Condenser cooling water for a power plant is stored in a cooling pond that is 1000m long by 500m wide. However, because of evaporative losses, it is necessary to periodically add "makeup" water to the pond in order to maintain a suitable water level. Assuming isothermal conditions at
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- 7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?arrow_forwardDetermine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.arrow_forward5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.arrow_forward
- solve show all solutions and assumptionsarrow_forwardNonearrow_forwardAir flows hydrodynamically and thermally fully developed at an average speed of 0.5 m/s through a thin-walled pipe with a diameter of 2.5 cm. Air can be heated in two different ways. In the first, the air can be heated at a constant surface temperature by means of a steam from the outside of the pipe, and in the second with an electric heater (thus providing a constant heat flux). Calculate the heat convection coefficients for both heating methods. According to this; Given: Properties of air at 350°K: υ= 20.76.10-6 m2/s, k =0.03 W/mK, Pr=0.70arrow_forward
- i need the answer quicklyarrow_forwardConsider a bullet piercing through calm air during a short time interval in which the bullet’s speed is nearly constant. Determine if the time-averaged airflow over the bullet during its flight is one-, two-, or three-dimensionalarrow_forwardI need the answer as soon as possiblearrow_forward
- Air stream at 1 atm flows with a velocity of 2 m/s, in parallel over a 3 m long square flat plate, placed on ground, where there is an unheated starting length of 1 m. The air stream has a temperature of 20 °C and the heated section of the flat plate is maintained at a constant temperature of 80 °C. Determine the local heat transfer coefficient at trailing edge and average convection heat transfer coefficient for the heated section. Also calculate the heat loss by convection. Determine the average friction coefficient and wall shear stress and drag force.arrow_forwardA 15 cm x 15 cm circuit board dissipating 15 W of power uniformly is cooled by air, which approaches the circuit board at 20°C with a velocity of 5 m/s. Disregard any heat transfer from the back surface of the board and evaluate properties of air at 300 K. Assume the flow to be turbulent across the entire length of the board since the electric components will have tripped the boundary layer. (a) Determine the surface temperature of the electronic components at the leading edge of the board, and (b) at the end of the board. (c) Ideally, at what temperature would the properties of air be evaluated at?arrow_forwardExperiments have been conducted on a metallic cylinder 12.7 mm in diameter and 94 mm long. The cylinder is heated internally by an electrical heater and is subjected to a cross flow of air in a low-speed wind tunnel. Under a specific set of operating conditions for which the upstream air velocity and temperature were maintained at V = 10 m/s and 26.2°C, respectively, the heater power dissipation was measured to be P = 46 W, while the average cylinder surface temperature was determined to be T, = 128.4°C. It is estimated that 15% of the power dissipation is lost through the cumulative effect of surface radiation and conduction through the endpieces. Thermocouple for measuring airstream temperature Pitot tube for determining velocity Wind tunnel Power leads to electrical heater Heated cylinder Insulated endpiece Thermocouple leads 1. Determine the convection heat transfer coefficient from the experimental observations. 2. Compare the experimental result with the convection coefficient…arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning