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Example 6.21: Household Refrigerator
Estimate the maximum coefficient of performance of a household refrigerator.
Example 6.22: Ammonia Refrigerator
Design a vapor compression cycle using ammonia as the refrigerant that will be used to maintain the temperature of a stream at - 20 °C. The evaporator is air cooled and the ambient temperature may be assumed to be 25 °C. Assume a compressor efficiency of 80% and allow for 2 °C of temperature difference between streams in the evaporator and condenser for practical heat transfer.
Two moles of benzene are mixed with 3 moles of acetonitrile under constant temperature and pressure at 45 °C and 33 kPa. What is the phase of the mixture (vapor, liquid, or mixed)?
If the generated emfs are 200 and 210 V, respectively, determine the load voltage and the armature current of each machine.
A 2014 Toyota Prius has a drag coefficient of Cd at road speed, using A m2 as the reference area. Determine the horsepower required to overcome drag at a velocity of v m/s. Calculate the answer if Cd= 0.26; A= 2.33m2 and v=30 m/s. Compare this fig..
Consider the following information: i. The layer of dead skin on our bodies is sufficient to protect us from most -particle radiation. ii. Plutonium is an -particle producer. iii. The chemistry of Pu4 is similar to that of Fe3. iv. Pu oxidizes..
Calculate the maximum allowable particle size as a function of the bulk glucose concentrations of 5 g/ l and 50 g /l. For medium containing 30 g /l glucose, calculate Rmax at cell loading of 5 and 30 wt%.
how many units of x should the firm use?
Obtain an expression for the induced emf, assuming the angle θm is zero at t = 0 and θm = ωmt.
If the output voltage is to indicate increments of 0.1 V, find the bits that must be used.
Calculate the partial molar enthalpy of each component at x1 = 0.5, 25 °C, 1 bar. The reference state for each component is the pure liquid at 25 °C, 1 bar.
A Rankine power plant using steam operates between pressures 60 bar and 1.013 bar. The turbine expands steam from 500 °C, 60 bar, to 1.013 bar. The liquid at the exit of the condenser is saturated. The efficiency of the turbine and of the pump is ..
In the process of Example 6.2, the flow rte of streams 1′ and 2′ is made very high, while the state of streams 1, 2, and 1′ are the same as in the previous example. Repeat the calculation of entropy generation for these new conditions.
When burnt , the flue gas issuing out of the furnace at 545 oc analyses on dry basis as CO2 =14.5 % , O2 = 4.7%, N2 = 80.8 % , Other relevant data are- Gross C.V. of coal =28000 kj /kg , ambient temperature = 15oc
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