scholarly journals LIFE CYCLE MULTI-CRITERIA ANALYSIS OF ALTERNATIVE ENERGY SUPPLY SYSTEMS FOR A RESIDENTIAL BUILDING / ALTERNATYVIŲJŲ DAUGIABUČIO NAMO APRŪPINIMO ENERGIJA SISTEMŲ GYVAVIMO CIKLO DAUGIAKRITERĖ ANALIZĖ

2013 ◽  
Vol 5 (4) ◽  
pp. 423-428 ◽  
Author(s):  
Artur Rogoža
Keyword(s):  
Life Cycle ◽  
Energy Supply ◽  
Alternative Energy ◽  
District Heating ◽  
Residential Building ◽  
Heat Pumps ◽  
Base Case ◽  
Alternative Systems ◽  
Multi Criteria Analysis ◽  
Supply Systems

The article analyses energy supply alternatives for a partially renovated residential building. In addition to the existing district heating (base case) alternative systems, gas boilers, heat pumps (air-water and ground-water), solar collectors, solar cells, and combinations of these systems have been examined. Actual heat consumption of the building and electricity demand determined by the statistical method are used for simulating the systems. The process of simulation is performed using EnergyPro software. In order to select an optimal energy supply option, the life cycle analysis of all systems has been carried out throughout a life span of the building, and the estimated results of energy, environmental and economic evaluation have been converted into non-dimensional variables (3E) using multi–criteria analysis. Article in Lithuanian. Santrauka Nagrinėjamos iš dalies renovuoto daugiabučio gyvenamojo pastato aprūpinimo energija alternatyvos. Be esamo centralizuotojo šilumos tiekimo (bazinis variantas), tiriama alternatyviosios sistemos: dujiniai katilai, šilumos siurbliai (oras– vanduo ir gruntas–vanduo), saulės kolektoriai, saulės elementai ir šių sistemų deriniai. Modeliuojant sistemas, naudojami faktiniai pastato šilumos suvartojimo ir statistiniu būdu nustatyti elektros poreikių duomenys. Sistemų modeliavimas atliekamas EnergyPro programa. Siekiant nustatyti optimalų aprūpinimo energija variantą, analizuojamas visų sistemų gyvavimo ciklas per visą pastato gyvavimo trukmę, o gauti energinio, ekologinio ir ekonominio vertinimų rezultatai daugiakriterės analizės būdu perskaičiuojami į nedimensinius rodiklius (3E).

scholarly journals MULTI-CRITERIA ANALYSIS OF ALTERNATIVE ENERGY SUPPLY SOLUTIONS TO PUBLIC NEARLY ZERO ENERGY BUILDINGS / BEVEIK NULINIO ENERGIJOS BALANSO VISUOMENINIŲ PASTATŲ APRŪPINIMO ENERGIJA SPRENDIMAI, DAUGIAKRITERĖ ANALIZĖ

2013 ◽  
Vol 5 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Giedrius Šiupšinskas ◽  
Solveiga Adomėnaitė
Keyword(s):  
Energy Supply ◽  
Energy Demand ◽  
Energy Production ◽  
Alternative Energy ◽  
Production Systems ◽  
Heat Pumps ◽  
Zero Energy ◽  
Multi Criteria Analysis ◽  
Transient System ◽  
Zero Energy Buildings

The article analyzes energy supply alternatives for modernised public nearly zero energy buildings. The paper examines alternative energy production systems such as heat pumps (air-water and ground-water), solar collectors, adsorption cooling, biomass boiler, solar photovoltaic, wind turbines and combinations of these systems. The simulation of the analysed building energy demand for different energy production alternatives has been performed using TRNSYS modelling software. In order to determine an optimal energy supply variant, the estimated results of energy, environmental, and economic evaluation have been converted into non-dimensional variables (3E) using multi-criteria analysis. Article in Lithuanian. Santrauka Siekiant beveik nulinio energijos balanso modernizuotame viešosios paskirties pastate, nagrinėjamos aprūpinimo energija alternatyvos. Tiriamos šios alternatyvios aprūpinimo energija sistemos: šilumos siurbliai (gruntas–vanduo ir oras– vanduo), saulės kolektoriai, adsorbcinė vėsinimo mašina, biokuro katilas, saulės elementai, vėjo jėgainė – ir šių sistemų deriniai. Skirtingų aprūpinimo energija variantų energijos poreikiai modeliuojami TRNSYS (The Transient System Simulation Program) modeliavimo programa. Siekiant nustatyti optimalų aprūpinimo energija variantą, gauti energinio, ekologinio ir ekonominio vertinimų rezultatai daugiakriterės analizės būdu perskaičiuojami į nedimensinius rodiklius (3E).

scholarly journals The Role of the Latvian District Heating System in the Development of Sustainable Energy Supply

2011 ◽  
Vol 7 (-1) ◽  
pp. 27-31 ◽  
Author(s):  
Gatis Bazbauers ◽  
Ginta Cimdina
Keyword(s):  
Wind Power ◽  
Energy Supply ◽  
Power Plants ◽  
District Heating ◽  
Heating System ◽  
Heat Pumps ◽  
Energy Sources ◽  
District Heating System ◽  
Wind Power Plants

