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a. A process heater uses Dowtherm A heat transfer fluid to provide 850 kW of heat. Estimate the annual operating cost of the heater if the Dowtherm evaporator is 80% efficient and the price of natural gas is $4.60/MMBtu. Assume 8000 operating hours per year.
b. A site steam system consists of HP steam at 40 bar, MP steam at 18 bar, and LP steam at 3 bar. If natural gas costs $3.50/MMBtu and electricity is worth $0.07/kWh, estimate the cost of steam at each level in $/metric ton.
Suppose the various color frequency and intensity values that comprise a color analysis are combined into a single numerical value, C, for a particular yellow dye. During a test period in which the reactor conditions are carefully controlled and t..
you are an ehamps professional returning home from your plant on a summer friday afternoon at about 4 p.m. you have
You decide to take 2.00 mL of the solution and add an excess of a concentrated sodium chloride solution. You obtain a solid with a mass of 3.407 g. What was the concentration of the original lead(II) nitrate solution?
Calculate the theoretical stages needed to separate a 10 mole% ethanol liquid saturated feed into a 80 mole% distillate and a 0.1 mole% bottoms at 1 atmosphere pressure.
Is our "technological distraction" contributing to the fact that other more pressing interests like the cure for cancer have not been achieved?
When algae growing in water containing only 16O were furnished carbon dioxide containing 18O, no 18O was found to be evolved from the oxygen gas produced. What conclusions about photosynthesis can be drawn from these experiments?
Determine the longest wavelength (in cm) of X-rays that is still capable of producing diffraction in copper, Cu.
Design a reactor system to produce 40 metric tons per year of riboflavin using the strain given in the patent.
What is the name for the alkaline hydrolysis of an ester? Discuss the solubility of covalent compounds vs ionic compounds in polar and non polar media respectively.
The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of..
a. How many design variables must be specified in order to calculate the output stream compositions and flow rates? b. How would you optimize these variables if the objective of the separator was to maximize recovery of condensable components into ..
questiona personal protective equipment are only used when it has proven impractical to control occupational hazards by
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