Optimized cool roofs: Integrating albedo and thermal emittance with R-value. Gentle, A. R., Aguilar, J. L. C., & Smith, G. B. Solar Energy Materials and Solar Cells, 95(12):3207–3215, December, 2011. ![Optimized cool roofs: Integrating albedo and thermal emittance with R-value [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex For cool roofs the combined effect of the three parameters that define heat gain and loss from a roof, namely solar albedo α, thermal emittance E, and sub-roof R-value, must be considered. An accurate contribution of night sky cooling, and hence humidity and total down-welling atmospheric radiation is needed. A systematic analysis of the contribution of a roof to average cooling load per day and to peak load reductions is presented for a temperate climate zone over 6 cooling months using an hour-by-hour analysis. Eighteen 3-parameter sets (α,E,R) demonstrate the over-riding importance of a high α, while sensitivity to R-value and E drops away as albedo rises. Up-front cost per unit reductions in peak demand or average energy use per day always rises strongly as R rises unless albedo is low. A moderate R∼1.63 is superior to high R unless a roof is dark, or winter heating demand is high. We indicate briefly why the roof typically does not present a dominant influence on average winter heating needs in most temperate zones, enhancing the benefits of cool roofs.
@article{gentle_optimized_2011,
title = {Optimized cool roofs: {Integrating} albedo and thermal emittance with {R}-value},
volume = {95},
issn = {0927-0248},
shorttitle = {Optimized cool roofs},
url = {http://www.sciencedirect.com/science/article/pii/S0927024811004211},
doi = {10.1016/j.solmat.2011.07.018},
abstract = {For cool roofs the combined effect of the three parameters that define heat gain and loss from a roof, namely solar albedo α, thermal emittance E, and sub-roof R-value, must be considered. An accurate contribution of night sky cooling, and hence humidity and total down-welling atmospheric radiation is needed. A systematic analysis of the contribution of a roof to average cooling load per day and to peak load reductions is presented for a temperate climate zone over 6 cooling months using an hour-by-hour analysis. Eighteen 3-parameter sets (α,E,R) demonstrate the over-riding importance of a high α, while sensitivity to R-value and E drops away as albedo rises. Up-front cost per unit reductions in peak demand or average energy use per day always rises strongly as R rises unless albedo is low. A moderate R∼1.63 is superior to high R unless a roof is dark, or winter heating demand is high. We indicate briefly why the roof typically does not present a dominant influence on average winter heating needs in most temperate zones, enhancing the benefits of cool roofs.},
language = {en},
number = {12},
urldate = {2020-07-13},
journal = {Solar Energy Materials and Solar Cells},
author = {Gentle, A. R. and Aguilar, J. L. C. and Smith, G. B.},
month = dec,
year = {2011},
keywords = {-value, Albedo, Cool roof, Cooling load, Cost benefits, Peak demand},
pages = {3207--3215},
}
Downloads: 0
{"_id":"tiLpekenCTcchoNoC","bibbaseid":"gentle-aguilar-smith-optimizedcoolroofsintegratingalbedoandthermalemittancewithrvalue-2011","author_short":["Gentle, A. R.","Aguilar, J. L. C.","Smith, G. B."],"bibdata":{"bibtype":"article","type":"article","title":"Optimized cool roofs: Integrating albedo and thermal emittance with R-value","volume":"95","issn":"0927-0248","shorttitle":"Optimized cool roofs","url":"http://www.sciencedirect.com/science/article/pii/S0927024811004211","doi":"10.1016/j.solmat.2011.07.018","abstract":"For cool roofs the combined effect of the three parameters that define heat gain and loss from a roof, namely solar albedo α, thermal emittance E, and sub-roof R-value, must be considered. An accurate contribution of night sky cooling, and hence humidity and total down-welling