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A modified zone model for estimating equivalent room thermal capacity

Hua CHEN, Xiaolin WANG

Frontiers in Energy 2013, Volume 7, Issue 3, Pages 351-357 doi: 10.1007/s11708-013-0254-x

Abstract: The zone model has been widely applied in control analysis of heating, ventilation and air conditioning (HVAC) systems to achieve a high building efficiency. This paper proposed a modified zone model which is much simpler in the HVAC system simulation and has the similar accuracy to the complicated simulation model. The proposed model took into consideration the effect of envelop heat reservoir on the room indoor temperature by introducing the thermal admittance of the inner surfaces of the building enclosure. The thermal admittance for the building enclosure was developed based on the building thermal network analytical theory and transfer function method. The efficacy of the proposed model was demonstrated by comparing it with the complicated model — heat balance method (HTB2 program). The predicted results from the proposed model well agreed with those from the complicated simulation. The proposed model can then make the HVAC system dynamic simulation much faster and more acceptable for control design due to its simplicity and efficiency.

Keywords： room model thermal network analysis transfer function heating ventilation and air conditioning (HVAC) system simulation

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Distribution of background equivalent static wind load on high-rise buildings

Jianguo ZHANG , Ming GU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3, Pages 241-248 doi: 10.1007/s11709-009-0036-z

Abstract: gust load envelope (GLE) methods, are verified in terms of their accuracy in describing the background equivalentBased on the results, formulae of the distribution of background equivalent static load on high-rise

Keywords： high-rise buildings along-wind cross-wind background equivalent static wind load close formulae

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Experimental and numerical investigations of the compressive behavior of carbon fiber-reinforced polymer-strengthened tubular steel T-joints

Peng DENG, Boyi YANG, Xiulong CHEN, Yan LIU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5, Pages 1215-1231 doi: 10.1007/s11709-020-0663-y

Abstract: The numerical analysis results revealed that the development of equivalent plastic strain at the selected

Keywords： tubular T-joint carbon fiber-reinforced polymer degree of damage numerical analysis equivalent plastic

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Moving policy and regulation forward for single-use plastic alternatives

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 3, doi: 10.1007/s11783-021-1423-5

Abstract: The innovation of sustainable and environmentally friendly single-use plastic alternative materials andThe development of single-use plastic alternative products can be promoted fundamentally only by improving

Keywords： Single-use plastic alternatives Policy Regulation Sustainable development

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China’s new problems of food security revealed by the Food Equivalent Unit

Huilong LIN,Ruichao LI,Cangyu JIN,Chong WANG,Maohong WEI,Jizhou REN

Frontiers of Agricultural Science and Engineering 2014, Volume 1, Issue 1, Pages 69-76 doi: 10.15302/J-FASE-2014023

Abstract: Thus, not only grain for human consumption, but also animal foods have been integrated into the Food Equivalent

Keywords： food security nutrition security food equivalent unit grassland agriculture China

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Equivalent circuit and characteristic simulation of a brushless electrically excited synchronous wind

Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3, Pages 420-426 doi: 10.1007/s11465-017-0439-9

Abstract: In view of this problem, the equivalent circuit and electromagnetic torque expression of the BEESG areThe generator is simulated and tested experimentally using the established equivalent circuit model.Results show the validity of the equivalent circuit model.

Keywords： wind power brushless electrically excited synchronous generator hybrid rotor equivalent circuit

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Current scenario and challenges of plastic pollution in Bangladesh: a focus on farmlands and terrestrial

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 6, doi: 10.1007/s11783-023-1666-4

Abstract:

● A global snapshot of plastic waste generation and disposal is analysed

Keywords： Plastic waste Farmlands Terrestrial ecosystem Marine life

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Generalized Plastic Mechanics and Its Application

Zheng Yingren,Kong Liang

Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 21-36

Abstract:

The development of geotechnical plasticity is reviewed and some problems of applying the classic plasticBy giving up the three hypotheses, a generalized plastic potential theory can be obtained from solidmechanics directly, and then the traditional plastic mechanics can be changed to a more generalized plasticmechanics, namely generalized plastic mechanics (GPM).adopting the normality-flow law can be avoided, and the error caused by the arbitrary assumption of plastic

Keywords： geotechnical plastic mechanics generalized plastic mechanics plastic potential yield surface constitutive

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Effects of natural zeolite and sulfate ions on the mechanical properties and microstructure of plastic

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1, Pages 86-98 doi: 10.1007/s11709-021-0793-x

Abstract: strategic materials used in earth-fill embankment dams and in modifying and preventing groundwater flow is plastic

Keywords： plastic concrete sulfate resistance natural zeolite triaxial compression test SEM permeability

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Fault classification and reconfiguration of distribution systems using equivalent capacity margin method

K. Sathish KUMAR, T. JAYABARATHI

Frontiers in Energy 2012, Volume 6, Issue 4, Pages 394-402 doi: 10.1007/s11708-012-0211-0

Abstract: support vector machines (SVM) for prediction of fault classification and the use of the concept of equivalent

Keywords： support vector machines (SVM) structural risk minimization (SRM) equivalent capacity margin (ECM) restoration

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Preventing masks from becoming the next plastic problem

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1413-7

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The road to sustainable use and waste management of plastics in Portugal

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1, Pages 5-5 doi: 10.1007/s11783-021-1439-x

Abstract:

• Portugal recycles 34% of the 40 kg/hab year of plastic packaging waste

Keywords： Single-use plastics Plastic packaging Plastic waste Waste management Waste shipment Lightweightplastic bags

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Effect of RC wall on the development of plastic rotation in the beams of RC frame structures

Amar KAHIL, Aghiles NEKMOUCHE, Said BOUKAIS, Mohand HAMIZI, Naceur Eddine HANNACHI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 3, Pages 318-330 doi: 10.1007/s11709-017-0420-z

Abstract: focused on the behavior of a RC frame with 3 levels and three bays to better visualize the behavior of plasticOnce the plastic hinge control parameters are identified (plastic rotation, ultimate curvature), a strengthening

Keywords： RC/frame RC/wall moment curvature plastic rotation plastic hinge pushover analysis global models

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Influence of recycled polyethylene terephthalate fibres on plastic shrinkage and mechanical properties

Necat ÖZAŞIK; Özgür EREN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 6, Pages 792-802 doi: 10.1007/s11709-022-0849-6

Abstract: Plastic shrinkage resistance and impact resistance tests were also performed according to related standards

Keywords： recycled PET fibre-reinforced concrete mechanical properties plastic shrinkage impact energy

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Several basic problems in plastic theory of geomaterials

Yuanxue LIU, Jiawu ZHOU, Zhongyou LI, Chen CHEN, Yingren ZHENG

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 1, Pages 81-84 doi: 10.1007/s11709-009-0016-3

Abstract: Moreover, several basic problems of plastic theory of geomaterials were discussed.not; the yield surface of geomaterials is not unique, and its number is the same as the freedoms of plastic

Keywords： constitutive relation geomaterials classial plastic theory Drucker Postulate yield surface flow rule