A hot dog can be considered to be a cylinder 5 in long and 0.8 in in diameter whose properties
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- An autoclave contains 1000 cans of pea soup. It is heated to an overall temperature of100C. If the cans are to be cooled to 40C before leaving the autoclave, how much coolingwater is required if it enters at 15C and leaves at 35C? The specific heats of the pea soupand the can metal are 4.1 kJ/kgC and 0.5 kJ/kgC, respectively. The weight of each can is60g and it contains 0.45 kg of pea soup. Assume that the heat content of the autoclave wallsabove 40C is 1.6x104 kJ and that there is no heat loss through the walls. Ans. 1,526.85 Kgarrow_forwardDiscuss the application of the first law of thermodynamics to a mountaineer who eats food, gets warm and perspires a lot during a climb, and does a lot of mechanical work in raising herself to the summit. The mountaineer also gets warm during the descent. Is the source of this energy the same as the source during the ascent?arrow_forward6.13 from A Heat Transfer Textbook fifth editionarrow_forward
- Chickens with an average mass of 2.2 kg and average specific heat of 3.54 kJ/kg·°C are to be cooled by chilled water that enters a continuous-flow-type immersion chiller at 0.5°C and leaves at 2.5°C. Chickens are dropped into the chiller at a uniform temperature of 15°C at a rate of 250 chickens per hour and are cooled to an average temperature of 3°C before they are taken out. The chiller gains heat from the surroundings at 25°C at a rate of 150 kJ/h. Determine the rate of heat removal from the chickens, in kW.arrow_forwardChickens with an average mass of 2.2 kg and average specific heat of 3.54 kJ/kg·°C are to be cooled by chilled water that enters a continuous-flow-type immersion chiller at 0.5°C and leaves at 2.5°C. Chickens are dropped into the chiller at a uniform temperature of 15°C at a rate of 250 chickens per hour and are cooled to an average temperature of 3°C before they are taken out. The chiller gains heat from the surroundings at 25°C at a rate of 150 kJ/h. Determine the rate of entropy generation during this chilling process.arrow_forwardIn many manufacturing plants, individuals areoften working around high-temperature surfaces.Exposed hot surfaces that can cause thermal burns on humanskin are considered hazards in the workplace. Metallic surfacesabove 70° C can instantly damage skin that touches them.Consider an AISI 1010 carbon steel strip (? = 7832 kg/ m 3 )2 mm thick and 3 cm wide that is conveyed into a chamber tobe cooled at a constant speed of 1 m/s. The steel strip entersthe cooling chamber at 597° C. Determine the rate at whichheat needs to be removed so that the steel strip exits the chamberat 47° C . Discuss how the conveyance speed can affect therequired rate of heat removal.arrow_forward
- A diffuser operating within a jet engine receives air at 230 K and 35 kPa with a velocity of 240 m/s.If the velocity of the air exiting the diffuser is negligible, what will the temperature of the air be at the exit? Tin = 230 KPin = 35 kPaVin = 260 m/sarrow_forwardStainless steel ball bearings (r = 8085 kg/m3, k =15.1 W/m·°C, cp = 0.480 kJ/kg·°C, and a = 3.91 * 10-6 m2/s) having a diameter of 1.2 cm are to be quenched in water. The balls leave the oven at a uniform temperature of 900°C and are exposed to air at 30°C for a while before they are dropped into the water. If the temperature of the balls is not to fall below 850°C prior to quenching and the heat transfer coefficient in the air is 125 W/m2·°C, determine how long they can stand in the air before being dropped into the water.arrow_forwardIn a ball bearing production facility, steel balls (k=50 W/m.K, c=0.460 kJ/kg.K, ρ=7865 kg/m3) that are each of 13,99 mm in diameter are annealed by first heating them to 870 oC and then slowly cooling in air to 125 oC. If the cooling air stream temperature is 60 oC, and it has a convective heat transfer coefficient of 35 W/m2.K), determine the time [s] required for the cooling.arrow_forward
- THERMOFLUID A 4-in X 5-m X 7-m room is heated by the radiator of a steam-heating system. The steam radiator transfers heat at a rate of 10.000 kJ/h, and a 100-W fan is used to distribute the warm air in the room. The rate of heat loss from the room is estimated to be about 5000 kJ/h. If the initial temperature of the room air is 10°C, determine how long it will take for the air temperature to rise to 20°C, Assume constant specific heats at room temperature.arrow_forwardA long roll of 2-m-wide and 0.5-cm-thick 1-Mn manganesesteel plate (ρ = 7854 kg/m3 and cp = 0.434 kJ/kg·°C)coming off a furnace at 820°C is to be quenched in an oil bathat 45°C to a temperature of 51.1°C. If the metal sheet is movingat a steady velocity of 10 m/min, determine the requiredrate of heat removal from the oil to keep its temperature constantat 45°C.arrow_forwardHOW MUCH HEAT IS NEEDED TO COMPLETELY VAPORIZED 100 KG OF ICE AT -10 C IF THE PRESSURE IS HELD CONSTANT AT 200 KPA. LATENT HEAT OF FUSION AT 200 KPA IS 320 KJ/KG. LATENT HEAT OF VAPORIZATION AT 20 KPA IS 2202 KJ/KGarrow_forward
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