¾È³çÇϼ¼¿ä, ÀÌ°÷À» ÅëÇØ ¸¹Àº°Íµé ¹è¿ì°íÀÖ´Â Ãʺ¸ ¿£Áö´Ï¾îÀÔ´Ï´Ù.
ÀúÀåÅÊÅ©ÀÇ ¿¼Õ½Ç/¿À¯ÀÔ·® »êÁ¤À» À§ÇÑ ÆÀ³» ±âÁØÀ» ¼ö¸³ÇÏ´Â ¾÷¹«¸¦ ¼öÇàÇÏ°Ô µÇ¾ú½À´Ï´Ù.
¾÷¹«¼öÇàÀ» À§ÇØ ÆÀ³» Á¸ÀçÇÏ´Â Âü°íÀڷḦ ¹Þ¾ÒÀ¸³ª ¼ö½Ä¾øÀÌ °á°ú°ª¸¸ ÀûÇôÀÖ¾î ÃÑ°ý ¿Àü´Þ°è¼ö °è»ê ¼ö½Ä ÆľÇÀÌ ¾î·Á¿ö Áú¹®µå¸®°Ô µÇ¾ú½À´Ï´Ù.
ÇØ´ç³»¿ëÀº Àú¿ÂÅÊÅ©ÀÇ ¿À¯ÀÔ·®À» °è»êÇÑ ³»¿ëÀ̸ç ÁÖ¾îÁø Á¶°Ç°ú °è»ê°á°ú´Â ¾Æ·¡ ÷ºÎÇÑ µ¥ÀÌÅÍ¿Í °°½À´Ï´Ù.
Heat Gain by Shell Qs = Us*A*¡âT ¸¦ ÅëÇØ °è»êÀÌ µÇ´Â°ÍÀ» È®ÀÎÇÒ ¼ö ÀÖÀ¸³ª, ÃÑ°ý¿Àü´Þ°è¼ö Us°ªÀÇ °Ô»ê¹æ¹ý ÃßÁ¤ÀÌ µÇÁö¾Ê¾Æ ¾î·Á¿òÀ» °Þ°íÀÖ½À´Ï´Ù.
ÁÖ¾îÁø ¿Àü´Þ°è¼ö´Â Ç¥¸é¿¡¼ÀÇ ´ë·ù (hc), º¹»ç(hr), ÅÊÅ© ³»ºÎ¿Í ¿ÜºÎ¿¡¼ÀÇ ¿Àü´Þ°è¼ö hi¿Í ho, insulation data¸¦ ÅëÇØ È®ÀÎÇÒ ¼ö ÀÖ´Â insulation ÀÚÄÏÀÇ Àüµµµµ Kins¿Í µÎ²²Sins, ±×¸®°í ³»ºÎ À¯Ã¼ÀÇ ¿Àüµµµµ KfÀÔ´Ï´Ù.
(Á¦°¡ Å×À̺íÀ» º¸°í ÀÌÇØÇÑ ³»¿ëÀÌ À߸øµÇ¾úÀ»°æ¿ì ÁöÀûÇØÁÖ½Ã¸é °¨»çµå¸®°Ú½À´Ï´Ù.)
±Ã±ÝÇÑÁ¡Àº,
1) ÃÑ°ý ¿Àü´Þ °è¼ö 1/ Us = (1/hc+1/hr+1/hi+1/ho+Sins/Kins) ¼ö½Ä¿¡ ÀÇÇØ °è»êµÈ´Ù°í »ý°¢ÇÏ°í ÇØ´ç ¼öÄ¡µéÀ» ÀÌ¿ëÇÏ¿© °è»êÇÏ¿´À¸³ª ÃÑ°ý¿Àü´Þ °è¼öÀÇ °ª°ú ´Ù¸¥ °á°ú¸¦ ¾ò°Ô µË´Ï´Ù. ÁÖ¾îÁø ¼öÄ¡µéÀ» ÅëÇØ ÃÑ°ý¿Àü´Þ °è¼ö¸¦ °è»êÇÑ Á¦ ¹æ¹ýÀÌ ¾î´ÀºÎºÐÀÌ À߸øµÈ°ÍÀÎÁö ±Ã±ÝÇÕ´Ï´Ù.
