heating system?

Main materials in hot water floor radiant heating system: heating pipes, distribution manifolds (including connectors, etc. ), heat insulation board and auxiliary materials, etc.

Which pipes can be used as low-temperature floor radiant heating pipes?

From the performance index of products, PEX, PP-R, PE-RT and PB can meet the requirements of radiant floor heating, and they have mature and extensive application experience at home and abroad. The floor heating pipe is a special pipe in the application field, and its particularity lies in that the whole pipe network is buried underground. If there is damage and leakage in the process of installation and use, it will cause great losses and maintenance is very difficult. Therefore, both the safety and stability of the pipeline are required, and the repairability of the pipe network system must be considered. From the perspective of comprehensive cost performance, PE-RT and PE-Xb pipes are more suitable for the application requirements of China floor heating pipe market.

What is the supply and return water temperature of floor heating?

Water supply temperature: 60-50℃, backwater temperature: 50-40℃

What is the temperature difference between water supply and backwater?

The temperature difference between supply and return water should not be greater than 10℃

Why can't the water supply temperature of floor heating be too high?

Under the premise of 50 years' use, the floor heating pipe can supply hot water at high temperature, but when it exceeds 60℃, the strength of cement layer on the building floor will decrease, which will affect the service life of the building.

How long is the best loop for floor heating?

The length of each group of heating pipes connected to the same water distributor and water collector should be as close as possible, with an overall range of 70- 120m, but each loop should be 90m as far as possible, with the longest not exceeding 120m.

What is a distribution manifold?

Water collection and distribution unit (heating medium collection and distribution unit)

A cylindrical pressure-bearing device with a main inlet (outlet) and a plurality of sub-outlets (inlets) is equipped with a gas release valve and each channel valve to control the flow and speed of the system.

The low-temperature hot water floor radiant heating system should have an independent water distributor (collector), which requirements should be met?

1 Every household in the house should be equipped with at least one set of water distributor (water collector); Each water distributor (collector) should not have more than 8 branches;

2. The nominal diameter of the main inlet and outlet pipes of the water distributor and water collector is generally DN 32 mm When there are 8 groups of heating pipes, the heat medium flow in the pipes can be kept below the maximum allowable flow of 0.8 m/s. ..

3. The diameter of the water distributor (collector) should be greater than the total diameter of the water supply and return pipe;

4, points (set) water heater should be higher than the floor, and equipped with exhaust device;

5. The main water supply pipe, return pipe and each branch pipe of water supply and return shall be equipped with valves and have the function of manually or automatically adjusting the room temperature; For central heating system, household heat meters should be installed. If there are no conditions, rice should be reserved.

What are the floor structures of radiant floor heating?

Floor structure of radiant floor heating: floor layer, leveling layer, waterproof layer, filling layer, heating pipe, insulation layer, floor, etc.

What are ground layer, leveling layer, waterproof layer, filling layer, thermal insulation layer and moisture-proof layer?

1, floor (finished floor)

The surface layer of the building ground directly bears various physical and chemical effects.

2, leveling layer (trowel flat layer)

A smooth structural layer on a filling layer or a structural layer.

3. Waterproof layer

A structural layer that prevents water and gas from infiltrating into the ground.

4. Filling layer

In order to protect the equipment and make the ground temperature uniform, a structural layer for burying heating pipes is set on the floor base.

5. Insulation layer

Structural layer for preventing heat transfer and reducing ineffective heat consumption.

6. Wet layer (wet layer)

To prevent the moisture under the building foundation or floor from infiltrating into the structural layer of the ground.

What are expansion joints, steel mesh, cable ties and sleeve fittings?

1, expansion joint (contraction joint)

Compensate structural cracks caused by expansion or contraction of concrete filling layer, superstructure layer and ground layer.

Step 2: barbed wire

The invention relates to a low-carbon steel wire welding component for fixing a heating pipe.

3. Band class

A plastic band that fixes the heating pipe to a metal mesh.

4. Compression assembly

A pipe fitting, in which a heating pipe is inserted into the inner core of the pipe fitting, a C-shaped copper ring placed outside the pipe fitting is tightened by a compression nut, and sealing is completed by a sealing ring. It is usually used to connect PE-RT pipeline and water separator.

