2. An R22 standard refrigeration system carries a refrigerating load of 82 kW. The suction and discharge pressures of the compressor are 354.3 kPa and 1460.1 kPa respectively. The liquid refrigerant is subcooled by 4° before entering the expansion valve and the vapor is superheated by 5° before entering the compressor. The twin- cylinder, single-acting efficiency, 82%; clearance volume, 6%; and mechanical efficiency, 78% Determine compressor operates at 1680 rpm; stroke-to-bore ratio, 1.20; actual volumetric (a) mass flow rate of refrigerant in kg/s (b) mass flow rate of refrigerant per ton of refrigeration in kg/s-ton (c) work on compressor in kW (d) work on compressor per ton of refrigeration (e) coefficient of performance (f) condenser load in kJ/s (g) volume capacity of compressor in L/s (h) compression ratio (i) clearance volumetric efficiency in % G) bore and stroke of compressor in mm (k) power of motor to drive the compressor 12 answers 3. Determine the effects of problem 2 on the following (a) coefficient of performance (b) work on compressor per ton of refrigeration 2 answers

Wielding is the only method of joining to ferrous metals together to make a permanent connection. True or false

What is a standpipe?

Question Two: The crank shaft of an engine runs at 2400 rpm. If it takes 0.002 second after ignition for the charge to gain maximum pressure, what should the crank angle be when spark occurs. If the inlet valve opens 12° before T.D.C. and closes 43° after B.D.C. for how long is it open during one cycle?