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A refrigeration system is to cool bread loaves with an average mass of 450 g from 22 to -10°C at a rate of 500 loaves per hour by refrigerated air at -30°C. Taking the average specific and latent heats of bread to be 2.93 kJ/kg · °C and 109.3 kJ/kg, respectively, determine
(a) the rate of heat removal from the breads, in kJ/h;
(b) the required volume flow rate of air, in m3/h, if the temperature rise of air is not to exceed 8°C; and
(c) the size of the compressor of the refrigeration system, in kW, for a COP of 1.2 for the refrigeration system.
Determine the tube length L that meets a design requirement that the tube be twice as long as the thermal entrance length associated with the high- est Reynolds number of interest. Evaluate water properties at 305 K.
Impact and Motion Figure 2.68 illustrates a carriage with mass M that has an oblique surface. The carriage can move frictionless on the ground. We drop a small ball of mass m on the surface when the carriage is at rest.
Describing the potential electronic commerce aspects related to the development of the Kudler Fine Foods Frequent Shopper Program
a skydiver jumps from a ballon and falls freely for 6 seconds. her parachute then opens decelerating her at a constant
A Wilson-Hartnell governor is illustrated in given Figure. In this, the balls are associated by two springs that are known as main springs. The main springs are symmetrically arranged on either side of the sleeve.
Find the moment of inertia of the system about an axis perpendicular to the rod passing through its middle point
Find the velocity of the bullet and block just after impact.
a pulley of moment of inertia i is fixed on a shaft of polar second moment of area j and shear modulus g. the shaft is
A certain industrial process requires a steady 0.75 kg/s supply of compressed air at 500 kPa, at a maximum temperature of 30C. This air is to be supplied by installing a compressor and after cooler. Local ambient conditions are 100 kPa, 20C.
Casting can be used to make a sphere. But is there any chance we can machine it to proper surface tolerances ?
1. a commercial refrigerator keeps food fresh at -12 ordmc. it is estimated that the refrigerator removes 3300 kjhr
a shell-and-tube heat exchanger is to heat an acidic liquid that flows in unfinned tubes of inside and outside
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