List at least three variables (structures) that affect the loss of heating and cooling in the building (house).
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List at least three variables (structures) that affect the loss of heating and cooling in the building (house).
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- Which of the following does not affect the demand for cooling in a given space? Select one: a. Number of occupants in the given space b. Positioning of the room in the house c. Direction where the building is facing d. Cooling capacity of the cooling systemA house is being built. The contractor states that the cost to install electricbaseboard heat will be $2,480. The contractor also states that a forced air,heat pump system will be 21⁄4 times as much. How much will the heat pumpsystem cost?What is passive cooling of buildings? explain various passive cooling technologies with the help diagrams. Which technologies are suitable for UAE climate? Hint: UAE climate is very hot sometimes 45 degrees and 30% humidity.
- A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 lightbulbs in the room, each1 with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/h. If the room air is to be maintained at a constant temperature of 21°C, determine the number of window air-conditioning units required.Discuss the systems and equipment available for cooling systems in large buildings.P-Green Building features high-efficiency systems the following except: a. Heating b. Lighting c. Cooling d. Electricity e. None of the above
- Assume an inside room temperature of 70°F and an attic air temperature of 15°F, with an exposed area of 885 ft2. Calculate the heat loss (in Btu/h) through the ceiling if the R-19 insulation batt is replaced by R-35 fiberglass insulation.The filter for a room air-conditioning unit has an area of 1,600 sq cm. Howmany square inches are there in the filter?A department store plans to construct a one-story building with a rectangular planform. The building is required to have a floor area of 10,000 f2 and a height of 15 ft. It is proposed to use brick walls on three sides and a glass wall on the fourth side. Use the Lagrange multipliers to find the dimensions of the building to minimize the heat loss, assuming that the relative heat losses per unit surface area for the roof, brick wall, glass wall, and floor are in the proportion 3:2:7:1
- Compare the masses and volumes of water, concrete, sand, and wood needed to store 106 Btu of heat if the operating temperatures are Tc = 85F and Th = 180F. In each case, calculate the edge length of a square storage unit with a height of 8 ft.Complete the following sentences (showing your calculation): The R- value for a 50 mm wood fiber insulation board (k= 0.044 W/m.K)= ……….................................................................................................... The U- value for a 120 mm clay roofing tile (k= 0.75 W/m.K)= .................. The light solar gain ratio for a window with the following characteristics (U= 1.11 W/m2.K, SHGC = 86%, VT= 90%)…………………………………………………………. In a room (8*6*3.5) if the total heat losses is 1000 Watt and the percentage of ceiling losses from total was 20% , if we treat just the ceiling such that we reduce her losses by the half what will be the new total losses for the room …………………………………………………….........................................................…..Calculate the amount of radiation emitted for a unit surface (1 m2) for the following situations: (a) a hot pavement in Arizona at 50 °C (122 °F) and 0.8, (b) a hood of a car at 40 °C (104 °F) and 0.9, and (c) a sunbather at 38 °C (100 °F) and 0.9. Express your answers in both SI and U.S. Customary units.
