A home owner has a leaky bathroom faucet. If her faucet leaks 0.5 L/min and her water is heated to 45C with inlet water from a well supply at 15C then how much does the leak cost her per year? Assume her water is heated by propane at a cost of $0.65/L including tax using a boiler that is 85% efficient. Hint: 1L of propane is equivalent to 23700 BTU. O a. 1121.84 O b. 776.58 O. 1553.16 O d. 2329.75 O e. 984.20 Of. 1683.24

A home owner has a leaky bathroom faucet. If her faucet leaks 0.5 L/min and her water is heated to 45C with inlet water from a well supply at 15C then how much does the leak cost her per year? Assume her water is heated by propane at a cost of $0.65/L including tax using a boiler that is 85% efficient. Hint: 1L of propane is equivalent to 23700 BTU. O a. 1121.84 O b. 776.58 O. 1553.16 O d. 2329.75 O e. 984.20 Of. 1683.24

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter20: Hydrogen

Section: Chapter Questions

Problem 4P

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A home owner has a leaky bathroom faucet. If her faucet leaks 0.5 L/min and her water is heated to 45C with inlet water from a well supply at 15C then how much does the leak cost her per year? Assume her water is heated by propane at a cost of $0.65/L including tax using a boiler that is 85% efficient. Hint: 1 L of propane is equivalent to 23700 BTU. а. 776.58 ОБ. 984.20 O C. 1553.16 O d. 2329.75 е. 1121.84 O f. 1683.24
The storage tank of your plant has a 1.20 million gallon capacity and the demand is 0.40 million gallons per day (MGD). If the pump was broken, how many more days could your plant supply the water?
PLEASE ANSWER QUESTION D You have been contracted to determine the characteristics of raw water at 20°C. You complete a chlorine dosing experiment to aid in designing your chlorination process (Figure Below).a. What is the breakpoint chlorine dosage?b. What is the chlorine demand at a chlorine dosage of 1.2 mg/L?c. For a plant that processes 10 m3/hr, how much chlorine should I add per day to reach a constant residual chlorine concentration of 0.7 mg/ld. Design a chlorine contact tank that would achieve the required Ct value for a 3 log deactivation of Girardia (Ct = 54 mg/l min).
Before being put in service, a new distribution reservoir has to be disinfected. The reservoir is 10m in diameter, and 6 m high. Determine the volume, in L, of five percent sodium hypochlorite solution required to make the 50 mg/L chlorine solution for disinfection. Round your answer to the nearest whole number. 471
You have been contracted to determine the characteristics of raw water at 20°C. You complete a chlorine dosing experiment to aid in designing your chlorination process (Figure Below).a. What is the breakpoint chlorine dosage?b. What is the chlorine demand at a chlorine dosage of 1.2 mg/L?c. For a plant that processes 10 m3/hr, how much chlorine should I add per day to reach a constant residual chlorine concentration of 0.7 mg/ld. Design a chlorine contact tank that would achieve the required Ct value for a 3 log deactivation of Girardia (Ct = 54 mg/l min).
You are the Water Sanitation Engineer for Waterbury. Levels of bacterial cells in the water supply must be undetectable, which, in terms of the equation, is <1 per mL of drinking water. A single addition of chlorine yields a log kill every 5 minutes. During a storm, levels in the incoming water reach 10,000/mL. You hold the incoming water in a treatment tank and give it a single hit with chlorine. If you add the chemical at 10 a.m., when will it be safe to open the valve and release that water for drinking? (Recall that 10 raised to the 0 power is 1.)
Each hour an oil burner runs, the nozzle sprays 3⁄4 gallon of fuel. If the burnerruns for 21⁄2 hours, how much fuel is sprayed into the burner?
Coming home after the end of the winter semester, you find that your family’s swimming pool has not be maintained well. In particular, it has no chlorine residual at all, and it is full of tree leaves. You buy a concentrated chlorine solution (1% as Cl2) and begin to meter it into the pool at a rate of 100 mL/hour. The pool has a volume of 200 m3. You also add new water, and remove in-pool water, at a rate of 3.785 L/minute. The chlorine reacts with the organic matter in the with a rate of 0.5/hour. How long will it take to get the Cl2 residual up to 1 mg/L if you add Cl2 continously.
If a water treatment plant uses 124 chlorine cylinders (cy) during a 30-day period, the average supply from each cylinder is 135 lb. What is the total weight (in lb) of chlorine used in 30 days?
Choose the correct answer 200 g CO2 approximately takes up ____ L volume in air at 1 atm and 0oC? 4480; 100; C. 200; D. Undetermined Which of the following gases has the greatest contribution to the greenhouse effect on the Earth? A. Water vapor; B. CO2; C. CH4; D. O3 Based on what you have learned, which of the following can contribute(s) greenhouse gases? A. landfills; B. a deep lake with organic rich sediments; C. septic tanks; D. all of the above Which of the following gases is NOT a greenhouse gas? A. methane; B. carbon monoxide; C. hydrofluorocarbons; D. water vapor
You are considering purchasing a compact washing machine, and you have the following information: • The Energy Guide claims an estimated yearly electricity use of 350 kW-hrs, based on 8 loads of laundry being washed per week. • The Energy Guide claims an estimated yearly operating cost of $38. This estimate is based on $0.1065 per kW-hr, and eight loads of laundry being washed per week. • Local electricity costs $0.086 per kW-hr. • You wash four loads of laundry per week. Based on this information, first calculate the energy that would be used by this compact washing machine in a year. Then calculate the yearly energy cost. $3.27 $15.34 $19.00 $178.40
You are treating 10 million gallons per day (MGD) of water with alum at a dosage of 50.0 mg/L. Alum is available as a hydrated salt Al2(SO4)3.16H2O. Determine:(a) The monthly alum dosage required in metric tons/month (1 metric ton = 1000 kg)(b) If you assume that each equivalent of alum added to the water consumes 1 equivalent of alkalinity, determine the alkalinity consumed by alum addition in milliequivalents/L (meq/L)(c) Given that the raw water contained 30 mg/L as CaCO3 of alkalinity, is the alkalinity sufficient? What would happen if the alkalinity is inadequate?