Chapter 8, Problem 8.5P

A new air turbine is required for a dentist's drill. For the drill bit to be effectively abrade tooth enamel the turbine be rotate at high speed of 400000rpm. The turbine design must be small and flexible according to precision engineering so that all parts of the patient's mouth can be access and the exit air flow rate from the system is 14 L/min is needed for proper operation. The operating pressure and temperature to drive the turbine is 5 bar and 400 K. Calculate: 2.1 The specific speed of the turbine and use the specific speed from the turbine and determine the type of turbo machinery required by the system. 2.2 Determine the power used by the turbine during operation and account how this power is used during operation.

(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.

3. A single acting reciprocating compressor is needed to compress 100 kg of air per hour from 100 kPa and 25 deg Cintake condition to 900 kPa delivering pressure. The compression is expected to follow PV to the power 1.25 = C. If the compressor has a clearance factor of 4% and it is expected to operate at 300 rpm, what is the required piston displacement?

Please use the appropriate format in answering word problem: Problem 02 A sports car having a compression ratio of 10 : 1. The intake air is at 100 kPa = 1 bar, 30 °C, and the volume of the chamber is 500 cm³ prior to the compression stroke. The temperature at the end of adiabatic expansion is T4 = 900 K. Find its thermal efficiency assuming Otto cycle

A single stage single acting reciprocating air compressor has 0.25 m x 1.75 m runs in 750 rpm is to deliver 0.20m³ free air per second from 101.3 kPa to 355 kPa. Calculate (a) the volume displacement (b) the volumetric efficiency (c) the isothermal work done, compression is at pV =c (d) the isothermal compressor efficiency if the the indicated power of compressor is 40kW

COMPLETE SOLUTION. FINAL ANSWER ARE IN ENGLISG SYSTEMS. DRAW A DIAGRAM IF NECESSARY. Derive the thermal efficiency of Carnot cycle in terms of its compression ratio “rk”. Show your complete solution and make sure to include a brief explanation.

A four-stage single-acting air compressor running in an atmospheric at 87 kPa and 15°C has a F.A.D of 2.83 m³/min. The section pressure and temperature are 80 kPa and 32 °C respectively, the delivery pressure is to be 7 MPa. The temperature at the start of compression in each stage is 32 °C, take n=1.3  for all stages. calculate: 1. The intermidiate pressure ratio 2. The intermidiate pressure at first, second and third stages in kPa

A four stage single acting air compressor running in an atmospheric at 87 KPa and 15 degrees Celsius has a free air delivery of 2,83 m³/min. The section pressure and temperature are 80 KPa and 32 degrees Celsius respectively, the delivery pressure is to be 7 MPa. The temperature at the start of compression in each stage is 32 degrees Celsius, take n=1,3 for all stages. Calculate 1.the mass flow rate to 3 decimal place in kg/min 2. The power input in KW to 1 decimal place

The steam rate to a turbine for variable output is controlled by a throttle valve in the inlet line.Steam is supplied to the throttle valve at 1,700 kPa and 225°C. During a test run, the pressure atthe turbine inlet is 1000 kPa, the exhaust steam at 10 kPa has a quality of 0.95, the steam flowrate is 0.5 kg/s, and the power output of the turbine is 180kW. 1. What are the heat losses from the turbine? 2. What would be the power output if the steam supplied to the throttle valve were expandedisentropically to the final pressure?