الباب االأول مقدمة في مجال المقاوالت وتكييف الهواء

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     | داا / ماا   ط    / م F UTURE WAY   اوادجواكااو      ابلوا   توا   ل      اا     __________________________________________________________________________________________________________________ Telephone no.:01126069943 www.facebook.com/thefutureway    Page 1 - ا 1 - أاااواوا (HVAC)  2 2 - CODES AND STANDARDS  5 3 - اا the objective : 5 4 - Refrigeration Systems:- ئاوااااو  7 5 - اااا  10 6 - ااااا :-   11 7 - اااا   12      ابلوا   توا   ل      اا     __________________________________________________________________________________________________________________ Telephone no.:01126069943 www.facebook.com/thefutureway    Page 2 1-  تاق   ل      ا   تاو   تاا (HVAC)   - راا ا    . ةراا   ترد      ق   دو               ا   لةراا   عاا  ا   ةراا sensible heat ةراا   يا .    ةراا   ترد   ق        ةرااا latent heat    ا   ةراا       .  ا   ر      اا         را        ا   عااراا   ل 1- ا convection . ئاا   لخ      ا   ةراا    2- عشا Radiation         ع   ةراا   ن   ةرا      ا   ا      ا   ةرا   رد         يا   نا    . ذ      ا 3- ا   وا   ا conduction . ا   داا   لخ   ا   ا   ةراا    - )BTUthermal unit(British ( ةرا   رد      ا   ةراا      و      س   ةو ONE POUND )   .    ةاو   رد   1 POUND WATER 1 POUND WATER 72 °F 73 °F ةرارح   ذخأ 1 BTU    ابلوا   توا   ل      اا     __________________________________________________________________________________________________________________ Telephone no.:01126069943 www.facebook.com/thefutureway    Page 3 ةراا   رد         ها    1°F ةرا      ج 1BTU .   - Specific heat   رد      مزا   ةراا   ةرا ONE POUND د   ى    ةاو   رد .  - volumeSpecific . ا      ةدا      وا         را   و   ةد   ا   ب   - Ambient temperature  ( ةرا   رد   و  ) ا ( را   اا   ةرا   رد    atmospheric condition surrounding outdoor air temperature) ... راا   لا   ب      م   رود   و      را      ذخؤ   ن  ..   - ا   ا  Ton of refrigeration لد      ا   ةرا   وذ ( ط   نز       POUND 2000 لخ  )( م 24 وو        )  12000 BTU /HR أ   و ا   ا   س   مة .  لخ   ا      ط   او    24    او      ا   ةراا     pound لخ   ا    24 لد    144 BTU1 TON = 2000 PI  اذ 2000*144=288,000 BTU/ 24 HR ا   ةراا = ما         ط   او      ز 288000 BTU  = ا         ط   او      زا   ةراا 12000 BTU1 ton of refrigeration (1 T.R) = 12000 BTU/ HR    - اا   
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