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- Many 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 .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?At a certain location, the solar power per unit area reaching Earth's surface is 200 W/ m^2, averaged over a 24-hour day. If the average power requirement in your home is 3 kW and you can convert solar power to electric power with 10 % efficiency, how large a collector area will you need to meet all your household energy requirements from solar energy? (Will a collector fit in your yard or on your roof? ).
- sometimes the hot water produced by a solar water heater is not warm enough to mee the needs of the occupants of a building. A traditional water heater inside the building supplies additional thermal energy to the solar warmed water. How can this method still reduce the overalll amount of natural gas or electrical energy a building uses?Suppose a utility generates electricity with a 32% efficient coal-fired power plant that emits SO₂ at the legal limit of 0.6 lb per million Btu of heat into the plant. If the utility customers replace their 75W incandescent light bulbs with 18W compact fluorescent lights (CFL), then: a) Over the 10,000hr lifetime of each CFL, how many kW.hr of electricity is saved? Answer: 570 kW.hr b) How much SO₂ is not emitted due to this change? Note: the conversion factor from kW to Btu/hr is 3,412 kW/Btu.hr Answer: 3.65 lb c) How much would the utility save per CFL if it can sell its right to emit SO₂ at the price of $800 per ton, given that there are 2,000lb in a ton? Answer: $1.44The average electricity consumption of a house in Gainesville is known to be 1,036 kWh in a month (One month = 30 days). They would like to install solar panels of 30 % efficiency to generate this electricity. Given that the average solar power density in Gainesville is 5.47 kWh/m2/day, how much surface area must the panels occupy? Calculate the result in m² but do not write the unit. Round off you E swer to a whole number (zero decimal place.)
- At a certain location, the solar power per unit area reaching Earth’s surface is 200 W/m2, averaged over a 24-hour day. If the average power requirement in your home is 3 kW and you can convert solar power to electric power with 10% efficiency, how large a collector area will you need to meet all your household energy requirements from solar energy? (Will a collector fit in your yard or on your roof?)A power plant burns coal to produce pressurized steam at 554 K. The steam then condenses back into water at a temperature of 334 K If the plant operates at 50.0% of its maximum efficiency and its power output is 1.23 * 10 ^ 8 * v means of a cooling tower ? at what rate must heat be removed by means of cooling tower?Example: of the table. Initial energy Ep Final energy Ek But conservation of energy tells us Ep Ek. So mgh mv 2gh v so v25 h- 29 20 so h 1.25m F-014 4 mudo es poun
- Three 105.0-g ice cubes initially at 0oC are added to 0.900kg of watter initially at 21.5oC in an insulated container. What is the mass of unmelted ice, if any, when the system is at equilibrium?Determine the energy stored (in units of mJ) by C4 when C1 = 20 µF, C2 10 uF, C3 = 14 pF, C4 = 30 pF, and Vo = 61 V. Select one: OA. 0.93 O B. 3.97 OC. 5.95 OD. 0.65 OE. 58.05One energy concept is cogeneration system of photovoltaic solar cells combined with a thermal capture of the waste heat absorbed for hot water in homes. Do a first law analysis of a 2 kWe system where the solar photovoltaics are collecting 50% of the incoming solar irradiance, and are 10% efficient in converting sunlight directly to electrical power. What is the thermal energy available? How much water can you heat?If you do not heat water, what happens to that thermal energy?
