On flow and supply temperature control in district heating systems

Field investigation on consumer behavior and hydraulic performance of a district heating system in Tianjin, China

“…Although there has been much research [21][22][23][24][25] concerning the dynamics of DHSs, the hydraulic performance of DHSs controlled by TRVs has received less attention. For example, the simulation of flows and temperatures in thermal-hydraulic networks, especially in large-scale networks, is often done by assuming a quasi-dynamic approximation between flow and temperature [25]; that is, the flow is computed independently from the temperature distribution, and the temperature is computed by assuming constant flow in the whole network.…”

Evaluation of the most influential parameters of heat load in district heating systems

“…Primary supply and return temperatures, thermal energy, power and flow on primary side, as well as outdoor temperature, were measured at 15 Prior to analysis, data were averaged at 1-hour intervals. Data cleaning and preprocessing was not performed.…”

“…In [14] different parametric and non-parametric heat load prediction models were discussed and used. In [15] general transfer function models for different prediction horizons were proposed for control purposes. Dotzauer [16] modeled heat load using the assumption that heat demand can be described sufficiently well as a function of outdoor temperature (piecewise linear function) and the social component.…”

Simulation-Based Method for Supply Temperature Optimization in District Heating System

“…Первым вариантом решения этой задачи стало составление температурных графиков зависи-мости температуры теплоносителя от температуры наружного воздуха [5,6]. Данное решение хорошо зарекомендовало себя на практике.…”

“…В этом случае на тепловых станциях применяется качественное регулирование, при котором подача тепловой энергии регулируется посредством изменения температуры подаваемого теплоносителя [4]. В связи с этим появилась задача поддержания оптимальной температуры теплоносителя на выхо-де источника тепла, достаточной для предоставления всем потребителям требуемого количества тепловой энергии.Первым вариантом решения этой задачи стало составление температурных графиков зависи-мости температуры теплоносителя от температуры наружного воздуха [5,6]. Данное решение хорошо зарекомендовало себя на практике.…”