Answer Happy

Question 2 (1 point) A control volume system and several energy transfers are indicated in the diagram below. In the diagram, energy transfer EE is shown with its arrow pointing outward. However, sometimes the actual direction of that transfer is inward. When the actual direction of a transfer is the same as its arrow then it is a positive number, or if the actual direction is opposite to the arrow then it is a negative number. ÉA Ев CV Your Answer: ÉE Answer Ес Consider a particular time period when: ÉA 199 W. ÉB= 260 W, Ec= 113 W, ED= = -77 W. ÉD What value of EE (W) is needed to maintain steady-state in the CV system? Make sure to include a negative sign if appropriate.
Question 3 (1 point) A natural-gas fired boiler operates at annual efficiency = 80% with annual heating load = 200,000 MJ. Estimate the annual GHG emissions in kg CO₂e. (Round your answer to the nearest kg.) For natural gas, use heating value = 38 MJ/m³ and GHG emissions factor = 1.9 kg CO₂e/m³. Your Answer: Answer