The Role of the Latvian District Heating System in the Development of Sustainable Energy Supply The aim of the study is to determine whether and to what extent it is possible to use excess electricity produced by wind power plants during low demand periods for district heat production by heat pumps. Energy system analysis on an hourly basis is conducted at various capacities of wind power plants. The results show that it is possible to increase the share of renewable energy sources, decrease the use of primary energy sources and CO2 emissions per unit of the produced energy, i.e. heat and electricity, by using the surplus electricity produced by wind power in the heat pumps combined with the heat storage.

scholarly journals Optimization of operation of energy supply systems with co-generation and absorption refrigeration

2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 409-422 ◽  
Author(s):  
Mirko Stojiljkovic ◽  
Bratislav Blagojevic ◽  
Goran Vuckovic ◽  
Marko Ignjatovic ◽  
Dejan Mitrovic
Keyword(s):  
Energy Supply ◽  
Electric Utility ◽  
Heat Pumps ◽  
Point Of View ◽  
Mixed Integer ◽  
System Control ◽  
Absorption Refrigeration ◽  
Simulation And Optimization ◽  
Supply Systems ◽  
Energy Supply Systems

Co-generation systems, together with absorption refrigeration and thermal storage, can result in substantial benefits from the economic, energy and environmental point of view. Optimization of operation of such systems is important as a component of the entire optimization process in pre-construction phases, but also for short-term energy production planning and system control. This paper proposes an approach for operational optimization of energy supply systems with small or medium scale co-generation, additional boilers and heat pumps, absorption and compression refrigeration, thermal energy storage and interconnection to the electric utility grid. In this case, the objective is to minimize annual costs related to the plant operation. The optimization problem is defined as mixed integer nonlinear and solved combining modern stochastic techniques: genetic algorithms and simulated annealing with linear programming using the object oriented ?ESO-MS? software solution for simulation and optimization of energy supply systems, developed as a part of this research. This approach is applied to optimize a hypothetical plant that might be used to supply a real residential settlement in Nis, Serbia. Results are compared to the ones obtained after transforming the problem to mixed 0-1 linear and applying the branch and bound method.

scholarly journals The Analysis of Variants of Water Supply Systems in Multi-Family Residential Building

2015 ◽  
Vol 21 (4) ◽  
pp. 623-635 ◽  
Author(s):  
Daniel Słyś ◽  
Agnieszka Stec
Keyword(s):  
Life Cycle ◽  
Water Supply ◽  
Life Cycle Cost ◽  
Rainwater Harvesting ◽  
Residential Building ◽  
Water Supply Systems ◽  
Municipal Water ◽  
The World ◽  
Whole Life Cycle ◽  
Supply Systems

Abstract Climate change, improper use of water resources, surface waters pollution as well as increase of water requirements are the results of growing population of people in the world. It causes water deficiency in majority of countries in the world, including Poland. Due to the water pollution advanced technologies for its treatment are in demand, what leads to increase of water price. In this connection, there are more often taken actions to reduce water consumption by using rainwater to flush toilets, wash cars, do laundry or water green areas. This publication presents results of Life Cycle Cost analysis of two variants of water supply systems designed for multi-family residential building situated in Rzeszow. In line with LCC methodology the calculations were made throughout the whole life-cycle of the building considering initial investment outlays intended for construction of water supply system as well as operation and maintenance costs. In the first of analyzed variants it was assumed that the system would be fed by municipal water supply network. In the second variant rainwater harvesting system for domestic use was additionally applied. Rainwater stored in the tank would be used in sanitary installation to flush toilets, what leads to lowering the costs of municipal water purchase, reducing fees for rainwater discharge to sewage system and consequently is beneficial for financial standing of the examined building.

scholarly journals Use of vertical geothermal heat exchanger with nanofluid for heat supply systems

2021 ◽  
Vol 288 ◽  
pp. 01089
Author(s):  
Alexei Sednin ◽  
Aliaksandr Mukhin ◽  
Boris Balakin
Keyword(s):  
Heat Exchanger ◽  
District Heating ◽  
Heat Pumps ◽  
Working Fluid ◽  
Geothermal Heat ◽  
Heating Systems ◽  
District Heating Systems ◽  
Geothermal Heat Exchanger ◽  
Double Pipe ◽  
Supply Systems

Future district heating systems need to be more flexible and move towards a carbon-neutral generation. Compression heat pumps are foreseen to be promising future tools for district heating systems in EU countries. The paper presents the simulation data or a vertical double-pipe geothermal heat exchanger with ethylene glycol-Al2O3 as a working fluid. To simulate the operation of the heat exchanger, the STAR-CCM + CFD application was used. It has been determined the optimal volume particle concentrations of nanofluid and enhance of heat exchanger performance.

