干旱区生态环境知识资源中心(Arid): Intrinsic Evaporative Cooling by Hygroscopic Earth Materials

Arid

DOI	10.3390/geosciences6030038
	Intrinsic Evaporative Cooling by Hygroscopic Earth Materials
	Rempel, Alexandra R.; Rempel, Alan W.
通讯作者	Rempel, AR
来源期刊	GEOSCIENCES
EISSN	2076-3263
出版年	2016
卷号	6 期号:3
英文摘要	The phase change of water from liquid to vapor is one of the most energy-intensive physical processes in nature, giving it immense potential for cooling. Diverse evaporative cooling strategies have resulted worldwide, including roof ponds and sprinklers, courtyard fountains, wind catchers with qanats, irrigated green roofs, and fan-assisted evaporative coolers. These methods all require water in bulk liquid form. The evaporation of moisture that has been sorbed from the atmosphere by hygroscopic materials is equally energy-intensive, however, yet has not been examined for its cooling potential. In arid and semi-arid climates, hygroscopic earth buildings occur widely and are known to maintain comfortable indoor temperatures, but evaporation of moisture from their walls and roofs has been regarded as unimportant since water scarcity limits irrigation and rainfall; instead, their cool interiors are attributed to well-established mass effects in delaying the transmission of sensible gains. Here, we investigate the cooling accomplished by daily cycles of moisture sorption and evaporation which, requiring only ambient humidity, we designate as "intrinsic" evaporative cooling. Connecting recent soil science to heat and moisture transport studies in building materials, we use soils, adobe, cob, unfired earth bricks, rammed earth, and limestone to reveal the effects of numerous parameters (temperature and relative humidity, material orientation, thickness, moisture retention properties, vapor diffusion resistance, and liquid transport properties) on the magnitude of intrinsic evaporative cooling and the stabilization of indoor relative humidity. We further synthesize these effects into concrete design guidance. Together, these results show that earth buildings in diverse climates have significant potential to cool themselves evaporatively through sorption of moisture from humid night air and evaporation during the following day's heat. This finding challenges the perception of limited evaporative cooling resources in arid climates and greatly expands the applicability of evaporative cooling in contemporary buildings to water-stressed regions.
英文关键词	evaporative cooling hygroscopic materials coupled heat and moisture transfer passive cooling earth buildings indoor humidity buffering adobe cob rammed earth thermal mass
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000410148000008
WOS关键词	PARTICLE-SIZE DISTRIBUTION ; RAMMED EARTH ; VERNACULAR ARCHITECTURE ; HYDRAULIC CONDUCTIVITY ; MOISTURE INGRESS ; WATER-RETENTION ; EMBODIED ENERGY ; SOIL ; BUILDINGS ; CONSTRUCTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/331903
作者单位	[Rempel, Alexandra R.] Univ Oregon, Environm Studies Program, 1585 E 13th Ave, Eugene, OR 97403 USA; [Rempel, Alan W.] Univ Oregon, Dept Geol Sci, 1275 E 13th Ave, Eugene, OR 97403 USA
推荐引用方式 GB/T 7714	Rempel, Alexandra R.,Rempel, Alan W.. Intrinsic Evaporative Cooling by Hygroscopic Earth Materials[J],2016,6(3).
APA	Rempel, Alexandra R.,&Rempel, Alan W..(2016).Intrinsic Evaporative Cooling by Hygroscopic Earth Materials.GEOSCIENCES,6(3).
MLA	Rempel, Alexandra R.,et al."Intrinsic Evaporative Cooling by Hygroscopic Earth Materials".GEOSCIENCES 6.3(2016).