“A pipe is carrying hot water through a cold storage facility. The ambient air in the cold storage has temperature of ?5?C. To maintain uniform temperature in the cold storage, blowers installed in the facility induce a 3 m/s velocity to the cold air (which can be assumed to be flowing across the water pipe). Hot water inside the pipe has a mean velocity of 0.5 m/s. The internal and exter- nal diameter of the pipe are 8.4 cm and 10 cm. The effective thermal conductivity of the pipe material is 60 W/m?C. The mean temperature of the hot water in the pipe entering the cold storage is 50?C. Also assume that the water flow is fully developed. Neglect radiation. For the purpose of convection coeffi- cient calculations, assume the bulk-mean temperature of hot water to be same as inlet mean temperature (50?C) and the outer surface temperature of the pipe is very close to the bulk mean temperature of water.”
(a) Calculate the Grashof number and show whether the use of a forced convection correlation was appropriate for evaluating external convection
(b) Assume that the surface and mean temperatures remains same. Assume the emissivity of the pipe surface is 0.5. If instead of 3 m/s air the cold storage was quiescent, what is the rate of heat transfer from a 10-m long section of the pipe to the atmosphere?.
“A pipe is carrying hot water through a cold storage facility. The ambient air in the...
a pipe carrying hot water and another carrying cold water are buried underground such that the two pipes are parallel to each other. The distance between the pipes is 500 mm and the thermal conductivity of the soil is 0.05 W/m K. the outer diameter of the hot water pipe is 10 cm and that for the cold water pipe is 7.5 cm. The surface temperatures of the pipes are 175C and 5C respectively. Determine the heat transfer rates between...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
5. A hot stainless sphere (D-10 cm) is cooled by quiescent ambient air at 27 °C. Please find the convection and radiation heat transfer when the steel sphere surface temperature is 127 °C, and 77 °QC respectively.
Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
Hot water with the mass flow rate of 3 kg/s and temperature of 90 Centers a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe.
Hot water with a mass flow rate of 3 kg/s and a temperature of 90 degrees Celsius enters a 2-inch copper pipe with a length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of the water and the rate of heat loss from the pipe.
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe.
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe.
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe.