How much natural gas do you need to burn to heat fifty-seven gallons of water? (Assume a heating value of 1,000 Btu/ft³ for natural gas and 100% efficiency. Note that 1 gallon of water has a mass of 8.34 lbm. Enter the volume in ft³ needed to increase the temperature of the water by 1°F.)
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- 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 aboveCalculate 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.6.0 g of cream at 13.2 °C are added to an insulated cup containing 150.0 g of coffee at 92.9 °C. Calculate the equilibrium temperature of the coffee. You may assume no heat is lost to the cup or surroundings, and that any physical properties of cream and coffee you need are the same as those of water. Be sure your answer has 3 significant digits.
- 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?Determine the energy consumption (BTU/min), If two 50-kg LPG tanks are needed per 24-hour operation, heating value for the LPG of 11,000 kcal/kg. Subject: Civil Engineering: ThermodynamicsA 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.
- 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/kgFor 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.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?
- 2.5 liters of water at initial temperature of 16?C absorbed 800 calories of heat. Calculate the final temperature.Current Attempt in Progress A small electric immersion heater is used to heat 71 g of water for a cup of instant coffee. The heater is labeled “63 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) 17h pros Number i UnitsA spring-loaded piston-cylinder device contains 1.5 kg of carbon dioxide. This system is heated from 200 kPa and 25 °C to 1200 kPa and 300°C. Determine the total heat transfer to and work produced by this system.