def test_diffusehorizontal():
"""py.test for diffusehorizontal"""
data = ((0.289, 2.641, 90, 21, 100.490533), # taub, taud, alt, daynum, Eb
)
for taub, taud, alt, daynum, Eb in data:
result = clearskyrad.diffusehorizontal(taub, taud, alt, daynum=daynum)
assert almostequal(result, Eb)
def test_weatherdata():
"""py.test with real weather data"""
# from USA_AZ_Phoenix.722780_TMY2.ddy
# datetime = month, date, hour = 1, 24, 13
# ET Horizontal Radiation = 852
# ET Direct Normal radiation = 1412
# Direct Normal Radiation = 969
# Diffuse horizontal radiation = 71
# Total Sky cover = 0
# Opaque sky cover = 0
# from USA_AZ_Phoenix.722780_TMY2.stat
# Jan taub = 0.306
# Jan taud = 2.534
# Feb taub = 0.317
# Feb taud = 2.463
# from <http://www.esrl.noaa.gov/gmd/grad/solcalc/azel.html>
# solar azimuth = 185.8 degrees
# solar altitude = 37.36 degrees
Eb = 969
taub = 0.306
taud = 2.534
alt = 37.36
daynum = 24
result = clearskyrad.directnormal(taub, taud, alt, daynum=daynum)
# assert result == Eb
Ed = 71
result = clearskyrad.diffusehorizontal(taub, taud, alt, daynum=daynum)
# assert result == Ed
# other days
# 1975, 2, 16, 14
Eb = 816
taub = 0.317
taud = 2.463
alt = 40.67
daynum = 24
thedate = datetime(1975, 2, 16)
result = clearskyrad.directnormal(taub, taud, alt, thedate=thedate)
# assert result == Eb
Ed = 152
result = clearskyrad.diffusehorizontal(taub, taud, alt, thedate=thedate)
assert result == Ed
spadict['azm_rotation'] = 0
spadict['atmos_refract'] = 0.5667 # typical value
statfilename = './weatherfiles/USA_AZ_Phoenix/USA_AZ_Phoenix.722780_TMY2.stat'
taubs, tauds = clearskyrad.tau(open(statfilename))
# for m in range(1, 13):
for m in range(1, 13):
for d in range(1, calendar.monthrange(spadict['year'], m)[1] + 1):
# for d in range(1, 25):
for h in range(1, 25):
spadict['month'] = m
spadict['day'] = d
spadict['hour'] = h
try:
sun = spabase.spacalc(spadict)
alt = 90 - sun['zenith']
taub, taud = taubs[m -1], tauds[m -1]
thedate = datetime(spadict['year'], m, d)
if alt <= 0:
Eb = 0
Ed = 0
else:
Eb = clearskyrad.directnormal(taub, taud, alt, thedate=thedate)
Ed = clearskyrad.diffusehorizontal(taub, taud, alt, thedate=thedate)
print '%s, %s, %s, %s, %s, %s' % (m, d, h, alt, Eb, Ed)
# print m, d, h, 90 - sun['zenith']
# print sun
except spabase.UnknownError:
raise spabase.DataError