scholarly journals Performance gap analysis of a new Minergie A/P district

2021 ◽  
Vol 2042 (1) ◽  
pp. 012141
Author(s):  
Pauline Brischoux ◽  
Stefan Schneider ◽  
Pierre Hollmuller
Keyword(s):  
Distribution System ◽  
Gap Analysis ◽  
Performance Standards ◽  
Heating System ◽  
Energy Performance ◽  
Hot Water ◽  
Performance Gap ◽  
Design Values ◽  
Actual Space ◽  
Standard Value

Abstract The eco-district “Les Vergers”, located in Meyrin (Geneva, Switzerland), hosts around 1’350 dwellings and some activities. It is heated by a 5 MWth geothermal centralized heat pump. This study proposes a detailed analysis of the thermal demand of 23 selected buildings in this district as a representative panel of buildings meeting high swiss energy performance standards (Minergie A/P) and equipped with different heat recovery systems. Although the buildings have better thermal performance than the average buildings of Geneva, most show an important performance gap between the actual space heating demand and the design values. A strong correlation between performance gap and cut-off temperature of the heating system suggests that the regulation of the heat distribution system plays a determinant role in the overall performance. Regarding the domestic hot water preparation, the buildings of this district present an average demand 23% lower than the standard value and 31% lower than a benchmark.

scholarly journals Dynamic Energy Performance Gap Analysis of a University Building: Case Studies at UAE University Campus, UAE

2020 ◽  
Vol 13 (1) ◽  
pp. 120
Author(s):  
Young Ki Kim ◽  
Lindita Bande ◽  
Kheira Anissa Tabet Aoul ◽  
Hasim Altan
Keyword(s):  
Dynamic Simulation ◽  
Gap Analysis ◽  
Building Energy ◽  
Energy Performance ◽  
Facility Management ◽  
Indoor Environmental Quality ◽  
Energy Audit ◽  
Performance Gap ◽  
Dynamic Simulation Model

As a result of an increasing demand for energy-efficient buildings with a better experience of user comfort, the built environment sector needs to consider the prediction of building energy performance, which during the design phase, is achieved when a building is handed over and used. There is, however, significant evidence that shows that buildings do not perform as anticipated. This discrepancy is commonly described as the ‘energy performance gap’. Building energy audit and post occupancy evaluation (POE) are among the most efficient processes to identify and reduce the energy performance gap and improve indoor environmental quality by observing, monitoring, and the documentation of in-use buildings’ operating performance. In this study, a case study of UAE university buildings’ energy audit, POE, and dynamic simulation were carried out to first, identify factors of the dynamic energy performance gap, and then to identify the utility of the strategy for reducing the gap. Furthermore, the building energy audit data and POE were applied in order to validate and calibrate a dynamic simulation model. This research demonstrated that the case study building’s systems were not operating as designed and almost a quarter of the cooling energy was wasted due to the fault of the building facility management of the mechanical systems. The more research findings were discussed in the paper.

scholarly journals Natural gas heating in Serbian settlements according to urbanity parameters

2008 ◽  
Vol 6 (1) ◽  
pp. 139-153 ◽  
Author(s):  
Dejan Brkic
Keyword(s):  
Natural Gas ◽  
Distribution System ◽  
Optimal Solution ◽  
District Heating ◽  
Heating System ◽  
Hot Water ◽  
Gas Distribution ◽  
District Heating System ◽  
Energy Supply System ◽  
Gas Heating

Natural gas can be directly used for heating of flats by gas distribution system. Indirectly, heating power plant can disburse natural gas and deliver hot water or steam for heating of flats. Decision of optimal way for gas heating usage is done based on spatial disposal of building, number and size of buildings in settlement, etc. Optimal solution, between gas distribution and district heating system (local or district heating by natural gas), can be done according to methodology (model approach) shown in this paper. According to variety of Serbian settlements (in density, size and layout of buildings) model which has ability to represent their different characteristics is formed. This model could be simple and useful tool for initial decision about energy supply system.

