nticimum points 100 Formula sheet: (DD)24 Part one: concentual problems (a) True
ID: 1867408 • Letter: N
Question
nticimum points 100 Formula sheet: (DD)24 Part one: concentual problems (a) True ("T) or False ("F") questions (1) Compared to the sequential execution of building energy programs, solving all models simultancously is more accurate but requires more expensive computational cost (2) Degree-day methods can be used if the inside temperature and interior gains fluctuate. (3) For degree-da y methods, the short-term calculations are more accurate than the long-term calculations (4) Heating is only needed when the outside temperature is lower than the balance-point temperature (5) We can't work with degree-day method if the building condition and Tn change with T. 20 points) > (b) What is balance temperature? and give a rough estimation of it (1o)Explanation / Answer
a) 2) False, degree day method can be accurate if the indoor temperature and internal gains are constant.
3)True, Short term methods calculations are more accurate than long term calculation for degree day method.
4)True, When the outside air temperature is lower than the balanced point outdoor temperature.
b) Building balance point temperature is outdoor temperature of air when both heat gain and heat loss are equal.
5) We cant work with degree day method if
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