atmospheric radiation is needed. A systematic analysis of the contribution of a roof to average cooling load per day and to peak load reductions is presented for a temperate climate zone over 6 cooling months using an hour-by-hour analysis. Eighteen 3-parameter sets (α,E,R) demonstrate the over-riding importance of a high α, while sensitivity to R-value and E drops away as albedo rises. Up-front cost per unit reductions in peak demand or average energy use per day always rises strongly as R rises unless albedo is low. A moderate R∼1.63 is superior to high R unless a roof is dark, or winter heating demand is high. We indicate briefly why the roof typically does not present a dominant influence on average winter heating needs in most temperate zones, enhancing the benefits of cool roofs.","language":"en","number":"12","urldate":"2020-07-13","journal":"Solar Energy Materials and Solar Cells","author":[{"propositions":[],"lastnames":["Gentle"],"firstnames":["A.","R."],"suffixes":[]},{"propositions":[],"lastnames":["Aguilar"],"firstnames":["J.","L.","C."],"suffixes":[]},{"propositions":[],"lastnames":["Smith"],"firstnames":["G.","B."],"suffixes":[]}],"month":"December","year":"2011","keywords":"-value, Albedo, Cool roof, Cooling load, Cost benefits, Peak demand","pages":"3207–3215","bibtex":"@article{gentle_optimized_2011,\n\ttitle = {Optimized cool roofs: {Integrating} albedo and thermal emittance with {R}-value},\n\tvolume = {95},\n\tissn = {0927-0248},\n\tshorttitle = {Optimized cool roofs},\n\turl = {http://www.sciencedirect.com/science/article/pii/S0927024811004211},\n\tdoi = {10.1016/j.solmat.2011.07.018},\n\tabstract = {For cool roofs the combined effect of the three parameters that define heat gain and loss from a roof, namely solar albedo α, thermal emittance E, and sub-roof R-value, must be considered. An accurate contribution of night sky cooling, and hence humidity and total down-welling atmospheric radiation is needed. A systematic analysis of the contribution of a roof to average cooling load per day and to peak load reductions is presented for a temperate climate zone over 6 cooling months using an hour-by-hour analysis. Eighteen 3-parameter sets (α,E,R) demonstrate the over-riding importance of a high α, while sensitivity to R-value and E drops away as albedo rises. Up-front cost per unit reductions in peak demand or average energy use per day always rises strongly as R rises unless albedo is low. A moderate R∼1.63 is superior to high R unless a roof is dark, or winter heating demand is high. We indicate briefly why the roof typically does not present a dominant influence on average winter heating needs in most temperate zones, enhancing the benefits of cool roofs.},\n\tlanguage = {en},\n\tnumber = {12},\n\turldate = {2020-07-13},\n\tjournal = {Solar Energy Materials and Solar Cells},\n\tauthor = {Gentle, A. R. and Aguilar, J. L. C. and Smith, G. B.},\n\tmonth = dec,\n\tyear = {2011},\n\tkeywords = {-value, Albedo, Cool roof, Cooling load, Cost benefits, Peak demand},\n\tpages = {3207--3215},\n}\n\n","author_short":["Gentle, A. R.","Aguilar, J. L. C.","Smith, G. B."],"key":"gentle_optimized_2011","id":"gentle_optimized_2011","bibbaseid":"gentle-aguilar-smith-optimizedcoolroofsintegratingalbedoandthermalemittancewithrvalue-2011","role":"author","urls":{"Paper":"http://www.sciencedirect.com/science/article/pii/S0927024811004211"},"keyword":["-value","Albedo","Cool roof","Cooling load","Cost benefits","Peak demand"],"metadata":{"authorlinks":{}},"html":""},"bibtype":"article","biburl":"https://bibbase.org/zotero/zhuangcq","dataSources":["nLnfxLGHByacJX44C"],"keywords":["-value","albedo","cool roof","cooling load","cost benefits","peak demand"],"search_terms":["optimized","cool","roofs","integrating","albedo","thermal","emittance","value","gentle","aguilar","smith"],"title":"Optimized cool roofs: Integrating albedo and thermal emittance with R-value","year":2011}