《暖通空调》复习详细习题集和答?- 百度文库

̲ĸ¼28813ɢÿƬɢΪ0.28m2Ƭn?Ϊ

?=F1?/f? n13.23m20.28m/Ƭ2.09m20.28m2/Ƭ2.85m22?11.5?12Ƭ

?=F2?/f?n2?7.5?8Ƭ

?=F3?/f?n30.28m2/Ƭ?10.2?11Ƭ

УƬϵ?1ֵ̲ĸ¼30ɢƬΪ11~20ʱ?1=1.05ɢƬΪ6~10?1=1.00

2ˣʵɢΪF1=F1??1=3.231.05 = 3.39 m

2F2=F2??1=2.091.00 = 2.0 m 2F3=F3??1=2.851.05 = 2.99 m

ʵѡƬΪn1=F1/f?3.39m20.28m2/Ƭ2.09m20.28m/Ƭ2.99 m20.28m2/Ƭ2?12.1?13Ƭ

n2=F2/f??7.5?8Ƭ

n3=F3/f??10.7?11Ƭ

ܺ˫ϵͳɢѡӰ죺

ڵϵͳص㼴ÿɢijˮ¶һɢĽˮ¶ȣɢɢȣÿɢˮȺ˳ƽý¶½䴫ϵ𽥽ͣ䴫ڶӦȸӦӡ˫ϵͳɢͬĽˮ¶Ⱥͳˮ¶ȣͬƽý¶ȣͬĴϵӰ죬˫ϵͳɢһȵϵͳСЩ

5-27 ijůϵͳȸΪ70 kWˮ¶Ϊ95棬ˮ¶Ϊ70棬ϵͳˮõѹýDZΪ2250 kJ/kg

⡿ ˮůϵͳQ?Gc?tϵͳˮΪ

G?Q70kW?=0.67 kg/s c?t4.19kJ/(kg?0C)?(95?70)0C70kW=0.03 kg/s

2250kJ/kg ůϵͳΪG?5-28 ͼʾеѭˮůϵͳܵɢʧϵͳˮ¶tg=95棬ܶȦ= 962 kg/m3ˮ¶th=70棬ܶΪ?= 978 kg/m3ϵͳΪ280kPaѭˮõ̡

ͼ5.4 5-28ͼ

⡿ ⣬ѭˮõ

W?1.1?Qc?t?1.1?(2?1.5)kW4.19kJ/(kg?0C)?(95?70)0C0.037 kg/s

ɹˮܶȲĸѹͷΪ

?P?(?1??2)g?H1 ?(978?962)kg/m3?9.8N/kg?2500m?500m?500m1000

?548.8 Pa ?P???Pʿɺԡ 1 ˮõΪ

?H?1.1??P?g?1.1?2?280 kPa?103(962?978)kg/m3?9.8N/kg?32.4 m

5-29 ͼ5-5ʾˮůϵͳ֪h1=2.0mh2=3.5mÿɢȸΪ800Wˮ¶Ϊ95棬ˮ¶Ϊ70棬Ӧ¶ȵˮܶȷֱΪ962kg/m3978kg/m3ˮ;ȴֱ˫ܺ͵ϵͳȻѭѹ

ͼ5.5 5-29ͼ

⡿ ˫ϵͳѭѹ

˫ϵͳڲ·ɢڻ·öֱͬ㡣 ʽ3-1-3ͣ3-1-4[4]ļ㷽ͨɢѭ·öֱΪ

һ㣺

?P1?gh1(?h??g) ?9.81N/kg?2m?(978kg/m3?962kg/m3) =313.92 Paڶ㣺

?P?gh1+h2(?h??332g)?9.81N/kg?2+3.5m?(978kg/m?962kg/m)=863.28 Pa 󵥹ϵͳѭѹ ڶɢ·еˮ£

t800Wo2?tg?Q2Q(tg?th)?95oC?1?Q2(800+800)W(95C?70oC)=82.5 oC

Ӧˮܶ?32=970 kg/m ?Ph?gh1(?1??g)+gh2(?2??g)

?9.81N/kg?2m?(978kg/m3?962kg/m3)+9.81N/kg?3.5m?(970kg/m3?962kg/m3) =588.6 Pa

t2,?2

ͨ

6-1 ͨĹĿ࣬ͨ緽ʽļ֣Ӧкص㣿 6.1

6.1 ͨ緽ʽԱȱ

෽ʽ ͨĿ ¹ͨ ʽͨ Ŷ ͨ緽ʽ һ㻻ͨ ȷ繩ů Ӧص ּҪԱ˵ĸȾ˵̵ĺ׼ ָͨڹҵУ·Ͽˡȵȴ뽨ڣ򲿷ֲȫֲʧȻ иչвк塢۳Ϊ彡άĻ Ϊųͻ¼ĴȼաըΣж塢 ˷ҵⳡԷԭӷ估Ⱦ սʱָӡͨŻҽơȻȻȫĿеʽͨ硢ʽͨʽͨ/ ΪֹʱƻȡǰҼ¥ݼͨԱ֤ȫɢԱ˳˾õķʩ ͨ綯 еͨ Ȼͨ ʹͨɵķѹ²ɵѹʹЧӦȿ ͨѹʹضռ֯ͨҪֶΣͨϵͳ㷺õһͨ緽ʽ ŷ ͨΧ ֲͨ ȫͨ ͷ ·򾭱ҪϻҪĿͨܵ; ڽȾһͨܵ;ų⡣ ڿռΪͷŷ磬ڽڲȾԴΪɢȷͨϴ ԽڲȾԴھֲλõԾֲȾΪ

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