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Problem 6.38:
The refrigeration cycle in Figure 6-21 shows a vapor compression cycle with recirculation. The vapor-liquid separator after the throttling valve recycles the vapor to the compressor and passes the liquid to the evaporator. This process uses the refrigerant R-134a with the evaporator temperature set at - 20 °C, the condenser at 30 °C, and with compressor efficiency of 75%. Determine the energy and entropy balances and compare the efficiency of this process to the simple vapor-compression cycle without recirculation.
Derive an equation for the latent heat of fusion that is a function of the radius of the particle. Using this equation, for a copper particle that has a radius of 2.5 nm, find the ratio of the latent heat of fusion of the particle to the laten..
A 30.0 liter cylinder of a gas containing 97.0 mole% CO and 3.0% CO2 is delivered to your plant. The gauge on the tank reads 2000 psi. Several days later, the gauge reads 1875 psi, indicating a leak. The storage room in which the cylinder is kept has..
Assume that an ordinary mercury-in-glass thermometer follows first order dynamics with atime constant of 10s. It is at a steady state temperature of 0°C. At time t = 0, the ther mometeris suddenly immersed in a constant temperature bath at 100°C.
the path followed by a fixed amount of a perfect gas during a reversible process is described by the following
Cite the indices of the direction that results from the intersection of each of the following pair of planes within a cubic crystal:
In a specific rectification process , operating on ethanol and water mixtures, the vapor and liquid streams entering and leaving the column are those given in the table ethanol water mole% moles liquid entering top 75.1 24.9 liquid leaving bottom ..
The ship must unload 1000 metric tons within 5 hours to avoid demurrage charges. Estimate the power required by the pump. Take the pump efficiency as 70%. Physical properties of toluene: density 874 kg/m3, viscosity 0.62 mNm-2 s.
calculate the maximum analog output voltage
Explain why the value of the normalized ratio (R) in a pulse oximeter is independent of the volume of arterial blood entering the tissue during systole.
Draw a one-line diagram of this three-phase distribution system.
Neglecting stator resistance and rotational and stray-load losses, and assuming constant rotor resistance, calculate the starting torque and the maximum torque in per-unit of full-load torque, as well as the slip at which the maximum torque occurs..
Why does Al as (Al sheet) react with HCl and Al as (Al foil) not react with HCl? and why do they both not react with a weak acid?and why does steel neither react with a weak nor a strong acid?
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