scholarly journals Numerical analysis of the effect of freezing ground in the laying zone pads on heat loss of channelless pipelines laid out without canals

2013 ◽  
Vol 37 (2) ◽  
pp. 19-24
Author(s):  
V.Yu. Polovnikov ◽  
V.A. Huzeev
Keyword(s):  
Numerical Analysis ◽  
Heat Loss

Numerical analysis of a hybrid tubular and cavity air receiver for solar thermal applications

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sayuj Sasidharan ◽  
Pradip Dutta
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Numerical Analysis ◽  
Heat Loss ◽  
Solar Thermal ◽  
Heat Transfer Analysis ◽  
Receiver Design ◽  
Radiation Emission ◽  
Content Type ◽  
Thermal Receiver

Purpose This paper aims to deal with characterisation of the thermal performance of a hybrid tubular and cavity solar thermal receiver. Design/methodology/approach The coupled optical-flow-thermal analysis is carried out on the proposed receiver design. Modelling is performed in two and three dimensions for estimating heat loss by natural convection for an upward-facing cavity. Heat loss obtained in two dimensions by solving coupled continuity, momentum and energy equation inside the cavity domain is compared with the loss obtained using an established Nusselt number correlation for realistic receiver performance prediction. Findings It is found that radiation emission from a heated cavity wall to the ambient is the dominant mode of heat loss from the receiver. The findings recommend that fluid flow path must be designed adjacent to the surface exposed to irradiation of concentrated flux to limit conduction heat loss. Research limitations/implications On-sun experimental tests need to be performed to validate the numerical study. Practical implications Numerical analysis of receivers provides guidelines for effective and efficient solar thermal receiver design. Social implications Pressurised air receivers designed from this method can be integrated with Brayton cycles using air or supercritical carbon-dioxide to run a turbine generating electricity using a solar heat source. Originality/value The present paper proposes a novel method for coupling the flux map from ray-tracing analysis and using it as a heat flux boundary condition for performing coupled flow and heat transfer analysis. This is achieved using affine transformation implemented using extrusion coupling tool from COMSOL Multiphysics software package. Cavity surface natural convection heat transfer coefficient is obtained locally based on the surface temperature distribution.

Numerical Analysis of Multi-Layer Continuous Diffusion Furnace Door Gas Curtain

2013 ◽  
Vol 367 ◽  
pp. 462-465
Author(s):  
Sheng Cai Zhang ◽  
Gui Qin Li ◽  
Li Xin Lu ◽  
Peter Mitrouchev ◽  
Cheng Gang Wang
Keyword(s):  
Numerical Analysis ◽  
Heat Loss ◽  
Thermal Load ◽  
Gas Flow ◽  
Time Varying ◽  
Main Aspect ◽  
Temperature Zone ◽  
Furnace Temperature ◽  
Air Curtain ◽  
Reduce Heat Loss

Thermal load oozing out through the door is the main aspect of the temperature zone heat loss of continuous diffusion furnace. In this paper, multi-layer gas curtain is designed to seal the furnace door in order to reduce heat loss and ensure furnace temperature to meet requirements in regulation. The unsteady flow is presented to better reflect complex time-varying velocity and temperature of curtain gas. Flow and temperature field of continuous diffusion door with multi-layer air curtain are numerically analyzed by Renault model and experimentally tested. And the influence parameters are tuned and optimized based on the theoretic numerical analysis and experiment results.

scholarly journals Numerical analysis of the heat loss of stop valves of heat networks

2017 ◽  
Vol 110 ◽  
pp. 01067
Author(s):  
Vyacheslav Polovnikov ◽  
Anatolij Vergun ◽  
Vasilij Sergeenko
Keyword(s):  
Numerical Analysis ◽  
Heat Loss ◽  
Heat Networks

scholarly journals Numerical Analysis of Influence of Engineering Construction in the Area of Placing Fuel Storage Tanks on their Heat Loss

2016 ◽  
Vol 72 ◽  
pp. 01133
Author(s):  
V. Yu. Polovnikov ◽  
F. T. Makhsutbek ◽  
Zh. F. Ozhikenova ◽  
I. K. Zharova
Keyword(s):  
Numerical Analysis ◽  
Heat Loss ◽  
Storage Tanks ◽  
Engineering Construction ◽  
Fuel Storage
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