Energy performance of a solar hybrid collector system in a multistory apartment building

2005 ◽  
Vol 219 (1) ◽  
pp. 1-11 ◽  
Author(s):  
T T Chow ◽  
A L S Chan ◽  
K F Fong ◽  
W C Lo ◽  
C L Song
Keyword(s):  
Heating System ◽  
Energy Performance ◽  
Hot Water ◽  
Energy Output ◽  
Warm Climate ◽  
Apartment Building ◽  
Water Heaters ◽  
Collector System ◽  
Design Requirements ◽  
Water Collector

Solar co-generation applied in buildings has the advantage of increasing the energy output per unit installed collector area. This paper investigates a centralized photovoltaic and hot-water collector system that can serve as a water pre-heating system for a multistory apartment building in a warm climate region. Collectors are mounted on vertical facades. Electricity generated by the system is consumed by the circulation pumps and the water heaters. The facade integration, together with the heat and electricity co-generation, are features embedding both active and passive solar technology. A numerical model that analyzes its energy performance in an apartment building in Hong Kong is described. The study has been based on practical design requirements. It is estimated that, with the use of amorphous-silicon hybrid collectors which cover two-thirds of the west- and south-facing facades, the system is able to support one-third of the thermal energy required for water heating.

scholarly journals Performance Modelling of Dual Air/Water Collector in Solar Water and Space Heating Application

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Viacheslav Shemelin ◽  
Tomas Matuska
Keyword(s):  
Solar Collector ◽  
Heating System ◽  
Energy Performance ◽  
Hot Water ◽  
Energy Yield ◽  
Building Performance ◽  
Performance Modelling ◽  
Domestic Hot Water ◽  
Air Heating ◽  
Water Collector

In the present work, the detailed mathematical model of a dual air/water solar collector (DAWC) has been developed and experimentally verified. To demonstrate the application of the DAWC, three buildings with different energy performance levels and three building locations were chosen in analyzed case studies. Four solar collector systems were compared with one another. The solar yield of the described systems was determined by simulation using the detailed theoretical model of DAWC. The results indicate that in the case of combining a domestic hot water preparation system and recirculating-air heating system based on DAWC, it is possible to achieve up to 30% higher solar energy yield compared to a conventional solar domestic hot water preparation system dependent on climate and building performance.

scholarly journals Natural gas heating in Serbian settlements according to urbanity parameters

2017 ◽  
Author(s):  
Dejan Brkić
Keyword(s):  
Natural Gas ◽  
Distribution System ◽  
Optimal Solution ◽  
District Heating ◽  
Heating System ◽  
Hot Water ◽  
Gas Distribution ◽  
District Heating System ◽  
Energy Supply System ◽  
Gas Heating

Natural gas can be directly used for heating of flats by gas distribution system. Indirectly, heating power plant can disburse natural gas and deliver hot water or steam for heating of flats. Decision of optimal way for gas heating usage is done based on spatial disposal of building, number and size of buildings in settlement, etc. Optimal solution, between gas distribution and district heating system (local or district heating by natural gas), can be done according to methodology (model approach) shown in this paper. According to variety of Serbian settlements (in density, size and layout of buildings) model which has ability to represent their different characteristics is formed. This model could be simple and useful tool for initial decision about energy supply system.

scholarly journals Energy Performance Gap Analysis in Energy Efficient Residential Buildings in Lithuania

2021 ◽  
Vol 25 (1) ◽  
pp. 610-620
Author(s):  
Violeta Motuzienė ◽  
Vilūnė Lapinskienė ◽  
Genrika Rynkun ◽  
Jonas Bielskus
Keyword(s):  
Energy Demand ◽  
High Performance ◽  
Gap Analysis ◽  
Residential Buildings ◽  
Energy Performance ◽  
High Energy ◽  
Positive Energy ◽  
Performance Gap ◽  
Class A ◽  
Very High Energy

Abstract Implementing provisions of the EPBD all Member States require to provide EPC (Energy Performance Certificate) when buildings are c onstructed, sold or rented. The purpose of the certificate is to compare buildings’ performance and inform the end-users. However, quite many mismatches and discrepancies could be found when comparing actual energy consumption with the once declared by the EPC. This mismatch of energy demand is known as Energy Performance Gap (EPG). It was analysed by different researchers on national levels. In the study, an overall overview of the high-performance buildings in Lithuania is performed and EPG is analysed using statistical indicators. Analysis has shown that for class A the EPG varies from −101 % to +77 %. More buildings are found to have a positive Energy Performance Gap. For class A+ and A++ variations are within a narrower interval: from +18 to 76 % and from +23 to 77 % accordingly. It confirms the findings in the other countries that very high-energy performance buildings tend to consume more than predicted. Also it is confirmed that despite differences in national certification methodologies, the same problem (just of different scale) exists and EPC schemes need revisions.

