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In order to decrease the energy consumption of large-scale district heating systems with cogeneration, a district heating system is presented in this paper based on absorption heat exchange in the cogeneration system named Co-ah cycle, which means that the cogeneration system is based on absorption heat exchange. In substations of the heating system, the temperature of return water of primary heat network is reduced to about 25°C through the absorption heat-exchange units. In the thermal station of the cogeneration plant, return water is heated orderly by the exhaust steam in the condenser, the absorption heat pumps, and the peak load heater. Compared with traditional heating systems, this system runs with a greater circuit temperature drop so that the delivery capacity of the heat network increases dramatically. Moreover, by recovering the exhausted heat from the condensers, the capacity of the district heating system and the energy efficiency of the combined heat and power system (CHP system) are highly developed. Therefore, high energy and economic efficiency can be obtained.
2Dynamic response of gravity-driven flow in multi-section absorption heat pump
Dynamic response of gravity-driven flow in multi-section absorption heat pump
41Research and Application of Flue Gas Waste Heat Recovery in Co-generation Based on Absorption Heat-exchange
Research and Application of Flue Gas Waste Heat Recovery in Co-generation Based on Absorption Heat-exchange
65Fuzzy comprehensive evaluation of district heating systems
Fuzzy comprehensive evaluation of district heating systems
9A novel district heating system based on absorption heat exchange and water-heat combined supply
A novel district heating system based on absorption heat exchange and water-heat combined supply
13Comparative Analysis Between District Heating and Geothermal Heat Pump System
Comparative Analysis Between District Heating and Geothermal Heat Pump System
29Techno-economic model for district heating systems
Techno-economic model for district heating systems
72Effects of the operation regulation modes of district heating system on an integrated heat and power dispatch system for wind power integration
Effects of the operation regulation modes of district heating system on an integrated heat and power dispatch system for wind power integration
Read moreComputer aided expansion planning of combined electric power and district heating systems — A mixed integer programming model
A Mixed-Integer-Programming-Model is presented within this paper for long-term expansion and operation planning of combined electric power and heat systems. The mathematical formulation of the monetary objective and the power and heat demand restraints is explained at first. The restraints for the long-term operation of a typical extraction-condensing power plant are shown afterwards. The application of the planning-model to a practical power and heat system is illustrated by some diagrams.
Read more63Biomass-fired CHP and heat storage system simulations in existing district heating systems
Biomass-fired CHP and heat storage system simulations in existing district heating systems
98A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps
A new waste heat district heating system with combined heat and power (CHP) based on ejector heat exchangers and absorption heat pumps
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17Design and Analysis of District Heating Systems Utilizing Excess Heat in Japan
District heating systems (DHSs) which utilize excess heat play an important role in energy infrastructure in many European countries. In contrast to Europe, the DHS is not common and excess heat is not reused effectively in Japan. Almost all the DHSs in Japan were designed as first-generation district heating (1GDH) systems or 2GDH systems. No 4GDH systems have been introduced in Japan. The present study designs a 4GDH system utilizing excess heat from a wide area of Northern Japan and evaluates its feasibility. First, available heat amounts from two excess heat resources were calculated: waste incineration plants and thermal power plants. Second, heat demand from both residential and commercial sectors was estimated using a 1 km mesh, and a heat load curve was created for each mesh based on load curve data. Third, the DHS was designed with excess heat plants as a supply-side heat resource, and spatial information of the demand side made use of the geographical information system (GIS). Further analysis was conducted on selected DHSs in three cities in order to evaluate those systems’ feasibility based on energy efficiency, CO2 emissions, and economic aspects. The result shows that 70.5 PJ of heat can be supplied by DHS in Northern Japan, replacing imported fossil fuels such as petroleum and LPG with regional excess heat. The designed DHS could supply heat with equivalent costs compared to European countries.
Read more400Flexibility of a combined heat and power system with thermal energy storage for district heating
Flexibility of a combined heat and power system with thermal energy storage for district heating
17Metamorphoses of cogeneration-based district heating in Romania: A case study
Metamorphoses of cogeneration-based district heating in Romania: A case study
7Identifying untraced faults associated with high return temperatures from heating systems in buildings connected to district heating networks
The district heating (DH) system is in its transition towards the 4th generation district heating (4GDH), and the high DH return temperatures need to be addressed during the process. In the existing building heating systems, many faults, malfunctions, or sub-optimal operations can lead to high DH return temperatures. However, the field of fault detection and diagnostics (FDD) within heating systems is notably under-researched in contrast to their counterparts in ventilation and air conditioning in building HVAC systems. This divergence can be attributed to several factors, including limited digital integration, a scarcity of data, and the non-obvious nature of faults in heating systems. In this study, we utilized heat cost allocators (HCA) and energy meters to investigate the features and potential impacts of four untraced faults that can lead to high district heating (DH) return temperatures in both space heating and domestic hot water systems in large buildings. We identified component-level faults, including heat exchanger overflow, space heating temperature controller failures, and excessive operating temperatures due to bypass, as well as system-level issues such as non-uniform heat distribution in buildings and its impacts. This exploration provides new, critical insights for advancing FDD research in HVAC and DH systems.
Read more52Machine-learning-based multi-step heat demand forecasting in a district heating system
Machine-learning-based multi-step heat demand forecasting in a district heating system
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