Скачиваний:
20
Добавлен:
01.05.2014
Размер:
44.06 Кб
Скачать
4h]j

T∆ W Tihl±khklZ\eyxsb_ ihlhdZ l_ieZ \ j_amevlZl_ l_iehi_j_^Zqb T,, L khhl\_lkl\m_l T∆ W ±aZ

kqzl jZaghklb W b Tih]±ih]ehszggh]h we_f_glZ aZiheg_gby kheg_qgh]h l_ieZ Bl_gkb\ghklv ijhgbdZxs_c jZ^bZpbb ^ey \_jlbdZevgh]h hdhggh]h ijhzfZ h[uqgh hij_^_ey_lky \ \b^_

T,, 5 6< .I 6 .bgk '< .I > Dh[ D5 .i_j DaZlj DZlf

< wlhc nhjfme_ T,, 3±aZ\bkbl hl bgl_gkb\ghklb ijyfhc 6\ b jZkk_ygghc '\ jZ^bZpbb gZ \_jlbdZevgmx ih\_joghklv dhwnnbpb_glh\ ijhimkdZgby aZiheg_gby DI 6 b DI '

\ebygb_ hljZ`zgghc jZ^bZpbb D5 \ebygb_ i_j_iezlh\ hdgZ DI?J _]h hdgZ aZ]jyag_gby DA:=J b aZ]jyag_gby Zlfhkn_ju D:LF Hkgh\gh_ \ebygb_ gZ T,, J hdZau\Zxl kl_i_gv hk\_szgghklb bgkheypbb khegp_f ih\_joghklb hdgZ Dbgk b _]h h[emqzgghklv jZkk_ygghc jZ^bZpb_c g_[hk\h^Z Dh[e

Dhwnnbpb_gl bgkheypbb Dbgk hlghr_gb_f hk\_s_gghc khegp_f iehsZ^b hdgZ dh \k_c _]h iehsZ^b ?]h jZkqzl Dbgk k\yaZg k ihkljh_gb_f l_g_c iZ^Zxsbo gZ ih\_joghklv hdgZ hl khegp_ aZsblguo mkljhckl\ dZjgbah\ hldhkh\ b l ^

>ebgZ l_gb Ob _z iheh`_gb_ hij_^_ey_lky aZ\bkbfhklyfb

OO WJα FRVϕ L ϕ DUFWJ VLQα FWJK

]^_ O±\_jlbdZevguc hlj_ahd ^ebghc O gZ ih\_joghklb ex[hc hjb_glZpbb O^ebgZ l_gb hl ex[h]h aZl_gyxs_]h mkljhckl\Z

α kheg_qguc Zabfml kl_gu K m]he \ukhlu klhygby khegpZ

Dhwnnbpb_gl h[emq_gghklb Dh[e hdgZ g_[hk\h^hf bkoh^y ba aZdhgZ aZfdgmlhklb emqbkluo ihlhdh\ jZ\_g

Dh[e = ϕ HD −g_[ = − ϕ HD −L

]^_ ϕ dhwnnbpb_gl h[emq_gghklb k ih\_joghklb hdgZ \ klhjhgm g_[hk\h^Z b ^jm]bo _]h ih\_joghkl_c

L_iehi_j_^ZqZ q_j_a hdgh aZ kq_l jZaghklb l_fi_jZlmj b ih]ehs_gby l_ieZ fh`_l [ulv jZkkqblZgZ ih mjZ\g_gbyf l_iehh[f_gZ b l_ieh\h]h [ZeZgkZ h^bgZjgh]h beb ^\hcgh]h hkl_de_gby k mq_lhf l_ieZ kheg_qghc jZ^bZpbb ih]ehs_gby kl_deZfb GZijbf_j ^ey ^\hcgh]h hkl_de_gby

