Calculation of transient heat transfer through the envelope of an underground cavern using Z-transfer coefficient method

Xiao, Yimin; Liu, Xichen; Zhang, Rongrong

doi:10.1016/j.enbuild.2012.01.040

Cited by 28 publications

(6 citation statements)

References 6 publications

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“…By simplifying the boundary condition for the standby mode, the following assumptions regarding mine refuge chambers are employed to derive the governing equations [20][21][22][23] :…”

Section: One-dimensional Numerical Modelmentioning

confidence: 99%

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Optimization of pre-cooling with intermittent mode

Gao

Yuan

et al. 2018

Sustainable Cities and Society

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Highlights• An intermittent operational mode for PE of the new coupled cooling system is proposed.• A simplified numerical model of intermittent cold storage is established.• PE is divided into two periods, with their own respective evaluation indices proposed.• An interchanging continuous/intermittent cold storage strategy is proposed.• Energy consumption can be reduced by 68-78% as compared to the continuous mode.Abstract：The coupled cooling method combining latent heat thermal energy storage and precooling of the envelope (PE) is a new free-cooling method that is suitable for exposure to high temperatures and other types of harsh environments. PE plays the most critical role in the coupled cooling method. Long-term, continuous PE cannot only reduce energy storage capacity, but it also causes numerous energy waste. Thus, an intermittent operational mode is firstly proposed to improve the heat transfer performance and reduce energy consumption. A simplified numerical model of intermittent thermal storage is established, and the subsequent effects of intermittent ratio (IR) and intermittent period (IP) on cold storage performance have been systematically investigated. Furthermore, the operational period is divided into a cold storage period (CSP) and a cold preservation period (CPP), each with their own respective evaluation indices. Long-term intermittent PE is optimized, and an interchanging continuous/intermittent cold storage strategy is proposed. Under the current operating conditions, as compared with the conventional continuous mode, the duration of CSP is extended by 0-26%, yielding an annual cold storage energy CPP Cold preservation period CSP Cold storage period CTES Cavern thermal energy storage IP Intermittent period IR Intermittent ratio LHTES Latent heat thermal energy storage PCM Phase-change material PE Pre-cooling of the envelope SIMPLE Semi-implicit method for pressure-linked equations SR Surrounding rock TES Thermal energy storage UTES Underground thermal energy storage Dimensionless numbers Bi Biot number Fo Fourier number

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“…By simplifying the boundary condition for the standby mode, the following assumptions regarding mine refuge chambers are employed to derive the governing equations [20][21][22][23] :…”

Section: One-dimensional Numerical Modelmentioning

confidence: 99%

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Optimization of pre-cooling with intermittent mode

Gao

Yuan

et al. 2018

Sustainable Cities and Society

View full text Add to dashboard Cite

show abstract

“…Finally, the governing equations of cold storage capacity are derived for engineering purposes. The following major assumptions for a mine refuge chamber are employed in the derivation of the governing equations [21][22] :…”

Section: Semi-analytical Calculation Of Cold Storage Capacity Of Srmentioning

confidence: 99%

“…ｖ) The chamber can be simplified as a cylinder and heat transfer through walls is one-dimensional [22] ; ｖｉ) Assuming that the thermal physical properties of PCM are constant, but it is different for solid and liquid phases. The change of the density of the fluid is considered only when the influence of the buoyancy is involved [26] .…”

Section: ． Calculation Of Cold Storage Quantity Of Sr and Its Engineementioning

confidence: 99%

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Method and model development

Yuan

Gao

et al. 2017

Energy

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In some special circumstances such as building envelope, Traditional cooling methods can not meet the requirements of safety, stability, reliability and energy saving. In Part I of this study, a new conjugate cooling method of Phase Change Material (PCM) combined with Pre-cooling of Building Envelope (PBE) is proposed and the numerical model of PBE are developed. In the current study, a refuge chamber is selected as a case study. A semi-analytical method is used to analyze the cold storage performance of the surrounding rock (SR). Afterwards, a numerical simulation model of the coupling cooling system, which take the heat source, SR, PCM and air heat transfer into consideration, is further established. The study identified that the simplified semi-analytical calculation formula with the diagram of the cold storage quantity of SR are very helpful for engineering calculation. The influence of the Fourier and Biot number on the cold storage capacity of SR can be easily analyzed. In addition, the whole-field model of the conjugate cooling system is completely developed based on the PCM unit. Part II will involve a parametric assessment and the optimization of the conjugate colling method will be explored.

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“…Their results indicated the thermal conductivity of the rock is an important factor of the heat transfer. Xiao et al [24] proposed a method to calculate the transient heat flow through the envelope of an underground cavern and proved that the method has a good agreement with the numerical results. Liu et al [25] presented a numerical model for the simultaneous heat transfer between air and the tunnel surface.…”

Section: Introductionmentioning

confidence: 95%

Thermal performance analysis of an underground closed chamber with human body heat sources under natural convection

Zhang

Day

Wang

et al. 2018

Applied Thermal Engineering

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Calculation of transient heat transfer through the envelope of an underground cavern using Z-transfer coefficient method

Cited by 28 publications

References 6 publications

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Optimization of pre-cooling with intermittent mode

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Optimization of pre-cooling with intermittent mode

Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Method and model development

Thermal performance analysis of an underground closed chamber with human body heat sources under natural convection

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