Chapter 7, Problem 7.55P

An ideal single stage air compressor without clearance takes in air at 105KPa with temperature of 15degC and delivered it at 413KPa after isentropic compression. What is the work done by the compressor in KJ/kg?

A nozzle receives an ideal gas flow with a velocity of 25 m/s, and the exit at 100 kPa, 300 K velocity is 250 m/s. Determine the inlet temperature if the

I need help on the following question: The vapour compression cycle (picture provided), utilises the refrigerant R134a flowing at 0.05 kg s-1. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, then: 1. You need to determine the theoretical input power to the compressor and the heat transfer (Φ) to theevaporator. Take the enthalpies h1, h2, and h3 to be 238.41, 263.68 and 81.5 kJ kg-1 (use the 'NH3 Refrigeration Table' where you can find online). 2. You need to determine the coefficient of performance based on your answer to the previous question (1). 3. You need to determine the compressors mechanical efficiency.

Problem: Steam enters a condenser tube at 300 kPa and 82% quality. It is cooled by air to 30°C and 300 kPa. The air enters the condenser's tube bundle at 100 kPa, 20°C and leaves at 95 kPa, 50°C. Heat is transferred to the surroundings at a rate of 30 kJ/s. Find the mass flow rate of steam? Air Ú3 = 10 m/s %3D P3 100 kPa Steam T3 20°C - Q=30 kJ/s P = 300 kPa %3D 82% quality P2 = 300 kPa T2 = 30°C P4 = 95 kPa T = 50°C %3!

A 3-stage air compressor compresses air from 100kpa to 700kpa. Find the intercooler pressure between the 2nd and 3rd stage.  ANSWER: 365.88 kpa

Consider Air “with constant specific heats at room temperature" enters a compressor at 100 kPa, 27°C and leaves at 520 kPa and 227 °C, the compressor experiences a heat loss of 22.3 kJ/kg to the surroundings which are at 22°C. What is the entropy generation (kJ/kg.K)?

Define the Reversible Isothermal Compression

Q2: 26 tons of ice from and at 0°C is produced per day in an ammonia refrigerator. The temperature range in the compressor is from 26°C to -15°C. The vapour is dry and saturated at the end of compression. Assuming actual COP is 62% of theoretical, calculate the power required to drive the compressor. Take latent heat of ice 335 kJ/kg.

Steam engine isentropically expands 8.019kg/s of steam from 0.68 MPa, 220 degree celcius. The exhaust is dry and saturated. Determine the work in steady flow process in kW.