【 Weak current College 】 Beijing new central heating household metering design specification

The code for the main technical content is:
1. General provisions;
2. term;
3. heating load calculation;
4. the heat source and outdoor system design;
5. Interior design of the system;
6. indoor system design;
7. the system hydraulic calculation;
8. heat metering device. 1 indoor system design
1.1 General requirements
1.1.1 new central heating residential indoor system, should be set according to the household heat meter heat metering method design. Accordingly, it would be advisable to adopt common legislation of individual independent system type.
1.1.2 should be set to a table. With a variety of unit type, and set-difference between the larger area of residence, according to the hydraulic balance or pipe system layout, set type larger when one or more tables.
1.1.3 indoor heating system consists of a heating pipe inlet installations, the loops for backwater dry pipe and the sharing of risers.
1.1.4 residential public housing and public space, set up separate heating system and heat metering device.
1.1.5 hot water heating system low working pressure, should satisfy the following requirements:
(1) the radiator heating systems, should be consistent with national standards for the heating, ventilation and air-conditioning design specifications "on vertical division heating requirements.
(2), radiant floor heating system should be consistent with the Beijing Municipal standards the low-temperature radiant floor heating application of technical procedures.
(3) air conditioning heating water system, should not be more than 1.0MPa.
1.1.6 system working pressure exceeding the lowest point 1.1.5 of the heating system should be used in reliable and meet the energy requirements of vertical partitions, and with the heat source system and outdoor pipe network system design.
1.2 heating pipe inlet
1.2.1 the loop met indoor hydraulic balance and overall heat metering, should minimise the building's heating pipe entry number.
1.2.2 the entry device heating pipes, in addition to conventional practices, should meet the following requirements:
(1) water supply pipe on the filter.
(2) set the heat metering device or reserved installation conditions.
(3) in accordance with the needs of the General Regulation, setting the differential pressure or flow automatically adjusting device.
Note: the type of heating pipe inlet device schema, see Appendix E.
1.2.3 heating pipe inlet device set location, should meet the following requirements:
(1) no basement of the building, suitable for outdoor pipe Groove entry or staircase, the lower Chamber is set cubicle clear height should not be lower than the front operation surface 1.4m, should be not less than 0.7m waterway. Outdoor pipe Groove Chamber should be waterproof and drainage measures.
(2) in the basement of the building, set in the basement you can lock in a private space, the space in height should not be lower than the front operation surface 2.0m, should be not less than 0.7m waterway.
1.3 level dry pipe and the sharing of risers
1.3.1 water supply and return water level dry pipe design, should meet the following requirements:
(1) water supply and return water main pipe of loop should be uniform layout.
(2) the total load with risers should be similar.
(3) water supply and return water dry pipe should be set to the residential outdoor indoor unit or six common pipe trench. The present Ministry for public housing,
Allows you to set the public housing space, but should have conditions for maintenance.
1.3.2 common legislation, shall be based on the following principles:
(1) conform to the House floor and outdoor public spaces.
(2) an opposition between tube can only connect each layer a indoor system, you can connect more than one per floor indoor system. The same connection load opposition tube should be similar to the indoor system.
(3) in addition to each floor htm marshalling appliance connections household systems, a pair of common legislation attached indoor system, should not be more than 40.
1.3.3 total design with stand pipe, should meet the following requirements:
(1) shall take measures to prevent the vertical imbalance, the use of fractional twin pipe system.
(2) sharing of standpipe received to indoor system branch pipes should be set with locking and regulating function of the valve.
(3) sharing of risers should be set up outdoors and lock valve and household heat meter combination set to lock seal tube or small room.
(4) household heat meter settings in indoor, lock valve and calorie display unit should in outdoor settings.
(5) fractional twin pipe risers of vertices should set gas and exhaust outlet should be located at the bottom.
Note: there is a vertical pressure partition under fractional share the standpipe schema, see Appendix F.
1.3.4 outdoor public spaces of the building design, shall be share the vertical pipes, valves and household heat meter of reasonable setting.
1.3.5 water supply and return water dry pipe, common legislation, the use of hot-dip galvanized steel tube threaded connection.
1.3.6 for backwater dry pipe and share the risers to the indoor system, regardless of the setting prior to the contact in any space, should be enhanced by efficient insulation materials and thermal insulation.
2 indoor system design
2.1 home appliance and piping layout
2.1.1 indoor system of home appliances, should meet the following requirements:
(1) home appliance should include water supply pipe lock valve and return pipe lock valve, household heat meter, located in the heat pipe filters before the table, etc.
