Mechanism and preliminary performance analysis of exhaust air insulation for building envelope wall

Wang, Jinbo; Du, Qianzhou; Zhang, Chong; Xu, Xin; Gang, Wenjie

doi:10.1016/j.enbuild.2018.05.045

Cited by 28 publications

(27 citation statements)

References 38 publications

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“…In order proceed with the calculation, it is essential to divide Eq. (16) and (18) into their real and imaginary part. The β coefficient has been manipulated as:…”

Section: Discussionmentioning

confidence: 99%

“…Both Eq. (16) and (18) can now be manipulated, in order to make their respective real and imaginary parts explicit:…”

Section: Discussionmentioning

confidence: 99%

“…In Appendix A, Eq. (16) and (18) are manipulated in order to put in evidence the real and imaginary parts of the complex numbers. At this point the solutions of both the steady-state and the steady-periodic components are available and can be combined using Eq.…”

Section: Steady-periodic Problemmentioning

confidence: 99%

“…Another interesting application of Breathing Walls as a diffused heating device is presented in [17]. Finally, in cooling dominated conditions, some Authors suggest that the porous wall can act as Exhaust Air Insulation [18], where the cold indoor air is expelled through the envelope to partially dispose of the internal energy accumulated by the structures.…”

Section: Introductionmentioning

confidence: 99%

“…Such model was recently experimentally validated in laboratory, although the opportunity to consider a velocity distribution of the inlet air was observed [12]. Modeling BW in transient state has mainly been approached numerically through finite difference methods [20,23], even includ-ing the effect of the air gap channel between the porous layer and the external cladding [18]. Numerical models are the most appropriate for yearly simulations of the BW operation in buildings under realistic climatic and indoor conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental validation of a steady periodic analytical model for Breathing Walls

Alongi

Angelotti

Mazzarella

2020

Building and Environment

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The Breathing Wall behavior under variable boundary conditions is described by an analytical model based on a one-dimensional porous domain crossed by air and subject to third type steady periodic boundary conditions. To the best of the authors' knowledge, its experimental validation is not provided in literature. In this work, a new model is derived considering Dirichlet steady periodic boundary conditions. The model is experimentally validated testing a 1 m 2 no-fines concrete sample in the Dual Air Vented Thermal Box apparatus, specially improved to replicate dynamic thermal conditions. The experiments show that increasing the air flow velocity across the Breathing Wall from 0 to 12 mm/s enhances thermal coupling between the two environments, namely reduces the wall thermal capacity, with a decrease in the penetration time from 4.3 h to 3 h. The model shows a very good agreement with experimental data when predicting temperature distribution across the domain, with error averages and standard deviations within the thermocouple accuracy after calibration, assumed to be 0.15 • C. The lesser yet good agreement concerning conduction heat flux density is explained in terms of accuracy in the measurement of the boundary conditions and critical issues in the heat flow measure itself (i.e. probe thermal resistance, thermal contact, emissivity mismatch).

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“…In order proceed with the calculation, it is essential to divide Eq. (16) and (18) into their real and imaginary part. The β coefficient has been manipulated as:…”

Section: Discussionmentioning

confidence: 99%

“…Both Eq. (16) and (18) can now be manipulated, in order to make their respective real and imaginary parts explicit:…”

Section: Discussionmentioning

confidence: 99%