冷水机组设计实例

1、冷水机组设计储云霄热能 07022112t 7t 2tts1s2032t 37t 401w2k表1 状态点27332h1tht2p2h2t4h40Oh4kJ/kg表2 单位质量制冷量单位体积制冷量单位指示功q h hkJ/kg015v01w h hkJ/kg35.57i212400q q v 取 0.75hm 1i0i0k0ic取 0.90mP i m0.86冷凝器负荷能效比Q q q59.63.75kmkEER Q P044m hV2p m h。V2pm kg s q 1 308mmd，i Z =29 N S mb132mm5mmH S 21Bb16n 14b2 H n2b18n。b32D2

2、HL图1 :( ) 3.1416 0.012 4 29 (1.96 2 0.032) 8.29A d NZ L m210mB:( ) 3.1416 0.012 4 29 (1.96 2 0.032 19 0.005) 7.88 m2b bA d NZ LN1c0mB fu 。12S 18S220.199mSS1N 181b3 S(d n d )(0.308190.012)0.19915.910 mA32cib30c t t ) Q m /sq033v,ffp,fs1s2q2.4103u c0.151m/sv f,15.9103Ac1 K D n d 0.0095m;A122024111iA K

3、 D n d 0.0084m22024b2b2ib2K 2b表 2 bH/Di0.300.450.07390.1120.1540.1980.2450.2930.343b1 (A A )0.009mA22b1b2qv fA0.00240.0090.27m/sub,buuu cb1u u u 0.2m/s1b ct (t t )/29.5fs1s2Pr 9.693W /(mK)1.33 m /s c 4192J /(kgK)； ； ，；62fffpd u0Re 1815.6fff0.57290.012 0.22 Re Pr0.221815.6 9.693W /(m K)f0.60.330.60.3

4、32dfff0 用下标 w 表示管内制冷剂系数。假设按内侧传热表面 A 计算的热流密度i q vi0.6 0.257.8amdw0.2ia。表 3 a值a10R1421.001.261.552R410a1.321.642.05-30-10+101.642.022.54aqqv 127/(m s)m,2mddm22 iZ2i444m1270.2q vi0.6 0.257.8a57.80.0189mq 7.234q0.60.60.010.2dw0.2i 由qw 4q4um s /m Z d 22miu dRe7.7104i0.3164Re0.25 0.0190 fl 1 1 1p u 422d 2

5、 2rip plRr 可R4表 4 值R m s1004001.2210.53 0.587 0.632 0.67 0.75 0.82 0.98R 2 32.58kg /mp p 10555.7t3 0RlRrp）pilp p 31.67kPailt tt 1s2t tm 10t ts20 1K 11ddd1( R )00( R )d2dd1wimf1=1 12 0.001 1210.0910 0.04510337.234q0.610 380 11 2005.71qq q K t 1AdW /m200Ai0d1imiqW /m2q iAiA0dq q q W /m2i0idi01K W /(m

6、K)211ddd1( R )00( R )d2dd1wimf q 0QF m20q0F 1.2F m2lreqlcal 2S d d ，fibtd。tStfhi d dbt图2 / dm m /S a2dttf(d d )22m /ma2tb2Sff (d S )t0.0332m /mabf2Sbfa a a m /ma2ofdfb W /m20QA 11.8m2k0Aofa78.4mLof LN994.20kg/m3c 4179J /(kgK)，pQq v0.00287m /s3kt t ) cpw210.00287qvZ 10.93.14164d u20.013 224i 2 平均流速 取传热管有效单管长 则实际布置外冷凝器传热面积A m 2of 6 34.5tm m /s Pr 4.92 W /(mK)；62f1.960.0110.757106duiRe2848010h W /(m K)2w,idffi 0.788。n T kh T t )0.250.25k,obnkw,o0.7251446.10.01286 1.3840.78838500.250.250.2500t tt 5.11w2t tmkw2t tk1R q :i0 q h0.7500k,o0q 1172(5.1 )00 q q 000