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A transmission case measures
If the transmission efficiency is
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Fundamentals of Heat and Mass Transfer
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- The drive is by V-belts from an electric motor running at 1500 r.p.m. A compressor, requiring 75000W is to run at about 500 r.p.m. The diameter of the pulley on the compressor shaft must not be greater than 1.2 meter while the centre distance between the pulleys is limited to 1.85 meter. The belt speed should not exceed 1500 m/min. Determine the number of V-belts required to transmit the power if each belt has a cross-sectional area of 3 cm2, density 1100 kg/m3 and an allowable tensile stress of 3 MPa. The groove angle of the pulley is 50°. The coefficient of friction between the belt and the pulley is 0.3. Calculate also the length required of each belt.arrow_forward..... A journal bearing for a pump has the following properties: Diametral clearance ratio = 0.0013 mm Diameter of journal = 90 mm Length of bearing = 160 mm Speed of journal = 900 rpm Lubricant viscosity = 0.02 kg/m-s Lubricant temperature = 60°C Ambient temperature = 15°C Bearing pressure in pump = 1.2 MPa Heat dissipation coefficient = 1,250 W/m2-°C Determine the amount of cooling (Qg-Qd) required in W.arrow_forwardOver the outside part of the room window, the wind is blowing with a speed of 10 m/sec. Due to this wind motion, the temperature on the outer surface of the window is 5 degrees lower than the room temperature. Determine the convective heat flux if the wind temperature is 10 C with a heat transfer coefficient of 10 W/(mK). Accept the temperature inside the room as 25 C. A) 200 W B) 100 W C) 200 W/(m^2) D) 100 W/(m^2) E) Not sufficient informationarrow_forward
- A long 8-cm diameter vertical steam pipe whose external surface temperature is 90 degrees C passes through some open area that is not protected against the wind blows. Determine the rate of heat loss from the pipe per unit length when the air is at 1 atm, 7 degrees Celsius and the wind is blowing across the pipe at a velocity of 50 km/h. From Table A-1:Thermal conductivity, k = 0.0275 W/m degrees Celsius ,viscosity, v = 1.77 x 10^-5 m^2/sPrandtl no. Pr = 0.71arrow_forwardThis is regarding Forced Vibrations and Ordinary Differential Equations.arrow_forwardOver the outside part of the room window, the wind is blowing with a speed of 10 m/sec. Due to this wind motion, the temperature on the outer surface of the window is 5 degrees lower than the room temperature. Determine the convective heat flux if the wind temperature is 10 C with a heat transfer coefficient of 10 W/(mK). Accept the temperature inside the room as 25 C. Not sufficient information 100 W 200 W/(m^2) 100 W/(m^2) 200 Warrow_forward
- The temperature of the flame in a furnace is 1277°C and the temperature of its surroundings is 277°C. Calculate the maximum theoretical quantity of heat energy radiated per minute per square meter to the surrounding surface area.arrow_forwardThe average temperature of the soil to a considerable depth is approximately 277.6 K (40°F) during a winter day. If the outside air temperature suddenly drops to 255.4 K (0°F) and stays there, how long will it take for a pipe 3.05 m (10 ft) below the surface to reach 273.2 K (32°F)? The convective coefficient is h = 8.52 W/m2 -K (1.5 BTU/h-ft2 -°F). The soil physical properties can be taken as 5.16 x 10–7 m/s (0.02 ft2 /h) for the thermal diffusivity and 1.384 W/m-K (0.8 BTU/h-ft-°F) for the thermal conductivityarrow_forward4. Data for a flat-plate collector used for heating are given below: Factor Specification Location and latitude Coimbatore 11° 00’ N Day and time 22 March, 14.30 — 15.30 (LST) Average intensity of solar radiaton ...560 W/m? Collector tilt ...26° No. of glass cover B Heat removal factor for collector ...0.82 Transmittance of glass ...0.88 Absorptance of the plate ...0.93 Top loss coefficient (U,) for collector ...7.95 W/m?°C Collector fluid temperature ...75°C Ambient tempeature ...25°C Calculate: (i) Solar attitude angle, (ii) Incident angle, and (iii) Collector efficiency. [Ans. 43.9°, 46.1°, 8.87%]arrow_forward
- In Rizal province, one of its power plants has been thoroughly monitored for possible conversion into a wind power plant. A propeller wind turbine is to be used. Survey showed that Rizal Province at a height of 10 meters above the ground has a minimum wind speed of 7.1 miles per hour duringthe month of June and a maximum wind speed of 12.9 miles per hour during the month of January. The minimum temperature is at 75 degree Fahrenheit during the month of January and maximum temperature is at 89 degree Fahrenheit during the month of May. The existing power plant has an output of 54MW. For the proposed wind power, the power coefficient of turbine is 35% and the generator efficiency is 95%. Theimpeller diameter is assumed not to exceed 90m. Determine the following:a. Theoretical Wind Power Outputb. Electrical Power Outputc. Number of turbines to be installedarrow_forward13.12 Fluid A is found to have a surface tension of 0.080 N m−1, a density of 1.2 × 103 kg m−3 and a contact angle of 70° with dry glass. Fluid B is found to have a surface tension of 0.100 N m−1, a density of 3.1 × 103 kg m−3 and a contact angle of 110° with dry glass. A glass capillary tube with an inner radius 1 mm is lowered into a container of fluid A and an identical capillary tube is lowered into a flask of fluid B. To what height above (or below) the fluid surface will fluids A and B rise in their respective capillary tubes?arrow_forwardImagine a plate 0.1 m long by 0.1 m wide at a temperature of 80 °C. Water is passed over its surface at a speed of 0.1 m/s and 40°C. Calculate the heat dissipated by the plate. Assume the following properties of water at 60 °C: k= 0.651 W/mK, Pr=3.02 y v = 0.478 x 10-6 m²/s.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning