The Study of Indoor Air Thermal Environment and Energy in Winter

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1 010 The Seco Chia Eergy Scieis Forum The Suy of Ioor Air Thermal Eirome a Eergy i Wier Zhoghua Tag College of Archiecure a Ciil Egieerig, Souhwes Uiersiy of Sciece a Techology Miayag Chia agzhoghua@16.com Absrac: The paper escribe a experime i he ioor air lab i SWUST (The Souhwes Uiersiy of Sciece a Techology), i is presume he lab as a office a measure he aa accorig o he fucio of he room. I he scale experimes, Measure he i-oor air emperaure, relaiely humiiy a humiiy raio, air elociy a eergy cosumpio i iffere air coiio. Suies he air isribuio a uiformiy i he room a calculaes he PMV iex. Keywors: Temperaure Humiiy;he elociy of wi;he olume of ; PMV;he eergy cosumpio 1. Iroucio The paper combie wih climaic characerisics i orher Sichua, he crow feaures a air isribuio. This paper aalyses he law of hermal eirome a he law of eergy cosumpio wih iffere air supply coiios i spli air-coiioe room i wier. Proie a referece for fuure esig of HVAC.I paricular, proiig a basis for he user o isall he sub-boy coiioig more cosierable. A proie he heoreical suppor for he researchers o selec he appropriae eergy cosumpio simulaio meho. A emphasis he air isribuio impac o he ioor hermal eirome. I s ecessary o use he research of ioor hermal eirome oo he egieerig.. Experimeal preparaio.1. Tes room Experimeal es room 3 meers log a 3 meers wie has a area of 9 square meers, (Figure 1) a.5 meers heigh. Eas opee a 100mm 190mm oor. There is a 1400mm 1700mm ouble wiow i Norh wall. Wall for he δ = 40mm of masory srucure. Brush ceme morar boh isie a ousie layer. The lower par of he es room has a mm exhaus uc... The uc of iepee The laboraory has a uc( mm) for he iepee, mechaical eilaio, air pahs wih a cerifugal fa a hree muli-leaf off ales. The supply o he heigh of.5m a he olume is 50 ~ 00m3 / h. The cocree measures show i Figure:.3. Aalysis This subjec ess by experimeal mehos. Tes he emperaure fiel humiiy fiel, wi, a he raiaio emperaure of he wall i iffere supply/exhaus way. The aalyze he experimeal resuls obaie he bes way of supply air. Sole he uequal egree wih he emperaure fiel, wi a humiiy fiel. Usig uequal coefficie meho [4] o aalyze, i eails: Selec measurig pois, measure (or calculae) poi emperaure, wi a humiiy raios, fi he arihmeic mea of he absolue alues is: i i i Roo mea square eiaio is: ( i ) ( i ) ( i ) 177

2 010 The Seco Chia Eergy Scieis Forum Uequal coefficie is: Obiously, he smaller,, smaller, he beer he uiformy. There are may ways for he ealuaio of hermal comfor. This suy aops he PMV-PPD iices from Fager professor (Techical Uiersiy of Demar) o ealuae. PMV is a hermal sesaio iex ge by comfor equaio. I will cosiue a hermal eirome wih hree ypes of ariables (air ry bulb emperaure, relaie humiiy a air flow rae of a cerai boy) composiio. Le he preicio eermie by aciiy leels a clohig for he aerage hermal sesaio (he aerage alue of see-poi from he hermal sesaio of es populaio) becomes possible. I ca be use o ealuae he hermal eirome from a geeral poi of iew..4. Iroucio of measure coe I orer o more accuraely ealuae he impac o he ioor hermal comfor for iffere air supply mehos. We es ioor air emperaure, humiiy a wi elociy fiel i iffere eer ways of. Oe ay, we ae hree represeaioal imes o measure, are 9:00 ~ 10:00, 13:00~14:00a17:00 ~ 18:00. We measure he isie a ousie emperaure, humiiy, a wi of each measurig poi i his hree imes. Specific es mehos a es air ae show i Table1. Table 1 air supply a es shee wih es ae Tesig ime Fresh air Tesig ime Fresh air small No i 0 low No i low 0 low small 130 uer large 90 uer large Exhaus air ouoor machie 130 irouce uer Exhaus air ouoor machie irouce uer low-elociy 65 Noe: The iroucio of is he.4m heigh place iepee iroucio way. The mix iroucio is mixes wih he air from he bellower mix a he se ou by he air-coiioer. Wih he ormal experimeal arrage. experimeal iroucio of shoul be 9 groups, bu ae hree mai ifluecig facors io cosiere: olume, ile a he air supply of air-coiioig ca be fixe leel. So i aops he orhogoal es meho. Oher s use he eire arrageme irouce experimeal meho. 3. Experimeal Aalysis I orer o pree he es resuls are ifluece by he chages of ouoor emperaure. The es chamber place isie he oor. Room emperaure chages a lile. Each ioor measurig poi emperaure bewee 11 ~ 1.5 wihou air-coiioig bu wiows ope, he aerage emperaure is 11.5 o Dec Temperaure fiel Disribuio I is well ow ha he ioor emperaure is ifluece by he olume a ouoor air emperaure chages. A supply is a 178

3 010 The Seco Chia Eergy Scieis Forum impora facor for he ioor emperaure chages. The ioor emperaure of hybri meho has smaller eirome emperaure ifferece a he emperaure isribuio more uiform ha he way of iepee supply. Wi elociy is a coiioig ruig parameer ca o be igore i wier. The bigger wi elociy, he shorer air mix ime a he ioor emperaure isribuios emperaure ifferece is small. For small wi elociy, he opposie is. So jus cosier he ioor emperaure coiios. The hybri meho wih large wi elociy is he bes air supply. The emperaure isribuios of hree imes are similar. Wih he coiuous exesio of air coiioig ime, he ioor emperaure ecreases, (Figure3). 3. Humiiy fiel isribuio Uer each i of air supply ioor humiiy fiel isribuio ery orerly. Wheher horizoal or erical surface relaie humiiy is almos uaimous, bu he relaie humiiy is ery iffere size. The relaie humiiy uiformiy coefficie has grealy ifferece. Wier ioor relaie humiiy a a comforable bewee 40% o 60% a he ioor humiiy fiel uiformiy is beer ha meas uiformiy coefficie less. Mixig large high, low- mixig small fresh, iepee o low- large wihou io he exhaus of high-, ouoor from owwar a fee bac from he iroucio of high, ejec air ouoor from owwar a fee bac from low is he way we choose. No fresh air supply of worse ioor air qualiy o use. The, accorig o he size of he uee coefficie, ca choose he bes air supply meho of relaie humiiy fiel. Exhaus air ouoor machie irouce uer low-elociy for opimal. Exhaus air ouoor machie irouce uer is seco, a he are iepee large, mixig small low, mixig large, (Figure 4). 3.3 Eergy Cosumpio Aalysis Ealuae he pros a cos of air coiioig sysem from wo aspecs. Oe is he comforable of he air-coiioe eirome, a seco, he eergy cosumpio of air coiioig sysems. Wih he cosa esio i he worl eergy siuaio, eergy coseraio has become oe of he worl's impora issues. Air coiioig eergy cosumpio i oay's builig eergy cosumpio ha he lise high. The eergy cosumpio of air coiioig sysem aalysis has proie a impora referece facor for our air coiioig esig. Aope here o air coiioig wih wiows ope as a referece, he room aerage emperaure is15.9. The ifferece air emperaure bewee oher air supply way a o air coiioig wiows ope is as follows Table. Aerage emperaure emperaure ifferece Table Compariso of ioor emperaure a emperaure ifferece low low uer high large small uer low 179

