... = ρi. Tmin. Tmax. 1. Time Lag 2. Decrement Factor 3. Relative humidity 4. Moisture content

Transcription

1 9//8 9//9 9/7/ * - - midvar@sutch.ac.ir * : «Rsarch Nt» Effct f mistur cntnt f building matrials n thrmal prfrmanc f xtrir building walls A. Omidvar *, B. Rsti - Assist. Prf., Mch. Eng., Shiraz Univ. ch., Shiraz, S Iran - MSc. Studnt, Mch. Eng., Shiraz Univ. ch.,, Shiraz, Iran * P.O.B Shiraz, Iran. midvar@sutch.ac.ir Abstract- In this rsarch, th ffct f mistur cntnt n tim lag and dcrmnt factrr has bn invstigatd fr insulatd and nn insulatd walls. Rsults indicatd that mistur cntnt has a vry prfund ffct n transint thrmal prfrmanc f building walls. h ptimum thrmal insulatin thicknss has bn calculatd fr thr diffrnt cnfiguratins, innr, utr and cntral layr insulatin, undr varius mistur cntnts. Rsults shwd that in calculating ptimum thicknss f thrmal insulatins significant rrrs can aris frm th assumptin f dry cncrt. h amunt f th rrr dpnds n th psitin f th thrmal insulatin in th wall. Kywrds: Mistur, hrmal Rspns, Building, B hrmal Insulatin.

2 () j j k c j m () j = ρi i, =,,..., x t c ρ t x m. k. () ( ). min πt π + min ( t) = sin + () p min. P.. ( ).. (DF) (L) P () (). -..[ ].[]. [] [5]. [7] [6]....[8].[9].[8]. im Lag. Dcrmnt Factr. Rlativ humidity. Mistur cntnt 9

3 ( 'C ) (W/m K) (W/m K).[] x (m) []. 6.[9]..... (%) (%) t L = φ = t t A DF = = A > t < t > t min min t t P t t + P () () -.. []. -..[]. % ( h i ) ( h ). ridiagnal Matrix Algrithm (DMA) 5

4 .. %. %5 % %8. (cm) [] Kaynakli O., A rviw f th cnmical and ptimum thrmal insulatin thicknss fr building applicatins, Rnwabl and Sustainabl Enrgy Rviws, Vl. 6, N.,, pp [] Ebrahimpur A., Marfat M., Mhammad Kari B., Optimizatin f insulatin in prmannt usd buildings basd n annual hat lads in iran climat cnditins, Scintific Rsarch Jurnal f Mdars, Vl., N. 7,, pp. -5 [] Asan H., Numrical cmputatin f tim lags and dcrmnt factrs fr diffrnt building matrials, Building and Envirnmnt, Vl., 5, pp [] Asan H., Invstigatin f wall s ptimum insulatin psitin frm imum tim lag and minimum dcrmnt factr pint f viw, Enrgy and Buildings, Vl., N.,, pp [5] Ozl M. and Pihtili K., Optimum lcatin and distributin f insulatin layrs n building walls with varius rintatins, Building and Envirnmnt, Vl., N. 8, 7, pp [6] Mavrmatidis L.E., Mankibi M.E., Michl P. and Santamuris M., Numrical stimatin f tim lag and dcrmnt factrs fr wall cmplxs including multilayr thrmal insulatin, in tw diffrnt climatic zns, Applid Enrgy, Vl. 9,, pp [7] Kntln K.J. and Bikas D.K., h ffct f suth wall s utdr absrptin cfficint n tim lag, dcrmnt factr and tmpratur variatins, Enrgy and Buildings, Vl. 9, 7, pp. -8. [8] h Onlin Rsurc fr Cmnt Cncrt & Aggrgats, (accssd 8 March ). [9] Janssn R. Masurmnt f thrmal prprtis at / 8/ / 8/ /7 / 8/ / / 8/ / / 8/ 5/ 5 (5 ) %

5 [] Al-Sana S.A. and Zdan M.F., Effct f Insulatin Lcatin n Initial ransint hrmal Rspns f Building Walls, Jurnal f thrmal nvlp and building scinc, Vl.,, pp lvatd tmpraturs Brandfrsk prjct 8-, SP Swdish Natinal sting and Rsarch Institut, SP Rprt :6, ISBN , ISSN