Troubleshooting Challenge 410A
bumity is 60.7%
Indoor dry bulb temp 80°F Indoor wet bulb temp 70°F
Refrigerant R410A
Outdoor ambient temp 89°F hot
Suction line temp 75°F
Liquid line temp 128ºF
Actual Condensing pressure 485 PSIG (131.1 °F)
Actual Evaporator pressure 144 PSIG (50.33 °F)
Diagnose the problem (Only one)
Low Evaporator Airflow (Low load)
Refrigerant Undercharged
Refrigerant Overcharged
High heat load (High Indoor Temperature or Leak in return duct)

On a average work day more than work place firs are reorted

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg. k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m. k