- 20 °C Wood siding Stud 130 mm Insulation Wall board 21 °C 40 mm Figure 1: The top view of the composite wall.
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- 2. Calculate the heat loss for the structure described below. Use the indoor design setpoint of 70°F. ● . . . ● ● Hint: Utilize the Q=U*A*(ti-to) & Q = U'*P*(ti-to). Make sure to reference the following tables and examples to help assist you solve this problem; Table 5-5a, Table 5-8, Table 5-4a, Example 5-3, Eq. 5-23, and Fig 5-8. Given: i. Location: Des Moines, IA @ 99% winter OAT ii. Walls: Table 5.7, Construction 2 iii. Floor: Concrete slab with 2-ft, R-5.4, vertical edge insulation iv. Windows: Double-Insulating Glass; 1/4-in. air space; e = 0.6 on surface 2, 3x4-ft, double hung, reinforced vinyl frame; three on each side v. vi. Roof-Ceiling: Same as Example 5.3, height of 8-ft vii. House Plan: Single story, 36-ft x 64-ft Doors: Wood, 1-3/4-in. panel doors with metal storm doors, three each, 3x6.75-ft Qwindows = Qdoors= Qwalls = Qroof/ceiling= Qfloor = QTOTAL = Btu/(hroft²0F) Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss Btu/h Heat Loss1.The height of the Washington Monument is measured to be 170 m on a day when the temperature is 35.0 °C. What will its height be on a day when the temperature falls to -10.0 ° C? Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's. 2.How much taller does the Eiffel Tower become at the end of a day when the temperature has increased by 15 ° C? Its original height is 321 m and you can assume it is made of steel. 3.What is the change in length of a 3.00-cm-long column of mercury if its temperature changes from 37.0 ° C to 40.0 ° C, assuming the mercury is unconstrained? 4.How large an expansion gap should be left between steel railroad rails if they may reach a maximum temperature 35.0 ° C greater than when they were laid? Their original length is 10.0 mQ3/ A patient who suffers from a problem in the knee joint and needs a joint replacement. As a Biomaterials engineer, you have three metal materials, any of these materials in the table 1. you prefer for the replacement process with mentioning the reason. If you know that the joint is exposed to compression resistance resulting from the weight of the person, and the load applied on the joint is 80 kg, with a cross-sectional area of 40 mm Table 1. The materials properties Materials Compressive strength (Mpa) Туре I 17.6 Туре II 30.2 Туре I 6.5
- Aluminum To illustrate the effect of ice on the aluminum cooling plate, consider the drawing shown here and the data that it contains. Ignore any limitations due to significant figures. Review lecture example for assistance (Cutnell 377) Ice -10.0 °C -25.0 °C (a) Calculate the heat per second per square meter that is conducted through the ice-aluminum combination. F.0050 m-- (b) Calculate the heat per second per square meter that would be conducted through the aluminum if the ice were not present. Notice how much larger the answer is in (b) as compared to (a). 0.0015 mTo 8. 22 1 2 T₁ 3 1. 2. 3. 4" Common Brick 1/2" OSB Sheathing 3-1/2" x 1-1/2" (2x4) Yellow Pine Studding placed on 16" center 4. 5. 3-1/2" Figerglass Insulation 1/2" Drywall A wall of a house as shown in the accompanying sketch is 10 ft. high and 30 ft. long and has no windows. The outside heat transfer coefficient, h., is 6.0 Btu/hr ft2°F and the inside convective heat transfer coefficient hi is 1.45 Btu/hr ft²°F. 6. Calculate the heat loss through the wall if the house is heated such that the room air temperature, Ti, is 70°F on a day when the outside air temperature, T., is 0°F. State all assumptions and list the thermal resistances and thermal conductivities for each selection of the wall. For this problem, what would be the 7. value of the overall heat transfer coefficient, U? Ans: U = 0.056 Btu/hr ft2°F You are asked to design a metal hot dog holder for roasting hot dogs over an open campfire. The holder is to be designed such that while the end holding the hot dog becomes cherry…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…
- 7. In a Lancashire steam boiler, there is a ------- at the end of the fire grate which is utilized in deflecting the flue gases upwards. 8. There are geothermal resources named ----- contain hot liquid water at temperatures up to 450 K and pressures up to 60 MPa. 9. There are fine flat plates in the combustion chamber of a single-ended scotch marine boiler. These plates require ----------. 10. The main objective of the ---------- is to protect the turbines against the water hammer effect at the time of starting or shutting off the hydroelectric power plant. 11. Based on the furnace position, Cornish boiler is classified as ‒‒‒‒‒‒‒‒‒‒‒1- Design and sketch the form for 7.5 ft high and 1 ft thick wall using 5/8" B-B plyform Class I (4 ft x 8 ft sheets) and 2 x 4 S4S Douglas Fir Larch No. 2 for studs and wales. Form will be used only once. The plan is to complete the placement in 45 minutes and the concrete weighs 150 pcf. Temperature at placement will not be lower than 65°The thermal resistance for convection at the outer surface of the hollow cylinder is a. None of the options b. Re 1/hrL c. Rc 1/2nhrL %3D d. R= 2 nhrL %3D
- 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 falseShape factor S=M/N, N isShape factor S=M/N, N is Number of isothermal boundaries Number squares in a row between isothermal boundaries Number squares in a column between isothermal boundaries Area of one of the squares wherein q' is being transferredb) A steel pipe of 100mm bore and 7mm thickness transports steam at 260 °C. The pipe is insulated with 40mm of a molded high temperature diatomaceous earth covering. This covering is in turn insulated with 60mm of asbestos. If the atmospheric temperature is 25 °C, calculate the rate at which heat is lost by the steam per meter length of the pipe.