Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Конференция: International Scientific Conference on Precision Agriculture and Agricultural Machinery Industry , INTERAGROMASH 2021
Год издания: 2022
Идентификатор DOI: 10.1007/978-3-030-80946-1_29
Ключевые слова: design, flow, indoor, network, outdoor, pipe, pipework, pressure, return
Аннотация: One of the fundamental considerations in space heating (SH) consists in the variability of heat loads over time as result of external conditions. This paper shows the novel way to adapt a variable-flow system provide space heating (SH) and domestic hot water (DHW) to multiple buildings with varying loads. It would be ideal to proviПоказать полностьюde only as much heating and DHW as the zone actually requires at any particular moment. Constant-volume systems come close to this ideal. One needs to know both indoor and outdoor design temperatures, mixed-water temperature, and the required sensible and latent heat loads. Only through analyzing the real network behavior one can gain useful insights related to the consumption patterns of the users. The investigated district heating (DH) system of Zavertyaevo District, Omsk, Russia consists of pipework within a concrete surface trench covered with earth, and two gas boilers with a rated SH supply capacity of 13.3 MW and design efficiency of 82.6%. This system is considered in a case where the SH temperature equals 70 °C and the post-SH return temperature equals 55 °C. This part is related to an idea based on combining lower supply/return temperatures and local heat pump placement, which is in line with the abovementioned LTDH concept. When maximal water flow is reached, if the zone is still too cool, SH is partially provided by a thermostatically controlled electric heater or a heat pump. This means there may be some energy wasted in the constant-volume system due to simultaneous electric heating and drops in the supply temperature. However, this energy waste is far less significant than in variable-flow systems, since the supply temperature is reduced to a minimum before the warm weather starts. These control operations can be summarized in the following chart often referred to as control logic. Advantages of constant-volume systems include low capital costs and low maintenance costs, whereby the former become lower as the system can use the current pipeline dimensions and only requires a simple control at the plant and at the substations to be placed while renovated; the latter costs are lower because the constant volume of water, and thus the boiler capacity and pump power closely follow the actual building-specific heat consumption. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Журнал: Lecture Notes in Networks and Systems
Выпуск журнала: Vol. 247
Номера страниц: 287-297
ISSN журнала: 23673370
Издатель: Springer Science and Business Media Deutschland GmbH