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D Question 2 1 pts Hot and cold water pipes 8 m long run parallel to...
a pipe carrying hot water and another carrying cold water are buried underground such that 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...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatu...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of...
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...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
“A pipe is carrying hot water through a cold storage facility. The ambient air in the...
“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...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water a...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and is cooled by a cold water stream of flow rate 25 kg/min. The inlet temperatures of hot and cold water streams are 70 oC and 25 oC, respectively. The outlet temperature of the hot water is expected to be 50 oC. The individual convective heat transfer coefficient on both sides of the heat transfer area is 600 W/m2 .K. Take the specific heat for...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
Cold water with properties as shown in Table 4 flows at rate of 4 kg/s is...
Cold water with properties as shown in Table 4 flows at rate of
4 kg/s is heated from 28 oC to 54 oC in a shell-and-tube heat
exchanger as shown in Figure 4.The cold water inters the tubes
through thin-walled tubes, each tube has diameter of 19 mm, and the
average velocity inside each tube is 0.355 m /s. The shell side,
one pass is used with hot water as the heating fluid 1.8 kg/s
entering the exchanger at 93...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
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...
1.3 127 5.3 3.(10 pts) A cold storage room (10 m x 10 m x 10 m) is being maintained at 2 °C using a vapor compression refrigeration system that uses R-134a. The evaporator and condenser temperatures are -20 and 40°C, respectively. The walls and ceiling of the storage room is constructed of 15 cm thick concrete (thermal conductivity-1.37 WIm K]) and 4.3 cm thick insulation (thermal conductivity-0.04 W/[m K). The outside insulation surface temperature of the walls (or ceiling)...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
3) A rectangular HVAC duct of cross-section 20 cm X 20 cm and 12 m long is made of 3.5 mm thick sheet metal that is used to deliver hot air at 60°C with an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.305, is exposed to the cold air at 10 C in the room, with a convection heat transfer coefficient of 10 W/m²....
Cold water with properties as shown in Table 4 flows at rate of
4 kg/s is heated from 28 oC to 54 oC in a shell-and-tube heat
exchanger as shown in Figure 4.The cold water inters the tubes
through thin-walled tubes, each tube has diameter of 19 mm, and the
average velocity inside each tube is 0.355 m /s. The shell side,
one pass is used with hot water as the heating fluid 1.8 kg/s
entering the exchanger at 93...
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