R1 = 2.2 mm k2 R2 Thickness =R2 -R1= 1.1mm Air R1 Velocity v = 4.51 m/s V= m/s kl Igen L= 111 %3D Air Properties: kair = 0.0263 W/m.K, Vair = 15.89 × 10-6 m²/s, Prair = 0.707 k2 = 1.23 W/m.K,
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- An office space contains one (6`x 3`) well- fitted door made of nominal 2" wood. The heat loss through door by infiltration is (3381 Btuh) if Tb.l.=80 F , To= -10 F , and Vwind=15 mph ? True or falseCalculate the U-value for the attic joists in the picture.Management: Ignore the post that supports the high leg.The composite layer is in the joist layer – 45×170 joists and 150 mm loose wool.The thin panel's layer can be considered an unventilated air gap 23mm, R= 0.16 m2K/W.Rsu = 0.13 m2K/W, for cold windRsi = 0.1 m2K/W, (inside) for roof Answer: 0.128 W/m2 · °CFind the minimum amount of diameter for the insulation of a spherical water tank? Radius of the tank is 10 m, thermal conductivity is 25 W/(m^2*K) and convective coefficient is 5 W/(m*K)
- 1. Most bridges contain interlocking steel grates (α steel = 1.2 x 10 - 5 ºC -1 ) that allow the bridge toexpand and contract with the changes in temperature. The Golden Gate Bridge in San Francisco isabout 1350 meters long.(A) The seasonal temperature variation in San Francisco ranges from about 0ºC to 30ºC. Howmuch will the bridge expand between these two extremes?(B) What percent of the length of a subcompact automobile, 2.5 meters, does this gaprepresent?2. Selena has a fire in her fireplace to warm her 20ºC apartment. She realizes that she hasaccidentally left the iron poker (α iron = 1.2 x 10 -5 ºC -1 ) in the fire. How hot is the fire if the 0.60-meter poker lengthens 0.30 cm?3. Just before midnight, when the air temperature of 10.0ºC, Karl stops and fills the 0.0600 m 3 gastank in his car. At noon the next day, when the temperature has risen to 32ºC, Karl finds a puddle ofgasoline (βgas = 3 x 10 -4 ºC -1 ) beneath his car.(A) How much gasoline spilled out of Karl's car?…A steam pipe carrying steam at 380 kPa pressure for a distance of 120 m in a chemical plant is not insulated. Estimate the Amount of heat saved if 16 cm steam line were covered with 85% magnesia pipe covering 5 cm thick. Take room temperature to be 36 ℃. Thermal conductivity of 85% magnesia is 0.0745 W/m−K , unit convective coefficient of room air, ho = 12 W m2−K .Take the steam temperature as 142℃. Use atleast 4 decimal places in every computationUrgent Please A sphere of diameter 10 cm with initial temprature 900C and h=600 w/m2k please provide all the parameters which satisfying condition and all also provide all possible situations on given data.
- 4. Data for a flat-plate collector used for heating are given below: Factor Specification Location and latitude Coimbatore 11° 00’ N Day and time 22 March, 14.30 — 15.30 (LST) Average intensity of solar radiaton ...560 W/m? Collector tilt ...26° No. of glass cover B Heat removal factor for collector ...0.82 Transmittance of glass ...0.88 Absorptance of the plate ...0.93 Top loss coefficient (U,) for collector ...7.95 W/m?°C Collector fluid temperature ...75°C Ambient tempeature ...25°C Calculate: (i) Solar attitude angle, (ii) Incident angle, and (iii) Collector efficiency. [Ans. 43.9°, 46.1°, 8.87%]A 10 kg axial load is uniformly carried by an aluminum alloy pipe with an outside diameter of 10 cm and an inside diameter of 9.6 cm. The pipe is 1.2 m long, Young's modulus for the aluminum alloy is 75 GPa. How much is the pipe compressed?Qigihar House in Heilongiiang Province, China Heat Loss Problems, BSCl 2101 Climate: Avg. remperature is 3.2°C Degree Days is 5000 Inside Air Temp. is 20°C Wall Construction, Inside to Out: 15mm Gypsum Plaster, Sand Aggregate Concrete Block, rectangular core, Sand and Gravi 15mm Cement Plaster, Sand Aggregate All 4 walls measure the same, 8m wide by 7mtall. The house is heated with electricity at a cost of $0.10kWh Calculate the RSI-total for the walls using the tabular method demonstrated in class, and the temperature drop through each element for the January 2.5% temperature. Calculate the rate of heat flow through the wall again for the January 2.5% temperature. Plot the temperature profile approximately to scale through a vertical cross-section of the wall. Calculate the January heating cost for the building. Calculate the annual heating cost for the building. Now add 2" ( 50.8mm ) of extruded polystyrene, smooth skin surface, 35kgm3 rigid insulation to the inside surfaces…
- Most automobiles have a coolant reservoir to catch radiator fluid that may overflow when the engine is hot. Such a radiator, made of copper, is filled to its 12-L capacity when at 10.0°C. -What volume of radiator fluid, in liters, will overflow when the radiator and fluid reach their 99.5°C operating temperature, given that the fluid’s thermal coefficient of volume expansion is 400.0 × 10-6 / °C? The coefficient of volume expansion for copper is 5.1 × 10-5 /°C.Subject : Thermofluid Question : A wind turbine four 10 cm diameter cups with a center-to-center distance of 40 cm, as shown in Figure 4. Due to a malfunction, the pivot is suddenly stuck, and the cups stop rotating. If the wind speed is 12 m/s moving at the described direction and air density is 1.25 kg/m3. Determine the maximum torque this turbine applies on the pivot.A modern cabin has a concrete floor that is 4.50 inches thick. Aroaring fire keeps the interior of the cabin at 21.0 0C while the airtemperature below the cabin is a chilly 2.00 0C. How much heat(J) is lost through the concrete floor in 4 hrs if the cabin measures4.50 m by 6.50m to 3 sig fig?