Q: Ethylene glycol is heated from 25°C to 40°C
Ethylene glycol is heated from 25°C to 40°C at a rate of 2.5 kg/s in a horizontal copper tube (k = 386 W/m⋅K) with an inner diameter of 2.0 cm and an outer diameter of 2.5 cm. A saturated vapor (Tg =...
See AnswerQ: This experiment is conducted to determine the emissivity of a certain material
This experiment is conducted to determine the emissivity of a certain material. A long cylindrical rod of diameter D1 = 0.01 m is coated with this new material and is placed in an evacuated long cylin...
See AnswerQ: A counterflow heat exchanger is stated to have an overall heat transfer
A counterflow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2â‹…K when operating at design and clean conditions. Hot fluid enters the tube side at 93&...
See AnswerQ: Liquid nitrogen is stored in a spherical tank of 1 m diameter
Liquid nitrogen is stored in a spherical tank of 1 m diameter where the tank surface is maintained uniformly at 80 K. The spherical tank is enclosed by a 1.6-m-diameter concentric sphere with uniform...
See AnswerQ: A thin-walled double-pipe counterflow heat exchanger is to
A thin-walled double-pipe counterflow heat exchanger is to be used to cool oil (cp = 2200 J/kg⋅K) from 150°C to 50°C at a rate of 2.5 kg/s with water (cp = 4180 J/kg⋅K) that enters at 22°C at a rate o...
See AnswerQ: Two concentric spheres of diameters D1 = 0.3 m and
Two concentric spheres of diameters D1 = 0.3 m and D2 = 0.6 m are maintained at uniform temperatures T1 = 800 K and T2 = 500 K and have emissivities ε1 = 0.5 and ε2 = 0.7, respectively. Determine the...
See AnswerQ: Reconsider Prob. 4–22E. Using appropriate software, determine
Reconsider Prob. 4–22E. Using appropriate software, determine the missing properties of water. Repeat the solution for refrigerant-22, and ammonia. Data from Prob. 4-22E: Complete t...
See AnswerQ: Reconsider Prob. 22–47. Using appropriate software, investigate
Reconsider Prob. 22–47. Using appropriate software, investigate the effects of oil exit temperature and water inlet temperature on the overall heat transfer coefficient of the heat exchanger. Let the...
See AnswerQ: A spherical tank of diameter D = 2 m that is filled
A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept in an evacuated cubic enclosure whose sides are 3 m long. The emissivities of the spherical tank and the enclo...
See AnswerQ: Cold water (cp = 4180 J/kg⋅K)
Cold water (cp = 4180 J/kg⋅K) leading to a shower enters a thin-walled double-pipe counterflow heat exchanger at 15°C at a rate of 1.25 kg/s and is heated to 60°C by hot water (cp = 4190J/kg⋅K) that e...
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