This paper highlights the problem of determining the durability of water heating systems based on a comprehensive analysis of oxygen permeability and corrosion processes. The focus is on electrochemical corrosion of the steel elements of the system. Such types of corrosion as general, local, pitting and ulcerous are considered. Various experimental data were analyzed and quantitative dependences of corrosion rate, corrosion permeability and depth of ulcer corrosion depending on coolant temperature and dissolved oxygen concentration were obtained from them. For water heating systems with polymer pipes without an oxygen barrier, a methodology for calculating the dynamics of oxygen concentration in the coolant has been proposed. A criterion for assessing the durability of the system has been developed, which connects the accumulated depth of peptic ulcer corrosion with the wall thickness of the most thin-walled element. It has been shown that the durability of the system directly depends on the initial oxygen content and oxygen permeability of polymer pipes. The proposed method makes it possible to predict durability and plan equipment replacement, preventing accidents.

Keywords: corrosion, pitting corrosion, heating systems, polymer pipes, heat carrier, oxygen permeability, durability

The schematic solution of the heating system is analyzed, as well as possible variants of design solutions. A multi-variant hydraulic mode of operation of the heating system of an apartment building is simulated on a simulator stand. The results of the experimental study are presented, and based on the change in design costs and the value of the adjustable pressure drop in parts of the system, proposals are made that allow reducing the cost of water heating systems of buildings under construction, as well as suggesting an increase in the simplicity of adjustment and quality of system regulation.

Keywords: water heating system, oxygen permeability, gas permeability, polymer pipes, gas solubility

Modern designs of water heating systems are saturated with different types of regulators, but their use is more often justified not by a systematic approach, but by solutions necessary for the operation of the system in its individual parts. The objectives of the presented work are to obtain and systematize experimental data to study the variable hydraulic mode of operation of horizontal water heating systems using apartment stations. In this paper, a problem in the field of development of modern water heating systems that needs to be solved is formulated. The analysis of the schematic solution of the heating system, as well as possible design options, was carried out. A simulation of the multivariate hydraulic mode of operation of the heating system of an apartment building was carried out on the simulator stand. The results of an experimental study are presented, and based on changes in design costs and the value of the adjustable pressure drop in parts of the system, proposals are made to reduce the cost of water heating systems for buildings under construction, as well as suggesting an increase in the ease of setup and quality of system regulation.

Keywords: balancing fittings, hydraulic characteristics research, water heating system, automatic regulators