Chapter 8, Problem 8.71P

An air compressor is to compress 510m /hr from 100kpa to 10bar, for an ideal compres n=1.3, what will be the percent saving in power due to two staging?

Q8: In Kaplan reaction turbine produces (70kW) at (370 r.p.m). The hub and tip diameter are (0.4m and 0.8m) respectively. The flow velocity is (2.8 m/s), find peripheral velocity and discharge.

Please read the problem and solve what is asked. Thanks! A two-stage compressor with an ideal intercooler receives 0.5m3/s of Helium at 150kpa and 300K and discharges it at 7500kpa. Find the heat rejected(kw) at the intercooler.   Ans. 27.015 kw

2. An air compressor is to compress 510m²/hr from 100kpa to 10bar, for an ideal compression with n=1.3, what will be the percent saving in power due to two staging?

A single-stage single acting air compressor takes air in at 1 bar & delivers at 7.5 bar. Work done by the compressor is 38 kJ and the compressor runs at 150 rpm. Calculate the power required in kW/?     the power required in kW?

Q3// An axial flow compressor, with compression ratio as 5, draws air at 20°C delivers it at 50°C. Assuming 50% degree of reaction, find the velocity of flow if the blade velocity is 100 m/s. Also find the number of stages. Take work factor-0.85, the exit and inlet angles for both the moving and fixed blades are 10° and 40° respectively, c₁=1 kJ/kg.K.

2A steam throttiing valve with iniet conditions of 2MPa and 400C is connected to the inlet of the turbine. The turbine has 200kW power output and heat abstracted of 100KW. If the mass fiow rate is 1kgis and the exit temperature of steam is 300C, find the exit turbine pressure.

Q 2: - A one cylinders Freon (134a) compressor has a Bore and Stroke 5.4 and 4.8 cm respectively. It is speed 1450 rpm volumetric efficiency c.v 100% working fluid reaches expansion valve at 42°C and the temperature %3D of its suction -8°C:- a- Find the mass flow rate of the refrigerant, heat capacity and COPact& COPtho? b- Find the mass flow rate of the refrigerant, heat capacity and COP & COPtho if the clearance factor will be 5%?

(a) What would be the necessary bore and stroke of a single acting four- cylinder, 350 rpm ammonia compressor working on simple saturation cycle between 35°C condenser and -15°C evaporator temperatures and developing 15 tons refrigeration. Given for the compressor: Ratio of stroke to bore = 1 Volumetric efficiency = 0.7 (b) If the index of compression is 1.15, find the error introduced in calculat- ing the work of compression by assuming the process to be isentropic. Also, find the heat rejected to the compressor-jacket cooling water.