LEARNING TARGET: I can design a more efficient solar energy collector.

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Presentation transcript:

LEARNING TARGET: I can design a more efficient solar energy collector. Feb 28 / 29 Act D 69 Solar Heating LEARNING TARGET: I can design a more efficient solar energy collector. CH Q What is the efficiency of a solar energy collector? VOCAB: Calories; efficiency; passive solar heating

energy needed to raise 1g (or mL) of water 1°C Calories Efficiency Passive solar heating ratio of energy released compared to energy going into system Sun thermal energy transfer without machines

PROCEDURE: Read on pg. D 89-93 and summarize PROCEDURE AND DATA MATERIALS: PROCEDURE: Read on pg. D 89-93 and summarize DATA: WS 69.1 Solar Heating WS 69.2 Improved Solar Heating Design Next slide – lab hints

DO NOT RUN / CONNECT THE PUMP WITHOUT WATER TO GO THROUGH IT ! DAY 1 *change use 200mL water Part A: Gathering the Data Part B: Calculating Efficiency WARNING! DO NOT RUN / CONNECT THE PUMP WITHOUT WATER TO GO THROUGH IT ! If pump doesn't work – pull the hose out just a little bit to avoid hitting the propeller inside. Next Slide – lab set up

DAY 1: Set-Up

TIME (min) TEMP: tested ( C ) TEMPERATURE: class control ( C ) 21 1 21 2 3 4 22 5 22 6 7 8 9 23 10 11 12 13 24 14 15

PART B: Calculate efficiency of Day 1.... Check your math! 200 A. B. ∏r2 / 2 = cm2 C. B. A. C. Turn in paper after going over it!!!!

11 degrees C X 100 mL = 1,100 calories Energy transferred to water (calories) 11 degrees C X 100 mL = 1,100 calories Area of solar heater (cm2) 180 cm2 Energy transferred to the tubing (calories) 1.5 calories / cm2 / min X 180cm2 X 15 min = 4,050 calories Efficiency of heating system (%) 1,100 Calories 4,050 calories X 100% = 27 %

FLOWER SOLAR CELL

DAY 2 Part C: Improved Solar Heating Design

DAY 2 Part C: Improved Solar Heating Design Possible Ideas!! Record on WS 69.2 heat for longer than 15mins dark area around tube “coil” reduce water amount increase light intensity (Watts or less distance)

DO LAB!!! Follow correct protocol. – GET LAB READY Quickly and quietly You did this last class, however this lab is to make improvements. You will have 25 minutes to Set up, Collect your data, and Clean up

NOW!!!! Calculate efficiency of Day 2.... Check your math! 200 A. B. ∏r2 / 2 = cm2 C. B. A. C. Turn in paper after going over it!!!!

increases POST DISCUSSION Relationships between your data and calculations: The longer the water circulates through the system, the … As the temperature of the water increases, the rate of change… Warmer it becomes. (The temp increases) Slows down. - As intensity increases (closer distance) efficiency… increases

ANALYSIS - Discuss and answer Q 2 on pg. D 93 ANS CHALLENGE Q What is the efficiency of a solar energy collector? A: ~25%, but with modification up to 30%? HOMEWORK Catch up on Journals – Complete Analysis Q’s