How to choose thermal insulation materials?

Materials with low thermal conductivity, low moisture absorption rate, incombustible or incombustible, and sufficient bearing capacity are adopted, and they do not contain bacteria sources and emit odors and volatile substances that may be harmful to health. Generally, polystyrene foam plastic shall be used for insulation board, and its quality shall conform to its physical properties and meet the following requirements:

Apparent density should not be less than 20k g/m3；; ; Thermal conductivity should not be greater than 0.04 1W/(m? k)； The compressive stress should not be less than100 kpa; Water absorption should not be greater than 4%; Oxygen index should not be less than 30; After being placed at 70℃ for 48 hours, the dimensional change rate is not more than 5%; Meltability (bending deformation) is not less than 20mm. How to enhance the overall strength of insulation board?

The surface of the insulation board can be treated as follows:

1, laying vacuum aluminized polyester film surface layer;

2, laying a glass cloth-based aluminum foil surface layer;

3. Laying low carbon steel wire mesh;

How to choose heating pipes and fittings?

The colors of heating pipes and fittings shall be consistent and uniform, without decomposition and discoloration.

The inner and outer surfaces of the heating pipe should be smooth and clean, and there should be no delamination, pinholes, cracks, bubbles, peeling, marks and inclusions, but slight and local defects, such as scratches, pits, pressed objects and spots, which do not make the outer diameter and wall thickness exceed the allowable tolerance are allowed. Slight straightening and turning marks, tiny scratches, oxidation discoloration, darkening, water marks and oil marks cannot be used as the basis for scrapping.

How to transport and store pipes and fittings?

Pipes, pipe fittings and insulation boards shall be handled with care during transportation, loading and unloading and handling, and shall not be hit by violent collision and sharp objects, and shall not be thrown, dropped, rolled or dragged to avoid contact with oil pollution.

Pipes, pipe fittings and insulation boards shall be stored in a well-ventilated warehouse, with the temperature not exceeding 40℃, away from fire and light, and the distance from heat source not less than 1m, and shall not be stored in the open air. The stacking area should be clean and flat to prevent dust and sundries from entering the pipeline.

What is the hot melt connection temperature of PP-R floor heating pipe?

When the welding machine is heated to 260℃ (the green light is on), the pipes and fittings are pushed into the welding machine at the same time and heated according to the "welding progress".

How to choose the thickness of insulation layer?

Floor insulation between floors

20 mm

Thermal insulation on the floor near soil or outdoor air.

40 mm

Thermal insulation along the inner periphery of the outer wall

20 mm

How to choose the material of the filling layer?

C 15 pisolite concrete should be used as the filling layer, and the particle size of pisolite should not be greater than 12mm, and an appropriate amount of anti-cracking agent should be infiltrated. The thickness of the filling layer should be 50 mm If the ground load is more than 20KN/m2, reinforcement measures should be taken in conjunction with the structural designers.

How to design floor heating for high-rise buildings?

When the building height exceeds 50m, the heating system should adopt the design of vertical partition heating, mainly to reduce the pressure (not more than 0.8MPa) on the cooling equipment and accessories in the system, so as to ensure the safe and normal operation of the heating system.

What is the average surface temperature of low temperature floor radiant heating, which is the most comfortable for people?

Environmental conditions: personnel long-term stay area, personnel short-term stay area, personnel non-stay area, bathroom, swimming pool.

The suitable ranges are 24-26℃, 28-30℃, 35-40℃ and 30-35℃.

The maximum limit is 28℃ 32℃ 42℃ 33 (en1264)℃.

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 forms of heating pipes?

According to the principle of ensuring uniform ground temperature, parallel (in-line) and folding (rotary) should be selected.

For rooms with obviously uneven heat loss, pipes are generally laid near external windows and external walls to compensate for indoor heat loss.

What is the spacing between heating pipes?

The spacing of heating pipes should be calculated and determined according to the ground heat dissipation, indoor design temperature, average water temperature and heat transfer resistance. When arranging heating pipes, the combination of density and density should be adopted according to the distribution of heat loss in the event, but the maximum distance between pipes should not exceed 300 mm (the distance between pipes should be 100-300mm, and the distance between heating pipes and the inner surface of external wall should be 100mm).