2) 1)Áú¹®ÀÇ ¼ö½Ä¿¡¼ ÅÊÅ©ÀÇ º® µÎ²²¿Í ±× Àüµµµµ¸¦ ¼ö½Ä¿¡ ³ÖÁö¾Ê¾Ò´Âµ¥ À̺κÐÀÌ ´©¶ôµÇ¾î ¿Ã¹Ù¸¥ ´äÀ» ¾òÁö¸øÇÑ°ÍÀÎÁö, Á¦°¡ ÁÖ¾îÁøµ¥ÀÌÅ͸¦ Àß È°¿ëÇÏÁö ¸øÇÑ°ÍÀÎÁö ±Ã±ÝÇÕ´Ï´Ù.
3) ÇØ´ç µ¥ÀÌÅÍ¿¡¼ hc, hr, hi, ho ¸¦ »êÁ¤ÇÏ´Â ±ÔÄ¢À̳ª ¼ö½ÄÀÌ ÃßÁ¤ÀÌ °¡´ÉÇÒ±î¿ä? ÁÖ¾îÁø µ¥ÀÌÅ͸¦ º» »çÀÌÆ®ÀÇ °ú°Å À¯»ç ÁúÀÇ¿¡ ¿Ã·ÁÁֽŠ¼ö½Ä¿¡ Àû¿ë½ÃÄÑ µû¶óº¸¾ÒÀ¸³ª ±× °ªÀÌ ¸¹ÀÌ ´Þ¶ó ¿Àü´Þ°è¼ö »êÃâ±Ù°Å ÃßÀûÀÌ ½±Áö¾Ê½À´Ï´Ù.
µ¥ÀÌÅÍ´Â ¾Æ·¡¿Í °°À¸¸ç, Áú¹®³»¿ë ÀÌ¿Ü¿¡ Á¦°¡ À߸ø ÀÌÇØÇÏ°íÀְųª ÆľǸøÇÑ ºÎºÐ¿¡´ëÇؼ ÁöÀûÇØÁÖ½Ã¸é °¨»çµå¸®°Ú½À´Ï´Ù.
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1.
Input data | | | | | | | |
Environment Data
& Fluid Property | Tank data |
Air
temp. (ta) | ¡¡ | 100.4 | F | Diameter | ¡¡ | 10.83 | ft |
Wind
velocity (V) | 67.11 | mi/hr | Heignt | | 26.25 | ft |
Gravity
accelaration (g) | 4.18E+08 | ft/hr2 | Stored Temp. | -13 | F |
¡¡ | | | | ¡¡ | Pressure | | 14.84 | psia |
Density
(r) | | 43.82 | lb/ft3 | ¡¡ | | | ¡¡ |
Thermal
conductivity (Kf) | 0.0739 | Btu/ft.hr.F | ¡¡ | ¡¡ | ¡¡ | ¡¡ |
Specific
heat (Cp) | 0.455 | Btu/lb.F | Insulation data |
Viscosity,
cp X 2.24 | 1.249 | lb/ft.hr | Ther.Cond.(Kins) = | 0.01 | btu/ft.hr.F |
Coff.
of Vol. Expansion | 0.0004 | 1/F | Thickness(Sins) = | 0.164 | ft |
Emissivity | | 0.8 | ¡¡ | Resistant (Rins) = | 15.763 | ft2.hr.F/Btu |
¡¡ | | | | ¡¡ | ¡¡ | | | ¡¡ |
Fouling
factor = | ¡¡ | 0.005 | ft2.hr.F/Btu | ¡¡ | ¡¡ | ¡¡ | ¡¡ |
| | | | | | | | |
2.0
Heat Gain by Shell | | | | | | |
| ¡¡ | Coefficient of | ¡¡ | ¡¡ | Coefficient of | ¡¡ | ¡¡ |
| Assumed | Convection | Radiation | Calculated | Assumed | Inside film | Outside film | calculated |
| ts | hc | hr | ts | tw | hi | ho | tw |
| 98.8 | 3.103 | 0.97 | 98.68 | -12 | 6.634 | 4.073 | -11.94 |
| | | | | | | | |
| Total heat transfer coeff. (Us)= | | 0.06186 | Btu/ft2.hr.F | | |
| Area of Tank shell = | | | 1138.7 | ft2 | *Head Area : | 245.6 |
| Heat Gain by Shell. (Qs) = | | 7988 | Btu/hr |
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| Ambient temperature | 38 | ¡É | | | |
| Fluid temperature | | -25 | ¡É | | | |