scholarly journals Sustainable Residential Energy Supply: A Literature Review-Based Morphological Analysis

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 432 ◽  
Author(s):  
Stefan Arens ◽  
Sunke Schlüters ◽  
Benedikt Hanke ◽  
Karsten von Maydell ◽  
Carsten Agert
Keyword(s):  
Energy Supply ◽  
Energy Demand ◽  
Morphological Analysis ◽  
Energy System ◽  
Heat Pumps ◽  
Electricity Sector ◽  
Residential Energy ◽  
Electricity Grid ◽  
Vehicle To Grid ◽  
Mode Shift

The decarbonization of the energy system will bring substantial changes, from supranational regions to residential sites. This review investigates sustainable energy supply, applying a multi-sectoral approach from a residential site perspective, especially with focus on identifying crucial, plausible factors and their influence on the operation of the system. The traditionally separated mobility, heat, and electricity sectors are examined in more detail with regard to their decarbonization approaches. For every sector, available technologies, demand, and future perspectives are described. Furthermore, the benefits of cross-sectoral integration and technology coupling are examined, besides challenges to the electricity grid due to upcoming technologies, such as electric vehicles and heat pumps. Measures such as transport mode shift and improving building insulation can reduce the demand in their respective sector, although their impact remains uncertain. Moreover, flexibility measures such as Power to X or vehicle to grid couple the electricity sector to other sectors such as the mobility and heat sectors. Based on these findings, a morphological analysis is conducted. A morphological box is presented to summarize the major characteristics of the future residential energy system and investigate mutually incompatible pairs of factors. Lastly, the scenario space is further analyzed in terms of annual energy demand for a district.

The use of temporal factors for improved CO2 emissions accounting in buildings

2018 ◽  
Vol 39 (2) ◽  
pp. 196-210 ◽  
Author(s):  
Barny Evans ◽  
Sabbir Sidat
Keyword(s):  
Air Quality ◽  
Energy Demand ◽  
Energy System ◽  
Net Energy ◽  
Electricity Grid ◽  
Electrical Grid ◽  
Significant Difference ◽  
Emissions Factor ◽  
Single Number ◽  
The Impact

This paper is an investigation into the issues around how we calculate CO2 emissions in the built environment. At present, in Building Regulations and GHG Protocol calculations used for buildings and corporate CO2 emissions calculations, it is standard to use a single number for the CO2 emission factor of each source. This paper considers how energy demand, particularly electricity at different times of the day, season and even year can differ in terms of its CO2 emissions. This paper models three different building types (retail, office and home) using standard software to estimate a profile of energy demand. It then considers how CO2 emissions calculations differ between using the single standard emissions factor and using an hourly emissions factor based on real electrical grid generation over a year. The paper also examines the impact of considering lifetime emissions factors rather than one-year factors using UK government projections. The results show that there is a significant difference to the analysis of benefit in terms of CO2 emissions from different measures – both intra- and inter-year – due to the varying CO2 emissions intensity, even when they deliver the same amount of net energy saving. Other factors not considered in this paper, such as impact on peak generation and air quality, are likely to be important when considering whole-system impacts. In line with this, it is recommended that moves are made to incorporate intra- and inter-year emissions factor changes in methodologies for calculating CO2 emissions. (This is particularly important as demand side response and energy storage, although generally accepted as important in the decarbonisation of the energy system at present will show as an increase in CO2 emissions when using a single number.) Further work quantifying the impact on air quality and peak generation capacity should also be considered. Practical application: This paper aims to help practitioners to understand the performance gap between how systems need to be designed in order to meet regulations compared to how buildings perform in reality – both today and in the future. In particular, it considers the use of ‘real-time’ carbon factors in order to attain long-term CO2 reductions. This methodology enables decision makers to understand the impacts of different energy reduction technologies, considering each of their unique characteristics and usage profiles. If implemented, the result is a simple-to-use dataset which can be embedded into the software packages already available onto the market which mirrors the complexity of the electricity grid that is under-represented through the use of a static carbon figure.

