PubAg

Main content area

You searched for: Subject "heating systems" Remove constraint Subject: "heating systems"
Start Over

Search

1,019  Search Results

« Previous | 1 - 20 of 1,019 |
Number of results to display per page

Search Results

1. Experimental study on double pipe PCM floor heating system under different operation strategies

Author:
Lu, Shilei; Xu, Bowen; Tang, Xiaolei
Source:
Renewable energy 2020 v.145 pp. 1280-1291
ISSN:
0960-1481
Subject:
heating systems,   etc   ; clean energy; climate; energy; heat; phase transition; renewable energy sources; supply balance; temperature; China;     Show all 10 Subjects
Abstract:
... Phase change material (PCM) can be integrated into floor heating system to store excess heat, releasing it when needed, thus effectively reducing the mismatch between energy supply and demand. In this study, a double pipe PCM floor heating system with three independent heating modules was proposed for clean energy heating in rural China. A 26-day experimental study was conducted to study the opera ...
DOI:
10.1016/j.renene.2019.06.086

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

Author:
Gong, Enwen; Wang, Na; You, Shijun; Wang, Yaran; Zhang, Huan; Wei, Shen
Source:
Energy conversion and management 2019 v.196 pp. 211-226
ISSN:
0196-8904
Subject:
heating systems,   etc   ; energy conservation; heat; pumps; risk;     Show all 5 Subjects
Abstract:
... The district heating system with distributed variable speed pumps can provide substantial energy savings, compared with the district heating system with conventional central circulating pump. However, for large-scale district heating systems, using distributed pumps at all substations leads to high pressures of the network terminals, which will increase the risk of pipe bursting and failure of hea ...
DOI:
10.1016/j.enconman.2019.06.004

3. Network flexibility study of urban centralized heating system: Concept, modeling and evaluation

Author:
Zhong, Wei; Chen, Jiaying; Zhou, Yi; Li, Zhongbo; Lin, Xiaojie
Source:
Energy 2019 v.177 pp. 334-346
ISSN:
0360-5442
Subject:
heating systems,   etc   ; energy; heat; models; pumps; topology;     Show all 6 Subjects
Abstract:
... The core of network transport capability is its flexibility, which represents the capability of the urban centralized heating system (UCHS) of managing the balance between heating demand, energy storage and multiple heating sources (including renewable-energy-based sources). This study carries out the flexibility analysis of UCHS by proposing an index of heating network flexibility (HNF) and formu ...
DOI:
10.1016/j.energy.2019.04.081

4. Thermal load prediction in district heating systems

Author:
Guelpa, Elisa; Marincioni, Ludovica; Capone, Martina; Deputato, Stefania; Verda, Vittorio
Source:
Energy 2019 v.176 pp. 693-703
ISSN:
0360-5442
Subject:
heating systems,   etc   ; buildings; heat; models; prediction;     Show all 5 Subjects
Abstract:
... Optimal operation of district heating (DH) systems usually relies on the forecast of thermal demand profiles of the connected buildings. Depending on the purpose of the analysis, thermal request can be required at various levels, from building level to thermal plant level. In the case of demand response for example, thermal request is necessary at a building level to evaluate its applicability and ...
DOI:
10.1016/j.energy.2019.04.021

5. Natural-draft flow and heat transfer in a plancha-type biomass cookstove

Author:
Núñez, José; Moctezuma-Sánchez, Miguel F.; Fisher, Elizabeth M.; Berrueta, Víctor M.; Masera, Omar R.; Beltrán, Alberto
Source:
Renewable energy 2020 v.146 pp. 727-736
ISSN:
0960-1481
Subject:
heating systems,   etc   ; air; air flow; biomass; combustion; cooking stoves; heat transfer; mass flow; models; renewable energy sources; temperature; wood;     Show all 12 Subjects
Abstract:
... The fluid flow, heat transfer, and gas-phase chemical reactions for a natural-draft plancha-type biomass cookstove are studied at steady state with a commercial CFD code, ANSYS Fluent™. Different firepowers (in the range of real operating conditions), modeled as different flow rates of wood volatiles entering the 3D computational domain, were investigated. Firepower was found to have minimal effec ...
DOI:
10.1016/j.renene.2019.07.007

