Increasing self electricity consumption by using double water heating tanks for residential net zero-energy buildings

Annuk, Andres; Jogi, Erkki; Hovi, Mart; Märss, Maido; Uiga, Jaanus; Hõimoja, Hardi; Peets, T.; Kalder, Janar; Jasinskas, Algirdas; Allik, Alo

doi:10.1109/icrera.2017.8191249

Cited by 14 publications

(8 citation statements)

References 26 publications

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“…Although, the daily average energy used for hot water production is 5.05 ±1.80 kWh [22].. The maximum energy capacity calculated in this case per day of a commercially available 80 l boiler is 5.4 kWh [16].…”

Section: Methodsmentioning

confidence: 84%

“…The wind generator used for the modelling and simulation of the parameters is the following: it has a rated power of 10 kW, located in a coastal area (N 59.087694, E 23.591719) and it is produced by TUGE Ltd [16]. The 10 photovoltaic panels have a total rated power of 2.5 kW, located in an urban area (N 58.388458, E 26.694000) and the producer is DelSolar [16]. The measured period covers a time beginning with the 1 st of December 2015 and ending with the 30 th of November 2016.…”

Section: Methodsmentioning

confidence: 99%

“…The annual energy yield of the wind generator and PV system are scaled to be 70 %/30 % [20] in favour of the wind energy [18; 21]. The model for evaluation of the self-consumption is tested with capacity factors (CF) of wind generators ranging from 0.051 to 0.28, at the same time the capacity factor of solar panels CF = 0.11 [16] is constant. We analyse the dependence of rated power according to CF (Fig, 2.…”

Section: Methodsmentioning

confidence: 99%

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Evaluating electricity self-consumption in different renewable energy supply conditions

Annuk

Jogi

Kalder

et al. 2018

Engineering for Rural Development

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The aim of this article is to detect energy storage problems in dwelling buildings with PV panels and wind generator based electrical energy supply. The focus of the research is to maximise the yield of energy consumed on-site utilising two water heater boilers with equal volumes as energy storage devices and consumption in household devices as white goods, lighting, etc. Energy output from fluctuating sources like PV panels and wind generators is divided by a desired horizontal shaving level on the production curve, separating peaks and stable production. Energy peaks are fed to a pre-heating water boiler and the main part of energy below the shaving level is used in the main boiler and consumption of household devices, maintaining the equalised balance of produced and utilised energy. The observational period is one year with 5-minute averaged data points. Wind generator energy output is calculated according to three different wind conditions, evaluating self-consumption, while retaining PV panel yield on the same level. The produced solar and wind energy ratio is 30 %/70 %. The compared wind conditions result in a capacity factor of 0.055 in the worst case and up to 0.273 in better conditions, while the cover factor increased from 0.6 up to 0.68. If the energy demand is the same, the needed rated capacity of the wind generator can be 5 times smaller in the best conditions.

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Section: Methodsmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Evaluating electricity self-consumption in different renewable energy supply conditions

Annuk

Jogi

Kalder

et al. 2018

Engineering for Rural Development

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“…The testing was conducted in Malaysia, which experience approximately stable solar energy source [57] and was utilized to dry various samples including agricultural product [58,59,60]. Moreover, it is important to highlight the importance of research conducted to achieve net zero energy buildings [61], reduce peak energy consumption [62] and improve the processes of solar thermal systems [63][64][65].…”

Section: Orthosiphon Stamineusmentioning

confidence: 99%

Gamma Ray and Neutron Radiation Effects on the Electrical and Structural Properties of n-ZnO/p-CuGaO₂ Schottky Diode

Mivolil

Chee

Rasmidi

et al. 2020

ECS J. Solid State Sci. Technol.

