蒸發(fā)器的設(shè)計(jì)計(jì)算

1、蒸發(fā)器設(shè)計(jì)計(jì)算已知條件：工質(zhì)為R22，制冷量，蒸發(fā)溫度，進(jìn)口空氣的干kW3Ct??70球溫度為，濕球溫度為，相對濕度為％；出口空Cta??211Ctb??5.15134.56??氣的干球溫度為，濕球溫度為，相對濕度為％；當(dāng)Cta??132Ctb??1.11280??地大氣壓力。PaPb101325?（1）蒸發(fā)器結(jié)構(gòu)參數(shù)選擇選用紫銅管，翅片厚度的鋁套片，肋片間距mmmm7.010??mmf2.0??，管排方式采用正三角排列，垂直于氣流方向

2、管間距，沿mmsf5.2?mms251?氣流方向的管排數(shù)，迎面風(fēng)速取。4?Lnsmwf3?（2）計(jì)算幾何參數(shù)翅片為平直套片，考慮套片后的管外徑為mmddfob4.102.02102???????沿氣流方向的管間距為mmss65.21866.02530cos12?????沿氣流方向套片的長度為mmsL6.8665.21442????設(shè)計(jì)結(jié)果為mmsL95.892565.2132532??????每米管長翅片表面積：fbfsdssa1000

3、42221?????????????5.210004.10414.365.212522????????????mm23651.0?每米管長翅片間管子表面積：②最窄截面處空氣流速????????smsssswwfffdfb58.52.05.25.24.102525311max?????????③干表面?zhèn)鳠嵯禂?shù)干表面?zhèn)鳠嵯禂?shù)用小型制冷裝置設(shè)計(jì)指導(dǎo)式(48)計(jì)算15.04.00max42618.00014.0?????????????????

4、???booffaavdw?15.04.0603267.03951.01048.140104.058.52168.00014.0???????????????????00792.0???????kmWPcwrpff???????23232max402.68704.0100558.5215.100792.0???（4）確定空氣在蒸發(fā)器內(nèi)的變化過程根據(jù)給定的進(jìn)出口溫度由濕空氣的焓濕圖可得。在空氣的kggdkggdkgkJhkgkJh443.

5、7723.8924.31364.432121????焓濕圖上連接空氣的進(jìn)出口狀態(tài)點(diǎn)1和點(diǎn)2，并延長與飽和氣線相交于??0.1??點(diǎn)w，該點(diǎn)的參數(shù)是。CtkggdkgkJhwww????86.625在蒸發(fā)器中空氣的平均比焓值kgkJnhhhhnhhhhwwwm73.3625924.3125364.431924.31364.432512121???????????由焓濕圖查得kggdCtmm82.16???析濕系數(shù)42.182.166.68