文档介绍：Lesson 5
Convective heat transfer as the main form of heating called convection heating . Cooling devices in the system is the radiator, so this system is also known as the radiator heating systems , it is a convection heating to the interior . Radiant heating is radiative heat transfer based heating . Radiant heating systems , cooling equipment , the radiation metal plate or portion of a building roof , floor or wall as a heat radiation surface .
2. Can be divided into different power system cycle , the gravity of the circulatory system and mechanical circulatory system . Poor rely on the density of water circulation system , known as the gravity of the circulatory system ; circulation systems rely on mechanical force , known as mechanical circulatory system . The size of the pressure cycle effects of gravity circulation hot water heating system depends on the situation of the changes in water temperature in the recirculation loop .
3. Many factors affecting the radiator heat transfer coefficient : the manufacturing of the radiator and radiator conditions of use , all affect the thermal performance of the radiator .
Lesson 6
gas is generally divided into four categories: gas field gas from gas wells or pure gas ; along with oil along mined liquefied petroleum gas (LPG) , also known as petroleum associated gas ; gas condensate field gas with oil and light distil