Renewable Energy

3: According to heat storage system, calculate the following a) The heat stored in 80 m³ Liquid Sodium by heating it from 150°C to 450°C. The density of Liquid Sodium is 750 kg/m³ and the specific heat of Liquid Sodium is 1260 J/kg°C. b) The Molten Salt volume requires to store 600 MWh if the is stored in Molten Salt by heating it from 150 °C to 450 °C. The density of Molten Salt is 1680 kg/m³ and the specific heat of Molten Salt is 1560 J/kg°C. c) Based on part a & b, which heat storage system has better energy density level.

8. (10%) A power plant is capable of producing electricity at a rate of 1000 MWe. If the electricity is sold for $0.0800/kWh, what revenue is lost per day if the plant is not operating?

3. (10%) A 12-V battery is connected across a device whose resistance is 30 ohms. Calculate the current in the wire. What is the power dissipated by this load?

4. (10%) How much current is drawn by a 1500-W skillet operating at 120 V?

2. (10%) What is the cost of running a 1000-W hair dryer for 45 minutes, when the cost of electricity is $0.12/kWh?

25. What is the starting address of the registers section in HCS12?

6. (10%) A heat engine takes heat from steam at 373 K and transfers the heat to the environment at 283 K. What is the maximum % efficiency of this engine?

4. (10%) How many hours will it take to heat 40.0 gal of water from 70.0 °F to 130.0 °F with a 20-kW heater? Recall 3413 Btu = 1-kWh and 1 gal of water weighs 8.33 lbs.

48. What is the status of the C and Z flags after the following code? to sin LDAA #$FF ADDA #1

7. (10%) What is the % efficiency of an engine that has 5000 J (hot) of heat added during combustion and loses 1000 J (cold) of heat in the exhaust?