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- Note: please use the given formula of radiation heat transfer, and use appropriate symbols and units. Formula: Qrad = eσA(T1⁴-T2⁴)Discuss why a 1-ft2 hole in a ceiling that admits sunlight when the Sun is overhead is like having a 100-W bulb in the room. Assume the atmosphere reduces solar energy at Earth’s surface as 1.0 kW/m2.What is the average energy contained in a 1.00 m3volume near the Earth’s surface due to radiant energyfrom the Sun?
- A water heater is operated by solar power. If solar collector has an area of 6.00m2 , and the Intensity delivered by sunlight is 550W/m2 , how long does it take to increase the temperature of 1m3 of water from 20°Cto 60°C?Suppose you have a car with a 100-hp engine. How largea solar panel would you need to replace the engine withsolar power? Assume that the solar panels can utilize 20% ofthe maximum solar energy that reaches the Earth’s surface(1000 W m2).Calculate the rate at which radiant energy is flowing in Watts (W) from the radiator's 1.5 m? surface if the surface is polished iron at 65\deg C.
- •A steel tape measure is calibrated at 70 o F. A reading of 120 ft is obtained when it isused to determine the width of building at 0 o F. What is the true width of the buildingat 0 o F?' •A 300 g aluminum pot containing 0.50 L of water is placed on the 1 kg iron hot plateon an electric stove. The heating element of the hot plate is rated at 1.5 kW. If the hotplate, the pot, and the water are all at 20 o C when the heating element is switched on,how long will it take until the water begins to boil? Neglect heat losses to thesurroundings.you are standing 2.5 m from a 150-W lightbulb. If the pupil of your eye is a circle 5.0 mm diameter, how much energy enters your eye per second? (assume 5.0% of the lightbulb's power is converted to light)A cup of water (400 grams at 20 degrees Celsius) is placed into a microwave and radiated for 1 minute. It reaches a temperature of 72 degrees. What is the rate of power delivered to the water?
- At a certain location , the solar power per unit area reaching Earth’s surface is 200 W/m square , average over a 24 hours day. If the average power requirement in your home 4.0 KW you can covert solar power to electric power with 13% efficiency. How large a collector area will you need to meet all your household energy requirements from solar energy?Calculate the rate at which the human body radiating energy when it is at 36.5 °C. Take the body surface area to be 1.37 square meters, and it approximates to a blackbody. kWMany decisions are made on the basis of the payback period: the time it will take through savings to equal the capital cost of an investment. Acceptable payback times depend upon the business or philosophy one has. For some industries, a payback period is as small as 2 yeas) Suppose you wish to install the extra insulation in the preceding problem. If energy cost $1.00 per million joules and the insulation was $4.00 per square meter, then calculate the simple payback time. Take the average T for the 120-day heating season to be 15.0 .