scholarly journals Analysis of the use of adsorption processes in trigeneration systems

2013 ◽  
Vol 34 (4) ◽  
pp. 35-49 ◽  
Author(s):  
Andrzej Grzebielec ◽  
Artur Rusowicz
Keyword(s):  
Heat Source ◽  
District Heating ◽  
Coefficient Of Performance ◽  
Heating Systems ◽  
Research Results ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
District Heating Systems ◽  
Adsorption Processes

Abstract The trigeneration systems for production of cold use sorption refrigeration machines: absorption and adsorption types. Absorption systems are characterized namely by better cooling coefficient of performance, while the adsorptive systems are characterized by the ability to operate at lower temperatures. The driving heat source temperature can be as low as 60-70 °C. Such temperature of the driving heat source allows to use them in district heating systems. The article focuses on the presentation of the research results on the adsorption devices designed to work in trigeneration systems.

scholarly journals Optimal Hierarchical Decision-Making for Heat Source Selection of District Heating Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Fang Fang ◽  
Nan Wang
Keyword(s):  
Decision Making ◽  
Heat Source ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Heating Systems ◽  
Source Selection ◽  
District Heating Systems ◽  
Comprehensive Benefit ◽  
Selection Of

With the rapid development of China’s urbanization, the proportion between the heating consumption and the energy consumption of the whole society keeps rising in recent years. For a district heating system, the selection of the heat source makes significant impact on the energy efficiency and the pollutant emissions. By integrating the methods of the Analytic Hierarchy Process (AHP) and the Preference Ranking Organization Method for Enrichment Evaluation (PROMETHEE), a multiple-attribute decision-making scheme for the heat source selection of district heating systems is proposed in this paper. As a core part of this scheme, a comprehensive benefit index with hierarchical parallel structure is constructed. The economic benefit, environment benefit, and technical benefit can be reflected with a certain percentage in the comprehensive benefit index. To test the efficiency of the proposed scheme, a case study for a large-scale district heating system in Beijing is carried out, where five kinds of heat sources (water source heat pump, ground source heat pump, gas-fired boiler, coal-fired boiler, and oil-fired boiler) are taken into account. The analysis and instructions for the final sorting result are also demonstrated.

scholarly journals TECHNICAL AND ECONOMIC EFFICIENCY OF COMBINED DISTRICT HEATING WITH LOCAL HEAT SOURCE FOR DISTRICT HOT WATER

2020 ◽  
pp. 34-40
Author(s):  
Ye.Ye. Nikitin ◽  
O.V. Dutka
Keyword(s):  
Heat Source ◽  
Water Supply ◽  
District Heating ◽  
Local Heat ◽  
Hot Water ◽  
Supply Source ◽  
Heating Systems ◽  
Local Heat Source ◽  
District Heating Systems ◽  
Hot Water Supply

The scheme of combined district heating systems is used, in which centralized heating is used for heating and local heat source is used for hot water supply. A mathematical model has been developed that allows to perform a comparative analysis of the technical and economic characteristics of two scenarios of modernization of the heat supply system: replacement of boilers, heat networks and pumps while using the traditional hot water supply scheme, and replacement of these elements in combination with the installation of a local hot water supply source that provides the hot water supply. hot water by means of a local heat network whose length is substantially smaller than the existing one. Electric heaters and solar collectors with electric heating are proposed as local heat sources. The advantages of combined district heating schemes on the planning horizon of 10 years are shown. The analysis of the influence of various factors on the advantage of the combined scheme of district heating is performed. The developed model can be used for preparation of feasibility studies of projects of energy efficient modernization of district heating systems. Ref. 4, Fig. 7, Tab. 1.

scholarly journals Ultra-low-temperature district heating systems – a way to maximise the ecological and economical effect of an investment?

2018 ◽  
Vol 44 ◽  
pp. 00018 ◽  
Author(s):  
Bartłomiej Ciapała ◽  
Jakub Jurasz ◽  
Mirosław Janowski
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Electric Power ◽  
Economic Impacts ◽  
District Heating ◽  
Ecological Effects ◽  
Capacity Factor ◽  
Heating Systems ◽  
Ecological Aspects ◽  
District Heating Systems

One of the most challenging aspects of a new district heating (DH) design is its general performance, which will determine the ecological and economic impacts of the investment. Choosing the lowest applicable temperatures which are distributed via ultra-low-temperature district heating (ULTDH) systems may yield the desired results. The article elaborates the economic and ecological aspects of the application of ULTDH. The results of the analysis indicate that the capacity factor may be significantly improved, while the overall ecological effects of the investment are strongly dependent on the previously used heat source and the source of electric power.

