1、GM DAEWOO Auto & Technology EDS Engineering GM DAEWOO Auto & Technology Standards AT-QUALITY CHECK OF HEAT EXCHANGER EDS-T-2242 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 2 EDS-T-2242AT-QUALITY CHECK OF HEAT EXCHANGER PAGE: 1/4 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19
2、VERSION: 2 GM DAEWOO Auto & Technology 1. PURPOSE Quality Check 2. EQUIPMENT Heat Exchanger - Test Stand Cooling substance: water 1.0. Cooling water circulation at least 80 N /min 1.1. Infinitely variable control of water temperature +20 +80 1.2. Temperature indications for water input and output .
3、 85 1.3. Water quantity indication 50 80 N /min 1.4. Pressure indication for water input . 120 kPa Substance to be cooled: Automatic - Transmission - Fluid (ATF) Specific density = 0.86 0.90 kg/dm3at +20 Specific Heat “cm“ Temperature Kinematics Viscosity kJ.(kg K) kcal/(kg ) 0 + 20 + 50 + 100 + 16
4、0 80 . 95 mm2/s 22 . 29 mm2/s 5.8 . 8 mm2/s 1.800 1.905 2.052 2.261 2.470 0.43 0.45 0.49 0.54 0.59 2.0. ATF - circulation, at least 8 l/min 2.1. Infinitely variable control of ATF - temperature . 120 2.2. Temperature indications of STF input and - output . 120 2.3. ATF - quantity - indication . 8 N
5、/min. 2.4. Pressure indication of ATF - input and - output . 500 kPa 3.0. Heat exchanger - test tube 53, length: 500 3. TEST PROCEDURE 1.0. Test Performance After installation of the heat exchanger to be tested in the test tube, the following test conditions are to be obtained and stabilized for at
6、least 5 minutes before test data recordings: 1.1. Operate heat exchanger in countercurrent flow 1.2. Cooling water flow 80 N /min. 1.3. Cooling water input temperature 80 1.4. Cooling water input pressure 100 kPa. 1.5. ATF - circulation variable, 5 -8 N /min. Specification on drafting 3453920 valid
7、using 5 /min only. EDS-T-2242AT-QUALITY CHECK OF HEAT EXCHANGER PAGE: 2/4 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 2 GM DAEWOO Auto & Technology 1.6. ATF - input temperature 120 1.7. ATF - input pressure 400 kPa. Subsequently record the following test data: Water - output temper
8、ature ATF - output temperature ATF - output pressure at 5 /min. ATF - circulation at 8 /min. ATF - circulation 2.0. Calculation of heat exchanger characteristics: meaning of the following: tEFinput temperature of the ATF () tAFoutput temperature of the ATF () tFtemperature difference of the ATF (K)
9、tEWinput temperature of the cooling water () tAWoutput temperature of the cooling water () tmaverage temperature difference of the flowing substances along the heat exchanging surface (K) tGrmax. value of the temperature difference (K) tK1min. value of the temperature difference (K) pEFinput pressur
10、e of the ATF (kPa) pAFoutput pressure of the ATF (kPa) pFpressure loss of the ATF (kPa) msmass flow (kg/min) Vsvolume flow (dm3/min) density (kg/dm3) Qsheat flow (W) cmaverage specific heat (KJ/(kg K) k coefficient of heat transmission (W/(K m2) A are (m2) 2.1. Pressure loss (kPa) 2.2. Temperature d
11、ifference (K) As a rule the values mentioned above are sufficient for the checking of the serial production. PF= PEF-PAF tF= tEF- tAFEDS-T-2242AT-QUALITY CHECK OF HEAT EXCHANGER PAGE: 3/4 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 2 GM DAEWOO Auto & Technology 2.3. Specific capaci
12、ty of heat transfer from the basic formula QS= kAtm(W) results (W/K) where ms= V (kg/min) Qs= msCm(tEF- tAF)60 (W) tGr= tEF- tAF(K) tKL= tAF- tEw(K) K1tGrtlnK1tGrtmt= (K) 2.4. Compression Strength The heat exchanger shall be leakproof if exposed to a compression of 1150 kPa for 3 minutes and may not be deformed visibly and constantly. mt SQAk =EDS-T-2242AT-QUALITY CHECK OF HEAT EXCHANGER PAGE: 4/4 ISSUED DATE: 1996. 07. 10 REVISED DATE: 2006. 06. 19 VERSION: 2 GM DAEWOO Auto & Technology
