Why did LEDs replace miniature incandescent (metal filament) light bulbs?
What will be an ideal response?
LEDs soon replaced miniature incandescent (metal filament) light bulbs and lamps in many applications because LEDs were more durable, consumed less power, and lasted longer.
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Why were split systems developed?
A) Splitting the refrigerant flow between two systems reduces line size. B) Splitting the controls into two panels provides redundancy. C) It is not always practical to have all the components of a large air-cooled system located in a single box. D) Splitting the airflow between two pieces allows for more airflow.
The purpose of ROPS is to keep the operator of the equipment in question from being crushed should the equipment roll over.
The wet coil static pressure drop is:
A) Higher than the dry coil static pressure drop. B) Can only be determined when the coil is submerged in water. C) About the same as the dry coil static pressure drop. D) Lower than the dry coil static pressure drop.
The vapor pressure of benzene at T=25 °C is 0.125 bar. The Appendix of your book contains enough additional data on benzene to estimate other vapor pressures by the Antoine, shortcut, or Clausius-Clapeyron approaches.
The molar volume of liquid benzene at room temperature and pressure (T=25 °C, P=1 bar) is V = 88.9 cm3/mol. Liquid benzene also has a coefficient of thermal expansion of ? =1.237 x 10-3 K-1and isothermal compressibility of ? = 8.9 x 10-5bar-1 A) Give your best estimate of the vapor pressure of benzene at T=50 °C, and explain why you chose the method that you chose. B) Give your best estimate of the vapor pressure of benzene at T=100 °C, and explain why you chose the method that you chose. C) Give your best estimate of the fugacity of liquid benzene at T=25 °C and P=20 bar, and state any assumptions that you make. D) (10 points) Benzene expands as it’s heated. Estimate the molar volume of liquid benzene at a temperature of 50 °C and a pressure of P=1 bar.