THE PURPOSE.Consider the effect of heating system turning off process on the engine room thermal density in a high-voltage city sewage pumping station. Determine how the heating system shutdown affects to the considered room thermal regimes with unchanged requirements for the indoor air microclimate thermal and moisture parameters. Do a numerical experiment which simulates the stationary thermal regime of engine room and taking into account the main technological process in this room of a high-voltage city sewage pumpingstation. Perform adaptation of thermal regime developed model to simulate the heating system turning off process. Describe the distribution of heat losses in the engine room while maintaining a constant air temperature. METHODS. When solving the task, author has used the method of calculating the engine room design stationary mode.RESULTS.Researcher describes the relevance of the topic, considers the specials of the change in the engine room thermal density when the heating system is turned of and other factors. Author has presented the results of the thermal excesses calculation for different numbers of operating pumps and changes in wastewater temperature.CONCLUSION.The turning off process of the heating system reduces the thermal density of the engine room by an average of 0.3 - 0.4 W/m³. This method of energy saving helps to reduce the consumption of thermal energy and could be used in this part of sewage pumping station. The economical effect of proposed energy saving measurement will be in economical index reducing. It will be 890 000 rubles saving per year for this type of sewage pumping station in designed mode.

Modern sewage plant is a complex engineering structure with a different configuration of functional sectors (zones). The inlet sections to the pumps operate in a gravity flow mode, characterized by incomplete filling of the section with water, based on the requirements of non-absorption of ventilation safety for the resulting gas, mainly methane. As the liquid and gas have a higher temperature than the air temperature in the premises of the pumping stations. The problem of heat flow from the fluid have to be solved by a specially designed method that takes into account the separation of gas and liquid flows in pipes and rectangular channels by applying the theory of similarity, criteria equations and computational experiment. An important circumstance in the structure of the algorithm of the calculation is finding and using the concept of the wetted perimeter, as well as newly introduced in the article the concept of the average heat transfer coefficient with respect to the specific configuration of each element partially filled with liquid. Pumps and pipes after them as usual completely filled with water, but here in turn, we have to consider a special form of surfaces of equipment and fittings drainage systems.

In this paper, we analyzed the thermo-physical properties of landfill gas, which can be used in the system of communal services of the city from specialized landfills for collecting municipal solid waste. Authors do not yet consider ways of delivering this type of fuel to subscribers, but imply as an option of possible technologies that there is a storage facility and an industrial factory for cleaning and condensation landfill gas for further use in the communal system of the city. There are Graphs of changes in various indicators of landfill gas in this article. This study can be used to predict energy conservation not only of large cities, but also of small settlements from the use of an alternative energy source - landfill gas. Its main characteristic (in terms of thermal physics) is the lower calorific value of the fuel. It depends on the composition and moisture of the gas. The report discusses the methodology for studying the lower calorific value of landfill gas, based on the chemical balance of this fuel. Another important characteristic is the environmental effect. Reducing emissions of landfill gas decrease the greenhouse effect, which has a negative impact on the Earth’s atmosphere, biosphere and hydrosphere. It could be provided for the production of electrical energy, as well as a combination of electric and thermal. There is the possibility of producing hydrogen for a fuel cell. However, this requires independent economic, environmental and energy comparison of various technologies for using of landfill gas in the engineering infrastructure of the city, as well as different methods of transporting and producing energy-efficient condensate compressed landfill gas (the best option when the methane content in this fuel is like natural gas).

There are a various energy-saving measures for climate control systems in the city sewage pumping station (SPS) are considered in this paper. All consumers and sources of thermal and electric energy in SPS are classified according to various characteristics. There are the positive and negative features of thermal and electrical energy sources are considered. The differences between the set of consumers in the sewage pumping station and the pumping station of the cold water supply system of the settlement are shown by authors. There are possible sources of thermal and electric energy, as well as frequently occurring renewable sources of thermal energy for SPS. It has been shown the search results of all possible energy saving measures that can be used not only in the sewage pumping station, but also in the pumping station of the water supply system of settlements, as well as in pumping stations for reclamation needs in this article. Authors also in this work have considered a number of domestic methods for assessing the energy consumption of a building and assessing the impact of energy-saving measures on the overall energy consumption of a building because at the moment there are not unified techniques on these topics.

Рассмотрены особенности работы тепловых насосов на сооружениях системы водоотведения города. Приведены конкретные примеры установки тепловых насосов на различных объектах системы канализации в Российской Федерации. Исследованы альтернативные источники получения тепловой и электрической энергии для очистных сооружений. Изучены возможности использования теплоты от сточных вод для различных теплопотребляющих инженерных систем обеспечения микроклимата зданий или сооружений системы водоотведения. Проанализированы иные возможности использования теплоты от сточных вод для других инженерных систем жилищно-коммунального хозяйства. Проведена углубленная проработка возможностей монтажа тепловых насосов на канализационной насосной станции. Даны положительные и отрицательные особенности эксплуатации теплового насоса, зависящие от потенциального расположения оборудования конденсаторно-испарительных блоков теплового насоса на канализационной насосной станции. Освещены особенности устройства тепловых насосов на низковольтных и высоковольтных канализационных насосных станциях в различных населенных пунктах и городах. Представлены результаты изучения основных технологических проблем на реальных объектах системы городского хозяйства и описаны основные осложнения, возникающие в процессе монтажа и эксплуатации тепловых насосов на канализационных насосных станциях. Данное обследование проходило с 2019 по 2021 гг. на канализационных насосных станциях АО «Мосводоканал», где используются тепловые насосы. Выполнен анализ возможности снижения стоимости производства теплонасосного оборудования на базе существующих отраслей энергетики (например, геотермальной энергетики) и промышленного сектора экономики Российской Федерации. Работа может быть интересна для проектировщиков и инженеров, работающих в сфере энергетики, жилищно-коммунального хозяйства города, в частности, в системе городского водоотведения.