The overall renewable energy fraction: An alternative performance indicator for evaluating Net Zero Energy Buildings

Panão, Marta J.N. Oliveira

doi:10.1016/j.enbuild.2016.06.057

Cited by 13 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simulation outcomes confirmed that the efficiency is higher in the hybrid system, demonstrating that NZEB target is more difficult to achieve with fossil fuels. Indeed, electricity employment is eased with the hybrid system rather than fossil fuels (e.g., heat pumps against fossil fuels boilers); in addition, renewable energy ratio is not close to zero because it includes off-site energy produced by renewable sources [41]. In detail, the heating efficiency is calculated as the ratio between the total heat produced and the primary fossil energy.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Simulation Model of Trans-Critical Carbon Dioxide Heat Pump Application for Boosting Low Temperature Distribution Networks in Dwellings

et al. 2019

View full text Add to dashboard Cite

This research investigates the role of new hybrid energy system applications for developing a new plant refurbishment strategy to deploy small scale smart energy systems. This work deals with a dynamic simulation of trans-critical carbon dioxide heat pump application for boosting low temperature distribution networks to share heat for dwellings. Heat pumps provide high temperature heat to use the traditional emission systems. The new plant layout consists of an air source heat pump, four trans-critical carbon dioxide heat pumps (CO2-HPs), photovoltaic arrays, and a combined heat and power (CHP) for both domestic hot water production and electricity to partially drive the heat pumps. Furthermore, electric storage devices adoption has been evaluated. That layout has been compared to the traditional one based on separated generation systems using several energy performance indicators. Additionally, a sensitivity analysis on the primary energy saving, primary fossil energy consumptions, renewable energy fraction and renewable heat, with changes in building power to heat ratios, has been carried out. Obtained results highlighted that using the hybrid system with storage device it is possible to get a saving of 50% approximately. Consequently, CO2-HPs and hybrid systems adoption could be a viable option to achieve Near Zero Energy Building (NZEB) qualification.

show abstract

Section: Resultsmentioning

confidence: 99%

Dynamic Simulation Model of Trans-Critical Carbon Dioxide Heat Pump Application for Boosting Low Temperature Distribution Networks in Dwellings

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The Overall Renewable Energy Fraction (OREF) has been introduced alongside the traditional parameter used to assess a building's proximity to achieve net-ZEB, which is the non-renewable primary energy balance [55]. Additionally, the indicator On-Site Energy Fraction (OEF) was extended so that off-site renewable energy was included.…”

Section: Pv Technologiesmentioning

confidence: 99%

Towards Zero: A Review on Strategies in Achieving Net-Zero-Energy and Net-Zero-Carbon Buildings

Lou,

Hsieh

2024

Sustainability

View full text Add to dashboard Cite

The establishment of net-zero-energy and net-zero-carbon buildings can offer significant opportunities to reduce environmental impact in the building sector. Several successful net-zero-energy buildings highlight the feasibility of reducing energy consumption via energy-efficient strategies and the use of renewable energy technologies. To comprehend the existing innovatory designs, techniques, and practices employed to achieve net-zero-energy buildings, this research aims to review the up-to-date advancements in net-zero-energy building practices. The utilization of embodied carbon assessments to achieve the net-zero status of buildings is explored. The findings indicate an escalating global interest and participation in the field of study, and reveal three major areas related to net-zero-energy buildings: multidisciplinary approaches, energy systems, and guidance, which together cover thirteen subfields. The role of life cycle assessment in buildings is emphasized, offering insights into the role of embodied emissions relative to operational emissions over the entire life cycle of a building. In the end, possible future study directions are outlined, including balancing energy efficiency with sustainability, and assessing the impact of design on emissions and economic outcomes. These areas collectively contribute to transforming sustainable building concepts into reality.

show abstract

Techno‐economic assessment of a new biomass‐driven cogeneration system proposed for net zero energy buildings

Mohammadikhah

Javaherdeh

Mahmoudimehr

2021

Env Prog and Sustain Energy

View full text Add to dashboard Cite

This study evaluates the techno‐economic feasibility of a new biomass‐driven cogeneration system designed to fulfill all energy requirements (i.e., electricity, hot water, cooling, and heating) of a grid‐connected building throughout the year. The proposed system is also expected to achieve the goal of zero energy building (ZEB). A 10‐story residential complex is considered as the present case study. The study is carried out for three cities of Iran with different climate conditions (mild, hot, and cold) and with the annual energy requirements of about 104,472 kWh, 128,784 kWh, and 142,518 kWh, respectively. After defining two objective functions (“annual actual benefit” and “loss of building requirements supply probability”), the system is optimized by using the Non‐dominated Sorting Genetic Algorithm (NSGA‐II). The results show that the designed system is economically viable with the levelized cost of energy (LCOE) of about 0.15–0.2 $/kWh. The results also indicate that if the cost of CO2 emission is taken into consideration, the annual benefit of the system is decreased by 16%–25%. Finally, a sensitivity analysis shows that heat generation cost and electricity selling price have the most and the least effect on the system's annual benefit, respectively.

show abstract

The overall renewable energy fraction: An alternative performance indicator for evaluating Net Zero Energy Buildings

Cited by 13 publications

References 12 publications

Dynamic Simulation Model of Trans-Critical Carbon Dioxide Heat Pump Application for Boosting Low Temperature Distribution Networks in Dwellings

Dynamic Simulation Model of Trans-Critical Carbon Dioxide Heat Pump Application for Boosting Low Temperature Distribution Networks in Dwellings

Towards Zero: A Review on Strategies in Achieving Net-Zero-Energy and Net-Zero-Carbon Buildings

Techno‐economic assessment of a new biomass‐driven cogeneration system proposed for net zero energy buildings

Contact Info

Product

Resources

About