4 010 The Seco Chia Eergy Scieis Forum Aerage emperaure emperaure ifferece No i No i low small large from owwar i from owwar i low Accorig o he characerisics of he laboraory, he ioor es space, he small chages of ioor emperaure a he small hea exchage effec of ouoor ui s. Igore he ifluece of he i ouoor emperaure chages. Use he aerage emperaure i experimeal space as referece emperaure. A compare he alue of eergy cosumpio icrease 1 per. The aerage eergy cosumpio of a ariey of air meas he followig able3: Table3 The aerage emperaure isribuio pois Aerage eergy cosumpio KW Temperaure ifferece Ui of eergy cosumpio KW/ Aerage eergy cosumpio KW Temperaure ifferece Ui of eergy cosumpio KW/ low low fresh air uer large No i No i low small large o from owwar i small fresh air uer low from owwar i low 1) Accorig o hese experimes. We fi ha low of air supply ui eergy cosumpio is much larger ha high wi of air supply wihou ae he eergy cosumpio of io accou a espie he way of air supply/reur. ) The eergy cosumpio of shoul o be igore. The loa of is large. so i saisfies he ioor air qualiy i he siuaio o use he smalles olume i air coiioig esigs. Here s he comparaie es resuls cofirme he greaer he larger, he larger eergy cosumpio. 3) Wheher he air supply is mixig large fresh air wih a iepee air supply wih, mixig large i low a iepee air supply i low, or mixig small wih a iepee air supply i, mixig small i a iepee air supply i low. The eergy cosumpio of a mixure of io he room is lower ha a iepee. 4) For he experimeal air supply, he eergy compuaio of from owwar i high or from owwar i low wih ouoor machie a he oher meho is similar. Compare wih from owwar o low a iepeece large uer he low, iepeece small uer he low. The eergy compuaio is lile ifferece bewee he wo. 5) The eergy recoery o his air supply has o aaage, ee o as goo as oher s. Why will hae such a siuaio? Here we eglece a impora facor, which is he eergy compuaio of. Therefore, ee o aalyze he chage o for he eergy cosumpio. 4.Coclusio The resuls from he aalysis aboe, he ioor sae parameers are ifluece by may facors, such as: he 180

5 010 The Seco Chia Eergy Scieis Forum olume, supply a he wi elociy a so o. Ioor emperaure fiels, humiiy fiels, wi elociy fiels, eergy cosumpio aalysis a recommee air supply s, o ifficul o fi he relaioship bewee hem. Wier wi, he begiig of his paper has emphasize he ifluece of he ioor sae parameers. From he aalysis of emperaure fiel, he air supply wih mixig high elociy is he recommee. Humiiy fiels is a low- wih low wi-elociy, a wi-elociy fiels is a low-. Eergy cosumpio is aoher impora iicaor of air coiioig sysem, he requiremes of he wi is high. I seems ha huma comfor is coraice wih eergy cosumpio, i fac, air, eergy cosumpio a sae parameers ioors is also icompaible. Oe is low wi, he oher is he high wi, he wo cures ceraily hae a crossig poi, a his poi jus is he ecoomic flow. I orer o maiai ioor parameers, he ecoomic reuce eergy cosumpio. The ecoomy is raise i a whole space boy, o a sigle poi. Opimum air coiioig sysem, he raioal selecio of air supply saus pois. Refereces [1] SuWeihog, base o o-uiform coefficie of waer eiromeal capaciy calculaio meho, his paper probes io he proecio of waer resources, 001. [J]. (6) : [] YaQise, ShiWeXig, TiaChagQig ec. Air coiioig wih refrigeraio echology [j]. Chia archiecure &builig press, [3] ZhagHogliag, LiuJiPig. Househol ierer air coiio col loa aalysis a eergy-saig. Hac [J], 003,33 (6) : [4] LiuYami [], HuagPig. Splis he ioor eirome wih air. Hac [J], 004,34 (3) : [5] ShouHuihui, YaoGuoQi. Househol ceral air coiioer sysem esig a egieerig examples [M]. Sciece press,