From the beginning of heating season utility payments considerably increase. And it is not always justified. The fact is that usually owners of apartments pay for heat rate on average indicators. Therefore, it is useful to install thermal counters which give economy of funds for payment to 40% in the house. Installation of counters is carried out on pipes of input and output of the heat carrier. In multifamily houses with stoyakovy distributing heat counters usually are installed popodjezdno in basements.
1. Today the State registry of SI recommends to installation about 200 types of heat meters. Its choice depends on many indicators. Of course, the type of the heat meter depends on type of the heat carrier and the scheme of thermal input. For right choice it is necessary to know the maximum flow of the heat carrier, information on which the heatsupplying organizations possess. For determination of number of primary converters and model of the heat meter it is necessary to have information on the number of thermal inputs and type of the GVS system. Differential pressure parameter in direct and return pipelines of heating system also is essential.
2. Secondly, for the choice of the heat meter consider its computing opportunities and characteristics. So, the warmth measurement error on the established norms has to be no more than ±4% at the difference of temperatures in pipelines more than 20 °C, and measurement error of mass of the heat carrier no more than ±2%.
3. Thirdly, consider the range of changes of expense, temperatures and the difference of temperatures. It is necessary to tell that all counters of heat certified today conform to regulatory requirements concerning ranges of changes. They fix change of expense of the heat carrier, its temperature and its difference.
4. The fourth rather serious criterion for selection of the heat meter is the pressure loss on it. Practically all counters have hydraulic resistance that at their installation creates pressure losses in pipelines.
5. Important factor when choosing the counter of heat is also its method of installation. So, many of them demand availability of essential sites of the direct pipeline (to 10 m) that is not always feasible in basements and premises.
6. Choosing the heat meter, pay attention and to its registration mode, to simplicity of service, the clear interface, availability and depth of archive, intertest interval. Important factor is also heat counter price.