What is the design pressure of the heating pipeline?

The design pressure of the heating pipe is 0.8Mpa.

What is the function of the bypass pipe between the water separator and the water collector?

A bypass pipe should be set between the water distributor and the water collector, so that the heating pipeline system can be flushed as a whole without water flowing into the heating pipeline.

Under what circumstances do you need cement mortar reinforcement?

When the radiant heating system is laid on the soil, cement mortar strengthening layer should be made under the insulation layer;

Where do I need to set up a waterproof layer?

When the radiant heating floor is located on the floor of a humid room (bathroom, kitchen, swimming pool, etc.). ), waterproof layer should be done on the filling layer.

What is the thickness of the filling layer?

The heating pipe should be filled with pebble concrete, and the thickness of the filling layer is equal to the outer diameter of the heating pipe. The cement mortar leveling layer at the upper part of the filling layer should not be less than 30 mm. When the ground live load is greater than 20KN/m2, the reinforcement measures shall be determined through design and calculation.

What conditions do you need to meet before installing the low-temperature hot water floor radiant heating system?

1, complete design and construction drawings and related technical documents;

2, a relatively perfect construction scheme, construction organization design and technical disclosure;

3, the construction of ready-made water supply or power supply conditions, temporary measures to store materials;

4. The metope of civil engineering specialty has been painted (excluding the bottom layer), the external doors and windows have been installed, and the ground has been cleared; Kitchen, toilet should be closed water test and acceptance.

5. All kinds of installation materials have passed the inspection, and the attached instructions and certificates should be complete.

In the process of construction, what should I do if it does not conform to the design drawings?

In the process of construction, if it is not in conformity with the design drawings, or there are other changes, the construction can only be started after consultation with the designers and relevant responsible persons, and the drawings should be marked and the changes recorded.

What is the minimum ambient temperature standard for the construction site of low-temperature hot water floor radiant heating project?

During the construction of low-temperature hot water floor radiant heating project, the ambient temperature should not be lower than 5℃, and when PE-RT pipe is used as heating pipe, the ambient temperature should not be lower than 0℃.

How much should the heating temperature of hot melt be controlled?

Quality control of hot-melt connection: the heating temperature of hot-melt should be controlled at about 240℃. It is forbidden to contract the pipeline due to overtime or overtemperature welding, and the connection is not firm due to insufficient welding temperature and time.

What problems should be paid attention to during or after the installation of heating pipes?

The exposed part of the heating pipeline that has been installed intermittently or completed shall be blocked at any time.

How to determine the bending radius of heating pipe?

The bending radius of heating pipeline should not be less than 6 times of the outside diameter of the pipeline.

Can there be a joint in the buried part of the heating pipeline laid underground?

There should be no joint in the buried part of the heating pipeline laid under the ground.

After the construction acceptance, it was found that the heating pipe was damaged. How to solve it?

Although the heating pipes buried in the filling layer should not have joints, if it is found that the heating pipes are damaged after construction acceptance, and joints need to be added, the heating pipes made of different materials should adopt hot-melt connection or sleeve-type copper pipe joints, and anti-corrosion protection measures should be added to the outside when using copper pipe joints.

What fixing methods can be used for heating pipes respectively?

The following fixing methods can be adopted respectively:

1. Fix the heating pipe directly on the composite surface insulation board with a special plastic card.

2. Tie the heating pipe to the steel wire mesh laid on the surface of the insulation layer with a cable tie.

3, directly stuck on the special pipe rack or pipe clamp laid on the surface of the insulation layer.

What is the best distance between the fixed points of heating pipes?

The distance between fixed points of heating pipeline is 0.4-0.6m for straight pipe section and 0.2-0.3m for bent pipe section.

What problems should be paid attention to when connecting the water distributor, water collector device and pipe fittings with the heating pipeline out of the ground?

The connection between the heating pipe out of the ground and the distributor, water collecting device and pipe fittings should be vertical, and the elbow is not allowed to expose the decorative layer on the ground. The exposed pipe section between the heating pipe above the ground and the ball valve interface at the lower part of the water distributor and water collector shall be covered with hard plastic sleeve.

What problems should be paid attention to near the densely arranged parts of local heating pipes such as water separators and water collectors?

