Chapter 6, Problem 6.60P

The pressure inside a diesel engine cylinder is 20 kPa, find the work done if the volume changes from 3.5 m3 to 5.0 m3.

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Q1. A vapour compression refrigeration uses R-12 as a refrigerant and the liquid evaporates in the evaporator at - 15°C. The temperature of this refrigerant at the delivery from the compressor is 15°C when the vapour is condensed at 10°C. Find the C.O.P. if (i) there is no under cooling (ii) the liquid is cooled by 5°C before expansion by throttling. Take specific heat at constant pressure for the superheated vapour as 0.64KJ/kg k. and that for liquid as 0.94KJ/kg k the other properties of refrigerant are as follow: a) Temperature b) 0°С с) Enthalpy(KЈK)) d) Entropy(KJ/kg k) e) liquid _j) 22.3 0) 45.4 f) Vapour k) 180.88 g) liquid 1) 0.0904 9) 0.1750 h) Vapour m) 0.7051 i) -15 n) 10 p) 191.76 r) 0.6921

A rigid insulated tank is separated into two rooms by a stiff plate. Room A of 0.5 m3 contains air at 250 Kpa, 300 K and room B is 1 m3 has air at 200 Kpa, 1000 K. the plate is removed and the air comes to a uniform state without any heat transferred. find the final temp and pressure of the room. An ideal gas is 45 psig and 800F is heated in a closed container to 130 0F. What is the final pressure? An air bubble rises from the bottom of a well where the temperature is 25 0C, to the surface where the temperature is 27 0C. Find the percent increase in the volume of the bubble if the depth of the well is 5m. Atmospheric pressure is 101.528 kPaa. A 3000 cm3 tank initially contains compressed air at 600 kPag and 28 oC. Determine the mass of air to be withdrawn from the tank to reduce its pressure to 80 kPag while the temperature remains unchanged.

Q4 a- The pressure inlet for air compressor is 14 psi ,60 F and the output of 140 psi at 1080 R .This output passes through a cooler of constant pressure .if the exit air out of cooler is 540R find the specific work and specific heat of this compressor .use the table below in case.

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If heat engine is operating between 427 C and T temperature has the efficiency of 50%, find the value T in C.

A piston / cylinder contains 2 kg of air at 27 °C and 200 kPa. The piston is loaded with a linear spring, mass and the atmospheric pressure. Stops are mounted so that Vstop is 3m' at which the pressure is 600 kPa, see figure 2. The air is now heated to 400 kPa. Find the final volume and the work done. 2.

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