When 1 cu ft of natural gas is burned, 1,050 Btu of heat are produced. In oneday, a building uses 761,250 Btu of heat. How many cubic feet of gas areburned?
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When 1 cu ft of natural gas is burned, 1,050 Btu of heat are produced. In one
day, a building uses 761,250 Btu of heat. How many cubic feet of gas are
burned?
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- When a refrigerant vaporizes, it takes heat from its surroundings. The latentheat of vaporization is the amount of heat needed for the refrigerant tovaporize. When 38.5 pounds of R-124 vaporize at 5°F, the latent heat ofvaporization is 2,721.95 Btu. What is the latent heat of vaporization for 1 poundof R-124 at 5°F?For a building located in Madrid, Spain with annual heating degree-days (dd) of 4654, a heating load (heat loss) of 30,000 kj/h, and a design temperature difference of 30° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 92%, how muchgas is burned to keep the home at 20° C? State your assumptions.A 1000 MW coal fired power plant (30% efficiency). The coal is 75% carbon and has a heat content of 10, 000 BTU/lb. What is the carbon emission (ton carbon per year)?A 1000 MW natural gas plant (45% efficiency). The gas is CH4 with a heat content 800 BTU/mol. What is the carbon emission (ton carbon per year)?Calculate carbon emission reduction if the above natural gas plant is used to replace the coal fired plant.(Here ton is metric ton, 1 ton=2,200 lb)
- Consider a 400-MW, 32 percent efficient coal-fired power plant that uses cooling water withdrawn from a nearby river (with an upstream flow of 10-m3/s and temperature 20 °C) to take care of waste heat. The heat content of the coal is 8,000 Btu/lb, the carbon content is 60% by mass, and the sulfur content is 2% by mass. How much electricity (in kWh/yr) would the plant produce each year? How many pounds per hour of coal would need to be burned at the plant? Estimate the annual carbon emissions from the plant (in metric tons C/year). If the cooling water is only allowed to rise in temperature by 10 °C, what flow rate (in m3/s) from the stream would be required? What would be the river temperature if all the waste heat was transferred to the river water assuming no heat losses during transfer? Estimate the hourly SO2 emissions (in kg/h) from the plant assuming that all the sulfur is oxidized to SO2 during combustion.Water falls from a height of 500 m and the mass of water is 50 kg. What is approximately the rise in temperature of water at the bottom if the whole energy is used to heat the water? Specific heat of water is 4.18 kJ/kg-deg C. O 5000 deg C O 1173 deg C O 500 deg C O 0.23 deg C O none of the aboveA 600 MW coal-fired power plant has an overall thermal efficiency of 38%. It is burning coal that has a heating value of 12,000 Btu/lb, an ash content of 5%, a sulfur content of 3,0%, and a CO2 emission factor of 220 IWmillion Bin. Calculate the heat emitted to the environment (Btu/sec), the coal feed rate (tons/day), the degree (%) of sulfur dioxide control needed to meet an emission standard of 0,15 lh SO2/inillion Bin of heat input, and the CO2 emission rate (metric tons/day).
- The Energy Efficiency Rating (EER) of an air-conditioning unit is defined asthe ratio of the heat removed in Btu/hr divided by the energy used in watts. Awindow air conditioner is rated at 5,170 Btu. It uses 470 watts of power. Whatis this unit’s EER?A home is heated with propane with a 100,000 BTU furnace size and 95% efficiency. The monthly heating degree days is 5000. Using the energy estimation discussed in this chapter, estimate the monthly and annual gas consumption to heat the building if the home is to be kept 68°F.Calculate the amount of energy required in BTU to heat the air in a 10°F house 30 by 50 by 40 ft and increase the temperature by 70F at constant pressure.
- 2 m^3/min of a light oil are to be heated from 20C to 100C (with zero vaporization) in an exchanger using 250 kPa steam of 90% quality. The heat losses to the surrounding air have been estimated to be 5% of the heat transferred from the condensing steam to the oil. If the steam condensate leaves at its saturation point, what mass of steam per hour will be used in the exchanger? For light oil, Specific gravity= 0.88Specific heat= 2.00 kJ/kg-KFor steam at 250 kPa,Saturated liquid: hf= 535.49 kJ/kg vf= 0.001067 m^3/kgSaturated vapor: hg= 2716.8 kJ/kg vg= 0.7188 m^3/kgHello, I need some help with this question 1 gallon of oil = 4.1 therm and 1 therm costs $1.40 You realized you had 3,600,000 BTU heat loss over a winter month. (1 therm = 100,000 BTU) How much money has been wasted in heat loss?For a building located in London, England with annual heating degree-days (dd) of 5634, a heating load (heat loss) of 42,000 kj/h, and a design temperature difference of 35° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 98%, how much gas is burned to keep the home at 20° C? State yourassumptions.
