A 20 kW electric roof top A/C unit (RTU) is 10 years old, and has a COP of 2.0 . It operates at full load for 3,000 hours a year. The electric cost is $0.10 per kWh. If this to unit to be replaced with a new 20 kw, what is the minimum value of COP for the ?new unit to reach an annual savings of $1,500 3.5 4.0 4.5 Can not be determined

Solar panel measurement is continuous; one side is about 10 meters and the other is about 16 meters.   What is the area covered by the solar panels (in square meters)?   How much solar power is coming to the solar panels? (state your assumptions)   Assume each solar panel is rated for about 100 W of generating capacity. What is the total generating capacity of the whole solar garden?   How much power is being generated each day during this period? (based on the table below)   What does that indicate about the efficiency of these panels in converting solar energy into electricity?  Compare to your answers for B and C. Here are some meter readings and the date: Date kWh   6-Oct 12536   14-Oct 13053   8-Oct 12653   12-Oct 12934   20-Oct 13216 Before class 20-Oct 13218 After class 27-Oct 13423 After class For extra credit, guess the meter reading on Thursday, November 5 at 7:45 am.

1. The present share of renewable energy sources among the primary energy sources is around: 17%. 24%. 45%. 75 %.