Problem 10 A homeowner is trying to decide between a high-efficiency natural gas furnace with an efficiency of 95 percent and a ground-source heat pump with a COP of 3.3. The unit costs of electricity and natural gas are $0.112/kWh and $1.44/therm (1 therm = 105, 500 kJ). Determine which system will have a lower energy cost.

Please help solve both for my homework. Due soon

In a refrigeration cycle that is used to cool products of a grocery store has an efficiency of 46 %. The total heat load of the grocery store in weekdays is 50 kW while in weekends is 100 kW. If the system uses electricity that could power the store within the whole month. What will be its consumption for a month? * 1304 Kw O 1.30 Kw 600 kW O 150 Kw

What is the energy collected from the sun in watts /area as measured in the pyranometer. O a. solar battery O b. irradiance O c. solar inverter o d. voltage

Q1: What is the primary process of converting solar energy into other form of energy, explain and give an example of each one of them? Q2: Determine the Sun's altitude angle , azimuth angle, and zenith angle at 5.00 P.M on December 15, 2017 for a location at 24.85° N latitude. Q3: Compare the power generated by the two shown systems 1 and 2, if each turbine have air velocity in that area was V= 5 m/sec and the air density p=1.19 kg/m³m while in system 2 to increase the air velocity we uses a truncated cone of area ration A1/A2=4. blades 5 m length, while the

Find the energy required to increase the room temperature of a coffee in a cup to a temperature of 60°C.

Solve via mechanical energy balance equation

Replacing incandescent lights with energy-efficient fluorescent lights can reduce the lighting energy consumption to one-fourth of what it was before. The energy consumed by the lamps is eventually converted to heat, and thus switching to energy-efficient lighting also reduces the cooling load in summer but increases the heating load in winter. Consider a building that is heated by a natural gas furnace with an efficiency of 80 percent and cooled by an air conditioner with a COP of 3.5. If electricity costs $0.12/kWh and natural gas costs $1.40/therm (1 therm = 105,500 kJ), determine if efficient lighting will increase or decrease the total energy cost of the building (a) in summer and (b) in winter.

1) Heating the water in a 55-gallon water heater requires about 2.0 x 103 kJ of energy.          a) Assume the energy came from natural gas with 80% efficiency; how many grams of natural gas are required?          b) Assume the energy came from electricity with 80% efficiency and that the electricity was produced from the combustion of coal with 30% efficiency; how many grams of coal are required?   For problem above, calculate how much CO2 in grams is emitted to the atmosphere.             For a: Use the balanced equation for the combustion of methane (CH4) to determine how many grams of CO2are produced from the amount of natural gas required.             For b: Assume that coal produces 5.25 kJ of energy per gram of CO2 produced. Calculate how much CO2 in grams is produced.