Abstract More detail on the principle of measuring the heat and the heat of several common measurement methods.After the analysis and comparison, a k a coefficient of compensation methods of measurement, and the k coefficient of temperature and pressure compensation for on-line, have a high accuracy are given specific examples of calculation and its results.

Keywords Heat measurement Heat Meter Heat transfer coefficient Online compensation

For a long time, urban residents in China's northern region in general by thermal heating the residential area rather than the actual measurement with the heat charges, leading to poor awareness of energy users, resulting in a waste of resources. Clearly the lack of scientific methods of measurement. And Europe and the United States and other developed countries in the early 1980s, the use of heat meters have been quite common, thermal heat meters to the company as the basis for the valuation fees and means, energy saving 20 percent to 30 percent. As a basic building energy conservation measures, the Ministry of Construction of China's national energy measures have been included in the charges "building energy efficiency," 9th Five-Year "Plan and the 2010 plan." Therefore, the research and development accounted for heating the heat meters inevitable .

Heat Meter general should have the following technical requirements ۣ :

an overall accuracy of OIML R75 provisions of the four standards;

part of the flow meter accuracy, error <3%;

temperature sensors used platinum resistance temperature measurement components, with a 751 IEC standards and accurate matching, when the temperature difference for backwater in less than 6 , the measurement error <0.1 ;

heat meters with hot flame density and quality certification of the repair function, error is less than 0.5 percent;

micro-power design, containing batteries can work for five years.

China now on the market abroad Heat Meter technology is mature, a high degree of standardization, but more expensive. China's demand for heat meters, research and development of low-cost, in line with international standards of the Heat Meter is a general trend. In this paper, heat meters based on the principle of measuring the heat on the heat of several commonly used measurement methods, analysis and comparison of the respective advantages and disadvantages, discussed in detail with k coefficient of thermal measurement compensation method for achieving a coefficient of temperature and k Online pressure compensation, so they have high accuracy.

1 measurement principles of heat

Heat Meter is a measure applied to the heat exchange loop, contained liquid absorbed by the heat or thermal energy conversion devices, heat meters with the statutory units of measurement shows that the heat ۣ . Table also called thermal heat meters, thermal Totalizer for both the heating system for measuring the heat can measure heat absorption cooling system.

Will be one pair of temperature sensors were installed in thermal fluid, as the uplink and downlink of the tube, the fluid flow meter installed at the entrance or on the back of the (flowmeter installation of different positions, the ultimate measurement results are also different), with a flow meter Traffic is directly proportional to the pulse signal, a temperature sensor is that the temperature difference between analog signal, heat meters from the three-way acquisition sensor signals, calculated using the formula Totalizer heat exchange system was the heat.