scholarly journals Impact of Users’ Behavior and Real Weather Conditions on the Energy Consumption of Tenement Houses in Wroclaw, Poland: Energy Performance Gap Simulation Based on a Model Calibrated by Field Measurements

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6707
Author(s):  
Małgorzata Szulgowska-Zgrzywa ◽  
Ewelina Stefanowicz ◽  
Krzysztof Piechurski ◽  
Agnieszka Chmielewska ◽  
Marek Kowalczyk
Keyword(s):  
Energy Consumption ◽  
Energy Gap ◽  
District Heating ◽  
Field Measurements ◽  
Weather Conditions ◽  
Energy Performance ◽  
Hot Water ◽  
Performance Gap ◽  
Final Energy Consumption ◽  
The Impact

This paper presents the results of measuring the final energy consumption for heating and domestic hot water (DHW) preparation and indoor conditions in 15 apartments located in pre-war tenement houses. The measurements were compared to the computed energy consumption. The calculations ware made based on the model calibrated by field measurements. The discrepancies between measurements and calculations were assessed using the energy performance gap (EPG). Calculations were made separately for energy for heating and for DHW preparation. Additionally, the results of EPG calculations for different levels of analysis are presented aiming at assessing the impact of weather, temperature in the surrounding zones and users’ behavior. Users’ behaviors influencing the size of the EPG were divided into typical (energy saving or excessive energy consumption) and forced (energy poverty, response to the apartment’s surroundings, technical limitations. The connection between the heating sources and the heating habits has been clearly observed in the research. The former (typical) behaviors were the origin of the energy gap in the apartments heated with natural gas and district heating. The latter (forced) were the origin of the gap in the apartments heated with mostly electricity and solid fuel (with one exception: one apartment that utilized the district heating).

scholarly journals Managing energy performance in buildings from design to operation using modelling and calibration

2021 ◽  
pp. 014362442110083
Author(s):  
Nishesh Jain ◽  
Esfand Burman ◽  
Dejan Mumovic ◽  
Mike Davies
Keyword(s):  
Best Practice ◽  
Good Practice ◽  
Energy Performance ◽  
Operating Conditions ◽  
Design Stage ◽  
Performance Gap ◽  
Actual Performance ◽  
Simulation Tools ◽  
Calibration Protocol ◽  
Covering Design

To manage the concerns regarding the energy performance gap in buildings, a structured and longitudinal performance assessment of buildings, covering design through to operation, is necessary. Modelling can form an integral part of this process by ensuring that a good practice design stage modelling is followed by an ongoing evaluation of operational stage performance using a robust calibration protocol. In this paper, we demonstrate, via a case study of an office building, how a good practice design stage model can be fine-tuned for operational stage using a new framework that helps validate the causes for deviations of actual performance from design intents. This paper maps the modelling based process of tracking building performance from design to operation, identifying the various types of performance gaps. Further, during the operational stage, the framework provides a systematic way to separate the effect of (i) operating conditions that are driven by the building’s actual function and occupancy as compared with the design assumptions, and (ii) the effect of potential technical issues that cause underperformance. As the identification of issues is based on energy modelling, the process requires use of advanced and well-documented simulation tools. The paper concludes with providing an outline of the software platform requirements needed to generate robust design models and their calibration for operational performance assessments. Practical application The paper’s findings are a useful guide for building industry professionals to manage the performance gap with appropriate accuracy through a robust methodology in an easy to use workflow. The methodological framework to analyse building energy performance in-use links best practice design stage modelling guidance with a robust operational stage investigation. It helps designers, contractors, building managers and other stakeholders with an understanding of procedures to follow to undertake an effective measurement and verification exercise.

Sign in / Sign up

Export Citation Format

Share Document