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)

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.