Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof
Indoor solar-heating systems that use ventilated roofs have drawn attention in recent years. The effectiveness and efficiency of such air-heating systems vary depending on the design and operation methods. In Japan, by introducing outside air into a ventilated roof cavity and circulating the air ind...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/6/1606 |
| _version_ | 1797541433904726016 |
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| author | Haksung Lee Akihito Ozaki Younhee Choi Muhammad Iqbal |
| author_facet | Haksung Lee Akihito Ozaki Younhee Choi Muhammad Iqbal |
| author_sort | Haksung Lee |
| collection | DOAJ |
| description | Indoor solar-heating systems that use ventilated roofs have drawn attention in recent years. The effectiveness and efficiency of such air-heating systems vary depending on the design and operation methods. In Japan, by introducing outside air into a ventilated roof cavity and circulating the air indoors, systems that simultaneously obtain ventilation, solar heating, and heat-storage effects have been actively developed. The conventional systems intake a large volume of outside air to increase the solar heat collection effect. However, there is a risk of heat loss and over-drying when a large amount of cold dry air during winter is introduced. In this paper, plans are presented for improving these solar heating and heat-storage effects by preventing over-drying using indoor air circulation via ventilated cavities in the roof and indoor wall. By comparing the results of the proposed system with those of the conventional system via numerical simulation, the heating load is found to be reduced by 50% or more by circulating indoor air to the ventilated roof and storing the heat in the indoor wall. Moreover, an increased relative humidity of approximately 10% was confirmed by reducing the intrusion of the outside air and keeping the moisture indoors. |
| first_indexed | 2024-03-10T13:15:57Z |
| format | Article |
| id | doaj.art-e97ef3d90d1d4f9a975d08784723f5d7 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:15:57Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-e97ef3d90d1d4f9a975d08784723f5d72023-11-21T10:26:12ZengMDPI AGEnergies1996-10732021-03-01146160610.3390/en14061606Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of RoofHaksung Lee0Akihito Ozaki1Younhee Choi2Muhammad Iqbal3Faculty of Human-Environment Studies, Kyushu University, Fukuoka 819-0395, JapanFaculty of Human-Environment Studies, Kyushu University, Fukuoka 819-0395, JapanFaculty of Human-Environment Studies, Kyushu University, Fukuoka 819-0395, JapanGraduate School of Human-Environment Studies, Kyushu University, Fukuoka 819-0395, JapanIndoor solar-heating systems that use ventilated roofs have drawn attention in recent years. The effectiveness and efficiency of such air-heating systems vary depending on the design and operation methods. In Japan, by introducing outside air into a ventilated roof cavity and circulating the air indoors, systems that simultaneously obtain ventilation, solar heating, and heat-storage effects have been actively developed. The conventional systems intake a large volume of outside air to increase the solar heat collection effect. However, there is a risk of heat loss and over-drying when a large amount of cold dry air during winter is introduced. In this paper, plans are presented for improving these solar heating and heat-storage effects by preventing over-drying using indoor air circulation via ventilated cavities in the roof and indoor wall. By comparing the results of the proposed system with those of the conventional system via numerical simulation, the heating load is found to be reduced by 50% or more by circulating indoor air to the ventilated roof and storing the heat in the indoor wall. Moreover, an increased relative humidity of approximately 10% was confirmed by reducing the intrusion of the outside air and keeping the moisture indoors.https://www.mdpi.com/1996-1073/14/6/1606air circulationsolar-heat storageventilated solar roofhygrothermal control |
| spellingShingle | Haksung Lee Akihito Ozaki Younhee Choi Muhammad Iqbal Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof Energies air circulation solar-heat storage ventilated solar roof hygrothermal control |
| title | Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof |
| title_full | Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof |
| title_fullStr | Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof |
| title_full_unstemmed | Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof |
| title_short | Performance Improvement Plan of Air Circulation-Type Solar Heat-Storage System Using Ventilated Cavity of Roof |
| title_sort | performance improvement plan of air circulation type solar heat storage system using ventilated cavity of roof |
| topic | air circulation solar-heat storage ventilated solar roof hygrothermal control |
| url | https://www.mdpi.com/1996-1073/14/6/1606 |
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