New TMY Weather Data

Larry Palmiter and Ben LarsonAugust 4, 2008

Ecotope Inc.

Presented at Regional Technical Forum Portland, Oregon, August 5, 2008

TMY Datasets

• The National Renewable Energy Laboratory (NREL) releases Typical Meteorological Year (TMY) weather data every 15 years. The latest dataset, TMY3, was released in May 2008

• The TMY datasets are:– TMY1 1952-1975 234 Sites 22 NW Sites– TMY2 1961-1990 239 Sites 25 NW Sites– TMY3 1991-2005 1020 Sites 77 NW Sites

• NW sites limited to WA, OR, ID, and MT

Northwest TMY3 Data

• There are two important features of the Northwest TMY3 data:– There is a large increase in the number of stations

giving much better geographical coverage. – The TMY3 data show reduced heating degree days

and actual heating loads in nearly all Northwest locations. The cooling degree days and loads show less change.

Northwest TMY3 Sites

State City TMY2 HDD65 CDD65 Heat kWh Cool kWh Cool % Latent % State City TMY2 HDD65 CDD65 Heat kWh Cool kWh Cool % Latent %CA Alturas 6457 317 7219 1619 18.3 9.8 ID Boise * 5396 756 5945 1896 24.2 7.8CA CrescentCity 4893 0 2981 184 5.8 25 ID Burley 6224 627 7119 1880 20.9 18.2CA Yreka 5098 566 5076 1841 26.6 9.8 ID Caldwell 5809 630 6764 1937 22.3 12.8UT Ogden 5829 1087 6530 2479 27.5 13.2 ID CoeurdAlene 6897 343 8529 1248 12.8 16.3UT OgdenAFB 6013 964 7026 2174 23.6 8.6 ID Hailey 7159 679 9462 1719 15.4 9UT SaltLake * 5349 1118 5742 2425 29.7 13.8 ID IdahoFalls 7773 245 11108 1329 10.7 15.4UT WendoverUSAF 5977 1218 6826 2363 25.7 8 ID Lewiston 5458 885 5875 2024 25.6 12.3MT Billings * 6732 548 9733 1578 14 15.3 ID MaladCity 6683 546 8167 1893 18.8 12MT Bozeman 8356 282 12641 1181 8.5 16.5 ID MountainHome 6115 832 7548 2070 21.5 4.5MT Butte 9089 100 13119 793 5.7 14.6 ID Pocatello * 7099 393 9416 1551 14.1 11.7MT CutBank * 8192 86 11818 752 6 12.6 ID Salmon 7481 308 9804 1244 11.3 15MT Glasgow * 8164 503 14953 1514 9.2 18.3 ID SodaSprings 8438 197 11726 1207 9.3 13.4MT Glendive 8676 554 15710 1571 9.1 17.3 ID TwinFalls 6147 733 6899 1943 22 14.8MT GreatFalls * 7855 343 12637 1169 8.5 13 WA Bellingham 5765 23 5429 532 8.9 24.8MT Havre 8218 431 14019 1439 9.3 14.2 WA Bremerton 5536 113 5059 713 12.4 20.5MT Helena * 7587 319 10889 1101 9.2 13.4 WA Ephrata 5576 882 6537 2229 25.4 9.9MT Kalispell * 7928 127 10928 941 7.9 15.7 WA FairchildAFB 7371 394 9642 1169 10.8 7.1MT Lewistown * 8013 107 11167 830 6.9 20 WA FtLewis 5571 106 5906 717 10.8 19.2MT Livingston 7110 370 8874 1325 13 13.9 WA Hanford 5670 1006 7587 2244 22.8 5.1MT MilesCity * 7618 648 13189 1842 12.3 17.5 WA Hoquiam 5243 21 4204 406 8.8 24.6MT Missoula * 7323 269 9625 1113 10.4 15.6 WA Kelso 4682 115 4200 798 16 22.7MT Sidney 9406 413 19660 1430 6.8 25.4 WA MosesLake 5438 638 6085 2050 25.2 13.4MT WolfPoint 8982 251 17236 1082 5.9 25.4 WA Olympia * 5332 118 5139 748 12.7 20.5NV Elko * 7072 406 9130 1500 14.1 5.9 WA Pasco 4916 708 5344 2311 30.2 14.4NV Winnemucca * 6156 567 7409 2069 21.8 7.7 WA PortAngeles 5945 12 5303 391 6.9 21OR Astoria * 4933 48 3907 432 10 28.5 WA Pullman 6485 234 7139 1292 15.3 15.9OR Aurora 4274 328 3739 1285 25.6 20.3 WA Quillayute * 5682 18 4962 295 5.6 22OR Baker 7147 229 8810 1279 12.7 17.7 WA Renton 4379 216 3801 973 20.4 19.9OR Burns * 7199 230 8725 1187 12 10.6 WA Seattle 4641 128 4114 763 15.6 19.8OR Corvallis 4261 406 3802 1466 27.8 19 WA SeattleBoeing 4368 170 3666 839 18.6 19.5OR Eugene * 4804 295 4566 1247 21.5 19.6 WA Snohomish 5096 71 4324 601 12.2 23.8OR Hillsboro 4797 212 4267 1157 21.3 21.3 WA Spokane * 6716 341 7989 1189 13 9.5OR KlamathFalls 6763 190 7420 1280 14.7 14.7 WA SpokaneFelts 6200 495 6885 1543 18.3 14.3OR LaGrande 6162 330 6518 1290 16.5 12.6 WA StampedePass 8897 81 10369 499 4.6 20.2OR Lakeview 7095 198 8096 1169 12.6 9.1 WA TacomaMcchord 5671 141 5929 753 11.3 19.5OR Medford * 4530 601 4501 1786 28.4 13.7 WA TacomaNarrows 4783 129 4071 709 14.8 17.9OR NorthBend * 4525 0 3114 350 10.1 22.3 WA TheDalles 4501 879 4509 2160 32.4 15.7OR Pendleton * 5205 585 5416 1607 22.9 9.5 WA Toledo 5853 81 6367 565 8.2 23OR Portland * 4187 367 3776 1247 24.8 21.8 WA WallaWalla 4839 835 4939 1968 28.5 12.2OR Redmond * 6583 204 7155 1141 13.8 9.6 WA Wenatchee 5753 867 6721 1984 22.8 13.8OR Roseburg 3797 403 3267 1416 30.2 20.1 WA Whidbey 5513 0 4493 319 6.6 22.9OR Salem * 4582 275 4331 1272 22.7 17.8 WA Yakima * 6041 430 7395 1567 17.5 11.4OR SextonSummit 5656 364 5139 1207 19 20 WY Evanston 8335 188 11670 1046 8.2 15.8OR Troutdale 4319 368 3838 1263 24.8 17.9 WY JacksonHole 9664 14 14266 611 4.1 14.7

