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  • 1
    Online Resource
    Online Resource
    EDP Sciences ; 2018
    In:  MATEC Web of Conferences Vol. 245 ( 2018), p. 06011-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 245 ( 2018), p. 06011-
    Abstract: Most of the urban housing stock in Latvia as well as in major part of EU cities is apartment multi-storey buildings, most of which have a connection to centralized hot tap water systems. Also, such buildings as dormitories, university campuses, sporting facilities, mostly are connected to the centralized hot tap water systems. The hot tap water systems can have different optional technical solutions, such as recirculation loop, bath towels warmers, etc. All these options affect calculation’s specifics of the systems. The main challenge for designers is to make correct estimation of hydraulic losses, definition of necessary water flow rate and to choose such technical equipment as circulation pumps, balancing valves and circulation water flow. The main parameters directly affecting the sizing of hot tap water system are the number of inhabitants, designed water consumption, consumption uncertainty coefficient, building’s specifics etc. This study is based on the hot water consumption analysis in building were online monitoring system was installed.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
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  • 2
    Online Resource
    Online Resource
    EDP Sciences ; 2018
    In:  MATEC Web of Conferences Vol. 245 ( 2018), p. 16002-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 245 ( 2018), p. 16002-
    Abstract: Rapid urbanization leads to the cities expansion in both dimensions: horizontal and vertical. Thus causing significant increase of energy consumption and reduction of environment quality. Nowadays European Initiative on Smart Cities development becomes a very popular across the globe. The aim of this initiative is to insure sustainable city development taking into consideration quality of life and reduction of carbon emissions. Residential sector is one of biggest energy consumers and carbon emission production in Latvia. Also, city transport is a crucial carbon emission producers. In scope of this study the city development potential is analyzed. The increase of energy efficient scale is taking into consideration.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
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  • 3
    In: MATEC Web of Conferences, EDP Sciences, Vol. 245 ( 2018), p. 06013-
    Abstract: The prices for energy resources, global trends for greenhouse gases emission limitation makes the application of higher efficient chillers with process air evaporative cooling more common. In order to determine the economical feasibility for choosing the particular type of cooling unit for the specific building, many factors should be taken into account, which are not always available. One of these factors is the European seasonal energy efficiency ratio (ESEER) defined by the Eurovent Certification Company. It overtakes the outdoor air temperatures from +20° to +35°C with different cooling loads, which is not completely suitable for the Baltic States. Within the research monitoring of cooling system and air parameters was performed during the cooling season. It was indicated that the distribution of the energy generated by the investigated object differs significantly from the distribution of influence factors according to ESEER test methodology. The calculation of the annual energy consumption for the particular historic building according to the recorded power distribution within the outdoor air temperature ranges was performed. Using the proposed method the results are much closer to the actual annual energy consumption of the cooling plant than the one performed using the seasonal efficiency with the base temperature of 18°C.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
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  • 4
    Online Resource
    Online Resource
    EDP Sciences ; 2018
    In:  MATEC Web of Conferences Vol. 245 ( 2018), p. 07004-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 245 ( 2018), p. 07004-
    Abstract: Most of the urban housing stock in Latvia as well as in major part of EU cities is apartment multi-storey buildings, most of which have a connection to centralized hot tap water systems. Also, such buildings as dormitories, university campuses, sporting facilities, mostly are connected to the centralized hot tap water systems. The hot tap water systems can have different optional technical solutions, such as recirculation loop, bath towels warmers, etc. All these options affect calculation’s specifics of the systems. The main challenge for designers is to make correct estimation of hydraulic losses, definition of necessary water flow rate and to choose such technical equipment as circulation pumps, balancing valves and circulation water flow. The main parameters directly affecting the sizing of hot tap water system are the number of inhabitants, designed water consumption, consumption uncertainty coefficient, building’s specifics etc. This study is based on the hot water consumption analysis in building were online monitoring system was installed.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
    Library Location Call Number Volume/Issue/Year Availability
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  • 5
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2021
    In:  Latvian Journal of Physics and Technical Sciences Vol. 58, No. 2 ( 2021-04-01), p. 32-44
    In: Latvian Journal of Physics and Technical Sciences, Walter de Gruyter GmbH, Vol. 58, No. 2 ( 2021-04-01), p. 32-44
    Abstract: One of the main challenges in the world as well as in Latvia is the reduction of the fossil fuel consumption. Electricity generation, which is still mainly produced by fossil fuel or nuclear power, is one of the largest shares. Nowadays end-users can efficiently control their electricity consumption by shifting electrical loads and taking into account fluctuating electricity price at Nord Pool. The smart metering systems have been expanding, but for the time being, end-users do not use this possibility efficiently. This study provides an analysis of Latvian electricity consumption specifics and evaluates a potential to shift electricity peak loads. The study includes households, industry and commercial/public sector. Based on the questionnaire distributed among end-users, the initial data on equipment and usage profile were collected. The most essential equipment was reviewed to estimate the potential for load shift. The obtained results show that that there is a positive effect of the load shift. In the household sector, the average electrical load shift can be 6 % (95 GWh/ year) during a period at a cheaper price; in the industry sector on average 37 % (36.58 GWh/ year) and in the commercial/public sector there is no potential due to its specifics (working hours, constant use of refrigerators, etc.).
