An accurate lumped convective plus radiative heat exchanger model for performance-based modelling

There are several thermo-fluid process modelling tools available on the market which can be used to analyze the off-design performance of thermal plants. These tools all offer the user with a simple convective heat exchanger component that requires the design-base process conditions as inputs. The t...

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Autor principal:	Fuls Wim
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/89457e418ad3426aad0455ea60433046
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id	oai:doaj.org-article:89457e418ad3426aad0455ea60433046
record_format	dspace
spelling	oai:doaj.org-article:89457e418ad3426aad0455ea604330462021-12-02T17:13:35ZAn accurate lumped convective plus radiative heat exchanger model for performance-based modelling2261-236X10.1051/matecconf/202134700007https://doaj.org/article/89457e418ad3426aad0455ea604330462021-01-01T00:00:00Zhttps://www.matec-conferences.org/articles/matecconf/pdf/2021/16/matecconf_sacam21_00007.pdfhttps://doaj.org/toc/2261-236XThere are several thermo-fluid process modelling tools available on the market which can be used to analyze the off-design performance of thermal plants. These tools all offer the user with a simple convective heat exchanger component that requires the design-base process conditions as inputs. The tools would then calculate an effective overall heat transfer factor (UA) and make use of gas flow mass ratios to scale the UA value for off-design conditions. The models employed in these tools assume that the contribution of gas radiation is insignificant, hence only applies convection scaling laws. This paper presents an improved model which considers the contribution of the gas and particle radiation, as is often encountered in the first few heaters in coal fired boilers and heat recovery steam generators. A more fundamental scaling law is applied for the convection scaling and incorporates a cleanliness factor which allows for the consideration of fouling of the heater surfaces. The model’s performance was validated against a discretized tube-level heater model that solves the fundamental convection and radiation terms. The model is accurate within 1% for the cases considered, as compared to more than 20% error if radiation contribution is not considered.Fuls WimEDP SciencesarticleEngineering (General). Civil engineering (General)TA1-2040ENFRMATEC Web of Conferences, Vol 347, p 00007 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Fuls Wim An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
description	There are several thermo-fluid process modelling tools available on the market which can be used to analyze the off-design performance of thermal plants. These tools all offer the user with a simple convective heat exchanger component that requires the design-base process conditions as inputs. The tools would then calculate an effective overall heat transfer factor (UA) and make use of gas flow mass ratios to scale the UA value for off-design conditions. The models employed in these tools assume that the contribution of gas radiation is insignificant, hence only applies convection scaling laws. This paper presents an improved model which considers the contribution of the gas and particle radiation, as is often encountered in the first few heaters in coal fired boilers and heat recovery steam generators. A more fundamental scaling law is applied for the convection scaling and incorporates a cleanliness factor which allows for the consideration of fouling of the heater surfaces. The model’s performance was validated against a discretized tube-level heater model that solves the fundamental convection and radiation terms. The model is accurate within 1% for the cases considered, as compared to more than 20% error if radiation contribution is not considered.
format	article
author	Fuls Wim
author_facet	Fuls Wim
author_sort	Fuls Wim
title	An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
title_short	An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
title_full	An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
title_fullStr	An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
title_full_unstemmed	An accurate lumped convective plus radiative heat exchanger model for performance-based modelling
title_sort	accurate lumped convective plus radiative heat exchanger model for performance-based modelling
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/89457e418ad3426aad0455ea60433046
work_keys_str_mv	AT fulswim anaccuratelumpedconvectiveplusradiativeheatexchangermodelforperformancebasedmodelling AT fulswim accuratelumpedconvectiveplusradiativeheatexchangermodelforperformancebasedmodelling
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An accurate lumped convective plus radiative heat exchanger model for performance-based modelling

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