Please Kindly Answer These Questions With Work 1 (348.18 KiB) Viewed 180 times
Please Kindly Answer These Questions With Work 2 (199.61 KiB) Viewed 180 times
(1) From Appendix D, find the average daily insolation in Seattle area (on a horizontal surface, in Btu/ft2/day) through a whole year. (USE ONLY THE FIRST ROW) Seattle, WA 252 471 917 1375 1664 1724 1805 1617 1129 638 325 47° 36' 420 710 1170 1400 1514 1470 1550 1600 1330 930 520 38.9 42.9 46.9 51.9 58.1 62.8 67.2 66.7 61.6 54 45.7 Avg Daily Insolation: 252 + 471 + 917 + 1375 + 1664 + 1724 + 1805 + 1617 + 1129 + 638 + 325 + 218 = 12135/12 mo. = 1011.25 Btu/ft2/day (2) Convert Seattle average daily insolation from Btu/ft2/day to W/m2. (132.9 W/m2) (1000w/m2 = 317 btu/ft2/hr) (3) Use your answer to last question to find the average peak sun hours in Seattle (3.19 hr) Area Under Curve = Solar Insolation 1 kW/m² 1 kW/m² Equal area under the two curves Solar Radiation Time of Day (Received during a day) Peak Sun Hours Time of Day 218 400 41.5
Peak Sun Hours (4) If a house in Seattle area installed a small solar system, and its parts and costs in year 2009 are listed in the table below. What is the daily electrical energy this solar system generates per day? The grid electricity cost in 2009 is $0.1 per kWh. What is the payback time for this solar system? Note: a PV module rated at 150 W generates 150 W of electricity under 1000 peak watts solar insolation. (1.116 kWh, 96 years) 175 W modules 2 at $750 $1500 $250 Charge regulator Inverter $850 4 at $140 $560 Batteries (golf cart, lead acid, 6 V) Misc. (mounts, wires, meters charger) Total $760 $3920 (5) The total cost of installing the same solar system in 2021 is reduced to $3000 due to the significant price cut of solar panels. The current electricity cost is $0.14 per kWh. What is the payback time if installing the solar system now? (53 years)
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!