When the pipe spacing is less than 100mm near the densely arranged parts of heating pipes such as water distributor, heat preservation measures such as flexible sleeves should be set outside the heating pipes, or steel wire mesh should be added in the filling layer to prevent the ground from cracking.

How to deal with the expansion joint where the heating pipe passes through the concrete filling layer?

When the heating pipeline passes through the expansion joint of the concrete filling layer, a unified flexible sleeve or plastic pipe with a length not less than 100mm shall be set at both ends.

What should I pay attention to when installing water separator and water collector?

The water distributor and water collector should be installed before the heating pipe is laid.

1, when installed horizontally, it is generally appropriate to install the water separator at the top and the water collector at the bottom, with a center distance of 200mm and a center distance of not less than 300mm from the ground.

2. When installed vertically, the lower ends of the water distributor and water collector shall be not less than 150mm from the ground.

What conditions should the concrete filling layer meet before construction?

1, which should be carried out under heating pipeline installation, water pressure test and pipeline system pressure.

2. The edge heat insulation strips near the vertical part have all been installed.

3. The insulation layer has been covered with a suitable covering layer.

4. The required expansion joints have been designated by the designer and arranged by the heating or filling layer construction company.

5, through the concealed engineering acceptance.

What is the system water pressure during the construction of concrete filling layer?

The construction of concrete filling layer shall be undertaken by the civil construction party, and the installation unit shall cooperate closely to ensure that the water pressure in the heating pipeline is not less than 0.6Mpa, and it shall be kept not less than 0.4Mpa during the system maintenance.

What structural measures are adopted for thermal expansion compensation of concrete filling layer?

1. When the ground area is greater than 30m2 or the length is greater than 6m, the filling layer shall be constructed in layers, each grid is ≤6m, and the expansion joint is ≥5mm wide.

2. At the junction with interior walls, columns and doors, set aside expansion joints with a width of more than 5 mm.

3. The expansion joints are filled with elastic expansion paste or polyethylene foam strips.

4, expansion joints should be extended to the ground. Expansion joints must separate building components from the upper edge of insulation layer to the upper edge of floor in the whole section.

How long is the curing period of concrete filling layer? What problems should I pay attention to after the maintenance period expires?

The curing period of concrete filling layer should not be less than 2 1 day. After the expiration of the maintenance period, the ground should be properly protected. It is forbidden to run under heavy load and bake at high temperature, and it is forbidden to put high-temperature objects and high-temperature heating equipment directly on the ground.

What materials should be used for floor decoration of low-temperature hot water radiation heating?

1, cement mortar, concrete floor

2, ceramic tile, marble and terrazzo floor

3. Composite wood flooring, solid wood flooring and heat-resistant solid wood flooring that meet national standards.

Before the construction of the ground layer, it should be determined whether the filling layer reaches the dryness required by the ground layer before construction. In addition to the requirements of civil engineering design drawings, what provisions should be met in the construction of ground floor?

1. When the bottom layer is constructed, it is not allowed to pick, chisel, cut, drill or nail the filling layer, and nothing is allowed to be wedged into the filling layer.

2, floor construction, must be carried out after the concrete reaches the required strength.

3, the ground floor (stone, brick) and wall, column, etc. , should leave 5-8mm wide expansion joints (finally to the skirting board); When laying the wooden floor, there should be expansion joints ≥14 mm.

4. When the wooden floor is used as the ground, the wood must be dry, and the floor can only be pasted after the filling layer and leveling layer are completely dry.

Is there a water stop wall in kitchen and bathroom construction?

At the entrance of the bathroom and kitchen, a water-stop wall with a height of 60-80mm and a thickness of 120mm should be set, and the inside of the water-stop wall should be waterproof in coordination with the civil engineering specialty.

What safety matters should construction personnel pay attention to after entering the construction site?

1. After entering the site, the construction personnel must abide by the site safety rules and regulations, accept the supervision of the safety officer, and conduct civilized construction.

2, there must be two people present when open flame operation, do people walk without electricity.

3, electricity, should be operated by a professional electrician, it is forbidden to pull the power supply.

4, it is forbidden to drink and mount guard. Special work should be handled by special personnel.

5, construction personnel, must wear work clothes. Master the essentials when welding to avoid burns.

