Sheet1BAN TNH TOAN HE THONG QUAT TAO AP CAU THANG1.He thong quat tao ap cau thang c tnh toan theo cac tieu chuan sau:a.BS EN 12101-6: 20005 - Smoke and heat control systemsb.ASHRAE Hand book HVAC application.c.TCVN 6160: 1996 PCCC nha cao tang yeu cau thiet keA -QUAT TAO AP CAU THANG BO :1.Lu lng go x qua ca khi ca ongCong thc tnh: Q1 = 1,5*(m-n)*0.839*AE*P1/2 (M3/s)Trong o:Q1 - Lu lung go x qua ca (m3/s)AE - He so dien tch gio x qua ca (m2)m - Tong so lng can - So lng ca m ong thiP - o chenh lech ap trong va ngoai cau thang (Pa)Loai caKch thcmHng ca mAEP(Pa)Q1(m3/s)Ca n m ngcAE=0.01Ca n900x220028Ngc chieu gio0.010502.136Ca n m xuoiAE=0.022.Lu lng go cung cap vao buong thang e nang ap suat t 0 len en 50(Pa)Ca oiAE=0.03Cong thc tnh: Q2 = 0.559*N*Asb*(Dp3/2sbt - Dp3/2sbb)/ (Dpsbt - Dpsbb) (M3/s)Trong o:N: so lng tang.Asb: he so dien tch cua cau thang so vi dien toa nha ( tren 1 tang lau) (m2)Asb = Abo+AdoAbo: he so dien tch cua toa nha so vi dien tich ben ngoai ( tren 1 tang) (m2)Ado: he so dien tch cua ca so vi dien tich ben ngoai ( tren 1 tang) (m2)Dpsbb : o chenh lech ap suat cua ay cau thang so vi ben ngoai ( pa)Dpsbt : o chenh lech ap suat cua nh cau thang so vi ben ngoai (pa)NDpsbbDpsbtAsbAboAdoQ2(m3/s)1420500.060.040.013.953.Lu lng gio tran qua ca khi ca mCong thc tnh: Q3 = n*V*F (M3/s)Trong o:v - van toc gio qua ca (M/s)F - Dien tch ca (M2)LOAI CAKCH THCDp (pa)nv(M/s)Q3(m3/s)CA N900x22002041.007.9204Lu lng gio cua quat tang ap (m3/s) :Q' =Q1+ Q3 =10.056(m3/s)a.Tong lu lng gio khi ca m Q3= 10.056 (m3/s) > Q1+Q2 =6.089(m3/s)b.Quat tang ap c tnh chon co lu lng go bu u cho lung go x qua ca va khi ca mc.He so ro r cua ong gio:5%d.Lu lng gio cua quat tang ap (M3/S) :Q=Q'*1.05=10.56(m3/s)eChon van toc gio trong truc riser VS:15(m/s)fTiet dien ngang cua ong VS:0.70m2Quat tao ap cho thang may:Q1=1.5*0.83*Ae*SQRT(P)*NThang may ben phai:Ae=0.06P=50PaN=10Q1=5.28(m/s)Thang may ben phai:Ae=0.06P=50N=11Q1=5.81(m/s)

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