How to design the hotel floor heating, who knows the specific steps and ideas, thank you.

1, briefly describe the whole steps of floor heating design?

1). Change the condition diagram; 2). Load calculation; 3). Determine the spacing; 4). Draw the floor heating coil; 5). Draw the floor heating system diagram; 6). Organize the chart. 2. What should be drawn on the floor plan?

The specific layout of heating pipes should be drawn in the plan, indicating the laying spacing, pipe diameter, calculated length and expansion joint requirements of heating pipes. The position of distribution manifold is given, and the layout position of expansion joint is drawn. The north arrow should be given on the first floor of the floor heating coil layout, and the outdoor height difference should be given in the plan of the pipeline leaving the house, indicating the plus or minus zero elevation points. Give the drawing name and scale, and the icon shall give the drawing name, drawing number, drawing date and design number.

3. What should be included in the design description?

General situation of the project, design basis, calculation parameters of heating design, heating system, and special articles on energy saving (as required).

4. What should be included in a complete set of construction drawings?

Construction drawings generally include design description, outdoor floor plan of the first floor pipeline, heating floor plan of the first floor, standard heating floor plan (if the middle floor is the same, the architectural form or heat load of the middle floor needs to be drawn separately), top heating floor plan, distribution main, schematic diagram of ground structure and other heating node details, heating system diagram and drawing catalogue.

5. What is the theoretical basis and simple engineering method for determining the spacing of floor heating coils?

For the theoretical basis, please refer to Technical Specification for Radiant Floor Heating or Practical Manual for Heating and Air Conditioning Design. According to the limitation of codes and practical projects, the coil spacing of floor heating is generally between 200 and 300 mm. The significance of load calculation may not be used to accurately determine the coil spacing, but as a reference for design. The designer chooses the relative spacing according to the relative load of the room. Generally speaking, in the same room, the rooms in the north are denser than those in the south, the sides are denser than the middle, and the top floor and the first floor are denser than the middle.

6. What do you need to pay attention to when calculating the heat load manually? What are the commonly used software for calculating the heat load?

For routine load calculation, please refer to Practical Heating and Air Conditioning Design Manual or other design manuals or textbooks. Calculate the heat load according to the conventional radiator heating, and then multiply it by 0.9 ~ 0.95, which can be used as the floor heating load. Commonly used softwares include Chen Hao HVAC, Tianzheng HVAC and Hongye HVAC. These softwares can be used for load calculation and coil drawing.

7. Briefly describe drawing steps and pipeline balance?

First, we must determine the location of the distribution manifold and draw the coils in each room. Determine the number of paths in the distribution manifold according to the total length of the coil, first measure the total length of the pipeline, and determine the number of paths in the distribution manifold according to no more than 120M; Adjust the pipeline balance, so that the lengths of each road are close, and pay attention to the pipeline as far as possible not to pass through the wall; Draw expansion joints and mark the spacing and length of coils, so that the plan can reach the design depth of the construction drawing.

8, pure CAD drawing floor heating coil steps?

First of all, we must get the building condition map, and have calculated the spacing of the floor heating coil. Firstly, use the offset command to offset the floor heating coil closest to the building wall from the position close to a certain wall (for example, the distance can be100 mm); ); Then according to the calculated spacing (for example, the spacing is 300mm), the spacing of pipes is shifted to the position close to the room in turn; Next, offset from the other three walls. Trim the redundant pipeline with Trim command to make it a right-angle shape; Finally, use the chamfer command to reverse all the turns of the coil into arcs. In this way, the coil of a room is coiled.

9. How to determine the diameter of the floor heating coil and its riser?

Generally speaking, it is not necessary to calculate the diameter of the floor heating coil. In most civil buildings, the diameter of De20(DN 15) can meet the requirements. When calculating the diameter of the riser, first calculate the load of the riser in this section, so as to find out the flow, and control the specific friction within the range of 80 ~ 120 Pa/m to select the diameter. Available software includes Hongye Hydraulic Calculator, etc.

10, what is the recommended value of external network economic ratio friction?

40~80Pa/m

How to deal with the balcony closed by the balcony door in load calculation?

There are two processing methods: 1. According to the calculation without balcony, but not considering the cold air infiltration. Namely: the heating area accounts for the room area, and the balcony area is omitted; Balcony doors are regarded as external doors. When we calculate by air exchange rate method, the air exchange rate is 0; If the gap length method is adopted, the penetration length of cold air is taken as 0. 2. Take a circle of floor-to-ceiling glass on the balcony as external maintenance. That is, the heating area is still the room area, and the wall at the balcony entrance does not participate in the coincidence calculation. Balcony is used as external maintenance, and its shared area is used as the corresponding load surface.

