Andra Blumberga

Andra Blumberga
Riga Technical University | RTU · Institute of Energy Systems and Environment

Dr.sc.ing.

About

157
Publications
32,042
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1,557
Citations
Citations since 2016
95 Research Items
1445 Citations
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2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250

Publications

Publications (157)
Article
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This study focuses on designing a massive open online course (MOOC) to enhance students learning about the energy transition process and its connection to climate change in theory and complex dynamic systems. The course ‘Energy transition and climate change’ covers one of the United Nations’ ‘Sustainable development goals’ and is one of twelve MOOC...
Article
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Even though the development of renewable energy technologies has been one of the most discussed and research-rich fields of science, and there are many practical and convincing technologies in the field of renewable energy, the path taken by society to shift from the use of non-renewable energy sources to the use of renewable ones has often been sl...
Article
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Energy communities are paving the way for new cooperation opportunities related to energy consumption and energy production. Individuals unite in energy communities to reduce the costs related to energy consumption. Although previous work has mainly focused on energy exchange inside the community. This work aims to investigate the Pareto-optimal so...
Article
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The paper investigates state policy to promote solar energy in Latvia’s and Ukraine’s households. Comparing different approaches to stimulating sectors’ development in both countries, the article evaluates the economic efficiency of solar power plants implementation based on the Levelized Cost of Electricity method and investment projects payback p...
Article
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The transport sector accounts for about one-third of the final energy consumption in Latvia, most of which are fossil fuels in road transport. Fossil fuel consumption increases emissions and demands an immediate change in mobility habits to achieve climate neutrality by 2050. This paper focuses on the in-depth analyses of passenger transport by mod...
Article
The energy transformation sector, including district heating (DH), is vital in reaching long-term emission reductions and thus climate neutrality set by the European Commission. Biomass for energy production continues to grow in countries with extensive forest resources, e.g. Latvia. However, growing global demand obligates increasing the added val...
Article
Major concern in utilising renewable energy sources, such as solar or wind, is their intermittent nature. Therefore, whether they can be reliable energy sources to provide uninterrupted energy demand when reaching a high share of renewable energy in the system depends on the whole energy supply network. Higher flexibility of RES-based systems can b...
Article
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Active building envelopes that act as energy converters—gathering on-site available renewable energy and converting it to thermal energy or electricity—is a promising technological design niche to reduce energy consumption in the building sector, cut greenhouse gas emissions, and thus tackle climate change challenges. This research adds scientific...
Article
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All European Union (EU) member states till 2020 had an obligatory target for energy efficiency. One of instruments for countries to achieve national energy efficiency goals is obligation for large companies (LC) and large electricity consumers (LEC) to implement certified energy management system or perform energy audit. In this study the Latvian c...
Article
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The energy transition from inefficient fossil-based to sustainable energy systems can face various lock-ins. There are no pathways that are free of stress. However, many routes are possible. A good understanding of the dynamic behavior of systems is crucial, and proper support tools are needed to assess the outcomes of every selected pathway. This...
Article
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Institutional capacity is enabling environment for interactions between individuals and organizations. Understanding the changes required regarding the institutional capacity is needed to remove barriers and stimulate transition to sustainable energy systems. The aim of this study was to identify those barriers to understand what type of changes of...
Article
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The aim of presented study was to identify the most promising new business models which could help to reach climate and energy targets. ‘Business model’ means new opportunities (e.g. business for profit or non-profit community collaboration models) enabled by various technologies in energy domains, i.e., heat and power supply and demand as well as...
Article
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Mycelium composites is a new class of renewable materials which can be used for heat insulation of buildings. Use of the composites would help to reduce both operational energy consumption and embodied energy of building insulation materials. In addition, use of the renewable composites could also reduce embodied greenhouse gas (GHG) emissions of t...
Article
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The European Union has set an ambitious goal to tackle climate change, and energy efficiency in the residential sector is among the measures required to close the gap between targeted and actual greenhouse gas emissions. While different policy tools have been applied, the diffusion rate of these measures remains low. A system dynamics simulation mo...
Article
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Buildings are linked to a significant untapped energy saving potential, accounting for 40 % of European Union’s (EU) final energy and 36 % of CO2 emissions. Energy efficient building envelopes plays the key role to achieve decarbonization of the EU’s building stock by 2050. Active building envelopes are emerging and novel trend offering the paradig...
Article
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Evidence collected by researchers over several decades suggests that the successful implementation of the Energy Efficiency Obligation Scheme (EEOS) may deliver significant, cost-effective energy savings over many years. However, before starting EEOS in Latvia, predictions by energy efficiency policy researchers envisaged that it is at high risk of...
