3.0.2 This article is mandatory. The heat settlement between heating enterprises and end users should be based on heat meters. The heat meter for settlement shall meet the relevant national product standards, and the metrological verification certificate shall be within the validity period of verification.
3.0.3 Nine articles, such as the Metrology Law of People's Republic of China (PRC), stipulate that the metrological administrative department of the people's government at or above the county level shall carry out compulsory verification on the public standard measuring instruments, the highest standard measuring instruments used by departments, enterprises and institutions, and the working measuring instruments listed in the compulsory verification catalogue of trade settlement, safety protection, medical and health care and environmental monitoring. Those who fail to apply for verification according to regulations or fail to pass the verification shall not be used. The catalogue and management measures of working measuring instruments subject to compulsory verification shall be formulated by the State Council. Other standard measuring instruments and working measuring instruments shall be regularly verified by users themselves or sent to other metrological verification institutions for verification, and the metrological administrative department of the people's government at or above the county level shall conduct supervision and inspection.
According to "Metrology Law", the heat meters used in thermal settlement points should be checked first and periodically, and the heat meters and heat distribution meters not set in thermal settlement points, such as radiator heat distribution meters, should have qualification certificates and type inspection certificates according to product standards.
3.0.4 Household metering and energy-saving renovation should adopt technical and management means, and indoor thermal comfort should not be sacrificed blindly for energy-saving heating, or even the room temperature is not up to standard. Of course, it is unreasonable that the indoor temperature is too high, and there is no need to keep the original room temperature too high when decorating.
6 technical specification for heating metering
3.0.5 Only under the premise of hydraulic balance, climate compensation and indoor temperature control metering can play an energy-saving role and truly reflect the energy-saving effect at the heat source; Among these energy-saving technologies, hydraulic balance technology is the premise of other technologies; At the same time, the indoor temperature control reconstruction of existing houses has a large amount of work, which also interferes with residents' lives. It should be carried out on the premise that the external network energy saving of heating system and the thermal insulation and energy saving of building envelope meet the standard.
This paper advocates giving priority to heat metering in reconstruction projects, so as to quantitatively evaluate the reconstruction effect, avoid false propaganda and other behaviors, encourage fair energy-saving market and create good market conditions for energy services. At the same time, while paying attention to heat measurement, we should also pay attention to the itemized measurement of heat source water consumption and power consumption.
3.0.6 The selection of heat meter should be based on flow and pressure drop, not directly based on pipe diameter. Theoretically speaking, the design flow is the maximum flow, and the flow should not reach the design flow when the heating load does not reach the design value. Therefore, most of the working time of the heat metering device is below the design flow, so according to experience, this article suggests that the heat meter should be selected according to 80% of the design flow. When selecting the heat meter, whether the flow range, design pressure and design temperature of the heat meter are suitable for the design conditions are ignored, and the heat meter is selected according to the pipe diameter rather than the flow range of the instrument, which leads to the heat meter working in the high error zone. Generally, the indicators that represent the flow characteristics of heat meters mainly include initial flow qVm (some data are called minimum flow); Minimum flow qVt, that is, the flow from the maximum error zone to the minimum error zone (some data are called boundary flow); Maximum flow qVmax, rated flow or ordinary flow qVc. When selecting heat flow timing, it should be ensured that its flow always works between qVt and qVn. Flow characteristics of mechanical heat meter.
Installing a flow sensor on the reflux pipe is beneficial to reduce the ambient temperature of the instrument, prolong the battery life and improve the working conditions of the instrument. It has been suggested that installing a heat meter in water supply can prevent users from stealing water. In fact, only installing a water supply meter can't measure the stolen water, nor can it recover the loss of stolen water, and it will also make the working environment of the heat meter worse.
This article stipulates that the heat meter should store the daily heat supply of the local heating season, so as to facilitate the inspection and traceability of the operation and management level in the heating season. In the case of disputes between residents and heating enterprises on heating effect, it can be judged retrospectively by heat meter, and there have been successful cases in Beijing; By comparing the outdoor measured daily average temperature records with daily heating records, we can check whether the actual operation of heating enterprises is actively regulated according to meteorological changes. This paper puts forward that the heat meter has the function of data remote transmission and expansion, and it is also convenient for monitoring, management and meter reading.
Usually, in order to meet the requirements of instrument measurement accuracy, a straight pipe section is needed. In some places, although the heat meter is equipped with a straight pipe section, it is wrong to set a variable diameter section between the straight pipe section and the meter. Installing some heat meters can ensure the measurement accuracy without straight pipe sections, which is also feasible and very useful for the reconstruction project of heating system. In the case that the history is not indicated by the instrument manufacturer, the length of the straight pipe section on the upstream side of the heat meter should not be less than 5 times the pipe diameter, and the length of the straight pipe section on the downstream side should not be less than 2 times the pipe diameter.
This happened during the pilot test. Because the clock calibration of heat meter is inconsistent, there is an error in statistical data processing, which affects the work, so I would like to remind you.
3.0.7 At present, counterfeit thermostatic control valves and balance valves occupy a high proportion in the market. Many manual valves pretend to be thermostatic control valves, and many valves without pressure taps and measuring instruments also pretend to be balance valves. These fake and shoddy products can not achieve the function of regulation, but also waste a lot of energy. The purpose of this article is to require strict management.
3.0.8 At present, the water quality problem of central heating is more prominent, which leads to frequent problems such as radiator corrosion, water leakage and control equipment blockage. It is urgent to formulate reasonable and feasible standards and strictly implement them, and the national standards for system water quality requirements are being formulated.