scholarly journals Evaluating the Potential Contribution of District Heating to the Flexibility of the Future Italian Power System

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 584
Author(s):  
Chiara Magni ◽  
Sylvain Quoilin ◽  
Alessia Arteconi
Keyword(s):  
Power Systems ◽  
Power System ◽  
Large Scale ◽  
District Heating ◽  
Energy System ◽  
Heat Pumps ◽  
Electricity Sector ◽  
Potential Contribution ◽  
The Future ◽  
Promising Solution

Flexibility is crucial to enable the penetration of high shares of renewables in the power system while ensuring the security and affordability of the electricity dispatch. In this regard, heat–electricity sector coupling technologies are considered a promising solution for the integration of flexible devices such as thermal storage units and heat pumps. The deployment of these devices would also enable the decarbonization of the heating sector, responsible for around half of the energy consumption in the EU, of which 75% is currently supplied by fossil fuels. This paper investigates in which measure the diffusion of district heating (DH) coupled with thermal energy storage (TES) units can contribute to the overall system flexibility and to the provision of operating reserves for energy systems with high renewable penetration. The deployment of two different DH supply technologies, namely combined heat and power units (CHP) and large-scale heat pumps (P2HT), is modeled and compared in terms of performance. The case study analyzed is the future Italian energy system, which is simulated through the unit commitment and optimal dispatch model Dispa-SET. Results show that DH coupled with heat pumps and CHP units could enable both costs and emissions related to the heat–electricity sector to be reduced by up to 50%. DH systems also proved to be a promising solution to grant the flexibility and resilience of power systems with high shares of renewables by significantly reducing the curtailment of renewables and cost-optimally providing up to 15% of the total upward reserve requirements.

Energy/Exergy Conversion Factors of Low Enthalpy Geothermal Plants

2021 ◽  
Author(s):  
Henning Francke
Keyword(s):  
Performance Indicator ◽  
Energy System ◽  
Heat Pumps ◽  
Electricity Sector ◽  
Not Given ◽  
Geothermal Heat ◽  
Operation Costs ◽  
Integrated Energy System ◽  
Useful Heat ◽  
Selection Of

Abstract A geothermal heat plant is a not only a source of heat, but, in general, also a sink for relevant amounts of electricity, consumed mainly by the pump(s). This electricity demand is usually not given much attention although being decisive for operation costs, but also offering chances for demand side management as a variable consumer. From the perspective of an integrated energy system, geothermal installations basically move energy from the electricity sector into the heat sector, similar to compression heat pumps. The main heat pump performance indicator is the ratio between invested energy and useful heat, the COP. This paper transfers the COP concept to geothermal sites, by defining and determining the quantity for a selection of mostly German geothermal sites.

scholarly journals The possibility of achievement of the nZEB state of a refurbished detached house powered solely by renewable energy sources in Southern Poland

2018 ◽  
Vol 70 ◽  
pp. 01001
Author(s):  
Jacek Biskupski
Keyword(s):  
Renewable Energy ◽  
Energy Demand ◽  
Renewable Energy Sources ◽  
Primary Energy ◽  
Heat Pumps ◽  
Space Heating ◽  
Zero Energy ◽  
Electricity Grid ◽  
Primary Energy Demand ◽  
Pv Generator

This paper gives a thorough description of the two different scenarios of retrofit of an existing detached country house (with high primary energy demand) to a net zero energy building (nZEB) or near zero energy (nearZEB) by using energy form on-site RES. Using a designed piece of modelling software author pointed out two possible solutions. First one, based on a bio boiler and small on-site PV generator (on-grid) and the other based on large PV generator and three heat pumps. A 24 months test was performed in order to find out the output of both scenarios. In first period, the bio boiler delivered energy for space heating and DHW, while energy from PV was used to cover all electricity needs of the household during the 12 months testing period. In the later, the energy received from 10 kWp PV of was partly used to cover the current needs of the entire household (switchable on/off-grid system), and surplus was stored in the national electricity grid and regained later in the winter for the space heating (by a GSHP) and ventilation (ASHP) and DHW (dedicated ASHP). In both cases the system proofed the possibility to achieve the nZEB (nearZEB in first scenario) state of the household, as all (in the first near all) energy needs were covered by renewable energy produced on-site.

