Dwellsol
Design and Consulting
Related Reading:
Adding Climate
Here we need to research local climate data in order to construct the hottest day
of the year, this will be the design benchmark of the worst possible situation. For
this we need to know the normal daily temperatures for the summer months, as
well as the relative humidity throughout a typical summer day. I will use
Bakersfield California as an example.
Doing some web searching I can find that the daily information is thus:
The design condition is from ASHRAE 1997 Handbook of Fundamentals. From
the chart we can see that on a summer day in Bakersfield, high mass in
combination with night ventilation could be an effective means of cooling a
building. Evaporative cooling appears to meat the criteria, strictly speaking,
however, the July and August proximity to its threshold makes it potentially less
effective than High Mass/ Night Ventilation. So now, how do we figure how much
mass we are going to need and how much of an effect will it have on our actual
building? Click NEXT to find out.
Month
|
Normal High Temp
|
Normal Low Temp
|
Relative Humidity Low
|
Relative Humidity High
|
June
|
90
|
62
|
25
|
50
|
July
|
98
|
70
|
23
|
49
|
August
|
95
|
68
|
25
|
53
|
|
We will use these numbers to graph a line on our chart. Start with a point at the
normal low temperature and the high humidity for each month. Place another
each month and you get something that looks like this.