(2) home appliance the widget set location, determine by design. 2.1.2 when using radiator heating, according to the architectural plan and storey, decoration standards and usage requirements, pipes and construction conditions and other factors, select use the following indoor heating piping layout:
(1) layout in this layer of roof, used on double-pipe system.
(2) layout in this layer of the ground or in playSkirting the next minute double tube or horizontal in-line single-span system.
(3) layout in this layer of the ground under the cushion, the next minute double tube, horizontal-line single-span or radiation double tubular system.
Note: all indoor system schema, see Appendix G, H, I, J.
2.1.3 when using low-temperature radiant floor heating, piping design, should be consistent with the Beijing Municipal standards the low-temperature radiant floor heating application of technical procedures.
2.1.4 when used for winter heating and summer independent cold source cooling combined household air-conditioning system, the indoor heating pipes and air conditioning water system, should facilitate the heating and cooling systems to switch between, and to ensure that the households when switching independent cooling source airtight.
Note: the independent central heating and cooling with heat and air conditioning system schema, see Appendix K.
2.2 radiator and its layout
2.2.1 selection of the heat sink, should be consistent with the residential design specifications "on the" compact size, easy to clean, service life not less than steel pipe type requirements. Which, according to the type of system, the heat source and network operation and management conditions and other factors that the trade-off.
2.2.2 when using cast iron radiators, the response of the cavity radiator desanding, special requirements and reliable quality control measures.
2.2.3 the radiator arrangement, should comply with the following principles:
(1) to ensure uniform distribution of indoor temperature.
(2) and indoor facilities and furniture layout.
(3) as far as possible reduce indoor piping length.
2.3 indoor temperature regulation and control
2.3.1 the household-based heat metering, independent system should be able to ensure that residents can be independent of the implementation of lab temperature regulation and control.
2.3.2 radiator heating system of temperature control facilities, should meet the following requirements:
(1) dual-tube and pipe system, radiation-each group set high on the radiator valve or manually-operated two-pass thermostatic valve.
(2) horizontal-line single-span systems, each set heat sink sets three-way valves or manually-operated three-way thermostatic valve.
2.3.3 radiant floor heating system in the main room, you should set the branch road. Htm set equipped with device for each branch road, should set the tone
Section of the control valve.
2.3.4 when combined with winter and summer air conditioning system, air conditioner's thermostat should be provided with cooling or heating of transformation functions.
2.3.5 when sharing for backwater risers, lock valve and household calories table setting for outdoor, preferably indoors to the appropriate location in the settings manually with antifreeze function or valve self-operated total.
2.3.6 all control valve should ensure flexible adjustment and in frequent adjustment conditions without leaking.
2.4 pipe material and installation
2.4.1 indoor heating pipes out Assembly, the use of hot-dip galvanized steel tube threaded connection. Buried in the ground layer or set in the kick plates in the pipeline, according to the system working pressure, water quality requirements, materials supply conditions, construction and technical conditions and investment costs and other factors, select use the following plastic pipes:
(1) cross-plastic composite pipe (XPAP).
(2) polybutene (PB).
(3) cross-linked polyethylene pipe (PE-X).
(4) copolymer (PP-R) tube.
2.4.2 plastic pipes of performance indicators and select calculations, you can reference the Beijing standard low-temperature radiant floor heating technology with the relevant provisions of the Statute, the radiator heating systems using the condition rating of choice should be not less than 5-level requirements.
2.4.3 system adopts steel radiator, laying on the surface of the pipeline within the cushion, the use of aluminum-plastic composite pipe, or a deterrent to other oxygen-layer plastic pipes.
2.4.4 the cushion in laying pipe, should meet the following requirements:
(1) the addition of minute double tube system to connect the PB pipe radiator and pp-r pipe can be used the same material dedicated connections to melt received, pipes and other parts of all pipe should not set connection accessories.
(2) no slope laying, pipe-water flow should not be less than 0.25 m/s.
(3) upper mulch layer thickness and structure, should ensure that prevention of ground because of fracture heat action.
(4) to take reliable technical measures to prevent the ground second decoration were damaged.
(5) radiation double tube system set with appliance Department htm pipeline-intensive parts, to set up flexible casing and other insulation measures.
2.4.5 upper space indoors or out along the ground, loading of piping should be arranged in an orderly, compact layout, easy to use construction decoration coating, shall block the channel and other indoor facilities or rational arrangement of the furniture.
3 system hydraulic calculation
3.1 outdoor systems
3.1.1 user secondary water side outdoor network most negative loop pipes than friction, it is not greater than 60pa/m, and the pressure loss, and should not greater than the total heat source outlet pressure of 1/4.