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).

Russian Energy Sector: Inertia Strategy or Efficiency Strategy?

2007 ◽  
pp. 104-122 ◽  
Author(s):  
I. Bashmakov
Keyword(s):  
Economic Growth ◽  
Energy Supply ◽  
Energy Demand ◽  
Supply And Demand ◽  
Energy System ◽  
Or Efficiency ◽  
Russian Economy ◽  
Oriented Energy ◽  
The Given ◽  
Scenario Approach

The paper presents a vision of Russian energy future before 2020. The scenario approach is required to identify potential energy supply and demand future trajectories for Russia facing uncertainties of both global energy system evolution and domestic demographic and economic development in 2007-2020. It allows for assessing energy demand by sectors under different investment, technological and energy pricing policies favoring the least cost balancing of energy supply options and energy efficiency improvements to sustain dynamic economic growth. The given approach provides grounds for evaluation of different energy policies effectiveness. Three scenarios - "Inertia Strategy", "Energy Centrism", and "Efficiency Strategy - Four I" - integral-innovative-intellectual-individual oriented energy systems - are considered in the paper. It shows that ignorance of the last scenario escalates either energy shortages in the country or Russian economy overloading with energy supply investments both preventing from sustaining rates of economic growth which have recently been demonstrated by Russia.

Optimal Design and Control of Wind-Diesel Hybrid Energy Systems for Remote Arctic Mines

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Alberto Romero ◽  
Monica Carvalho ◽  
Dean L. Millar
Keyword(s):  
Energy Supply ◽  
Energy Demand ◽  
Capital Investment ◽  
Integrated Design ◽  
Energy Resource ◽  
Energy System ◽  
Energy Costs ◽  
Mining Operations ◽  
Spinning Reserve ◽  
And Control

Mining operations are located in increasingly remote areas in order to search for relatively high-grade mineral deposits, despite the challenges that arise. These challenges are fundamentally logistic and directly impact the profitability of the remote operation. One of the main challenges is energy supply, since locations that lack a power grid, fuel pipelines, or adequate—if existing—road access have substantially increased energy-related operating costs. Today, a remote mine's energy costs add up to 40% of total operating expenses; this is in contrast with grid-connected, accessible mines, where the energy costs seldom reach 20% of the total. In searching for more cost-effective energy supply options, the present work uses the optimal mine site energy supply (OMSES) concept to optimize the design and operation schedule of a remote underground mine's energy supply system (ESS). Energy demand, weather, and economic data were collected and processed, emulating a remote mine in the Northwest Territories, Canada. The optimal energy system minimized the total cost of the energy supply, which included not only the operation cost but also the annuitized capital investment in equipment. Subsequently, the optimal system's design for the considered demands and environmental factors was subject to simulation and control optimization. Wind power was included in the formulation. Issues such as the necessary spinning reserve and the penetration curtailment, among others, were analyzed, both in the design and the control problems. The present work identified potential improvements for the integrated design (ID) and control of a remote mine's energy system, in particular when including a renewable energy resource with a considerable level of variability, i.e., wind. The optimal solution included the installation of two wind turbines (WTs), achieving 3% diesel savings with a 20% increase of investment compared with the conventional design. The model was validated with a real project—the Diavik Diamond Mine ESS, which included a wind farm with four turbines. A model predictive control (MPC) approach was chosen to optimize scheduling in a simulation with variable conditions of wind speed and ambient temperature; this proved to be a convenient method to assess the robustness of optimal designs. Results also confirmed the limitations of design optimization when uncertainties related to wind energy were ignored.

scholarly journals Integration of Reversible Heat Pumps in Trigeneration Systems for Low-Temperature Renewable District Heating and Cooling Microgrids

