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?

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?

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter8: Direct Use Of Solar Energy

Section: Chapter Questions

Problem 6P

See similar textbooks

Similar questions

Q2): 1200 BPD of 32 ° API crude oil is fed to an atmospheric distillation unit, the following products were obtained in the presence of 567 lb/hr steam. Assume vaporization temperature = 576 °F Volume, °API Mw T Latent heat CP, CPL Percent (Btu/Lb) (Btu/Lb °F) (Btu/Lb °F) (°F) Gasoline 26.8 62.8 286 110 0.615 120 0.59 Naphtha 5.63 52.8 113 155 335 0.604 0.58 420 Kerosene 19.8 45.6 185 100 0.60 0.604 Gas oil 510 10.6 39.4 240 0.615 90 0.63 510 Reduced 36.97 0.74 31.2 crude 576 Crude 100.00 0.5 535 Steam Check the gas oil plate temperature if the dew point and bubble point of gas oil are 600 ° F and 580 ° F respectively and the pressure at the withdrawn plate is 990 mm Hg. Given: 1 BPD = 42gal, pwater 8.324 lb/gal
As a plant maintenance engineer, you are required to purchase a 3,000 L tank of liquid butane to heat a maintenance building during the winter. You are concerned about the tank rupture and the possibility of a vapour cloud explosion of all the butane. How far (in metres) must the tank be from the maintenance building to ensure that it will receive only partial demolition in the event of an explosion? The specific gravity of liquid butane is 0.6, and the energy of explosion for butane is 510 kcal/gm-mol. Assume the explosion efficiency is 10 % in this case.
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/kg
Chloroform, CHCl3 a volatile liquid, was once used as an anesthetic but has been replaced by safer compounds. Chloroform boils at 61.7°C and has a heat of vaporization of 31.4 kJ/mol. What is its vapor pressure at 37.2°C?
Question 2 Lauren has worker bullding her house on a hot summer day. She prepares a drink for them by adding a certain amount of ice at 0.0 °C to 1.8 kg of tea, initially at 80°C. How much ice in kilograms does she need to get the iced tea to be at final temperature of 10C? The heat of fusion of ice is 333 kJ/kg, specific heat of ice is 2100 J/kg. "Cand that of tea is 4186 Jkg. C 1.0 kg 15 kg O 12 kg
If the CO2 concentration doubled from 400 ppm to 800 ppm, how would the density of dry air change? Actually calculate the density in both cases and the difference.
An incinerator burns 180 lb/hr chlorobenzene and has a stack gas containing 7% oxygen by volume on a dry basis. Determine the percent excess air .
By how much could the flow rate of fuel gas of Example 11.2 be reduced if a recuperator were used to preheat the waste gas by recovering the enthalpy released when reducing the exhaust gas temperature from 1350 oF to 650 oF? Determine the preheated waste gas temperature as it enters the afterburner.
Q4- Determine the following properties for the gas given below at 5420 psig and 257°F. - value of z-factor - gas specific gravity - gas density - specific volume - isothermal gas compressibility - gas formation volume factor - gas viscosity - gas expansion - * -gross heating value Composition, mole percent Component Hydrogen sulfide Carbon dioxide Nitrogen Methane Ethane 20.90 44.69 1.22 21.80 3.68 2.05 0.58 1.09 Propane - i- Butane n-Butane i- Pentane n-Pentane Hexanes Heptanes plus 0.46 0.56 0.72 2.25 100.00 Properties of heptanes plus Specific gravity Molecular weight 0.844 115 Ib/lb mole
The air inside a hot-air balloon is heated to 72.00 °C (Tinitial) and then cools to 52.00 °C (Tfinal). By what percentage does the volume of the balloon change?
A waste is being discharged into a river that has a temperature of 8°C. What fraction of the maximum oxygen consumption would be expected in four days if the 20°C BOD rate constant is 0.115 d''? How would the result be different if the river temperature was 22°C? You may assume that 0 is 1.047.
Question 2. A coal fired power station requires an ESP for dust removal from the flue gas. The influent flu gas has a concentration of 5200 mg/m3 of dust particles and a flow rate of 150 m3/s. The smallest particles in the gas stream are 1.5 um in diameter, and all particles have a dielectric constant of 5.5. The emission standard is 50 mg/m3. Assume a plate-to-plate spacing of 30 cm and an applied voltage of 15,000 volts. Each plate is 20 m long and 15 m high. Estimate –a) The particle drift velocityb) The required collection-plate area and number of plates required.Assume – Standard temperature and pressure.