Improving Skylight Geometry for Daytime Passive Radiative Cooling

Gopalakrishna Gangisetty; Kennet Tallgren; Cornelis A P Zevenhoven

doi:10.1007/978-3-031-67241-5_24

Improving Skylight Geometry for Daytime Passive Radiative Cooling

Gopalakrishna Gangisetty^*, Kennet Tallgren, Cornelis A P Zevenhoven

^*Corresponding author for this work

Research output: Chapter in Book/Conference proceeding › Published conference proceeding › Scientific › peer-review

43 Downloads (Pure)

Abstract

Åbo Akademi University (ÅAU) is researching a passive radiative cooling (PRC) skylight window prototype utilizing greenhouse gases (GHGs) that interact strongly with thermal radiation. The first prototype achieved 100 W/m2 passive cooling using two ZnS windows, one at the bottom and one at the top, both transparent to long-wave (LW) infrared, and a central window. The aim of this ongoing work is to improve the skylight design by utilizing computational fluid dynamics (CFD) software (Ansys Fluent). The objective of this design improvement is to eliminate the usage of central window used in the earlier design. In this improved design, sections of ZnS glass are positioned symmetrically, at the top and at the bottom. The remaining window is composed of conventional window glass, while the side walls are made of wood. Another objective entails using various greenhouse gases, such as CO2 and NH3, inside the skylight and subsequently calculating the transmittive radiative fluxes within the atmospheric window (8–14 μm) wavelength range, followed by a comparative analysis with using air. Thus far, the radiative heat fluxes achieved with the new skylight design are as follows: 85.5 W/m2 when CO2 is used as the participating medium, 83.0 W/m2 with air, and 88.5 W/m2 when NH3 is used. Additionally, temperatures of the ZnS Cleartran glasses give a calculated lowering of approximately 3 to 4 ℃ in comparison to the ambient temperature. The ultimate aim is to develop a transparent PRC skylight with a net cooling capacity >> 100 W/m2 without moving parts also during daytime.

Original language	English
Title of host publication	Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023
Subtitle of host publication	Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1
Editors	Ali Cemal Benim, Rachid Bennacer, Abdulmajeed A. Mohamad, Paweł Ocłoń, Jan Taler, Sang-Ho Suh
Publisher	Springer
Pages	265-276
Number of pages	12
ISBN (Electronic)	978-3-031-67241-5
ISBN (Print)	978-3-031-67241-5, 978-3-031-67240-8
DOIs	https://doi.org/10.1007/978-3-031-67241-5_24
Publication status	Published - 31 Aug 2024
MoE publication type	A4 Article in a conference publication
Event	14th International Conference on Computational Heat and Mass Transfer - Düsseldorf, Germany Duration: 4 Sept 2023 → 8 Sept 2023 Conference number: 14 https://www.icchmt2023.de/

Publication series

Name	Lecture Notes in Mechanical Engineering
ISSN (Print)	2195-4356
ISSN (Electronic)	2195-4364

Conference

Conference	14th International Conference on Computational Heat and Mass Transfer
Abbreviated title	ICCHMT 2023
Country/Territory	Germany
City	Düsseldorf
Period	04/09/23 → 08/09/23
Internet address	https://www.icchmt2023.de/

Keywords

passive cooling
skylight
CFD

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/978-3-031-67241-5_24

Cite this

Gangisetty, G., Tallgren, K., & Zevenhoven, C. A. P. (2024). Improving Skylight Geometry for Daytime Passive Radiative Cooling. In A. C. Benim, R. Bennacer, A. A. Mohamad, P. Ocłoń, J. Taler, & S.-H. Suh (Eds.), Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1 (pp. 265-276). (Lecture Notes in Mechanical Engineering). Springer. https://doi.org/10.1007/978-3-031-67241-5_24

Gangisetty, Gopalakrishna ; Tallgren, Kennet ; Zevenhoven, Cornelis A P. / Improving Skylight Geometry for Daytime Passive Radiative Cooling. Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1. editor / Ali Cemal Benim ; Rachid Bennacer ; Abdulmajeed A. Mohamad ; Paweł Ocłoń ; Jan Taler ; Sang-Ho Suh. Springer, 2024. pp. 265-276 (Lecture Notes in Mechanical Engineering).