2019 ◽  
Vol 9 (15) ◽  
pp. 3194 ◽  
Author(s):  
Urbanucci ◽  
Testi ◽  
Bruno
Keyword(s):  
Low Temperature ◽  
Carbon Dioxide Emissions ◽  
Energy Demand ◽  
Water Distribution ◽  
District Heating ◽  
Energy System ◽  
Heat Pumps ◽  
Energy Technologies ◽  
Heating And Cooling ◽  
Viable Solution

District heating and cooling networks based on trigeneration systems and renewable energy technologies are widely acknowledged as an energy efficient and environmentally benign solution. These energy systems generally include back-up units, namely fossil-fuel boilers and electric chillers, to enhance system flexibility and cover peak energy demand. On the other hand, 4th generation district heating networks are characterized by low-temperature water distribution to improve energy and exergy efficiencies. Moreover, reversible heat pumps are a versatile technology, capable of providing both heating and cooling, alternately. In this paper, the integration of reversible heat pumps as single back-up units in hybrid renewable trigeneration systems serving low-energy micro-district heating and cooling networks is investigated. A detailed modeling of the system is provided, considering part-load and ambient condition effects on the performance of the units. Size and annual operation of the proposed system are optimized in a case study, namely a large office building located in Pisa (Italy), by means of a genetic algorithm-based procedure. A comparison with the conventional trigeneration system is performed in terms of economic and environmental perspectives. Results show that the integration of reversible heat pumps is an economically viable solution capable of reducing by 7% the equivalent annual cost, increasing the installed power of renewables up to 23%, and lowering by 11% carbon dioxide emissions, compared to the energy system with conventional back-up units.

A Study of Smart Grid Systems

2021 ◽  
pp. 127-138
Author(s):  
Uliya Mitra ◽  
Vikas Dubey
Keyword(s):  
Smart Grid ◽  
Energy Supply ◽  
Energy Demand ◽  
Electric Energy ◽  
Energy System ◽  
Electrical Network ◽  
Grid Systems ◽  
Electric System ◽  
The World ◽  
Increasing Demand

In the 21st century, energy supply has been one of the challenging issues that the world is facing. This is due to growing populations which results in more homes, businesses, and industries and has resulted in a large number of new appliances that increased the energy demand to a new level. The electric system we are using today is a one-way energy flow. Smart grid has emerged as the solution of continuously increasing demand. It is the future of electric energy system and also the power grid for upcoming generations. SG system works on the dual technique, that is, it counts electricity flow and the information which could deliver and distribute the energy universally by automating the existing electrical network.

scholarly journals 100% Renewable Energy for Austria’s Industry: Scenarios, Energy Carriers and Infrastructure Requirements

2021 ◽  
Vol 11 (4) ◽  
pp. 1819
Author(s):  
Roman Geyer ◽  
Sophie Knöttner ◽  
Christian Diendorfer ◽  
Gerwin Drexler-Schmid ◽  
Verena Alton
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Energy Supply ◽  
Energy Demand ◽  
Energy System ◽  
Industrial Sector ◽  
Energy Carriers ◽  
Final Energy ◽  
Industrial Energy ◽  
Final Energy Consumption

The need for decarbonization raises several questions. How can renewable energy supply for the industrial sector be realized in the long term? Furthermore, how must the existing energy system be transformed to achieve the ambitious climate targets in place? In Austria, the share of renewable energy supplying industrial energy demand currently accounts for only 45% of final energy consumption. This clearly shows that a conversion of industrial energy systems is necessary. Different ambitious perspectives for a renewable energy supply for the Austrian industrial sector are calculated for three defined scenarios (base, efficiency, transition) in this paper. In addition, corresponding requirements for the energy infrastructures are discussed. The scenario results show a range of industrial final energy consumption from 78 TWh (efficiency) to 105 TWh (transition) through decarbonizing the industrial energy supply (cf. 87 TWh in 2019). Decarbonization requires an increasing shift towards electrical energy, especially in the transition scenario, whereas in the base and efficiency scenarios, biogenic fuels play an important role. Comprehensive decarbonization and the associated substitution of energy carriers in industry pose significant challenges for the existing energy infrastructure, its expansion, and optimization.

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