____ refers to the pleasurable response you get to an object or experience.
A. Ergonomics
B. Aesthetics
C. Impact
D. Yield
Answer: B
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In addition to heat and work flows, energy can be transferred as light, as in a photovoltaic device (solar cell). The energy content of light depends on both its wavelength (color) and its intensity. When sunlight impinges on a solar cell, some is reflected, some is absorbed and converted to electrical work, and some is absorbed and converted to heat. Consider an array of solar cells with an area of 3 m2. The power of sunlight impinging upon it is 1 kW? m?2. The array converts 17% of the incident power to electrical work, and it reflects 20% of the incident light. At steady state, what is the rate of heat removal from the solar cell array?
What will be an ideal response?
You need to find the vapor pressure of ethyl benzene at a temperature 20 degrees Celsius above its normal boiling point (the normal boiling point is 136 C). You will do this two ways:
a) Use the physical property data available in the Appendix C to help provide this estimate. (b) Use the Antoine equation constants available in Appendix E to provide this estimate.
Why should a ground fault interrupter be used with portable electric tools?
What will be an ideal response?
Liquid ethanol is a flammable fluid and can release vapors that form explosive mixtures at temperatures above its flash point at 16.6°C. In a chemical plant, liquid ethanol (cp = 2.44 kJ/kg•K,?? = 789 kg/ m3) is being transported in a pipe with an inside diameter of 5 cm. The pipe is located in a hot area with the presence of an ignition source, where an estimated 20 kW of heat is added to the ethanol. Your task as an engineer is to design a pumping system to transport the ethanol safely and to prevent fire hazard. If the inlet temperature of the ethanol is 10°C, determine the volume flow rate that is necessary to keep the temperature of the ethanol in the pipe below its flash point.