6. A methodological approach to the determination of optimal parameters of district heating systems with several heat sources

Author:
Stennikov, Valery A.; Barakhtenko, Evgeny A.; Sokolov, Dmitry V.
Source:
Energy 2019 v.185 pp. 350-360
ISSN:
0360-5442
Subject:
heating systems,   etc   ; dynamic programming; energy; equipment; heat; mathematical models;     Show all 6 Subjects
Abstract:
... The determination of optimal parameters is of great importance to ensure the operability of a district heating system. Solving this problem entails providing the necessary network transmission capacity by determining pipe diameters, sites and parameters of pumping stations. The Melentiev Energy Systems Institute of Siberian Branch of the Russian Academy of Sciences has proposed methods to solve pr ...
DOI:
10.1016/j.energy.2019.07.048

7. Developing a combinatorial optimisation approach to design district heating networks based on deep geothermal energy

Author:
Weinand, Jann Michael; Kleinebrahm, Max; McKenna, Russell; Mainzer, Kai; Fichtner, Wolf
Source:
Applied energy 2019 v.251 pp. 113367
ISSN:
0306-2619
Subject:
heating systems,   etc   ; buildings; energy; geothermal energy; heat; models;     Show all 6 Subjects
Abstract:
... Plants increasingly exploit high geothermal energy potentials in German district heating networks. Municipal planners need instruments to design the district heating network for geothermal heat. This paper presents a combinatorial mixed-integer linear optimisation model and a three-stage heuristic to determine the minimum-cost district heating systems in municipalities. The central innovations are ...
DOI:
10.1016/j.apenergy.2019.113367

8. Demand side management in district heating networks: A real application

Author:
Guelpa, Elisa; Marincioni, Ludovica; Deputato, Stefania; Capone, Martina; Amelio, Stefano; Pochettino, Enrico; Verda, Vittorio
Source:
Energy 2019 v.182 pp. 433-442
ISSN:
0360-5442
Subject:
heating systems,   etc   ; boilers; buildings; heat; pipelines; renewable energy sources;     Show all 6 Subjects
Abstract:
... Demand side management is one of the strategies for an optimal management of DH networks. This consists in rescheduling the time the heating systems are switched on and off, or modifying their settings. In this way, the thermal request profile results as changed, with the following effects: 1) additional buildings can be connected to the network without installing new pipelines; 2) a better exploi ...
DOI:
10.1016/j.energy.2019.05.131

9. Differential game model with discretized solution for distributing heat produced by solar heating systems

Author:
Kicsiny, R.
Source:
Renewable energy 2019 v.140 pp. 330-340
ISSN:
0960-1481
Subject:
heating systems,   etc   ; energy; heat; models; renewable energy sources; temperature;     Show all 6 Subjects
Abstract:
... It is indispensable for the sustainable energy supply of our society to increase the proportion of the renewables in the energy production. For this purpose, it is important to distribute the renewables, like solar heat, with maximal efficiency among the consumers. The theoretically established, effective tool for the solution of this problem is the mathematical (and especially, the game theoretic ...
DOI:
10.1016/j.renene.2019.03.068

10. Faults in district heating customer installations and ways to approach them: Experiences from Swedish utilities

Author:
Månsson, Sara; Johansson Kallioniemi, Per-Olof; Thern, Marcus; Van Oevelen, Tijs; Sernhed, Kerstin
Source:
Energy 2019 v.180 pp. 163-174
ISSN:
0360-5442
Subject:
heating systems,   etc   ; consumers (people); customer service; heat; surveys; temperature;     Show all 6 Subjects
Abstract:
... The district heating (DH) customer installations in current DH systems contain a variety of different faults that cause the return temperatures of the systems to increase. This is a major problem, since the focus in the DH sector is to decrease the system temperatures in order to utilize more low-temperature heat. Therefore, this study has focused on how utilities are currently working to keep the ...
DOI:
10.1016/j.energy.2019.04.220