Article
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The industry sector in many countries has a significant role in reaching national long-term emission reductions, energy efficiency and renewable energy targets. New technologies, wide implementation of energy efficiency measures and smart energy management are needed for the industry to ensure local and global competitiveness and reduce emissions....
Article
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The paper analyzes strategies for restricting Latvia’s dependence on fossil fuel imports in line with an increasing challenge to follow the leading EU Member States in greening the energy sector. Availability of local biomass resources ensures the necessary framework for building an arranged, environmentally and climate-friendly economy. Primary at...
Article
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Energy service contracting (EPC) is one of the private sector instruments to improve end use energy efficiency. The dominant part of EPC projects is implemented in the industrial, governmental and municipal sectors while the residential sector has been less attractive to energy service companies (ESCO). This paper describes the first EPC project im...
Article
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Energy efficiency policy has been one of the European Union top priorities for decades and will continue to play a vital role in the next 10 years with the introduction of The Clean energy for all Europeans. Likewise, in Latvia energy efficiency has been given high priority; however, the energy efficiency targets for industry has lacked ambitions....
Article
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Bioeconomy in Europe has become one of the leading courses for sustainable and resource-efficient development. Main aspects of bioeconomy: development of new technologies and processes, development of markets and competitiveness for bioeconomy can be implemented through higher education and transformative knowledge for building a sustainable bioeco...
Article
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The paper describes the development of a computer-based inverse model for climate adaptive building shell which is in the cold climatic conditions of Latvia to determine changes in energy consumption. Types, principles of operation and classification of climate adaptive building shells (CABS) were reviewed and CABS most fitting to Latvia’s climate...
Article
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The study presented in this paper is a continued research of preceding tests of small-scale passive solar wall module to explore 1) the behaviour of solar wall module in various setups for an extended 48-hour period of time, and 2) the performance of solar module with and without fine metal wires as heat exchange enhancers. Eight different solar wa...
Technical Report
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This report is one of five deliverables related to WP6 ‘Development and evaluation of guidelines and web-based preliminary assessment tool ‘. The prime objective of WP6 is to develop and to assess written and web-based guidelines and a web tool (including a feasibility study of possible input and output data) for renovation of historic buildings wi...
Article
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National energy sector management differs from country to country. Therefore, it is important to develop country-specific energy models to analyse the energy demand, structure and potential policy instruments. The paper presents a pathway for adaption and improvement of the standard TIMES model structure to the specific country requirements. The an...
Article
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The energy efficiency – indoor air quality dilemma is well known and the main drawback to operate the mechanical ventilation is electricity costs as concluded from previous studies. Educational buildings are one of the places where future taxpayers spend a lot of time. This paper aims to study an alternative solution on how to reduce energy efficie...
Article
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Latvia’s industrial energy efficiency policy imposes the implementation of mandatory energy audits and energy management systems in large industrial enterprises and large industrial electricity consumers to improve industrial competitiveness, to move towards a carbon-neutral economy and to increase the security of supply. Companies affected by this...
Article
Optimizing energy consumption in the cities might present a significant impact on decarbonization strategies approaching carbon neutral future in 2050. Positive Energy Block initiative is targeted particularly to densely build environments promoting shared on-site renewable energy production and storage, using smart grids, internet and communicatio...
Article
Increased energy efficiency of the building stock is one of the main tools to reduce climate change. Improved airtightness of the building envelope has a side effect - the need for higher ventilation rates which, in turn, lead to a higher energy bill and reduced indoor air quality. This creates an energy efficiency - indoor air quality dilemma. Thi...
Article
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The European Union has set the target for energy sector decarbonization. Variable renewable energy technologies are necessary to reach this target, but a high level of variable renewable energy raises the flexibility issues. In this research paper, the flexibility issue is addressed by analysing possibility of sector coupling via power-to-heat and...
Article
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The EU 2030 climate package calls for raising energy efficiency, increasing usage of RES and decreasing the carbon footprint. There are stringent requirements for new buildings, but the energy efficiency potential in the existing building stock is still not fully explored. The latest trend in urban energy efficiency is the Positive Energy Block (PE...
Article
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The study presented in this paper is a continuation of small-scale passive solar wall module testing to evaluate: 1) the impact of phase change material embedded in building envelope on indoor air temperature in comparison to reference wall insulated with mineral wool 2) the impact of Fresnel lens on heat transfer processes in designed module compa...
Article
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In-situ measurements of a case study building located in Riga old town near the river Daugava has been carried out in this work. Performed measurements are moisture level of historic masonry, and interstitial monitoring of temperature and relative humidity between the layers of internal insulation and external wall. Obtained results are compared wi...
Article
