Practice of net Positive Energy House in the Suburb of Tokyo

Takase, Kozo; Kawashima, Norihisa; Sato, Keika; Ohnuma, Yukari

doi:10.1016/j.egypro.2017.12.657

Cited by 4 publications

(3 citation statements)

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“…Many building energy professionals rely on steady-state simulation tools to design and construct PEBs, with no performance data from real-time projects. Simple stationary or semi-stationary calculation tools are often used to design PEBs, with high confidence in building energy performance without estimating the cumulative uncertainty derived from the uncertainty of every input values; for instance, the weather data used in most of the simulations are outdated or fail to represent that exact location [143]. The dynamic energy simulation software is not exploited to its maximum potential, as some aspects for evaluating buildings' performance in detailed are considered less critical [131].…”

Section: Challenges and Bottlenecksmentioning

confidence: 99%

State-of-the-Art Review of Positive Energy Building and Community Systems

Kumar

Cao

2021

Energies

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A positive energy system that produces more renewable energy than its demand while ensuring appropriate comfort levels is an excellent path towards increasing the portion of renewable energy, reducing carbon emission, and increasing the energy system’s overall performance. In particular, it has been believed as step forward towards zero energy systems. Recent progress in positive energy building and community levels is gaining interest among different stakeholders. However, an inadequate understanding of the positive energy system is widely noticed in many projects, and a shortage of standard details on the positive energy system still prevails in the research community. Therefore, a state-of-the-art review of positive energy building and community is conducted in this paper. Firstly, this paper begins with the definitions and concepts of positive energy buildings and communities. Secondly, it comprehensively describes the energy supplies, demands, indicators, storage, energy management, roles of stakeholders, and bottlenecks of positive energy systems. Thirdly, the main differences between positive energy buildings and communities are summarized. Fourthly, the impact of smart energy grids and new energy vehicles on the positive energy buildings and communities is derived. As a conclusion, this paper shows that even though all the energy-efficient buildings such as passive buildings, nearly zero energy buildings, zero energy buildings, positive energy buildings look like an up-trending scale of renewable penetration, considerable differences are visible among all, and the same thing applies to the community level. Furthermore, considerable differences exist when comparing between positive buildings and communities regarding both the technical and economic perspectives.

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Section: Challenges and Bottlenecksmentioning

confidence: 99%

State-of-the-Art Review of Positive Energy Building and Community Systems

Kumar

Cao

2021

Energies

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“…An energy-positive building can be defined, as a building where the total energy generated over the year is significantly greater than the energy needed to operate the building, including heating, ventilation, lighting and appliances [11]. Energy-positive buildings are generally based on a Passivhaus approach to reduce demand [12,13], with renewable energy generation a major feature [14]. An early example is the Frieburg Solar Community [15], which demonstrated that a whole estate could achieve energy-positive performance, although some individual houses could not due to design variations.…”

Section: Introductionmentioning

confidence: 99%

Energy-Positive House: Performance Assessment through Simulation and Measurement

Jones

Bassas

et al. 2020

Energies

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This paper presents the results for the operating energy performance of the smart operation for a low carbon energy region (SOLCER) house. The house design is based on a ‘systems’ approach, which integrates the building technologies for electrical and thermal energy systems, together with the architectural design. It is based on the concept of ‘energy positive’ buildings, utilising renewable energy systems which form part of the building envelope construction. The paper describes how the building energy model HTB2, with a range of additional ‘plugins’, has been used to simulate specific elements of the design and the overall energy performance of the house. Measurement data have been used in combination with the energy simulation results to evaluate the performance of the building together with its systems, and identifying the energy performance of individual components of the building. The study has indicated that an energy-positive performance can be achieved through an integrative systems approach. The analysis has indicated that the house, under normal occupancy, needs to import about 26% of its energy from the grid, but over the year its potential export to import ratio can reach 1.3:1. The paper discusses the performance gap between design and operation. It also considers the contribution of a transpired solar air collector (TSC) to space heating. The results have been used to gain a detailed understanding of energy-positive performance.

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“…After a noteworthy development of technologies and solutions for nearly and net zero energy buildings (e.g., [8][9][10]), the international concept development has been towards positive energy buildings (e.g., [11,12]). For instance, computational study in the North America shows that the passive buildings can be converted into a net zero energy building by using photovoltaic panels in the cost-effective way [13].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Towards positive energy communities at high latitudes

Rehman

Reda

Paiho

et al. 2019

Energy Conversion and Management

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Solar and wind energy are the significant renewable energy sources that can be used to tackle the climate change issue.The aim of the study is to design and compare different architectures of community-level energy systems, in order to find a positive energy community in cold climate. The design proposed is a centralized solar district heating network, which is integrated with renewable-based electricity network to meet the heating and electrical demand of a community of 100 houses. The renewable-based energy system consists of photovoltaic panels, wind turbines and stationary electrical storage. In present study the demand of the building appliances, district heating network auxiliaries and electric vehicles are included. TRNSYS is used to simulate these systems. Lastly, multi-objective optimization is done using MOBO (Multi-objective optimization tool). The objective of the optimization problem is to minimize two objective functions-the imported electricity and the life cycle costs. The onsite energy fraction, matching and exported electricity are also evaluated for comparison. The optimization results illustrate that in terms of imported energy, the cases with 600 kW (200 wind turbines) and storages are better compared to the cases without the turbines and storage.For the high performing system (200 turbines with storages and 75 electric vehicles), the corresponding onsite energy fraction (OEF) varied from 1% to 97% and the onsite energy matching (OEM) varied from 76% to 62%, respectively, while the imported electricity can be reduced to 2 kWh/m 2 /yr. However without storage, the onsite energy fraction (OEF) varied from 1% to 58% and the onsite energy matching (OEM) varied from 90% to 27% respectively. In all the systems, initially investments are made in the wind turbines, storages and lastly in the photovoltaic panels to improve the performance of the optimized solutions. It is found that storages can improve the onsite fraction and matching. Moreover, photovoltaic becomes more important in the cases with higher number of electric vehicles.

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Practice of net Positive Energy House in the Suburb of Tokyo

Cited by 4 publications

References 0 publications

State-of-the-Art Review of Positive Energy Building and Community Systems

State-of-the-Art Review of Positive Energy Building and Community Systems

Energy-Positive House: Performance Assessment through Simulation and Measurement

Towards positive energy communities at high latitudes

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