11. Evaluation of an ammonia-water absorption long-distance cooling/heating system for enhanced geothermal resources

Author:
Han, Bing-Chuan; Cheng, Wen-Long; Nian, Yong-Le; Yang, Lei; Zhao, Rui
Source:
Energy conversion and management 2019 v.192 pp. 346-358
ISSN:
0196-8904
Subject:
heating systems,   etc   ; absorption; cooling; geothermal energy; heat transfer; models; wells;     Show all 7 Subjects
Abstract:
... In order to solve the problem of low utilization efficiency of Enhanced Geothermal System (EGS) and overlong distance between geothermal wells and energy demand sites. Based on the principle of Solution Transportation Absorption system (STA), this paper presented a long-distance cooling/heating system for dual-well EGS. Firstly, a comprehensive heat transfer model for the dual-well EGS system was ...
DOI:
10.1016/j.enconman.2019.04.050

12. Costs and benefits of preparing existing Danish buildings for low-temperature district heating

Author:
Østergaard, Dorte Skaarup; Svendsen, Svend
Source:
Energy 2019 v.176 pp. 718-727
ISSN:
0360-5442
Subject:
heating systems,   etc   ; buildings; consumers (people); economic feasibility; energy; heat; temperature;     Show all 7 Subjects
Abstract:
... This paper aims to provide an overview of the costs and benefits of preparing existing space heating systems for low-temperature district heating. Necessary heating system improvements were assessed based on previous work carried out on the topic. This included evaluating the necessity of installing larger heating elements and improving heating system control. The costs of the identified heating s ...
DOI:
10.1016/j.energy.2019.03.186

13. Energetic and exergetic performance evaluation of a solar cooling and heating system assisted with thermal storage

Author:
Mendecka, Barbara; Cozzolino, Raffaello; Leveni, Martina; Bella, Gino
Source:
Energy 2019 v.176 pp. 816-829
ISSN:
0360-5442
Subject:
heating systems,   etc   ; adsorption; cooling; exergy; heat; solar energy; thermal energy;     Show all 7 Subjects
Abstract:
... In this paper, an integrated system aiming for heating and cooling production using solar energy is investigated. The system consisting of a solar driven adsorption chiller and radiation heating coupled with thermal energy storage is analysed thermodynamically, and its overall performance is assessed through energy and exergy efficiencies. The main goal is to compare performances of the system equ ...
DOI:
10.1016/j.energy.2019.04.024

14. An integrated model predictive control approach for optimal HVAC and energy storage operation in large-scale buildings

Author:
Bianchini, Gianni; Casini, Marco; Pepe, Daniele; Vicino, Antonio; Zanvettor, Giovanni Gino
Source:
Applied energy 2019 v.240 pp. 327-340
ISSN:
0306-2619
Subject:
heating systems,   etc   ; air conditioning; buildings; energy; uncertainty; ventilation systems;     Show all 6 Subjects
Abstract:
... This paper deals with the problem of cost-optimal operation of smart buildings that integrate a centralized HVAC system, photovoltaic generation and both thermal and electrical storage devices. Building participation in a Demand-Response program is also considered. The proposed solution is based on a specialized Model Predictive Control strategy to optimally manage the HVAC system and the storage ...
DOI:
10.1016/j.apenergy.2019.01.187

15. On using the minimum energy dissipation to estimate the steady-state of a flow network and discussion about the resulting power-law:application to tree-shaped networks in HVAC systems

Author:
Soto-Francés, Víctor-Manuel; Pinazo-Ojer, José-Manuel; Sarabia-Escrivá, Emilio-José; Martínez-Beltrán, Pedro-Juan
Source:
Energy 2019 v.172 pp. 181-195
ISSN:
0360-5442
Subject:
heating systems,   etc   ; air conditioning; energy; entropy; pipes; ventilation systems;     Show all 6 Subjects
Abstract:
... The paper analyses how to compute the steady-state flow distribution through a given network by using the Minimum Entropy Production (MinEP) principle. For isothermal and incompressible flows, this is equivalent to the minimal dissipation of energy. The conditions that make this method equivalent to the conventional one are studied. There must exist a power-law for the energy dissipation (entropy ...
DOI:
10.1016/j.energy.2019.01.060

