1. At an outdoor lot, there is a black-colored solar heat collection copper pipe. It is 50 meters...
A water heater consists of a copper tube that carries water through hot gas in a furnace, as shown in Fig. 1. hot gas at T, = 500° th=0.033 inch h, = 25 W/m2K Poytube = 0.25 inch water at Tv = 30° h = 500 W/m2K kube= 300 W/m-K Figure 1: Copper tube in a water heater. The copper tube has an outer radius, ro,tube = 0.25 inch and a tube wall thickness of th=0.033 inch. The conductivity of...
3. Heat Transfer Mechanism: (Total points 30 Suppose copper pipe in a parabolic concentrator is carrying heat transfer fluid (HTF) of 450 °C. The ambient temperature is 25 °C. The pipe has a diameter of 5 cm but the pipe wall thickness is 3 mm. Determine the rate of heat conduction through the pipe wall per unit area of wa Copper has thermal conductivity k-400 w/m.К. (Points 10) If the pipe temperature is same as that of fluid inside, calculate...
A wall panel is insulated on the back and exposed to solar radiation on the front surface. The exposed surface of the plate has an absorptivity α = 0.8 for radiation (i.e. 80% of radiant energy is absorbed). Solar radiation arrives to the panel at a rate of 1 kW⁄m2. The panel emissivity ϵ = 1 and the surrounding air temperature is 25°C. a. If we assume radiation is the only mechanism of heat transfer, in this scenario determine the...
a) what is the heat loss per unit length from the pipe in W/m? b) Estimate the heat loss per unit length if a 50 mm thick layer of insulation with a conductivity of 0.058 W/m K. Neglect radiation for this part. 3. A 0.20-m diameter, thin-walled steel pipe is used to transport saturated steam at a temperature of 486K in a room for which the air temperature is 25°C and convection heat transfer coefficient at the outer surface of...
Twenty [kw] of heat is to be removed from 375 [k] water flowing at 0.15 [kg/s] into the inner pipe of concentric tube heat exchanger. Cooling water enters the annulus at 290 [k] and leaves at 320 [k] with a flow in the opposite direction of the inner flow. The diameter of the thin- walled inner pipe is 2.5 [cm] a) b) c) Calculate the exit temperature of the hot fluid and the mass flow rate of the cold fluid...
Heat transfer 1 Normal 1 No Spac.. Heading 1 Heading2 Title Subt Paragraph Styles Heat Transfer - Assignment 1 An ideal gas is heated from 50 C to 80 C, (a) at constant volume and (b) at constant pressure. For which case do you think the energy required will be greater? Why? 1. 2. Consider a house with a floor space of 200 m2 and an average height of 3 m at sea level essure is 101.3 kPa. Initially the...
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...
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...
Fifty units in parallel of full tracking parabolic trough solar concentrator (PTC), is 1 m wide and 4 m long. A receiver suspended above the trough, consisting of a simple copper tube of 3.75 cm diameter coated with Ebanol-C (a = 0.9), which is covered with transparent Sunadex white crystal tube of 6 cm diameter (t = 0.915). The reflector is back silvered glass (p=0.9), If the PTC is operating with inlet and outlet temperatures of 70°C and 95°C respectively...
25 PRR HEAT TRANSFER NAME: UNIT SIX AND SEVEN EXCHANGERS BOILING AND CONDENSATION, He- Solve the following problems: 1. In a gas-faired boiler, water is boiler at 150 C by hot gases flowing through 59 m long, 5 cm outer diameter mechanically polished stailess-stell pipes submerged in water, If the outer surface temperature of the pipes is 180 °C. determine (a) the rate of heat transfer from the hot gases to water. (b) the rate of evaporation, (c) the ratio...