3.1.2 and most negative loop in parallel with other loop pipes than the friction and pressure loss, and should, in accordance with the principle of hydraulic balance.
3.1.3 should calculate the outdoor network in each building heating population-with differential pressure to control indoor system of total pressure loss, correct choice entry regulation device.
3.2 indoor system and indoor systems
3.2.1 indoor system and indoor system of total pressure loss should be determined by the following:
(1) the most adverse indoor system pressure loss.
(2) since being work force to the entrance of the building heating, indoor system pressure loss.
(3) the above two pressure loss of 10%.
3.2.2 indoor system and indoor systemsThan friction, should be based on the hydraulic balance between parallel loops and control building heating Portal-determined by differential pressure.
3.2.3 indoor system and indoor system parallel loop between the relative difference between the calculated pressure loss, shall be not greater than 15%. When the conditions cannot be met, you should set the necessary adjustment widget.
3.24 parallel loop between the hydraulic balance, accrual and vertical sharing risers of gravity head. Gravity-head values as designed for water temperatures gravity head value calculation of 2/3.
3.2.5 indoor system including lock valve and household calories table, calculate pressure loss, and should be controlled at ≤ 30kPa.
Note: the plastic pipes for hydraulic calculation, see appendix L.
3.2.6 when indoor use horizontal concatenation of single-tube spanning system, you should order calculation of temperature drop, determine the number of the heatsink.
4 heat metering device
4.1 General requirements
4.1.1 residential household heat metering, should be used to heat enthalpy difference and mass flow over a certain period of time the direct measurements of integral.
4.12 by flow meter, temperature sensor and thermal of integral monitor consists of three parts, thermal and electrical integration instruments, and other related table accessories combined, form the heat metering device.
4.1.3 thermal measurement devices should be distinguished: household heat meter, building heating and the heat source population calorimeter heat meter.
4.1.4 household metering various heat metering device of precision, the overall accuracy and other technical requirements, should be consistent with the provisions of the relevant national standards. In the national standards is not officially released before, should refer to the adoption of the relevant foreign advanced standard.
4.1.5 domestic research and development of products, through the identification of provincial-level and above. Production enterprises should have the manufacturing license for measuring instruments. The various products at home and abroad, shall be approved by the national quality technology supervision Bureau accepted, provincial and higher inspection body check and obtain the measurement instruments pattern approval certificate.
4.1.6 heat metering device of choice, should meet the following requirements:
(1) under a single heating or heating and cooling requirements of different languages, different selection of corresponding heat meter.
(2) temperature performance should be installed in htm's maximum operating temperature.
(3) pressure should not be lower than the installation location htm 1.5 times the working pressure.
(4) the use and installation conditions consistent with the product specification requirements.
4.2 household heat meter
4.2.1 should be system design flow corresponding to the rated flow of heat meters, select determines household calories table of specifications.
4.2.2 household calories table of flow meter and its settings, should meet the following requirements:
(1) the use of rotary-wing flow meter that can also be used in Ultrasonic Flowmeter.
(2) should be set to the water supply pipe.
(3) the rated flow of the water resistance, water is greater than 25kPa.
(4) before configuring the filter in the table.
4.2.3 household heat meter with temperature sensor and its settings, should meet the following requirements:
(1) the use of heat meter factory in matching supply of pairing sensors.
(2) should use directly into the pipeline of short probes or can probe directly into the ball.
(3) when you need to set to indoor should adopt an integrated temperature sensor built-in.
4.2.4 household calories table should use the built-in battery, effective service life not less than five years.
4.3 building heating and the heat source entry calorimeter heat meter
4.3.1 to press system design flow of 80% of the rated flow calorimeter, select the table to determine the thermal building entrances and heat heat meter
The model specifications.
4.3.2 building entrance to thermal and heat flow meters and heat meters of the set, should meet the following principles:
(1) diameter is 50 ~ 65mm should adopt mechanical rotor flowmeter. Diameter 80 ~ 150mm should use Ultrasonic Flowmeter or mechanical horizontal or vertical screw rotor flowmeter. Diameter ≥ 200mm should use Ultrasonic Flowmeter.
(2) should be set to the return pipe.
(3) rated traffic flow resistance, it is not greater than 20kPa.
4.3.3 building entrance to thermal and heat heat meter, temperature sensor pair should be strictly in accordance with the necessary product installation requirements set.
4.3.4 building entrance heat meter use built-in battery, heat heat meter can be plugged in.
4.3.5 building entrance heat meter use flowmeter and integral instrument-as one of the integral, heat heat meter use flowmeter and integral instrument separation unit.