scholarly journals Environmental aspects of energy supply of buildings in Poland

2018 ◽  
Vol 49 ◽  
pp. 00097 ◽  
Author(s):  
Robert Sekret
Keyword(s):  
Energy Source ◽  
Renewable Energy ◽  
Environmental Impact ◽  
Energy Supply ◽  
Heat Supply ◽  
Building Energy ◽  
Heat Pumps ◽  
Heat Distribution ◽  
Building Heat ◽  
Supply Systems

The article presents the assessment of the environmental impact of 9 variants of building heat supply for heating purposes. The building energy standards and the main primary energy carriers being in use in Poland were taken as input data. The subject of analysis was a single-family house characterized by a utility energy demand of 47 kWh/(m2 year). An environmental impact analysis was made using the specification for LCA in damage categories encompassing human health, ecosystem quality and natural resources depletion. From the obtained results it has been found that coal-based technologies in Poland's building energy supply systems are capable of reducing the noxious environmental impact. An example of such a system is the effective heat distribution network with a coal-based cogeneration energy source. From the point of view of radical low emission reduction, an interesting solution is the effective heat distribution network with a gas-based cogeneration energy source. Nevertheless, forecasts about the development of renewable energy source installations in Poland indicate that a significant role in building heat supply systems will be played by solar systems and geothermal systems using heat pumps. Achieving the environmental acceptance of heat pumps in Poland's conditions requires a decisive intensification of efforts to increase the share of renewable energy sources in electric energy generation processes in the central electric power system and in local and individual systems, as well as the continuation of the processes of thermal insulation of already existing buildings.

Risk based life cycle assessment conceptual framework for energy supply systems in large buildings

2015 ◽  
Vol 107 ◽  
pp. 291-309 ◽  
Author(s):  
Nasser Ayoub ◽  
Farayi Musharavati ◽  
Shaligram Pokharel ◽  
Hossam A. Gabbar
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Conceptual Framework ◽  
Energy Supply ◽  
Supply Systems ◽  
Energy Supply Systems

scholarly journals Economic Optimization of the Energy Supply for a Logistics Center Considering Variable-Rate Energy Tariffs and Integration of Photovoltaics

2019 ◽  
Vol 9 (21) ◽  
pp. 4711 ◽  
Author(s):  
Alex Ximenes Naves ◽  
Victor Tulus ◽  
Elaine Garrido Vazquez ◽  
Laureano Jiménez Esteller ◽  
Assed Naked Haddad ◽  
...  
Keyword(s):  
Life Cycle ◽  
Energy Supply ◽  
Economic Optimization ◽  
Pv System ◽  
Logistics Center ◽  
Life Cycle Perspective ◽  
Electrical Demand ◽  
System Configurations ◽  
Supply Systems ◽  
Energy Surplus

The energy supplied by photovoltaic (PV) panels connected to the grid creates more flexibility for energy management; however, oversizing the PV system may result in an energy surplus, an essential factor to be considered during energy efficiency optimization. The economic analysis of energy supply systems for buildings and industry should include a detailed feasibility analysis and a life cycle perspective. Simulations were performed to quantify the potential savings when the excess of PV energy (surplus) is supposed to be exported to the grid by considering the net metering and net billing approaches. Our objective was to evaluate the electrical demand of a logistics center with pre-design modeling and simulation, and determine the adequate system configurations by considering the life cycle costing (LCC). We established a baseline and three alternative economic scenarios for optimization. Combining the use of TRNSYS 180 Simulation Studio and its optimization library component, GenOp (Generic Optimization Program), we simulated different options of grid energy contracts considering the variable tariffs and the integration with PVs. Based on the LCC, a single-objective optimization (SOO) process was performed. This approach allowed us to envisage possible configurations, reducing up to a quarter of annual grid energy consumption that represents savings of around 21% for the LCC in a timeframe of 20 years, reaching up to 39% when the export of the PV surplus energy is considered. The payback period of investments is below six years for the optimal scenarios.

scholarly journals Sustainable cooling alternatives for buildings

2011 ◽  
Vol 22 (4) ◽  
pp. 48-66 ◽  
Author(s):  
Jaco Vorster ◽  
Robert Dobson
Keyword(s):  
Alternative Energy ◽  
Cooling System ◽  
Base Case ◽  
Cooling Load ◽  
Air Conditioner ◽  
Active Mass ◽  
Spray System ◽  
Alternative Systems ◽  
The One ◽  
Air Conditioning Systems

Four sustainable alternative-energy cooling system options are investigated to quantify the actual energy that may be saved when employed in conjunction with conventional air conditioning systems. The four systems considered are active mass cooling, night flushing, roof-spraying and a roof-pond. A one-room building configuration is assumed of which the hourly cooling load and temperature is modelled for both a base case and different combinations of the four sustainable cooling alternative systems. Active mass cooling, night flushing and the roof-spray system proved to be viable options in which the cooling load of an air conditioner may be reduced to maintain a constant room temperature. The roof-spray system showed the most effective results in limiting heat gains to the one-room building and keeping peak room temperatures low.

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