除濕機(jī)設(shè)計(jì)計(jì)算

除濕機(jī)設(shè)計(jì)計(jì)算,,,,,,,,,

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名義工況,,,,,,,,,

干球溫度,27,℃,,大氣壓,101325,pa,,,

濕球溫度,21.2,℃,,,,,,,

相對濕度RH,0.6,60%,,,,,,,

設(shè)計(jì)除濕量,0.25,kg/h,上下偏差5%,,,,,,

設(shè)計(jì)最大負(fù)荷工況,,,,,,,,,

干球溫度,32,℃,,,,,,,

濕球溫度,23,℃,,,,,,,

設(shè)計(jì)低溫工況,,,,,,,,,

干球溫度,18,℃,,,,,,,

濕球溫度,13.5,℃,,,,,,,

設(shè)計(jì)蒸發(fā)溫度,8,℃,,,,,,,

過熱度,8,K,,,,,,,

冷凝溫度,45,℃,,,,,,,

過冷度,2,K,,,,,,,

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查水蒸氣飽和壓力Pqb，得到27℃時(shí)飽和壓力為Pqb=(用濕空氣焓濕圖軟件查詢),,,,,,,,3566.59,Pa

則在T干=27℃RH=60%工況下水蒸氣分壓力為：Pq=RHxPqb=,,,,,,,,2139.954,

絕對濕度dA=,13.41987973,g/kg干,,,,,,,

對應(yīng)比焓hA=,61.35139894,kj/kg,,,,,,,

A工況下的空氣密度,,,,,,,,,

ρA=,1.20,kg/m3,,,,,,,

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設(shè)計(jì)B工況為,,,,,,,,,

干球溫度Tb,16.4,℃,,,,,,,

相對濕度RHb,0.9,90,%,,,,,,

絕對濕度db,10.5857,g/kg干,查表得,,,,,,

焓值Hb,43.259,kj/kg,,,,,,,

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C點(diǎn)的工況,,,,,,,,,

hc=ha+P電/M（空氣質(zhì)量流量）,,,,,,,,,

絕對濕度dc,10.5857,g/kg干,,,,,,,

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循環(huán)風(fēng)量（入口27℃，60%）,,,,,,,,,

F=,0.073507453,74,m3,,,,,,

空氣質(zhì)量流量M,0.024502484,kg/s,,,,,,,

制冷量P冷,0.44,kW,,,,,,,

蒸發(fā)器,,,,,,,,,

蒸發(fā)器對數(shù)平均溫差：△tm,,12.99,℃,,,,,,

蒸發(fā)器面積Az,0.000853377,0.85,m2,3.781924995,,,,,

換熱系數(shù),40,w/℃。m2,,,,,,,

取設(shè)計(jì)余量系數(shù)1.1,,,,,,,,,

則AZ,0.94,m2,,,,,,,

迎面風(fēng)速取2~3m/s,,,,,,,,,

S迎面面積,0.01,m2,,,,,,,

設(shè)單管長度為L,0.28,m,,,,,,,

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選用換熱管的直徑d0,7,mm,,,,,,,

壁厚,0.35,mm,,,,,,,

翅片厚度,0.115,mm,,,,,,,

片距,2,mm,,,,,,,

管間距H1,21,mm,,,,,,,

管間距H2,12.7,mm,,,,,,,

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計(jì)算單位外表面銅管和翅片面積,,,,,,,,,

S1,,m2,,,,,,,

S2,0.2256,m2,,,,,,,

單位管長總面積St,0.2256,m2,,,,,,,

則所需翅片管總長度,4.16,m,,,,,,,

則所需的管數(shù)n,16,根,通常取偶數(shù)根,,,,,,

單排管數(shù)m,2,根,,,,,,,

管排數(shù),8,,,,,,,,

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冷凝器,,,,,,,,,

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C點(diǎn)的工況,取制冷系數(shù),3,,,,,,,

hc=hb+（（1+1/cop）*P冷/M）,,67.38,KJ/KG,,,,,,

求出風(fēng)溫度tc,39.94,℃,,,,,,,

飽和水蒸氣分壓力,Pqb（tc）,7904.2,pa,查表得,,,,,

相對濕度RHc,0.237,23.7,%,,,,,,

冷凝器換熱系數(shù),,35,w/℃。m2,,,,,,

冷凝器面積計(jì)算,,,,,,,,,

冷凝器對數(shù)平均溫差：△tm,,13.59,℃,,,,,,

Al面積,0.001242619,1.242618715,m2,,,,,