What contents should be inspected, accepted and summarized before handover or concealment of each discipline and process?

1, quality of pipes, water distributors, water collector components, valves, fittings, thermal insulation materials, etc. ;

2. Installation quality of pipes and fittings;

3. Acceptance of hydrostatic test before concealment;

4, the original ground, filling layer, ground layer construction quality inspection and acceptance;

5, intermediate handover quality inspection and acceptance;

6. Acceptance of hydrostatic test after concealment;

7, washing inspection and acceptance;

8. Circuit and system debugging.

Construction organization design or construction scheme should include the following contents?

1, engineering construction;

2, construction drawing design points, pipeline layout, node diagram, the original ground to ground layer profile, the location of expansion joints, etc. ;

3, the main materials and equipment performance and technical indicators, specifications, models, etc. And customs storage measures;

4, the construction process and the professional construction time plan;

5. Quality control measures and acceptance criteria for building installation, including: installation quality of main materials and equipment, construction quality of original ground, filling layer and ground layer, water pressure test, comprehensive inspection before concealment, loop and system debugging and completion acceptance, etc.

6, construction schedule, labor plan;

7, safety, environmental protection, energy saving technical measures.

Do the main materials used in the hot water floor radiant heating system project need quality certification documents?

This is necessary. The main materials, equipment components, valves, pipe fittings and thermal insulation materials used in the project of hot water floor radiant heating system must have China quality certification documents, and their specifications, models and performance and technical indicators should conform to the current relevant national technical standards. Inspection and acceptance shall be carried out when entering the site, and confirmed by the supervision engineer.

How to check the quality of valves and distribution manifold components before installation?

Before installing valves and distribution manifold components, strength and tightness tests should be carried out. The inspection shall be carried out at 65438 00% of each batch (same brand, same model and same specification), and there shall be no less than one. The bypass valves installed at the inlet of the distribution main pipe, the outlet of the water collector and the bypass pipe should be tested for strength and tightness one by one, and all of them are qualified.

Why does the wooden floor crack? What caused it?

There are many phenomena of warping and cracking of wooden floors, and there are roughly three reasons:

The first case: the quality of the wooden floor is not good, it has not been strictly dried, and the moisture content is too high. After use, with the decrease of water content, the wood shrinks and cracks appear. In fact, this kind of floor will crack even if it is used in a room without floor heating.

The second case: the wooden floor is paved prematurely when the filling layer is not completely dry. After the wooden floor is laid, the water in the concrete is still evaporating, which makes the water content of the originally dry wooden floor rise, thus expanding and bulging.

The third case: when the wooden floor is laid, there is no expansion joint at the joint between the floor and the wall, column, etc. Therefore, when the floor expands due to heat, there is no way to compensate for the expansion displacement, resulting in warping.

In fact, using hot water floor radiation heating, the floor temperature will not exceed 40℃, which is equivalent to the summer temperature in some areas, and far below the temperature when wood is dry. Therefore, floor heating itself can not cause damage to the wooden floor.

What is the pressure standard for the strength test of the valve?

The strength test pressure of the valve is 1.5 times the working pressure; The leak test pressure is 1. 1 times of the working pressure, and the duration of the strength and leak test for valves with DN less than 50 is 15 seconds, during which the pressure should be kept at an edge, and there is no leakage in the shell, packing and sealing surface.

Is acceptance required before pouring the filling layer?

After the installation of heating pipeline of floor radiant heating system is completed, the construction unit shall, together with the supervision unit, conduct intermediate acceptance according to the requirements of concealed works before pouring the filling layer.

What items must be checked and summarized during the intermediate acceptance of hot water floor radiant heating system?

1, whether the thickness, laying and physical properties of the insulation layer meet the requirements.

2, heating pipe, pipe diameter, wall thickness, pipe spacing, bending radius, etc. Whether it meets the design requirements and whether the fixation is reliable.

3. Whether there is leakage in the heating pipe and the joint between the heating pipe and the water distributor and water collector.

What regulations should the hydrostatic test meet?

1. The water pressure test shall be conducted after the system is flushed.

2. Hydrostatic test shall be carried out in groups or loop by loop for each component and water collector.

3, water pressure test should be carried out twice, respectively, before the concrete is cast and after the expiration of the filling layer maintenance.

