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A vapor-compression refrigeration system operating continuously is being considered to provide a minimum of 80 tons of refrigeration for an industrial refrigeration maintaining a space at 2oC. The surroundings to which the system rejects energy by heat transfer reach a maximum temperature of 40oC. For effective heat transfer, the system requires a temperature difference of at least 20oC between the condensing refrigerant and the surroundings and between the vaporizing refrigerant and the refrigerated space. The project manager wished to install a system that minimizes the annual cost for electricity (monthly electricity cost is fixed at 5.692 cents/kWh for the first 250 kWh and 6.006 cents/kWh for any usage above 250 kWh). You are asked to evaluate two alternative designs: a standard vapor compression refrigeration cycle and a vapor-compression refrigeration cycle that employs a power-recovery turbine in lieu of an expansion valve. For each alternative, consider three refrigerants: ammonia, R-22 and R-134a. Based on electricity cost, recommend the better choice between the two alternatives and a suitable refrigerant. Other than electricity cost, what additional factors should the manager consider in making a final selection? Prepare a written report and presentation including results, conclusions and recommendations.
at steady state moist air at 42c 1 atm 30 relative humidity is mixed adiabatically with a second moist air stream
Answer the following true or false. Explain. (a) Exergy is a measure of the departure of the state of a system from that of the exergy reference environment.
the velocity in a two-dimensional flow field is given by the equation v i2xt - j2yt where the velocity is in ms when x
a 4.53 kg mass attached to the lower end of a spring whose upper end is fixed vibrates with a natural period of 0.45
1- Increasing and decreasing functionsQuestion: Find the interval in which the function is increasing and decreasing?
What is minimum radius of level curve that the wagon can negotiate at this speed without overturning?
two previously undeformed cylindrical specimens of an alloy are to be strain hardened by reducing their cross-sectional
determine the actual and minimum theoretical operating costs, each in $/day.
the spherical gas tank is fabricated bynbspbolting together two hemispherical thinnbspshells of thickness 30 mm. if the
Atmospheric air enters at 1 atm with a dry-bulb temperature of 70°F and a wet-bulb temperature of 60°F. Saturated air exits at 110°F, 1 atm. Ignoring kinetic and potential energy effects, determine the mass flow rate of the cooled water stream exi..
If the built-up beam is subjected to an internal moment of 75 kn*m, determine the maximum tensile and compressive stress acting on the beam
a 50 kg crate resting on a flat smooth surface is acted upon by a horizontal force that varies by the equation f1.5x
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