D.J. LYNCH & ASSOCIATES
1.) A duct 3ft X 2ft X 100 feet long runs through a room where the temperature of the room is 90 degrees F. The air inside the duct is 55 degrees. The duct is insulated with 1/2 thick insulation board. Figure the heat gained by the air in the duct. (Show all math and formulas.)
2.) A theater seats 700 people. Find the sensible and latent heat gains from audience during an evening show. (Show math and formulas.)
3.) A conditioned room has (3) 3 horsepower motors in the motor driven equipment. Find the heat gain from the 81% 3 phase efficient motors. (Show math and formulas.)
4.) A restaurant has the following electric burning equipment in the dining room.
(3) 40 quart coffee brewers, and (1) food warmer, with 288” of top surface. None of the equipment has hood exhausts. Find the sensible and latent gains from this equipment into the dining room.
(Show math, tables, and formulas.)
5.) A room has (6) wood sash weather-stripped windows. Each window measures 2’ X 4’. The room is 78 degrees DB and 50% RH when the outdoor air is 95DB with 60% RH. The entire crack is leaking into the room. Find the sensible and latent heat gains from infiltration. The wind speed is 7 ½ MPH.
(Show formulas, math, and tables.)
6.) A hotel conference room seats 125. How much outdoor air should be introduced for ventilation. (Show math, formulas, and tables.)
7.) A theater is maintained at 78DB and 65WB when the outdoor conditions are 95DB and 76WB. The theater seats 850 people. Smoking is prohibited. Find the load on the A/C from 8CFM per person for ventilating air. (Show math, formulas, and tables.)
8.) A small department store will have 80 people inside on a busy day. The store is maintained at 75DB and 66WB when the outdoor air is 95DB and 75WB. How much air should be used for ventilation purposes? How much of a cooling load is on the A/C equipment, and include the people load.
(Show math, formulas, and tables.)
9.) Find the total conduction heat gain through a wall with the following data:
Wall is constructed with 12" common brick with 5/8" Sand plasterboard on the inside wall.
The wall measures 40’ X 9'. The room temperature is 75 degrees and the outside temperature is 95 degrees. (Show math, formulas, and tables.)
10.) Find the total conduction heat gain through the floor above an unconditioned space with the following data: Floor Construction: Sub floor (25/32 with felt) hardwood 3/4 inch thick, with the ceiling below metal lath with 3/8 " thick plaster (sand agg). The unconditioned room is a kitchen. Square feet are equal to 544. Winter Conditions! (Show math, formulas, and tables.)
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