4. The test pressure shall be 1.5 times the working pressure and shall not be less than 0.6Mpa.

5. Inspection method: under the test pressure, stabilize the voltage for 65438 0 h, and observe its pressure drop. If the pressure drop is not greater than 0.05Mpa,

Is considered qualified.

6. Manual pump should be used to slowly boost the pressure during the water pressure test. Observe and check whether there is leakage at any time during boosting.

7, in the case of possible icing pressure test, after the completion of the pressure test should be timely blow dry the water in the tube.

8. Air pressure test should not be used instead of water pressure test.

How to flush and debug the pipeline system?

Before commissioning, the piping system should be flushed. After the return pipe, the main supply outside the water distributor and water collector, is flushed, the indoor floor radiant heating system is flushed, and then hot water is put into trial operation. Flushing and debugging hot water should be injected through the filter and then through the water separator to avoid impurities from entering and remaining in the heating pipe network.

Can the radiant floor heating system be used without debugging?

The floor radiant heating system has not been debugged, so it is forbidden to operate.

What steps do you need to debug the hot water floor radiant heating system?

The trial operation of hot water floor radiant heating system must be carried out after the bottom layer is completely dried (at least 2 1 day after the completion of filling layer construction). When heating for the first time, the hot water temperature should be gentle, and the water supply temperature should be controlled to be about 10℃ higher than the ambient temperature at that time, but not higher than 32℃. At this water temperature, it should run continuously for 48h；; After that, the water temperature increased by 3℃ every 24 hours until it reached 60℃. At this temperature, the heating pipes connected to various components and water collectors should be adjusted one by one to make the temperature of each room close to the indoor design air temperature.

What is the evaluation standard of heating effect of floor radiant heating system?

The heating effect of the radiant floor heating system should be based on the temperature indicated by the wet bulb thermometer at the center of the room 1.5m from the ground, as the basis for evaluation and assessment.

How to debug when heating conditions are not available?

When the heating conditions are met, it should be debugged before the completion acceptance; When the heating conditions are not available, the commissioning can be postponed after consultation with the project construction unit.

What materials should be submitted when the project is completed and accepted?

1, construction drawing, completion drawing, design document and design change document.

2, construction scheme and system installation site records.

3, the main materials, products and parts of the factory certificate and quality inspection report.

4, concealed engineering acceptance and intermediate acceptance records.

5. Pressure test and flushing records.

6, engineering quality inspection and evaluation records.

7, heating system debugging records.

Which comes first, heating system debugging or completion acceptance?

In principle, the completion acceptance shall be carried out after the heating system has passed the debugging.

What are the requirements of the completion acceptance standard to pass the completion acceptance?

1, the completion quality meets the design requirements and the relevant provisions of this technical manual.

2, pipes and components without leakage.

3. The valve is flexible to open and tight to close.

What is the main function of the packing layer?

The filling layer has two main functions: one is to protect the heating pipe; The second is to transfer heat to the ground more evenly. So that the ground temperature tends to be balanced.

What is the thickness of the filling layer?

Because the thickness of the filling layer directly affects the indoor clear height, the load of the structure and the initial investment of the building, it should not be too thick. The experiment and engineering practice unanimously confirm that the above requirements can be basically met when the thickness of the filling layer is 50mm (there is a 30mm protective layer on the upper part of the heating pipe). Considering that there is a cement mortar leveling layer of about 30mm at the top of the filling layer, which can play a synergistic role in balancing temperature, the specified thickness should be 50mm and the minimum should not be less than 40 mm.

Why can't the water velocity in the pipeline be less than 0.25m/s?

The velocity of water flow in the pipeline should not be less than 0.25m/s. Therefore, this article has made corresponding restrictions, with the purpose of letting the water flow take away the air and preventing air blockage.

What are the functions of two ball valves and filters on the water supply pipe?

There are two ball valves on the water supply pipe, which are mainly used for cleaning, filtering and closing when replacing or repairing the heat metering device; The filter is set to prevent impurities from blocking the flowmeter and heating pipe.

Is there a density requirement for wire mesh?

Generally, the diameter of steel wire mesh is 2mm, and the grid is 150mm2.