@inproceedings{ebe0fbbbd7c049f4ad07ace0701e171f,

title = "Improving Skylight Geometry for Daytime Passive Radiative Cooling",

abstract = "{\AA}bo Akademi University ({\AA}AU) is researching a passive radiative cooling (PRC) skylight window prototype utilizing greenhouse gases (GHGs) that interact strongly with thermal radiation. The first prototype achieved 100 W/m2 passive cooling using two ZnS windows, one at the bottom and one at the top, both transparent to long-wave (LW) infrared, and a central window. The aim of this ongoing work is to improve the skylight design by utilizing computational fluid dynamics (CFD) software (Ansys Fluent). The objective of this design improvement is to eliminate the usage of central window used in the earlier design. In this improved design, sections of ZnS glass are positioned symmetrically, at the top and at the bottom. The remaining window is composed of conventional window glass, while the side walls are made of wood. Another objective entails using various greenhouse gases, such as CO2 and NH3, inside the skylight and subsequently calculating the transmittive radiative fluxes within the atmospheric window (8–14 μm) wavelength range, followed by a comparative analysis with using air. Thus far, the radiative heat fluxes achieved with the new skylight design are as follows: 85.5 W/m2 when CO2 is used as the participating medium, 83.0 W/m2 with air, and 88.5 W/m2 when NH3 is used. Additionally, temperatures of the ZnS Cleartran glasses give a calculated lowering of approximately 3 to 4 ℃ in comparison to the ambient temperature. The ultimate aim is to develop a transparent PRC skylight with a net cooling capacity >> 100 W/m2 without moving parts also during daytime.",

keywords = "passive cooling, skylight, CFD",

author = "Gopalakrishna Gangisetty and Kennet Tallgren and Zevenhoven, {Cornelis A P}",

year = "2024",

month = aug,

day = "31",

doi = "10.1007/978-3-031-67241-5_24",

language = "English",

isbn = "978-3-031-67241-5",

series = "Lecture Notes in Mechanical Engineering",

publisher = "Springer",

pages = "265--276",

editor = "Benim, {Ali Cemal} and Rachid Bennacer and Mohamad, {Abdulmajeed A.} and Pawe{\l} Oc{\l}o{\'n} and Jan Taler and Sang-Ho Suh",

booktitle = "Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023",

note = "14th International Conference on Computational Heat and Mass Transfer, ICCHMT 2023 ; Conference date: 04-09-2023 Through 08-09-2023",

url = "https://www.icchmt2023.de/",

}

Gangisetty, G , Tallgren, K & Zevenhoven, CAP 2024, Improving Skylight Geometry for Daytime Passive Radiative Cooling. in AC Benim, R Bennacer, AA Mohamad, P Ocłoń, J Taler & S-H Suh (eds), Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1. Lecture Notes in Mechanical Engineering, Springer, pp. 265-276, 14th International Conference on Computational Heat and Mass Transfer, Düsseldorf, Germany, 04/09/23. https://doi.org/10.1007/978-3-031-67241-5_24

Improving Skylight Geometry for Daytime Passive Radiative Cooling. / Gangisetty, Gopalakrishna ; Tallgren, Kennet ; Zevenhoven, Cornelis A P.
Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1. ed. / Ali Cemal Benim; Rachid Bennacer; Abdulmajeed A. Mohamad; Paweł Ocłoń; Jan Taler; Sang-Ho Suh. Springer, 2024. p. 265-276 (Lecture Notes in Mechanical Engineering).

Research output: Chapter in Book/Conference proceeding › Published conference proceeding › Scientific › peer-review