    Type of Medium: Online Resource
    ISSN: 0868-8257
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2487461-9
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  • 6
    Online Resource
    Online Resource
    EDP Sciences ; 2018
    In:  MATEC Web of Conferences Vol. 251 ( 2018), p. 03004-
    In: MATEC Web of Conferences, EDP Sciences, Vol. 251 ( 2018), p. 03004-
    Abstract: Nowadays new and modern tools should be actively used in buildings energy retrofitting processes. Handmade measuring and 2D design process should be minimized as possible and by replaced by advanced computer technologies such as automated data proceedings, 3D scanning and automated production lines. All these measures will allow significant minimization failures in design, energy simulation and construction. Available computing capacities allows data proceeding in reasonable time and quality. 3D building model is an efficient tool to develop precise retrofitting project and to make correct energy consumption estimation3D building model allows precise dynamic energy simulation using such software as IDA-ICE, RISUKA, IES, EnergyPlus etc. This research provides detailed analysis of existing buildings whole 3Ddevelopment process from scanning to creation of model.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
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  • 7
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  IOP Conference Series: Earth and Environmental Science Vol. 290, No. 1 ( 2019-06-01), p. 012105-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 290, No. 1 ( 2019-06-01), p. 012105-
    Abstract: Buildings use about 40% of the national energy consumption, and approximately 25-30% of this energy is wasted due to inefficient windows. Installation of energy efficient glazing allows significant reduction of cooling load. While increase of hat consumption can be observed in heating period due to significant reduction of solar heat gains. On the basis of computer simulations there were found dependences between overall energy efficiency of the building and such parameters as its orientation, urbanization, and the types of glazing. Building energy modelling (BEM) allows to predict the energy consumption of the building, to find and correct the weak spots in terms of energy consumption and to find the most effective way to use energy saving technologies. The IDA-ICE, chosen as the BEM in the research, is a whole-year detailed and dynamic multi-zone simulation application for study of thermal indoor climate and the entire building energy consumption. The main advantage of the software package is a detailed report for each of the building zones and for the whole building, which includes calculation of heat flows and inflows, maintained temperatures, sources of heat losses and energy costs to maintain a comfort temperature. The variable data are the type of glazing (different window types chosen, with special emphasis on g-value of glass and coefficient of shading) and building’s orientation to the world sides. The research demonstrates the effectiveness of using particular glazing types depending on the building conditions. The developed recommendations allow to reduce energy consumption in existing buildings and to reduce construction costs of new office buildings at the design stage.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2434538-6
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  • 8
    In: MATEC Web of Conferences, EDP Sciences, Vol. 251 ( 2018), p. 01011-
    Abstract: This paper is devoted to analysis of insulation materials quality and characteristics, method for the determination of thermal conductivity coefficient and the influence of various factors on the thermal conductivity coefficient. The paper summarizes the estimated process consumption of thermal energy. The research is defined experimental hemp fiber-sheaves insulation plates manufactured in Latvia further specified actual parameter and quality water absorption; thickness changes; drying process; thermal conductivity coefficient; thermal conductivity coefficient depending from moisture. Research is made using experimental hemp fiber-sheaves insulation pattern manufactured in Latvia – plates in size 300 x 300 mm. In research totally are used three hemp fiber-sheaves pattern series with different substance and extrusion modes. Each series consist from four plate with different thickness. As result of research is determined hemp fiber-sheaves insulation pattern Water absorption, dynamics of Drying process, Thickness changes, Thermal conductivity coefficient and Thermal conductivity coefficient depending from moisture.
    Type of Medium: Online Resource
    ISSN: 2261-236X
    Language: English
    Publisher: EDP Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2673602-0
    Library Location Call Number Volume/Issue/Year Availability
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  • 9
    Online Resource
    Online Resource
    IOP Publishing ; 2015
    In:  IOP Conference Series: Materials Science and Engineering Vol. 96 ( 2015-11-02), p. 012031-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 96 ( 2015-11-02), p. 012031-
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2506501-4
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  • 10
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  IOP Conference Series: Earth and Environmental Science Vol. 290, No. 1 ( 2019-06-01), p. 012131-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 290, No. 1 ( 2019-06-01), p. 012131-
    Abstract: The aim of the study is to analysis renovation solutions for unclassified buildings. According to Latvian law definition, unclassified buildings are prisons, security forces, police and fire services buildings including barracks, warehouse etc. Such buildings has completely different heat gains and heat losses balance and usage profile in comparison to traditional public and apartment buildings. Unclassified buildings could have higher internal heat and moisture loads, more strict requirements to dress code (CLO level), human metabolic equivalent and limited possibility for staff adaptation to IAQ parameters. The one of important factors is safety of energy supply and operation of HVAC systems. Although the energy security is a top priority for unclassified buildings, it should not be a barrier for implementation of renewable energy sources and innovative energy efficient retrofitting solutions in unclassified buildings.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2434538-6
    Library Location Call Number Volume/Issue/Year Availability
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