Calculate Temperature gradient through the following wall section with description of components and thermal resistances when...
QUESTION 2 Calculate heat loss through square foot of construction assembly consisting of 4 in brick veneer, vapor barrier, ½ in plywood, insulation with 2x4 @16” stud spacing (R- value of 10) and ½” drywall DB difference in temperature of 20°F. Round off R of wall to whole number.
1. A ¾ inch (nominal), Schedule 40, mild steel pipe carries 40 psia steam through a room having an air temperature of 80°F. The pipe is covered with a 0.125 ft thick layer of fiberglass insulation having a thermal conductivity of 0.037 Btu/(h ft ‘F). The hi value on the steam side of the pipe is 1000 Btu/h ft2 °F. The ho value on the outside of the insulation is 2.0 Btu/(h ft2 ’F). For the mild steel, k=26Btu/(ft H...
(10 point) 60. A typical exterior masonry wall of a house, shown in the accompanying figure, consists of the items in the accompanying table. Assume an inside room temperature of 68F and an outside air temperature of 10F, with an exposed area of 150 ft2. Calculate the heat loss through the wall. Items Resistance 1. Outside film resistance (winter. 15 mph wind) 2. Face brick (4 in. 3. Cement mortar (1/2 in.) 4. Cinder block (8 in) 5. Air space...
2.) A plane wall is made of brick with a thermal conductivity of 1.5 W/(m-K). The wall is 20 cm thick and has a surface area of 10 m2. One side of the wall is exposed to outside air blowing against the wall resulting in a heat transfer coefficient of 20 W/(m2-K). The other side is exposed to an air-conditioned room with a convective heat transfer coefficient of 5 W/(m2-K). a. What are the thermal resistances corresponding to conduction through...
1) A frame wall of the bedroom of a house has the following specifications: – Wall: 12 ft. by 8 ft., wood siding, wood sheathing, 2 in. of insulation with R-7 value, and inside finish – Window: 3 ft. by 4 ft. 6 in., single glass, aluminum frame The room temperature is 68º F and the outdoor temperature is 2º F. What is the heat transfer through the total assembly (wall and window combined)? 2) Consider a 1 ft ×...
Figure 1 A typical section of a building wall is shown in the following figure. This section extends in depth and repeated in vertical direction. The wall support members (grey parts) are made of steel with thermal conductivity of k.-50W/mK and dimensions ofLs-50mm by t23. The remainder of the inner wall space is filled with insulation. The inner wall is made of gypsum board with thermal conductivity of k-0.5W/ mK and thickness of tı2-10mm The inner wall is made of...
summatize the following info and break them into differeng key points. write them in yojr own words apartus 6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...