Search & Filtering
In order to reduce cooling electricity consumption in an industrial plant, it is proposed to install an absorption refrigeration system running on solar energy. The absorption system costs $300,000 and the operating and maintenance expenses are $8000 per year. It is estimated that this absorption system will save $27,500 per year from the electricity they save. The lifetime of the system is expected to be 20 years with an average annual inflation-adjusted interest rate of 4 percent. The system will have no salvage value after 20 years of its lifetime. Would you support this project from an economic point of view? How would you evaluate this project if the inflation-adjusted interest rate is 2 percent?
Springbok (South Africa) City or Windhoek (Namibia) are considered for the installation of a solar power plant utilizing parabolic trough collectors. The total area of the collectors is 6000 m2 and the average efficiency of the plant is estimated to be 15 percent. Using the average daily solar radiation values on a horizontal surface available online, determine the amount of electricity that can be produced in each city.
Compare the amount of solar energy input to a horizontal surface for winter and summer months in Cairo (Egypt) and Upington (South Africa). Determine the ratio of solar energy input in summer to that in winter for each city.
A harmonic oscillator has a mass of 0•20kg,an unknown spring constant, if the period is T=20. Find k
Analyze the following Java Program and complete the missing codes:
public class Tut1_17032021_Qb {
public static void main(String[] args){
String name;
String AssessedValueString;
String outputStr;
name = JOptionPane.showInputDialog("Enter Property Name and press ok!");
AssessedValueString = JOptionPane.showInputDialog("Enter Assessed value and press
ok!");
AssessedValue = Double.parseDouble(AssessedValueString);
TaxableAmount = AssessedValue*TaxablePercentage;
PropertyTax = (TaxableAmount/100)*TaxRate;
outputStr = "Property Name: " + name + "\n" + "Assessed Value: R " + AssessedValue + "\n"
+
"Taxable Amount: R " + TaxableAmount + " \n" + "Tax Rate for each R100.00:
" + TaxRate + "
\n" + "Property Tax : R " + PropertyTax;
JOptionPane.showMessageDialog(null, outputStr, "Mafikeng Local Municipality",
JOptionPane.INFORMATION_MESSAGE);
how many moles of sodium sulfate will be produced from 25.5 g
of sodium hydroxide?
Matt is watching a jet take off when he hears the engine roar with an intensity of 100 W/m^2. At what minimum distance should Matt be, in order for him to not hear the jet?
Balance a reaction between sodium trioxocarbonate and hydrochloric acid
As a consulting engineer, you are tasked to advise on an installation of solar panels for the purpose of supplying a household that contains 1 double-door fridge, 1 x 150 L deep freezer, 1 x 65” TV, 1 x desktop computer (with 2 screens), 1 x combo internet rooter-modem and 1 water-pump used to supply a water tank (2 occupants). The above appliances should be able to operate off-grid. Please advise on what it would cost and payback period (Desired storage autonomy 36 hrs).
The absorber surface of a solar collector is made of aluminum coated with black nickel oxide (α1 = 0.92 and ε = 0.08). The collector is to be installed in Stellenbosch (South Africa). The air and the effective sky temperatures are 20 and 7°C, respectively, and the convection heat transfer coefficient is 15 W/m2·K. For an absorber surface temperature of 60°C, determine the net rate of solar energy delivered by the absorber plate to the water circulating behind it.
#339914 on Dec 2023