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Solar assisted heat pump (SAHP) system integrates a solar thermal energy source with a heat pump. This technique is a very fundamental concept, especially for drying applications. By combining a solar thermal energy source such as solar thermal collectors and a heat pump dryer will assist in reducing the operation cost of drying and producing products with high quality. Many review papers in the literature evaluated the R&D aspects of solar-assisted heat pump dryers (SAHPD). This critical review paper studies some of the researches conducted in this field to understand and provides an update on recent developments in SAHPD. Also, a detailed explanation of principles and operation for SAHPD and its applications are presented. The used types of solar thermal collectors, as well as various heat pump dryers, are all discussed in this article. Finally, it is concluded that there is a clear lack of research in the techno-economic and environmental evaluation, while most of SAHPD studies focused on the performance study of the system. Keywords heat pump, collector, two phases, refrigerant, compression index. Nomenclature Volumetric efficiency Mass flow rate Mass refrigerant flow Ts Wetted surface temperature P Pressure Uwi Combined coefficient of heat transfer for tube wall, refrigerant and water film V Velocity k Compression index absolute humidity ratio

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“…According to the prior work (Annuk et al, 2017), the cover factor can be increased under given circumstances up to YS=YD=0.6 in case when generation graphs are shaved at 25 % level. Although higher cover factor values are achievable, the limiting factor is an increased energy drain loss to avoid the overheating hazard.…”

mentioning

confidence: 99%

Increasing Electricity Self-Consumption in Residential Buildings by Electricity-to-Heat Conversion and Storage

Jogi

Allik

Hõimoja

et al. 2018

Proccedings of International Scientific Conference "RURAL DEVELOPMENT 2017"

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The current paper addresses energy storage issues in residential buildings with the objective of increasing direct consumption. The building, connected to an utility grid, is supplied by a micro wind turbine and PV panels. The utility grid itself acts as an energy buffer. Only nonshiftable loads (white goods, TV etc.) and electric water heating are taken into account. The studied configuration comprises two cascaded heating boilers, one of them preheating boiler. The annual electricity production of the micro wind turbine and PV panels is chosen to cover the hot water demand and nonshiftable loads inside the building with 70/30 ratio in favour of the wind energy. During the experiments, the generation graphs' shaving levels vary between 0 and 100 %, with peak energy diverted into a preheating boiler and the remaining part fed into the main boiler. The proposed solution allows increasing locally consumed energy share, as the energy of stochastic peaks is stored and used on later demand. The locally consumed energy is expressed by the cover factor, its increase possibilities are studied in main text. Calculations are based on 5-minute time series. The applied algorithm follows the amount of heat in the main and preheating boiler, including also incoming and outgoing energies. The cover factor cannot be increased without restrictions. Too high shaving levels bring along problem of removing excess heat from the preheating boiler. The allowed drain loss is taken as 10 % of annual boiler energy balance. The presumed growth of the cover factor at preheating boiler volume of 160 l instead of 80 l is at least 8 %. with the main boiler sized as before.

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Increasing self electricity consumption by using double water heating tanks for residential net zero-energy buildings

Cited by 14 publications

References 26 publications

Evaluating electricity self-consumption in different renewable energy supply conditions

Evaluating electricity self-consumption in different renewable energy supply conditions

Gamma Ray and Neutron Radiation Effects on the Electrical and Structural Properties of n-ZnO/p-CuGaO₂ Schottky Diode

Increasing Electricity Self-Consumption in Residential Buildings by Electricity-to-Heat Conversion and Storage

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Increasing self electricity consumption by using double water heating tanks for residential net zero-energy buildings

Cited by 14 publications

References 26 publications

Evaluating electricity self-consumption in different renewable energy supply conditions

Evaluating electricity self-consumption in different renewable energy supply conditions

Gamma Ray and Neutron Radiation Effects on the Electrical and Structural Properties of n-ZnO/p-CuGaO2 Schottky Diode

Increasing Electricity Self-Consumption in Residential Buildings by Electricity-to-Heat Conversion and Storage

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Product

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Gamma Ray and Neutron Radiation Effects on the Electrical and Structural Properties of n-ZnO/p-CuGaO₂ Schottky Diode