Evaporation of water to the ambient air is generally a cost-effective solution to alleviate heat
\nstress but is also critically discussed due to its increasing effect on indoor humidity. The
\nobjectives of this study were to investigate the impact on indoor temperature, humidity, and
\nventilation rate using a high-pressure fogging system inside a mechanically ventilated research
\nfacility for fattening pigs. Data were sampled quasi-continuously throughout four fattening
\nperiods, including information on water consumption and energy use of the fogging system, as
\nwell as on the averageweight gain of the pigs. It was found that for the pigs, the positive effects
\nof the reduction of sensible indoor temperature exceeded the negative effects of the increased
\nhumidity, mirrored e.g. by a reductionof the temperature\u2013humidity index (alert situationswere
\nreduced from 15.5% to 0.8%) and an increased weight gain of the animals during hot summer
\nconditions. Main effects were achieved on days with mean daily outside temperatures above
\n14 1C, during which water consumption of the fogging system averaged 4.9 ld\u00021 pig\u00021.
\nThe evaporation characteristics, such as the evaporative fraction as well as the time
\nconstant for reaching a steady state, were evaluated using a transfer-functionmodel. Both were
\ninfluenced largely by temperature and saturation deficit. While the evaporative fraction was
\n100% during steady state and 63% of steady state was reached within 65 s during warm and dry
\nambient conditions (28 1C; 53% relative humidity RH), the evaporative fraction dropped to 89%
\nand 65% for moderate (21 1C; 69% RH) and cold\/humid (131C; 83% RH) indoor conditions,
\nrespectively, and the time to reach steady state was nearly doubled for the latter. The
\ninformation about such evaporation characteristics is crucial for an accurate control of fogging
\nand ventilation.<\/p>\n","protected":false},"excerpt":{"rendered":"
Evaporation of water to the ambient air is generally a cost-effective solution to alleviate heat stress but is also critically discussed due to its increasing effect on indoor humidity. The objectives of this study were to investigate the impact on indoor temperature, humidity, and ventilation rate using a high-pressure fogging system inside a mechanically ventilated […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[8882,640,10033,1972,2519,332,6784,190,27278,497,1925,768,2851,7904,5879,5604,15468,20007,269,1806,20792,9821,15459,14,33,16262,14980,110,4644,19987,20911,4874,99,6053,274,69,945,1301],"class_list":["post-2060","post","type-post","status-publish","format-standard","hentry","category-environment","tag-al","tag-animal","tag-arc","tag-condition","tag-cool","tag-cooling","tag-cos","tag-cost","tag-energy","tag-energy-use","tag-evaporation","tag-experiment","tag-fat","tag-fattening","tag-fog","tag-fogging","tag-fogging-system","tag-gh","tag-heat","tag-humidity","tag-influence","tag-manure-evaporation","tag-ped","tag-pig","tag-pigs","tag-pl","tag-search","tag-stress","tag-summer","tag-swine-fogging-cooling","tag-t","tag-tan","tag-temperature","tag-use","tag-ventilation","tag-water","tag-water-consumption","tag-weight"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/2060","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=2060"}],"version-history":[{"count":0,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/2060\/revisions"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=2060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=2060"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=2060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}