scholarly journals A simplified model for calculating heat transfer through the double skin facade

2021 ◽  
Vol 2069 (1) ◽  
pp. 012097
Author(s):  
G He ◽  
Y Meng ◽  
J Zhu ◽  
S Zhang
Keyword(s):  
Heat Transfer ◽  
High Performance ◽  
Heat Transfer Process ◽  
Energy Simulation ◽  
Heat Gain ◽  
Simulation Tools ◽  
Complex Heat Transfer ◽  
Solar Intensity ◽  
Double Skin ◽  
Heat Transfer Calculation

Abstract Double skin façade (DSF) has been recognized as a flexible type of envelope that can adapt to various building needs, such as insulation, solar heat gain, ventilation, and shading. This adaption ability makes the DSF a potentially high performance envelope. However, the reliable calculation of the heat flow in the DSF has been a challenging task due to the complex heat transfer process involved in the DSF. In this study, we propose a simple model that aims to simplify the heat transfer calculation involved in the DSF. In this model, a characteristic function of heat transfer coefficient (CFHTC) was proposed for the heat transfer between the inner layer and the outside air, which would otherwise call the complex convective heat transfer in the cavity. We use experimental data to demonstrate that this function can be expressed as a function of the incident solar intensity. This CFHTC is supposed to be dependent on the geometry of the DSF. With the CFHTC, the calculation of the heat transfer between the inner layer of the DSF and the outside air is simplified and can be incorporated in energy simulation tools.

A Fast Analytical Method for the Dynamic Energy Simulation of Energy Piles with Short Time Resolution

2021 ◽  
Author(s):  
Walter Grassi ◽  
Paolo Conti ◽  
Eva Schito ◽  
Daniele Testi
Keyword(s):  
Heat Transfer ◽  
Transfer Process ◽  
Time Resolution ◽  
Heat Transfer Process ◽  
Simulation Software ◽  
Energy Simulation ◽  
Ground Source ◽  
Energy Piles ◽  
Dynamic Energy Simulation ◽  
Short Time

Abstract This paper proposes an analytical method for the dynamic thermal simulation of energy piles with a short time resolution (e.g., tens of minutes) as an alternative to numerical approaches, which require relevant computational resources. The discussion is tailored to the implementation of analytical models in dynamic energy simulation software for buildings and HVAC systems. The main modeling challenges consist of accounting for the pile thermal capacity, pipes configuration, and time-varying inlet temperature and flow rate values. The heat transfer process occurs in three characteristic periods, each of them characterized by a 2D or 3D geometry of the heat transfer process. The first period concerns the evolution of the fluid temperature and heat transfer over the length of the pipes, the second period concerns the thermal diffusion within the heat capacity of the foundation, and the third period is driven by pile geometry and ground source characteristics. For short time resolution analyses, we proposed a general linear set of equations based on the e-NTU theory for heat exchangers, the infinite composite-medium line source solution, and the finite line source for the ground source. The proposed method is compared with a full transient 3D numerical simulation. The maximum deviation in terms of return temperature to the heat pump is 0.2 K. The general dimensionless form, the short time resolution, and the limited computational time make the method suitable for building simulation software and optimization codes for thermal analysis and energy pile design.

Simulation and Analysis of Thermal Performance of Internal Recycle Double Skin Facades

2014 ◽  
Vol 580-583 ◽  
pp. 2415-2420 ◽  
Author(s):  
Cun Hui ◽  
Yuan Qing Wang ◽  
Bin Wang ◽  
Wei Tao ◽  
Sheng Lin Zheng
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Ventilation Rate ◽  
Heat Transfer Process ◽  
Comfort Level ◽  
Curtain Wall ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Double Skin Facades

Simulation and analysis of heat transfer process in internal recycle double skin facades (DSF) of the established standard model were carried out by computational fluid dynamics (CFD). Comprehensive heat transfer coefficient under the condition of different ventilation rate of DSF with and without blinds was studied. The results show: the increase of the ventilation rate can not only improve the comprehensive heat transfer coefficient, but also improve the temperature of inner surface of the inner curtain wall. Double skin facades can improve the comfort level of the indoor environment, reduce the energy loss of the palisade structure and reduce energy consumption.

scholarly journals Kinetic algorithms for the modeling of conductive fluids flow on high performance computational systems

2019 ◽  
Vol 489 (6) ◽  
pp. 552-557
Author(s):  
B. N. Chetverushkin ◽  
A. V. Saveliev ◽  
V. I. Saveliev
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Fluid Flow ◽  
High Performance ◽  
Flow Dynamics ◽  
Electrically Conducting ◽  
Electrically Conducting Fluid ◽  
Complex Heat Transfer ◽  
Approach Method ◽  
Computational Systems

This letter presents the results of the mathematical modeling of processes of electrically conducting fluid flow dynamics for complex heat transfer systems. The study was carried out based on detailed calculations on parallel high performance computational systems on the basis of the kinetically consistent magnetogasdynamic approach, adjusted for this class of problems. The kinetically consistent algorithm adapts well to the architecture of high performance computational systems with massive parallelism and makes it possible to conduct effective research of complex heat transfer systems with high resolution. The article presents the approach, method and algorithms as well as the results of the mathematical modeling.

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