scholarly journals Energy performance for residential building – comparison between theoretical method and real measurements

2018 ◽  
Vol 44 ◽  
pp. 00009 ◽  
Author(s):  
Małgorzata Basińska ◽  
Katarzyna Ratajczak ◽  
Jan Tomczyk
Keyword(s):  
Energy Consumption ◽  
Residential Building ◽  
Theoretical Method ◽  
Energy Performance ◽  
Hot Water ◽  
Climatic Data ◽  
Domestic Hot Water ◽  
Gas Consumption ◽  
Family Building ◽  
Over Time

This paper presents an energy performance of residential building (two – family building) located in Poznan. Both apartments were analysed separately. By using a method of energy performance calculations valid in Poland, a theoretical energy performance had been prepared. The calculations were conducted assuming real changeability of climatic data in years: 2010–2017. The real energy performance was prepared based on actual gas consumption for the purpose of heating and domestic hot water preparation (DHW) within the years of measurements taken, being a subject of analysis. The findings from this study revealed that a theoretical energy performance significantly deviates from the results obtained by means of energy consumption measurements, which resulted from variability of basic climatic data over time and also from theoretical usage profile of the apartments.

scholarly journals Analysis and simulation of the circulation pump operation

2019 ◽  
Vol 116 ◽  
pp. 00022
Author(s):  
Michał Fijewski ◽  
Iwona Polarczyk ◽  
Joanna Paduchowska
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Measurement Data ◽  
Residential Building ◽  
Hot Water ◽  
Operation System ◽  
Actual Measurement ◽  
Pump Operation ◽  
Domestic Hot Water ◽  
Circulation Pump

The operation of the circulation installation has a significant impact on the energy efficiency of the building and it contributes to its reduction. The article refers to the actual measurement data obtained from the measurements of the domestic hot water (DHW) preparation system in a multi-family residential building in Wroclaw. On their basis, various possibilities of controlling the operation of the circulation installation without reducing the comfort of DHW operation system were presented and simulated. The results are illustrated in the form of measurable savings in energy consumption and related costs.

scholarly journals Real Domestic Hot Water Consumption in Residential Buildings and Its Impact on Buildings’ Energy Performance—Case Study in Poland

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5010
Author(s):  
Katarzyna Ratajczak ◽  
Katarzyna Michalak ◽  
Michał Narojczyk ◽  
Łukasz Amanowicz
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
Water Consumption ◽  
Residential Buildings ◽  
Energy Performance ◽  
Primary Energy ◽  
Hot Water ◽  
Domestic Hot Water ◽  
Total Energy Balance ◽  
Consumption Rates

A building’s energy consumption is assessed considering the energy required for heating, cooling, lighting, and domestic hot water (DHW). Methodologies used to calculate energy certificates in European Union countries consider hot water consumption rates per person or per heated (floor) area, giving wide-ranging values (35–88 dm3/person/day). Using extreme parameters, it is possible to obtain a primary energy index that meets the legal requirements, although unrealistically large proportions of domestic hot water use relative to the total energy balance of the building may marginalize the influence of other components, such as fluctuations in heating, ventilation, or lighting. In the current work, the DHW consumption of three residential buildings was measured to verify the energy consumption for hot water preparation. Investigations were conducted based on the consumption of natural gas for DHW preparation. Experimentally obtained water consumption rates were determined per m2 of a dwelling and per person living in the building. The calculated indicators (0.85 ± 0.005 dm3/m2/day and 27.4 ± 1.4 dm3/person/day) were lower than those used for energy certifications of buildings. The experimentally obtained indicators were used in further theoretical energy assessments of six residential buildings. By adopting the designated indicators, the analyzed buildings met the legally required primary energy value (<70 kWh/m2/year) when using natural gas as a heat source. Applying more realistic DHW consumption values resulted in more accurate energy certifications.

scholarly journals Energy Performance Monitoring and Analysis of NetZero Energy Homes (NZEHs)

2015 ◽  
pp. 449-456
Author(s):  
Hong Xian Li ◽  
Haitao Yu ◽  
Mustafa Gul ◽  
Mohamed Al-Hussein ◽  
Ahmad Alrifai ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Performance Monitoring ◽  
Energy Use ◽  
Residential Building ◽  
Energy Performance ◽  
Hot Water ◽  
Sensor Technology ◽  
Total Energy Consumption ◽  
Energy Demands ◽  
Consumption Energy

