Optimal operation of novel hybrid district heating system driven by central and distributed variable speed pumps

Gong, Enwen; Wang, Na; You, Shijun; Wang, Yaran; Zhang, Huan; Wei, Shen

doi:10.1016/j.enconman.2019.06.004

Cited by 26 publications

(22 citation statements)

References 16 publications

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“…The improvement method is still being improved on the basis of centralized control, the calculation amount is large, and the adjustment time is too long. In view of the pressure imbalance of the heating and water supply pipeline, the researchers conducted distributed control on the circulating water pump of the heat exchange station to reduce the pressure imbalance of the pipeline, and evaluated it from the aspects of thermal and economic benefits to achieve better heating effect [32][33][34] . However, when the topology of the heating pipe network changes, the balance between the pipelines will be broken again, the original control method is no longer suitable for the new topology [35] .…”

Section: Literature Reviewmentioning

confidence: 99%

Distributed model predictive control for central heating of high-rise residential buildings

Zhou

Zhao³

2022

Journal of Asian Architecture and Building Engineering

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Central heating system faults affect building energy consumption and indoor thermal comfort significantly. To aim at the balance between thermal comfortable and energy-saving of the heating system for high-rise residential buildings, this paper proposes a method for the central heating system of high-rise residential buildings based on distributed model predictive control. The method analyzes the coupling factors between adjacent rooms' temperature. Based on the state space method, a multivariable indoor temperature model is established and verified.The distributed model predictive control method is used to control and optimize the indoor temperature, and the load distribution of the circulating water pump in the heat exchange station is optimized according to the predicted heat demand. The results demonstrate that the indoor temperature after distributed model predictive control can stable near the set value. Compared with the centralized control methods, the proposed methodology can reduce energy consumption by 14.28%. Meanwhile, the efficiency of water pumps is increased by 16.74% after using the distributed control strategy.

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Section: Literature Reviewmentioning

confidence: 99%

Distributed model predictive control for central heating of high-rise residential buildings

Zhou

Zhao³

2022

Journal of Asian Architecture and Building Engineering

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“…A feedback controller handles each pump Ph-I, and the controller is designed to meet the user's demand for the thermal flow rate by employing the minimum water flow rate. The adoption of such an approach is able to reduce the pumping power consumption and to enhance the energy performance of the district network [21,22].…”

Section: System Layoutmentioning

confidence: 99%

“…A PV plant of 9397 m 2 supplies renewable power to the district to meet a share of the electricity demand, including the power delivered to the auxiliary hydraulic systems. Since the adoption of variable speed pumps enhances the energy performance of thermal districts [21,22], each branch of the district employs two 80 m 3 /h pumps with fixed speeds and one 80 m 3 /h pump with variable speed equipped with an inverter. The third proposed system for the district of Naples (PS3 N; Figure 1 and Table 7) is the same as Fayoum.…”

Section: Case Studymentioning

confidence: 99%

Energy and Economic Assessment of Energy Efficiency Options for Energy Districts: Case Studies in Italy and Egypt

et al. 2021

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In this research, a technoeconomic comparison of energy efficiency options for energy districts located in different climatic areas (Naples, Italy and Fayoum, Egypt) is presented. A dynamic simulation model based on TRNSYS is developed to evaluate the different energy efficiency options, which includes different buildings of conceived districts. The TRNSYS model is integrated with the plug-in Google SketchUp TRNSYS3d to estimate the thermal load of the buildings and the temporal variation. The model considers the unsteady state energy balance and includes all the features of the building’s envelope. For the considered climatic zones and for the different energy efficiency measures, primary energy savings, pay back periods and reduced CO2 emissions are evaluated. The proposed energy efficiency options include a district heating system for hot water supply, air-to-air conventional heat pumps for both cooling and space heating of the buildings and the integration of photovoltaic and solar thermal systems. The energy actions are compared to baseline scenarios, where the hot water and space heating demand is satisfied by conventional natural gas boilers, the cooling demand is met by conventional air-to-air vapor compression heat pumps and the electric energy demand is satisfied by the power grid. The simulation results provide valuable guidance for selecting the optimal designs and system configurations, as well as suggest guidelines to policymakers to define decarbonization targets in different scenarios. The scenario of Fayoum offers a savings of 67% in primary energy, but the associated payback period extends to 23 years due to the lower cost of energy in comparison to Naples.

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“…However, when the DVSP system was applied to the large-scale pipe network and when the pipe network is in areas with large elevation differences, the working pressure at the far-end of the heating pipe network is too high, bringing certain hidden dangers to operational safety. Gong et al 24 evaluated a new hybrid drive system (hereinafter referred to as hybrid system) based on the original DVSP system, which uses a combination of DVSPs and regulating valves, and introduced an optimal control strategy for the new system. The results show that when the proposed system is applied to a large-scale pipe network, the pressure level of the pipe network can be reduced, and the safe operation of the heating pipe network can be guaranteed.…”

Section: Introductionmentioning

confidence: 99%

Optimal diameter of district heating pipe network based on the hybrid operation of distributed variable speed pumps and regulating valves

Bai

Liu

et al. 2021

Indoor and Built Environment

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The district heating system that uses the hybrid operation of distributed variable speed pumps and regulating valves can effectively reduce the pressure level at the far-end of the heating network, while retaining the energy saving advantages of the distributed variable speed pump system and ensuring the safe operation of the heating network. In this study, pipe network optimization based on genetic algorithm was used to determine the pipe diameter required for the hybrid operation of distributed variable speed pumps and regulating valves. A mathematical model was established to evaluate the economic efficacy based on the annual equivalent cost. The zero-pressure difference point was evaluated to optimize the pipe diameter. A real pipe network was assessed to evaluate the efficacy of the method, and a sensitivity analysis of pressure constraints and economic factors was conducted. Our results show the system of hybrid operation of distributed variable speed pumps and regulating valves can reduce the annual equivalent cost by about 10.35% compared to the conventional central circulating pump system. In addition, the annual energy consumption due to heat loss and pump operation is only 0.36% higher than that of the conventional central circulating pump system.

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Optimal operation of novel hybrid district heating system driven by central and distributed variable speed pumps

Cited by 26 publications

References 16 publications

Distributed model predictive control for central heating of high-rise residential buildings

Distributed model predictive control for central heating of high-rise residential buildings

Energy and Economic Assessment of Energy Efficiency Options for Energy Districts: Case Studies in Italy and Egypt

Optimal diameter of district heating pipe network based on the hybrid operation of distributed variable speed pumps and regulating valves

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