3. 1 General provisions

3. 1. 1 In order to save energy for heat users' behavior, the indoor heat metering method should be reasonably selected in the heat metering design of new residential buildings. The indoor heat metering methods of residential buildings include: household heat meter method, heat distribution table method and so on.

1. Measurement and allocation method of household heat meters: the heat supply of each household measured by household heat meters can be used as the basis for the settlement of heat metering fees, or household heat meters can be used to measure the heat supply of each household and calculate the heat consumption ratio of each heat user, so that the total heat supply measured by the total heat meter of a building or thermal station can be allocated to each household according to this ratio.

2. Distribution method of radiator heat distribution meter: According to the corrected test data of each radiator heat distribution meter, calculate the heat consumption ratio of each heat user, and distribute the total heating of the building or the total heating of the thermal station according to this ratio.

3.2 Building heat metering design

3.2. 1 A heat meter shall be designed and installed at each hot entrance of a new building, or a heat meter shall be designed and installed in the main heating pipeline of a single building as the heat metering basis of the building; For new buildings with the same building use, type and envelope structure and the same heat metering method in the building, a heat meter can be designed and installed in the main heating pipeline as the basis for heat metering of multiple buildings.

3.2.2 Newly-built buildings should design special rooms as building heat meter rooms, with the clear height of basement not less than 2.0m and the clear width of front operation surface not less than 0.8m Small rooms can also be designed as building heat meter rooms at the entrance of outdoor pipe trench or the lower part of stairwell. The clear height of the meter room shall not be less than 1.4m, and the clear width of the front operating surface shall not be less than1.0m. The outdoor pipe trench meter room shall be provided with waterproof and drainage measures.

3.3 Indoor heat metering design

3.3. 1 The indoor heat metering method for newly-built residential buildings is suitable for indoor heating systems.

1. The household horizontal double-pipe or single-pipe radiator system with cross pipes and the household floor radiant heating system can choose the heat meter mode.

2. Indoor heat metering of vertical or horizontal double-pipe system and single-pipe system with cross pipes can choose the configuration mode of heat meter.

3.3.2 The same indoor heat metering method and the same type of heat metering device should be used to settle the heat consumption according to the total heat meter at the hot entrance of the building.

3.3.3 The design and selection of heat metering devices shall meet the following requirements (applicable to the whole central heating system):

1. The selection of heat metering device should take the design flow as the rated flow.

2. The flowmeter of heat metering device shall be designed and installed on return pipe.

3. The measurement results of heat meter should be consistent.

4. A filter should be designed and installed upstream of the heat metering device to ensure that the normal operation of the heat metering device is not affected by impurities such as scale and rust in the system pipeline.

5. The design and installation position of the heat metering device shall meet the requirements that the length of the straight pipe section on the upstream side of the heat meter is more than 5 times the pipe diameter and the length of the straight pipe section on the downstream side is more than 2 times the pipe diameter.

6. The conductor sections and lengths of cables used for paired temperature sensors of heat metering devices shall be designed according to the same requirements, and the sensor cables shall not be trimmed after leaving the factory.

7. The heat metering device for heat fee settlement shall conform to the standard of Heat Meter (CJ 128-2007), and the manufacturer shall obtain the License for Manufacturing Measuring Instruments or the Type Approval Certificate of Measuring Instruments in People's Republic of China (PRC).

8. The accuracy of heat metering device for heat fee settlement should be higher than Grade 3, and it should have the function of remote transmission of heat metering data and the storage performance of heating for more than 200 days per day.

3.3.4 In the design, the corresponding performance parameters of the metering device should be specified according to the actual situation.

The performance parameters of 1. integrator include: ambient temperature, ambient humidity, protection level, temperature difference range, sensitivity, communication function, recording interval, power supply mode, battery life, etc.

2. The performance parameters of the flow sensor include: straight pipe section requirements, measuring range, resistance value, nominal pressure, installation direction, connection mode, length, etc.

3. The performance parameters of the temperature sensor include: temperature measuring range and temperature difference resolution.

3.3.5 The heat distribution table shall meet the following requirements:

1. The products and installation methods of the heat distribution table shall conform to the product standards of electronic heat distribution table (CJ/T260-2007) and evaporative heat distribution table (CJ/T27 1-2007).

2. When using evaporative heat distribution meter or single sensor electronic heat distribution timing, the average design temperature of radiator heat medium should not be lower than 50℃; Using heat of vaporization distribution timing, different colors of evaporation liquid should be used in different heating seasons.

3. The use and maintenance of heat meters should minimize the interference to users.

3.3.6 A thermostatic control valve should be designed and installed at the entrance of each radiator in a new building to realize room temperature adjustment. For low-temperature hot water floor radiant heating system, automatic temperature control regulating valve should be designed and installed at the entrance of indoor system to realize centralized temperature control by households, and manual flow control valve should be designed and installed on each loop of indoor distribution main pipe.

3.3.7 The selection of thermostatic control valve in indoor heat metering design shall meet the following requirements:

1. The vertical single pipe plus cross pipe system can be designed with low resistance bidirectional thermostatic control valve or three-way thermostatic control valve; The vertical double-pipe system should be designed with thermostatic control valve with preset resistance function to eliminate vertical deviation.

2. When the heating system is in normal flow under design conditions, the thermostatic control valve should not generate noise and the water flow should not be blocked.

3. The thermostatic control valve should have the function of hydraulic plug removal or valve core replacement (the operation manager can use special tools to operate).

4. The product quality and installation method of thermostatic control valve shall conform to the standard of Constant Temperature Radiator Valve (JG/T 195-2007), and shall have the product certificate, instruction manual and performance test report issued by the technical supervision department; Its adjustment characteristic curve should meet the requirements of product standards.

3.3.8 The radiator selected for heat metering design of new buildings shall meet the following requirements:

1. The radiator form of the whole building should be consistent.

2. Steel and aluminum radiators should not be used in the same heating system.

3. The radiator should not be equipped with a radiator cover.