Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications

In the present article, the heat transfer and fluid flow of the air in a compact microchannel gas heater (MCGH) was experimentally quantified. To understand the effect of heat flux value (HFV), and inlet velocity on the heat transfer coefficient (HTC), wall temperature, friction factor, Nusselt numb...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Bo Yang, Mohammad Mohsen Sarafraz, Maziar Arjomandi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	convective heat transfer solar receiver microchannel thermal performance Technology T
Acceso en línea:	https://doaj.org/article/345bf359475c4bfea0dbcc3bbb6782ce
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:345bf359475c4bfea0dbcc3bbb6782ce
record_format	dspace
spelling	oai:doaj.org-article:345bf359475c4bfea0dbcc3bbb6782ce2021-11-25T17:27:23ZThermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications10.3390/en142276251996-1073https://doaj.org/article/345bf359475c4bfea0dbcc3bbb6782ce2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7625https://doaj.org/toc/1996-1073In the present article, the heat transfer and fluid flow of the air in a compact microchannel gas heater (MCGH) was experimentally quantified. To understand the effect of heat flux value (HFV), and inlet velocity on the heat transfer coefficient (HTC), wall temperature, friction factor, Nusselt number, average pressure-drop value (PDV) and performance index (PI), a microchannel gas heater was constructed and tested with pressurized air. The results showed that the HTC was 20 W/(sqmK) to 70 W/(sqmK), corresponding to inlet velocities 6.7 m/s and 16.7 m/s, respectively within HFV < 1 kW/m<sup>2</sup>. Also, the highest PI was 1.19 meaning that the HT rate can be increased by 19% at u = 15 m/s in comparison with the reference case (at u = 13.3 m/s). Likewise, the HTC was intensified once the inlet velocity is increased. It was also identified that increasing the HFV has a strong effect on wall temperature, however, slightly changes the HTC. By increasing the heat flux value from 200 W/sqm to 1000 W/sqm, the HTC increased only by 4.7% which was associated with the poor thermophysical properties of air flowing inside MCGH. Two main mechanisms of wall slip and viscous heating were identified as main contributors to the heat transfer enhancement in MCGH.Bo YangMohammad Mohsen SarafrazMaziar ArjomandiMDPI AGarticleconvective heat transfersolar receivermicrochannelthermal performanceTechnologyTENEnergies, Vol 14, Iss 7625, p 7625 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	convective heat transfer solar receiver microchannel thermal performance Technology T
spellingShingle	convective heat transfer solar receiver microchannel thermal performance Technology T Bo Yang Mohammad Mohsen Sarafraz Maziar Arjomandi Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
description	In the present article, the heat transfer and fluid flow of the air in a compact microchannel gas heater (MCGH) was experimentally quantified. To understand the effect of heat flux value (HFV), and inlet velocity on the heat transfer coefficient (HTC), wall temperature, friction factor, Nusselt number, average pressure-drop value (PDV) and performance index (PI), a microchannel gas heater was constructed and tested with pressurized air. The results showed that the HTC was 20 W/(sqmK) to 70 W/(sqmK), corresponding to inlet velocities 6.7 m/s and 16.7 m/s, respectively within HFV < 1 kW/m<sup>2</sup>. Also, the highest PI was 1.19 meaning that the HT rate can be increased by 19% at u = 15 m/s in comparison with the reference case (at u = 13.3 m/s). Likewise, the HTC was intensified once the inlet velocity is increased. It was also identified that increasing the HFV has a strong effect on wall temperature, however, slightly changes the HTC. By increasing the heat flux value from 200 W/sqm to 1000 W/sqm, the HTC increased only by 4.7% which was associated with the poor thermophysical properties of air flowing inside MCGH. Two main mechanisms of wall slip and viscous heating were identified as main contributors to the heat transfer enhancement in MCGH.
format	article
author	Bo Yang Mohammad Mohsen Sarafraz Maziar Arjomandi
author_facet	Bo Yang Mohammad Mohsen Sarafraz Maziar Arjomandi
author_sort	Bo Yang
title	Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
title_short	Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
title_full	Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
title_fullStr	Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
title_full_unstemmed	Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications
title_sort	thermal performance characteristics of a microchannel gas heater for solar heating applications
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/345bf359475c4bfea0dbcc3bbb6782ce
work_keys_str_mv	AT boyang thermalperformancecharacteristicsofamicrochannelgasheaterforsolarheatingapplications AT mohammadmohsensarafraz thermalperformancecharacteristicsofamicrochannelgasheaterforsolarheatingapplications AT maziararjomandi thermalperformancecharacteristicsofamicrochannelgasheaterforsolarheatingapplications
_version_	1718412343204904960

Thermal Performance Characteristics of a Microchannel Gas Heater for Solar Heating Applications

Ejemplares similares