Gatis Žogla

Riga Technical University | RTU ·  Institute of Environmental Protection and Heating Systems

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...

A system dynamics modeling approach was used to analyze the impact of economical mechanisms on CO2 emissions from the Latvian district heating system that is not covered by the European Union (EU) Emission Trading System (non-ETS). Three policy instruments were included in the system dynamic model: carbon tax, subsidies for solar technologies, and...

Historic buildings built before 1945 make up a significant part of the building stock in the European Union. They also contribute to the greenhouse gas emissions due to high energy consumption. However, policy makers and building owners are facing “building energy efficiency-heritage value” dilemma when, on the one hand it is important to preserve...

Latvija un tajā skaitā Latgale ir bagāta ar ēkām, kuras celtas pirms Otrā pasaules kara un ir būtiska pilsētu un lauku teritoriju ainavas sastāvdaļa. Taču, salīdzinot ar mūsdienu energoefektivitātes prasībām, to enerģijas patēriņš un ietekme uz klimata pārmaiņām ir liela. Viens no tehniskajiem risinājumiem, kuru var izmantot ēkās, kuru siltināšana...

Energy retrofit of buildings in Europe is one of the main priorities in order to reach its sustainability goals. Every building retrofit project faces with a decision making process attributed to optimal alternative selection depending on the initial retrofit goals. For each building there may be numerous alternatives which have to be objectively e...

A high energy efficiency and sustainability standards defined by modern society and legislation requires solutions in the form of complex integrated systems. The scope of this work is to provide a review on technologies and methods for the heating of ventilation air as a key aspect for high energy and environmental performance of buildings located...

Historic buildings are considered to be one of the precious gems of Europe, which defines its character and rich cultural heritage. Therefore historical buildings with historical significance must be valued and preserved. The climate conditions to which buildings are subjected may deteriorate their structural elements therefore reducing their life...

Different approaches have been used to calculate and set up the benchmarks for evaluation of energy performance in industry. The main disadvantage of these approaches is that the benchmark is variable in time, thus very likely not showing the real performance of energy efficiency and its changes. This study presents a new approach for calculation o...

Energy Performance Contracts (EPCs) are very seldom used in the residential sector, especially for extensive renovations of multi-family or apartment buildings. Only up to 10% of energy service companies’ activities are targeted in the sector. A cost benefit analysis was carried out to compare different renovation business models. It was proved tha...

Šis mācību izdevums ir izveidots, par pamatu ņemot oriģinālus laboratorijas un praktiskos darbus. Laboratorijas darbu krājuma mērķauditorija ir ne tikai vides inženierzinātņu studenti, bet arī pārējo inženierzinātņu un vides zinātņu studenti, kā arī Rīgas Tehniskās universitātes un pārējo Latvijas universitāšu mācību spēki, kuri strādā ilgtspējīgas...

Energy efficiency of buildings has become a significant issue in Latvia and across Europe. More than a half (by heated area) of Latvian housing stock consists of multi-family buildings. 63% of buildings are panel houses built during the Soviet era when no one thought about energy efficiency issue and energy resources was very cheap. Today, energy p...

Sustainable residential energy consumption involves a complex, socially embedded and socially constructed market. A system dynamics approach has been used to explore the short, medium and long term impact of different national consumer-oriented energy efficiency policies in the residential building sector. In this paper the system dynamics model ha...

Energy efficiency in historical heritage buildings is viewed as a taboo because these buildings usually are protected under law and no energy efficiency measures that would change the appearance of the building are allowed. In this paper we look at the potential of increasing energy efficiency level in historical buildings. Measurements to determin...

Latvia has the unprecedented opportunity to be the first country in the world to sell assigned amount units under Article 17 of the Kyoto Protocol – International Emissions Trading. Negotiations are ongoing with a number of buyers for pilot transactions with a cumulative volume of 8–10 million assigned amount units (AAUs) out of 40 million AAUs ear...

The paper focuses on natural ventilation systems in new buildings. There is particular interest in heat energy consumption and indoor air quality with different ventilation possibilities. Indoor air quality measurements during different ventilation solutions were conducted in a new apartment building. The results of this paper show that, by applyin...

The existing calculation method for heat gains and building energy balance, which has been approved in Latvian legislation, uses approximately 70 equations and formulas to calculate heat gains. By carrying out a study on apartment building heat gains it was concluded that these heat gains for different types of buildings are located in relatively n...

Paper was presented in the 29th International Conference of the System Dynamics Society July 25 – 29, 2011 --- Washington, DC: To ensure implementation of requirements of EU Directive 2006/32/EC on energy end-use efficiency and energy services in Latvia First National Energy Efficiency Action Plan (EEAP) 2008 – 2010 is approved where the goal is es...