Residential building operations consume a considerable amount of energy, especially in coldclimate regions. The National Energy Board of Canada (NEB) analyzed energy consumption in 2011, and found that energy use in the residential sector, including space heating/cooling, hot water heating, lighting, appliances, and other energy-using devices, accounts for 14% of the total energy consumption nationally. The concept of NetZero-energy homes (NZEHs) has emerged as a solution to reduce the energy demands of residential building operations. Following efforts to develop NZEHs, the actual energy performance of these homes needs to be examined, and sensor technology is capable of measuring this energy consumption in detail. In this research, sensor instrumentation is customized for NZEH projects developed by Landmark Group of Builders in Edmonton, Canada. Data is collected for the first month and following winter months, then the collected data is validated and cleaned and is analyzed in terms of energy consumption, energy generation, and energy balance. Based on the analysis, recommendations for the operation of NZEHs are proposed.

scholarly journals Least Cost Analysis of Energy Efficiency Upgrades for Ontario Using Trnsys

2021 ◽  
Author(s):  
Amir Fereidouni Kondri
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Cost Analysis ◽  
Energy Efficient ◽  
Life Cycle Cost ◽  
Net Present Value ◽  
Hot Water ◽  
Life Cycle Costs ◽  
Residential Housing ◽  
Domestic Hot Water

This report presents the methodology for determining least cost energy efficient upgrade solutions in new residential housing using brute force sequential search (BFSS) method for integration into the reference house to reduce energy consumption while minimizing the net present value (NPV) of life cycle costs. The results showed that, based on the life cycle cost analysis of 30 years, the optimal upgrades resulted in the average of 19.25% (case 1), 31% (case 2a), and 21% (case 2b) reduction in annual energy consumption. Economic conditions affect the sequencing of the upgrades. In this respect the preferred upgrades to be performed in order are; domestic hot water heating, above grade wall insulation, cooling systems, ceiling insulation, floor insulation, heat recovery ventilator, basement slab insulation and below grade wall insulation. When the gas commodity pricing becomes high, the more energy efficient upgrades for domestic hot water (DHW) get selected at a cost premium.

scholarly journals Analysis of Annual Energy Use Intensities (EUIs) by End-Use in Apartment Units According to Stratification Variables (2017 – 2018)

2019 ◽  
Vol 111 ◽  
pp. 04013
Author(s):  
Hye-Sun Jin ◽  
Han-Young Lim ◽  
You-Jeong Kim ◽  
Soo-Jin Lee ◽  
Sung-Im Kim ◽  
...  
Keyword(s):  
Information System ◽  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Use ◽  
Hot Water ◽  
Space Heating ◽  
Building Sector ◽  
Domestic Hot Water ◽  
Space Cooling ◽  
End Use

To achieve the goal of reducing greenhouses gases, many countries have recognized the importance of energy conservation in the building sector, and such countries are considerably strengthening their building energy conservation policies by reinforcing design standards, encouraging remodeling, and requiring zero-energy construction. In order to effectively strengthen these policies, it is necessary to provide information concerning energy consumption in the building sector to ensure the technical and economic feasibility of policies in the marketplace, and to allow building users and policy makers to easily access and understand energy consumption characteristics. It is important to provide information that allows people to effectively understand the state of energy consumption by end-use (space heating, space cooling, domestic hot water, etc.) as part of the creation of a concrete plan for energy reduction that incorporates various service systems and is familiar to people. This is because providing such information plays an important role in establishing concrete policies and encouraging voluntary energy performance improvements by building occupants. South Korea operates the Korea Energy Statistics Information System (KESIS) and the information provided by this type of information system consists mainly of energy consumption by energy source (electricity, gas, etc.), and such systems remain inadequate for providing effective information on energy consumption and energy use intensity (EUI) by end-use (space heating, space cooling, domestic hot water, etc.) as part of the creation of a concrete plan for energy conservation. In order to accurately provide energy consumption information by end-use rather than limit the information to mainly consumption corresponding to energy sources, in this study, measurement systems were installed in 2014 ~ 2016 based on the overall sampling designs of previous studies for apartment units, classifications, measurement and data gathering methods for energy consumption by end-use. The annual statistical values for EUI by end-use were collected from the measurement data for 71 sample apartment units from May 2017 to April 2018. This data was calculated and analyzed using stratification variable levels for completion year, supplied area, and the heat source type.