12. How to determine the terminal resistance of the floor heating coil?

A loop may sometimes pass through two rooms. If so, when calculating the load of this circuit, the loads of the two rooms should be cumulative. If a loop passes through the whole room and a part of another room, it can be handled as follows: take the load of that whole room and part of that room (you can use the principle of relative coil area and relative load to take values according to the area they occupy. If this part is close to the outer envelope, it should be enlarged appropriately, for example, multiplied by the correction coefficient 1.2, so as to reduce the error between the actual situation and the theoretical analysis. There are two methods to calculate local resistance: one is resistance coefficient method; The other is the conversion length. According to this method, the resistance of each loop is calculated one by one, and the maximum value is taken as the household resistance.

13, details of common nodes?

1). Hot inlet device; 2). Residential household heat meter; 3). Practice of floor radiant heating; 4). Distribution manifold details; 5). Detailed drawing of pipeline well.

14. How many renovation plans are there for the office building with radiator heating in the floor heating community?

Scheme 1: Remove all radiators in the original office building and re-lay the floor heating coil. That is to transform central heating into floor heating.

Option 2: Change the original indoor radiator into a fan coil unit. For general rooms, you can choose the surface-mounted fan coil installed under the window; High-end offices can consider using hidden ceiling mode.

Scheme 3: Transform the hot inlet and use the heat pump to raise the water temperature.

Option 4: Transform the boiler room. The boiler takes water from the floor heating backwater, and the water supply is burned to the design temperature of 95 degrees. The water supply is connected to the office building, and the backwater is estimated to be about 70 degrees. Enter the backwater of the next boiler, and supply it to the external network of floor heating after heating.

Option 5: The boiler room should be rebuilt. The design temperature of supply and return water of one boiler is 55/45, which is specially used in floor heating district, and the design temperature of supply and return water of another boiler is 95/70, which is directly supplied to the office building. At the same time, the heat exchanger is connected in parallel from the water separator to supply the water after heat exchange to the floor heating system, which solves the problem that the output of heating a boiler alone is not enough.

Scheme 6: Both boilers burn to the design parameter of 95/70, the floor heating water is used after mixing water or heat exchange, and the office building directly uses 95/70 hot water.

Scheme 7: Prepare the heat source for the office building separately. Independent boiler room or lithium bromide gas unit or heat pump technology, of course, electric boiler can be considered if the policy allows; If there is a preferential policy of time-of-use electricity price, heat storage technology can be considered.

15, the characteristics of boiler room heating?

Boiler rooms generally use intermittent heating. When the boiler is ignited, we must provide the building with a certain amount of heat that is greater than the actual heat consumption, so that the cooled building can quickly rise to the design temperature, and input excess heat in advance, so as to keep the building at a certain temperature by relying on the heat storage of the building when the boiler stops burning. The actual building goes through the process of "supercooling-overheating-supercooling". In the overheating stage, the building absorbs excess heat and stores it; In the supercooling stage of boiler shutdown, the building relies on heat storage to radiate heat to the room.

16, the component of the resistance of the unit housing system?

Indoor terminal coil resistance, household heat meter, distribution main pipe and other equipment, heating riser, heating household supervisor, unit heat inlet.

17, after the renovation, the first floor of a residential building is over 20 degrees, and the second floor is basically not hot. How many schemes are available for reference?

1). Thinning the connecting pipe between the male * * * riser and the household in the stairwell is equivalent to increasing the user resistance, which can make the user resistance close and reduce the direct parallel imbalance rate.

2) Install the orifice plate: remove the copper plate of the gate valve, punch a hole and install it.

3). It is recommended that each household install a locking regulating valve. At the same time, check whether the setting of the balance valve at the thermal inlet of the unit is reasonable.

18. What are the main contents and matters needing attention in the statistics of floor heating materials?

1). First, count the number of floor heating coils; After the larger public beta, you can order the specified length of pipeline directly from the manufacturer. The project is relatively small, so try to put the whole plate into a close length and match it well to reduce waste. Note: Please indicate the material, pipe diameter and wall thickness of the floor heating coil.

2) Next, we need to count the number of insulation board (extruded board used by Xide Company) and reflective film (aluminum foil used by Xide Company Irvine Top). Note: The thickness of insulation board on standard floor, ground and floor with outside air is different. Please make statistics according to different thicknesses.

3). Selection of distribution manifold. Copy them one by one according to the drawings, and finally summarize the number of roads statistically.

4). Statistics of other materials. Conduits and pipes used for heating should be statistically summarized according to different materials, pipe diameters and wall thicknesses; Valves of different types and diameters should also be statistically summarized separately. Insulation materials and insulation protection materials should also be included in the list of required materials.

19, radiator heating district, under the premise of sufficient financial pressure, what should I pay attention to when transforming myself into floor heating?

The supply and return water temperature of central heating is generally 95/70 degrees or 85/60 degrees. The supply and return water temperature of floor heating should not be higher than 60 degrees. If the radiator is changed to floor heating, the indoor heating system cannot be connected to the heating heat pipe in the community. It must be cooled before use. The usual practice is to add a set of water mixing device.