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A heat pump has heat-transfer addition at 280 K and heat transfer out at 420 K, and the heat-transfer rate out at 420 K is 900 kJ/min. For each case below, determine from both the Clausis inequality and the Carnot principle for a heat pump whether the cycle is reversible, irreversible or impossible.
a. QL=580 KJ/min
b. W=280 KJ/min
c. QL=600 KJ/min
18 ft3/s of air at 80oFenters a compressor at a pressure of 14.7 psi. The air leaves at a pressure of 90 psi. Heat loss from the compressor occurs at a rate of 9.7 Btu per lbm of air flowing through the compressor. If the compressor requires 90 hp, w..
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
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Calculate the vacancy concentration in aluminum at 50%, 70%, and 90% of TMP=923 K. Gvf = 0.66 eV, and k = 8.62 x 10-5 eV/K. Calculate ln (nv/N) and 1/T, and plot on a linear scale (hint: should be a straight line).
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Consider 0.8 grams of air (which may be assumed to be an ideal gas) at 295 K and 1.5 bar trapped in a rigid tank. An electrical heater is operated for 30 seconds. During this time the voltage across the heater is 12 V and 0.6 amps pass through the re..
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air is considered as an ideal gas. dont use gas table for gas properties just assume that both cv and cp are constants.
a given liquid has a temperature 178 celcius at a pressure of 47 mpa. if the enthalpy of the saturated liquid at the
A two-dimensional reducing bend as shown is used to control flow rate and direction of flow in a home air conditioning duct. In the reducing bend shown, there is a linear velocity profile at section (1). The flow is uniform at sections (2) and (3). T..
an air-standard otto cycle has a compression ratio of 7.5. at the beginning of compression p1 85 kpa and t1 305 k.
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