Investigating the dynamic mode of a heating system operation

Summary

Main specifications of the hydraulic mode of the advanced heating systems are given. The standard hydraulic calculation does not provide for the complete amount of information on the heating system operation. Accordingly a mathematic instrument (software-model) was developed to calculate a hydraulic circuit of an advanced heating system in a transit mode of operation. Hydraulic calculations of the two heating systems of similar structure, however, equipped with different balancing fittings were carried out. Typical tendencies of the system active elements operation were analyzed. Recommendations on specific use of the control valves were formulated.

Key words

flow rate , pressure drop , hydraulic condition , heating system , resistance characteristic , thermostatic control valve , balancing valve

Device of Proportional Dozing of Reagents for Water Supply Systems

Summary

Devices of the dozing of reagents (complexions) making it possible to reduce expenses for water treatment, reduce the rate of pipelines corrosion, remove salt sediments from inner surfaces of pipes and heat exchanging apparatuses are used widely in the last years at boilers, heat supply systems and hot water supply systems. Shortcomings of ejection and injection systems of reagents dozing are described. A device ensuring the permanent pressure control in a pipeline where dozing is carried out and limiting the maximum time between the introductions of regular dozes of reagent is proposed.

Key words:

salt sediments , water treatment unit , pressure drop , reagent , dozing pump , flow meter , injection systems