EXPERIMENTAL STUDY ON A THREE-BED ADSORPTION CHILLER

2011 ◽  
Vol 19 (04) ◽  
pp. 285-290 ◽  
Author(s):  
M. Z. I. KHAN ◽  
S. SULTANA ◽  
B. B. SAHA ◽  
A. AKISAWA
Keyword(s):  
Heat Source ◽  
Recovery Process ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Inlet Temperature ◽  
Adsorption Chiller ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
Recovery Scheme ◽  
Mass Recovery

This article presents the experimental results of a three-bed advanced adsorption chiller using silica gel–water as the adsorbent–refrigerant pair. The three-bed adsorption chiller comprises three sorption elements (Hexs), one evaporator and one condenser. In the present study, the heat source temperature varies from 55°C to 80°C along with coolant inlet temperature at 30°C and the chilled water inlet temperature at 14°C. Mass recovery process occurs between Hex1 and Hex2 and no mass recovery with Hex3. The performances in terms of cooling capacity (CC) and coefficient of performance (COP) are compared with those of conventional three-bed without mass recovery scheme. Results show that three-bed with mass recovery scheme provides more CC values than those provided by the three-bed system without mass recovery scheme while it provides better COP values for 65–75°C heat source temperature.

CONCEPTUAL POSITIONS OF MODERNIZATION OF EXISTING INEFFICIENT DISTRICT HEATING SYSTEMS

2017 ◽  
pp. 11-21
Author(s):  
Ye.Ye. Nikitin
Keyword(s):  
Energy Efficient ◽  
Mutual Influence ◽  
District Heating ◽  
Current Status ◽  
Cognitive Approach ◽  
Heating Systems ◽  
Energy Management Systems ◽  
Current State ◽  
Self Sufficiency ◽  
District Heating Systems

The current situation in the sphere of district heating is analysed on the basis of use of the cognitive approach. The presence of closed chains of cause-effect relationships of negative factors and conflicts of target settings of the subjects in the field of district heating is shown. The conceptual model of energy efficient modernization of district heating systems is proposed. This model includes indicators of the current status of heat sources, networks and heat consumers, energetic and economic models, restrictions, procedure of forming and analysis of the mutual influence of the recommended projects. The quantitative data on indicators of the current state of district heating systems of the cities of Ukraine are presented. The interrelation between indicators of the current state and projects of energy efficient modernization of district heating systems is shown. Assessment of energy self-sufficiency of municipal district heating systems on condition of thermal modernization of buildings is carried out. The creation of energy management systems at the district heating enterprises is proposed. Bib. 6, Fig. 7, Tab. 5.

scholarly journals Technology Pathways and Economic Analysis for Transforming High Temperature to Low Temperature District Heating Systems

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3218
Author(s):  
Pedro Durán ◽  
Herena Torio ◽  
Patrik Schönfeldt ◽  
Peter Klement ◽  
Benedikt Hanke ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Renewable Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Economic Analysis ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Heating Systems ◽  
District Heating Systems

There are 1454 district heating systems in Germany. Most of them are fossil based and with high temperature levels, which is neither efficient nor sustainable and needs to be changed for reaching the 2050 climate goals. In this paper, we present a case study for transforming a high to low temperature district heating system which is more suitable for renewable energy supply. With the Carnot Toolbox, a dynamic model of a potential district heating system is simulated and then transformed to a low temperature supply. A sensitivity analysis is carried out to see the system performance in case space constrains restrict the transformation. Finally, an economic comparison is performed. Results show that it is technically possible to perform the transformation until a very low temperature system. The use of decentralized renewable sources, decentralized heat storage tanks and the placement of a heat pump on each building are the key points to achieve the transformation. Regarding the sensitivity analysis, the transformation is worth doing until the seasonal storage and solar collector field sizes are reduced to 60% and 80% of their values in the reference case, respectively. The economic analysis shows, however, that it is hard for highly efficient low temperature renewable based heat networks to compete with district heating systems based on a centralized fossile CHP solution. Thus, though the presented transformation is technically possible, there is a strong need to change existing economic schemes and policies for fostering a stronger promotion of renewable energy policies in the heat sector.

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