Question

Question 1 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m2/s. Air leaves the coil at 40°C. a) What is the nature of this transformation? Find from the psychrometric chart the required rate of heat addition. n r Tables Vertical wall in wi Horizontal wall in contact with the ground (Hoor of a heated space, buried) all adjoining to an unheated room (garage, sh Wall in contact with the outside Space category contact with the ground (Cwall of a heated room, buried) าร ed, cellar) Table 1: ai coefficient with space category Colors and nature of the surface 0.4 White stone white, clear or cream surface very light Very clear surfaces cement single glazing double glazing triple glazing Glasses (windows or skylights) 0.9 0.8 Table 2: Absorption coefficient"a" for walls, roofs and windows U heat transmission coefficient of the F Solar radiation coefficient considered wall or window [W/m2 C 0 0.05 0.1 0.15 0.20 Table 3: Solar radiation factor F Proteeted windows Canvas exterior blinds Colors Aluminum 0.22 Table 4: Reduction factor "g" for protected windows Minimum fresh air Density of flowrate for smoking area [m3/h/persom Designation of the locals Minimum fresh air flowrate for non- smoking area [m3/h/person occupation person/m2] Page | 1 1/4 Omices an Mecting rooms, show ото Table 5: Air e rate resquu by type of locals power gain to admit tw) ization coefficient power [w Sensitive heatLatent UC (%) heat Stereophonic channel TV 175 175 Table 6: Power of devices in Watts Local (interior space) temperature Total heat Emission Activity Location IC) 25 °C 27 C LHE SHE LHE SHE 65 37 60 42 102 Sitting at rest theater 56 60 116 Light work Office, hotel, 67 49 apartment Stand up, slow Store, shop 68 63 57 74 131 valk Restaurant 84 64 97 161 eal Table 7: heat emitted from the body of an adult man (person) Connected power [W/m2) ature of the local and activity Incandescent Fluorescent lamp lamp

Answer 1

e nature thes trans Jomation is the Sensible heatn 勺