16. Modelling stratified thermal energy storage tanks using an advanced flowrate distribution of the received flow

Author:
Saloux, E.; Candanedo, J.A.
Source:
Applied energy 2019
ISSN:
0306-2619
Subject:
heating systems,   etc   ; energy resources; models; storage technology; tanks; thermal energy;     Show all 6 Subjects
Abstract:
... Energy storage plays a central role in managing energy resources and demand. Among the numerous energy storage technologies, stratified storage tanks are a promising option, but their operation requires to be finely tuned in order to optimize their utilization. Accurate models are required to properly design and control such systems. In this paper, an advanced flowrate distribution of the flow ent ...
DOI:
10.1016/j.apenergy.2019.02.075

17. Future district heating systems and technologies: On the role of smart energy systems and 4th generation district heating

Author:
Lund, Henrik; Duic, Neven; Østergaard, Poul Alberg; Mathiesen, Brian Vad
Source:
Energy 2018 v.165 pp. 614-619
ISSN:
0360-5442
Subject:
heating systems,   etc   ; energy; heat; renewable energy sources;     Show all 4 Subjects
Abstract:
... This paper provides a perspective on the development of future district heating systems and technologies and their role in future smart energy systems. The reviewed papers elaborate on or otherwise contribute to the theoretical scientific understanding of how we can design and implement a suitable and least-cost transformation into a sustainable energy future. Focus is on the important role of the ...
DOI:
10.1016/j.energy.2018.09.115

18. Experience from a practical test of low-temperature district heating for space heating in five Danish single-family houses from the 1930s

Author:
Østergaard, Dorte Skaarup; Svendsen, Svend
Source:
Energy 2018 v.159 pp. 569-578
ISSN:
0360-5442
Subject:
heating systems,   etc   ; heat; mass flow; temperature; winter;     Show all 5 Subjects
Abstract:
... The efficiency of district heating systems is greatly affected by network supply and return temperatures. However, the opportunities to lower the temperatures and thereby increase network efficiency are restricted by customer installations. Very little is known about the customer installations, because heating system operation is only rarely monitored in detail. In this study, we therefore investi ...
DOI:
10.1016/j.energy.2018.06.142

19. Turn It Up and Open the Window: On the Rebound Effects in Residential Heating

Author:
Hediger, Cécile; Farsi, Mehdi; Weber, Sylvain
Source:
Ecological economics 2018 v.149 pp. 21-39
ISSN:
0921-8009
Subject:
heating systems,   etc   ; econometrics; energy; heat; households;     Show all 5 Subjects
Abstract:
... This paper investigates how households respond to efficiency improvements of their heating system. The analysis is based on the stated preference approach with an innovative choice experiment. The design includes questions to quantify both the direct and indirect rebounds. A series of easy discrete possible changes have been suggested to prime the respondents for deciding on potential actions impa ...
DOI:
10.1016/j.ecolecon.2018.02.006

20. Potential for district heating to lower peak electricity demand in a medium-size municipality in Sweden

Author:
Swing Gustafsson, Moa; Myhren, Jonn Are; Dotzauer, Erik
Source:
Journal of cleaner production 2018 v.186 pp. 1-9
ISSN:
0959-6526
Subject:
heating systems,   etc   ; buildings; electricity; energy; heat; Sweden;     Show all 6 Subjects
Abstract:
... Sweden faces several challenges with more intermittent power in the energy system. One challenge is to have enough power available in periods with low intermittent production. A solution could be to reduce peak demand and at the same time produce more electricity during these hours. One way of doing this is to convert electricity-based heating in buildings to district heating based on combined hea ...
DOI:
10.1016/j.jclepro.2018.03.038