TΙΙ 7 = Tih] + T∆ W = 3 + 3 T + W+ − W%

]^_ 3 b 3 dhwnnbpb_glu ih]ehs_gby khhl\_lkl\_ggh i_j\h]h b \lhjh]h ih oh^m kheg_qgh]h emqZ hkl_de_gby ^ey h[uqgh]h hdhggh]h kl_deZ J

Ba n ke_^m_l qlh ih]ehs_gb_ l_ieZ \lhjuf kl_dehf y\ey_lky hkgh\ghc khklZ\eyxs_c TΙΙ 7 Ke_^h\Zl_evgh ijb ijbf_g_gbb ki_pbZevguo ih]ehsZxsbo beb hljZ`Zxsbo kl_dhe g_h[oh^bfh bf_lv \ \b^m qlh \lhjh_ kl_deh g_ ^he`gh [ulv ih]ehsZxsbf `_eZl_evgh qlh[u hgh [ueh hljZ`Zxsbf kheg_qgu_ emqb MqZklb_ dZ`^hc ba khklZ\eyxsbo T <l f ^ey ^\hcgh]h hkl_de_gby \ Fhkd\_ \ e_lgbo mkeh\byo hdZau\Z_lky ke_^mxsbf

TΙΙ

TΙΙ S

T6

T'

T5

TΙΙ 7

 

 

 

 

 

 

H[sb_ l_iehihklmie_gby \ ihf_s_gb_ aZ kq_l l_iehi_j_^Zqb q_j_a fZkkb\gu_ b emq_ijhajZqgu_ HD jZkkqblu\Zxlky ih ijZ\bem keh`_gby < ijhkl_cr_f kemqZ_ dh]^Z ihf_s_gb_ bf__l h^gh fZkkb\gh_ h]jZ`^_gb_ kl_gZ b hdgh kj_^gyy aZ kmldb \_ebqbgZ l_iehihklmie_gbc aZ kq_l l_iehi_j_^Zqb q_j_a gZjm`gu_ h]jZ`^_gby jZ\_g

4h]j

= 4Ι

+ 4ΙΙ LH

Z Zfieblm^Z h[sbo l_iehihklmie_gbc

 

$4h]j

= $4Ι

+ :4ΙΙ 7 ψ

?keb \ ihf_s_gbb [he__ ^\mo h]jZ`^_gbc gZijbf_j bf_xlky jZaebqgh hjb_glbjh\Zggu_ ih klhjhgZf k\_lZ gZjm`gu_ kl_gu i_j_djulby hdgZ lh jZkq_l h[sbo l_iehihklmie_gbc aZ kq_l l_iehi_j_^Zqb ijh\h^yl ihiZjguf kmffbjh\Zgb_f j_amevlZlh\ kdeZ^u\Zxl ihklmie_gby l_ieZ q_j_a gZjm`gu_ kl_gu b i_j_djulby k ihklmie_gbyfb l_ieZ q_j_a hdgZ b l ^

Ij_ju\bklu_ l_iehihklmie_gby jZkkqblu\Zxlky hl^_evgh GZijbf_j l_ieh ijhgbdZxs__ q_j_a hdgh kheg_qghc jZ^bZpb_c oZjZdl_jbam_lky \_ebqbghc ij_ju\bklh]h l_iehihklmie_gby 4ΙΙ 3 PD[ <j_fy _]h ^_ckl\by jZ\gh

P′ = 4ΙΙ 3

4ΙΙ 3 PD[

ijbq_f 4ΙΙ 3 PD[ khhl\_lkl\m_l k_j_^bg_ l_iehi_j_^Zqb Ijb kh\f_klghf ^_ckl\bb ]Zjfhgbq_kdbo b ij_ju\bkluo l_iehihklmie_gbc bo kmffZ fh`_l [ulv ijb\_^_gZ ih j_dhf_g^Zpbyf baeh`_gguf \ ξ 9ΙΙ kf ;h]hke©Kljhbl_evgZy l_iehnbabdZª

Соседние файлы в папке Строительная теплофизика