scholarly journals Systematic Simplified Simulation Methodology for Deep Energy Retrofitting Towards Nze Targets Using Life Cycle Energy Assessment

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3038 ◽  
Author(s):  
José Sánchez Ramos ◽  
MCarmen Guerrero Delgado ◽  
Servando Álvarez Domínguez ◽  
José Luis Molina Félix ◽  
Francisco José Sánchez de la Flor ◽  
...  
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Energy Savings ◽  
Residential Building ◽  
Energy Performance ◽  
Simulation Tools ◽  
Energy Assessment ◽  
Energy Efficiency Improvement ◽  
The Difference ◽  
Reduction Of Energy Consumption

The reduction of energy consumption in the residential sector presents substantial potential through the implementation of energy efficiency improvement measures. Current trends involve the use of simulation tools which obtain the buildings’ energy performance to support the development of possible solutions to help reduce energy consumption. However, simulation tools demand considerable amounts of data regarding the buildings’ geometry, construction, and frequency of use. Additionally, the measured values tend to be different from the estimated values obtained with the use of energy simulation programs, an issue known as the ‘performance gap’. The proposed methodology provides a solution for both of the aforementioned problems, since the amount of data needed is considerably reduced and the results are calibrated using measured values. This new approach allows to find an optimal retrofitting project by life cycle energy assessment, in terms of cost and energy savings, for individual buildings as well as several blocks of buildings. Furthermore, the potential for implementation of the methodology is proven by obtaining a comprehensive energy rehabilitation plan for a residential building. The developed methodology provides highly accurate estimates of energy savings, directly linked to the buildings’ real energy needs, reducing the difference between the consumption measured and the predictions.

scholarly journals Analysis of energy signatures and planning of heating and domestic hot water energy use in buildings in Norway

2019 ◽  
Vol 111 ◽  
pp. 06009
Author(s):  
Tymofii Tereshchenko, ◽  
Dmytro Ivanko ◽  
Natasa Nord ◽  
Igor Sartori
Keyword(s):  
Energy Use ◽  
District Heating ◽  
Energy System ◽  
Energy Performance ◽  
Multiple Regression Model ◽  
Hot Water ◽  
Temperature Dependent ◽  
Domestic Hot Water ◽  
Dependent Part ◽  
Energy Signature

Widespread introduction of low energy buildings (LEBs), passive houses, and zero emission buildings (ZEBs) are national target in Norway. In order to achieve better energy performance in these types of buildings and successfully integrate them in energy system, reliable planning and prediction techniques for heat energy use are required. However, the issue of energy planning in LEBs currently remains challenging for district heating companies. This article proposed an improved methodology for planning and analysis of domestic hot water and heating energy use in LEBs based on energy signature method. The methodology was tested on a passive school in Oslo, Norway. In order to divide energy signature curve on temperature dependent and independent parts, it was proposed to use piecewise regression. Each of these parts were analyzed separately. The problem of dealing with outliers and selection of the factors that had impact of energy was considered. For temperature dependent part, the different methods of modelling were compared by statistical criteria. The investigation showed that linear multiple regression model resulted in better accuracy in the prediction than SVM, PLS, and LASSO models. In order to explain temperature independent part of energy signature the hourly profiles of energy use were developed.

scholarly journals A Statistical Approach for Selecting Buildings for Experimental Measurement of HVAC Needs

2017 ◽  
Vol 24 (1) ◽  
pp. 99-116
Author(s):  
Paweł Malinowski ◽  
Piotr Ziembicki
Keyword(s):  
Energy Consumption ◽  
Experimental Measurement ◽  
Numerical Experiments ◽  
Statistical Approach ◽  
Residential Buildings ◽  
Hvac Systems ◽  
Hot Water ◽  
Statistical Methodology ◽  
Domestic Hot Water ◽  
Water Demands

Abstract This article presents a statistical methodology for selecting representative buildings for experimentally evaluating the performance of HVAC systems, especially in terms of energy consumption. The proposed approach is based on the k-means method. The algorithm for this method is conceptually simple, allowing it to be easily implemented. The method can be applied to large quantities of data with unknown distributions. The method was tested using numerical experiments to determine the hourly, daily, and yearly heat values and the domestic hot water demands of residential buildings in Poland. Due to its simplicity, the proposed approach is very promising for use in engineering applications and is applicable to testing the performance of many HVAC systems.

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