Façade-integrated photovoltaics: a life cycle and performance assessment case study

2012 ◽  
Vol 20 (8) ◽  
pp. 975-990 ◽  
Author(s):  
Marc J. R. Perez ◽  
Vasilis Fthenakis ◽  
Hyung-Chul Kim ◽  
Anthony O. Pereira
Keyword(s):  
Life Cycle ◽  
Performance Assessment ◽  
And Performance

Preliminary Design and Performance Assessment of an Underwater CAES System (UW-CAES) for Wind Power Balancing

2019 ◽  
Author(s):  
Marco Astolfi ◽  
Giulio Guandalini ◽  
Marco Belloli ◽  
Adriano Hirn ◽  
Paolo Silva ◽  
...  
Keyword(s):  
Energy Storage ◽  
Performance Assessment ◽  
Power Input ◽  
Compressed Air ◽  
Preliminary Design ◽  
Round Trip ◽  
Peak Shaving ◽  
Renewable Power ◽  
And Performance

Abstract A key approach to large renewable power management is based on implementing storage technologies, including batteries, power-to-gas and compressed air energy storage (CAES). This work presents the preliminary design and performance assessment of an innovative type of CAES, based on underwater storage volumes (UW-CAES) and intended for installation in the proximity of deep water seas or lakes. The UW-CAES works with constant hydrostatic pressure storage and variable volumes. The proposed system is adiabatic, not using any fuel to increase the air temperature before expansion; a sufficient TIT is instead obtained through a thermal energy storage system which recovers the compression heat. The system includes (i) a set of turbomachines (modular multi-stage compressor, with partial intercooling; expansion turbine); (ii) a thermal energy storage (TES) system with different temperature levels designed to recover a large fraction of the compression heat, allowing the subsequent heating of air prior to the expansion phase; (iii) an underwater modular compressed air storage, conceived as a network of rigid but open tanks lying on the seabed and allowing a variable-volume and constant pressure operation. The compressor operates at variable loads, following an oscillating renewable power input, according to strategies oriented to improve the overall system dispatchability; the expander can be designed to work either at full load, thanks to the stability of the air flow rate and of the TIT guaranteed by the thermal storage, or at variable load. The paper first discusses in detail the sizing and off-design characterization of the overall system; it is then simulated a case study where the UW-CAES is coupled to a wind farm for peak shaving and dispatchability enhancement, evaluating the impact of a realistic power input on performances and plant flexibility. Although the assessment shall be considered preliminary, it is shown that round trip efficiency in the range of 75%–80% can be obtained depending on the compressor section configuration; making the UW-CAES a promising technology compared to electrochemical and pumped-hydro storage systems. The technology is also applied to perform peak-shaving of the electricity production from a wind park; annual simulations considering part load operation result in global round trip efficiency around 75% with a 10 to 15% reduction in the average unplanned energy injection in the electric grid. The investigated case study provides an example of the potential of this system in providing power output peak shaving when coupled with an intermittent and non-predictable energy source.

scholarly journals Life Cycle Sustainability Performance Assessment Method for Comparison of Civil Engineering Works Design Concepts: Case Study of a Bridge

2020 ◽  
Vol 17 (21) ◽  
pp. 7909 ◽  
Author(s):  
Kristine Ek ◽  
Alexandre Mathern ◽  
Rasmus Rempling ◽  
Petra Brinkhoff ◽  
Mats Karlsson ◽  
...  
Keyword(s):  
Life Cycle ◽  
Performance Assessment ◽  
Civil Engineering ◽  
Sustainability Assessment ◽  
Concrete Slab ◽  
Assessment Method ◽  
Sustainability Performance ◽  
Design Concepts ◽  
Composite Bridge

Standardized and transparent life cycle sustainability performance assessment methods are essential for improving the sustainability of civil engineering works. The purpose of this paper is to demonstrate the potential of using a life cycle sustainability assessment method in a road bridge case study. The method is in line with requirements of relevant standards, uses life cycle assessment, life cycle costs and incomes, and environmental externalities, and applies normalization and weighting of indicators. The case study involves a short-span bridge in a design-build infrastructure project, which was selected for its generality. Two bridge design concepts are assessed and compared: a concrete slab frame bridge and a soil-steel composite bridge. Data available in the contractor’s tender phase are used. The two primary aims of this study are (1) to analyse the practical application potential of the method in carrying out transparent sustainability assessments of design concepts in the early planning and design stages, and (2) to examine the results obtained in the case study to identify indicators in different life cycle stages and elements of the civil engineering works project with the largest impacts on sustainability. The results show that the method facilitates comparisons of the life cycle sustainability performance of design concepts at the indicator and construction element levels, enabling better-informed and more impartial design decisions to be made.

scholarly journals COMISSIONAMENTO DE SISTEMAS PREDIAIS: APLICAÇÃO EM UM BANHEIRO SANITÁRIO

2020 ◽  
Vol 15 (2) ◽  
pp. 262-272
Author(s):  
Armando Traini Ferreira ◽  
Andreson de Sousa Ferreira
Keyword(s):  
Life Cycle ◽  
Residential Developments ◽  
Operation And Maintenance ◽  
Technological Advances ◽  
Building Systems ◽  
Training Professionals ◽  
Design Requirements ◽  
And Performance

RESUMO:  Cada vez mais, os conceitos de projetos e execução de obras, como manutenção dos sistemas prediais, estão sofrendo modificações tecnológicas que visam o melhor planejamento, execução e desempenho. Os avanços tecnológicos acompanhados por bons profissionais contribuem para a qualidade final do empreendimento. Porém, diante deste cenário, existem falhas na concepção dos edifícios. Observa-se então, a importância do comissionamento como um processo de qualidade que colabora com a integração de projetos multidisciplinares além de avaliar e acompanhar as atividades de operação e manutenção dos sistemas prediais, em conformidade com os requisitos do proprietário e premissas originais de projeto. Diante disto, o objetivo deste trabalho é avaliar a aplicação do processo de comissionamento de sistemas prediais, tomando como estudo de caso, um banheiro sanitário. Com isso, pretende-se contribuir para a utilização do comissionamento nas instalações prediais bem como na manutenção de sistemas e qualidade final dos empreendimentos residenciais. ABSTRACT: Increasingly, the concepts of projects and execution of civil works, such as maintenance of the building systems, are undergoing technological modifications aiming at the best planning, execution and performance. The Technological advances accompanied by good professionals contribute to the final quality of the enterprise. All this to meet the owner's design requirements. However, in face of this scenario, there are flaws in the designing buildings. So it can be observed the importance of design requirements as a process to meet the owners in the phases of  building’s life cycle, besides training professionals in the areas of operation and maintenance. Therefore the aim of  this study is evaluate the application  the commissioning process of building systems , taking as a case study, a bathroom toilet.  With this, it is intended to contribute to the use of commissioning in the building installations as well as in the maintenance of systems and final quality of residential developments.

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