Today buildings become part of Smart Energy Systems. 4th generation district heating network requires buildings with low energy consumption. In Europe, historic buildings account for around 30% from total buildings stock with high energy consumption which has to be reduced. Many of them have heritage value and external insulation of walls is not po...
Article
The aim of this review is to discuss how quantitative modelling of energy scenarios for sustainable energy transition pathways can be made more realistic by taking into account insights from the socio-technical and related literatures. The proposition is that an enriched modelling approach would focus not just on technology development and deployme...
Article
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There is rapid growth in energy efficiency in the building sector oriented to zero energy or plus energy building concepts. Additionally building designs need to solve a complex task combining energy and environmental requirements, as well as social and economic performance requirements in one architectural object. Therefore when constructing new g...
Article
The goal of this study is to assess latent and sensible energy accumulation in building envelope using PCM as heat accumulator and Fresnel lens as solar concentrator. Small-scale passive solar wall module with PCM and Fresnel lens was built and tested in laboratory. Results of the test module were compared to results obtained in the reference box w...
Article
By using system dynamic modelling, this research evaluates the role of Latvian forest biotechonomic – more efficient exploitation of natural resources and higher added-value in processing of biological goods – industry in the macroeconomic development model of the national economy of Latvia by year 2047. In addition, research primarily focusses on...
Article
Building energy efficiency is important for reaching both global climate goals and European Union energy efficiency goals. Although building energy efficiency is a long-time government priority, renovation projects are developing at a rather slow rate and may be an obstacle for a transition to a low carbon energy system. The development of Energy S...
Article
The energy efficiency – indoor air quality dilemma is a common predicament in many buildings undergoing energy efficiency improvements. The main goal of this research is to study the impact of this dilemma on national final energy consumption and greenhouse gas emission reduction. A simulation using a system dynamics model was carried out. The stoc...
Article
Article shows how system dynamics modelling (SDM) approach could be used in modelling the energy transition towards low carbon energy system. SDM can be used to combine the techno-economic and socio-technical analysis. The study considers flexibility issues related to integration of renewable energy sources. Simplified model structure is made to il...
Conference Paper
Full-text available
The aim of the paper is to discuss how quantitative modelling of energy scenarios for sustainable energy transition pathways can be made more realistic by taking into account insights from the socio-technical and related literatures. The proposition is that an enriched modelling approach would focus not just on technology development and deployment...
Article
Buildings consume 40% of the total primary energy use worldwide and it could increase if no energy efficiency measures are taken. Diffusion of nearly zero energy buildings is among building energy efficiency measures in many countries. Synergy of energy reduction in buildings and efficiency increase in district heating and cooling networks is part...
Article
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Being an important contributor to the final energy consumption, historic buildings built before 1945 have high specific heating energy consumption compared to current energy standards and norms. However, they often cannot be insulated from the outside due to their heritage and culture value. Internal insulation is an alternative. However internal i...
Article
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The paper uses system dynamics modelling to analyse the development of bioenergy; economic system that uses biotechnology instead of conventional technology. The research is directed towards the use of biomass in the production of higher added value bioproducts in the forestry and agricultural sectors. This paper emphasizes and evaluates the energy...
Article
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According to plans of the European Union (EU), Latvia needs to reduce its greenhouse gas emissions in the non-ETS sector by 6% until 2030 in comparison to 2005. Many policy instruments are evaluated to support GHG emissions reduction. A system dynamics modelling approach was used to analyze the impact of supporting mechanisms on CO2 emissions from...
Article
Worldwide the lighting sector demands around 1/5 of total electricity used. While the diffusion of new lighting technologies occurs quickly and prices for these technologies drop, at the same time around 1/3 of households in developed European countries continue to choose incandescent light bulbs. This phenomena shows a large potential for saving e...
Article
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As the response to the financial downturn and arising social problems, eco-innovation flagship was elaborated as one of the main building blocks for sustainable, smart and inclusive growth. Nevertheless, the experts are increasing pointing out, that we are missing one important link, while focusing mainly on technical innovations and natural enviro...
Article
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In this paper we evaluate Latvian Energy policy for energy intensive manufacturing companies and its impact on energy efficiency improvements using system dynamic approach. Since mid-2015, energy policy developments in Latvia are targeted to reduce energy costs for energy-intensive companies while imposing an obligation to implement an energy manag...
Article
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With a rapidly expanding global economic growth, issues of sustainability and potential impact on environment become more pressing. While it is clear that future growth should focus on more efficient exploitation of natural resources and higher added-value in processing of biological goods (referred to as biotechonomy), there is an avenue for futur...
Article
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To achieve energy efficiency targets set for building sector in EU, innovative thermal envelope materials should be implemented. Currently available materials have static thermodynamic properties. In the era of intelligent materials and gadgets responsive flexibilities can be applied to building materials as well. Paper illustrates proposal for cli...