quiz lesson 9

# B summer months keep the draperies

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Unformatted text preview: (SEER=10) with a new 2 ton air condi3oner (SEER=14), which costs \$473 more, what is the payback period? Assume that the air condi3oner is operated for about 2000 hrs in a year and the cost of electricity is 7 cents per kWh. (5 Points) Correct B ) 4.93 years We know that, 1 ton of air condi3oning = 12000 BTU/hr Old air condi3oner Power consump3on = 3 x 12000 / 8 = 4500 wa\s Energy cost = 4500 x 2000 / 1000 x 9.2 / 100 = \$828 New air condi3oner Power consump3on = 3 x 12000 / 15 = 2400 wa\s Energy cost =2400 x 2000 / 1000 x 9.2 / 100 = 441.6 Savings in energy cost = 336 - 239.99 = \$96 Pay Back period = 500 /386.4 = 4.927 yrs Cooling costs are ________ for the basement (in ground) compared to the upper ﬂoors. Correct B ) lower Warmer air raises to the top and cold air descends to the bo\om. So, basement remains cooler than upper ﬂoors. SEER is the eﬃciency of a central air condi3oner. When the eﬃciency is higher it consumes less energy A home that is dry during the winter must be kept warmer to be comfortable than one with a higher humidity level. Correct A ) T RUE A home that is dry during the winter must be kept warmer to be comfortable than one with a higher humidity level. __________ will change the amount of air condi3oning required. Correct D ) All of the above The number of occupants, the ac3vity of the occupants, the number of appliances opera3ng in the room are some of the factors that inﬂuence the amount of air condi3oning required The compressor is considered to be the "heart of the air condi3oning system." Correct A ) T RUE The compressor is considered to be the "heart of the air condi3oning system." To achieve the same comfort level, a home that is dry during winter must be kept warmer than one with a higher humidity level. Correct A ) T RUE To achieve the same comfort level, a home that is dry during winter must be kept warmer than one with a higher humidity level. From an energy eﬃcient point of view, an air condi3oner should be mounted on Correct B ) the shady side of the house From an energy eﬃcient point of view, an air condi3oner should be mounted on the shady side of the house Size of air condi3o...
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