TY - GEN

T1 - Improving Skylight Geometry for Daytime Passive Radiative Cooling

AU - Gangisetty, Gopalakrishna

AU - Tallgren, Kennet

AU - Zevenhoven, Cornelis A P

N1 - Conference code: 14

PY - 2024/8/31

Y1 - 2024/8/31

N2 - Åbo Akademi University (ÅAU) is researching a passive radiative cooling (PRC) skylight window prototype utilizing greenhouse gases (GHGs) that interact strongly with thermal radiation. The first prototype achieved 100 W/m2 passive cooling using two ZnS windows, one at the bottom and one at the top, both transparent to long-wave (LW) infrared, and a central window. The aim of this ongoing work is to improve the skylight design by utilizing computational fluid dynamics (CFD) software (Ansys Fluent). The objective of this design improvement is to eliminate the usage of central window used in the earlier design. In this improved design, sections of ZnS glass are positioned symmetrically, at the top and at the bottom. The remaining window is composed of conventional window glass, while the side walls are made of wood. Another objective entails using various greenhouse gases, such as CO2 and NH3, inside the skylight and subsequently calculating the transmittive radiative fluxes within the atmospheric window (8–14 μm) wavelength range, followed by a comparative analysis with using air. Thus far, the radiative heat fluxes achieved with the new skylight design are as follows: 85.5 W/m2 when CO2 is used as the participating medium, 83.0 W/m2 with air, and 88.5 W/m2 when NH3 is used. Additionally, temperatures of the ZnS Cleartran glasses give a calculated lowering of approximately 3 to 4 ℃ in comparison to the ambient temperature. The ultimate aim is to develop a transparent PRC skylight with a net cooling capacity >> 100 W/m2 without moving parts also during daytime.

AB - Åbo Akademi University (ÅAU) is researching a passive radiative cooling (PRC) skylight window prototype utilizing greenhouse gases (GHGs) that interact strongly with thermal radiation. The first prototype achieved 100 W/m2 passive cooling using two ZnS windows, one at the bottom and one at the top, both transparent to long-wave (LW) infrared, and a central window. The aim of this ongoing work is to improve the skylight design by utilizing computational fluid dynamics (CFD) software (Ansys Fluent). The objective of this design improvement is to eliminate the usage of central window used in the earlier design. In this improved design, sections of ZnS glass are positioned symmetrically, at the top and at the bottom. The remaining window is composed of conventional window glass, while the side walls are made of wood. Another objective entails using various greenhouse gases, such as CO2 and NH3, inside the skylight and subsequently calculating the transmittive radiative fluxes within the atmospheric window (8–14 μm) wavelength range, followed by a comparative analysis with using air. Thus far, the radiative heat fluxes achieved with the new skylight design are as follows: 85.5 W/m2 when CO2 is used as the participating medium, 83.0 W/m2 with air, and 88.5 W/m2 when NH3 is used. Additionally, temperatures of the ZnS Cleartran glasses give a calculated lowering of approximately 3 to 4 ℃ in comparison to the ambient temperature. The ultimate aim is to develop a transparent PRC skylight with a net cooling capacity >> 100 W/m2 without moving parts also during daytime.

KW - passive cooling

KW - skylight

KW - CFD

U2 - 10.1007/978-3-031-67241-5_24

DO - 10.1007/978-3-031-67241-5_24

M3 - Published conference proceeding

SN - 978-3-031-67241-5

SN - 978-3-031-67240-8

T3 - Lecture Notes in Mechanical Engineering

SP - 265

EP - 276

BT - Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023

A2 - Benim, Ali Cemal

A2 - Bennacer, Rachid

A2 - Mohamad, Abdulmajeed A.

A2 - Ocłoń, Paweł

A2 - Taler, Jan

A2 - Suh, Sang-Ho

PB - Springer

T2 - 14th International Conference on Computational Heat and Mass Transfer

Y2 - 4 September 2023 through 8 September 2023

ER -

Gangisetty G , Tallgren K , Zevenhoven CAP. Improving Skylight Geometry for Daytime Passive Radiative Cooling. In Benim AC, Bennacer R, Mohamad AA, Ocłoń P, Taler J, Suh SH, editors, Advances in Computational Heat and Mass Transfer - Proceedings of the 14th International Conference on Computational Heat and Mass Transfer ICCHMT 2023: Proceedings of the 14th International Conference on Computational Heat and Mass Transfer (ICCHMT 2023), 4-8 September, 2023, Düsseldorf, Germany, Volume 1. Springer. 2024. p. 265-276. (Lecture Notes in Mechanical Engineering). doi: 10.1007/978-3-031-67241-5_24

Improving Skylight Geometry for Daytime Passive Radiative Cooling

Abstract

Publication series

Conference

Keywords

UN SDGs

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