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Heat Pump Loads for TMY3 Weather

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Heating Degree Days Base 65 for TMY2 & TMY3 Weather

TMY2 TMY3

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Cooling Degree Days Base 65 for TMY2 & TMY3 Weather

TMY2 TMY3

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Change in Heating Degree Days from TMY2 to TMY3 Weather

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Percent Change in Heating Degree Days from TMY2 to TMY3 Weather

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Change in Cooling Degree Days from TMY2 to TMY3 Weather

Base 65 Base 60

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Percent Change in Cooling Degree Days from TMY2 to TMY3 Weather

Base 65 Base 60

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Cha

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Change in Heating Input w/ Ducts from TMY2 to TMY3

Furnace Heat Pump

-20

-15

-10

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5

Cha

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in H

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put

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Mis

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Percent Change in Heating Input w/ Ducts from TMY2 to TMY3

Heat Pump Furnace

-1,5

00

-1,0

00

-50

00

50

0

Cha

nge

in H

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g In

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Change in Heating Input No Ducts from TMY2 to TMY3

Furnace Heat Pump

-15

-10

-50

5

Cha

nge

in H

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g In

put

(%)

Mis

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la

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len

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Po

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Pe

nd

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Percent Change in Heating Input No Ducts from TMY2 to TMY3

Heat Pump Furnace

-15

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Per

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Percent Change in HDD60 and Heating Input from TMY2 to TMY3

HDD60 Furnace

-200

-100

010

020

0C

hang

e in

Coo

ling

Inpu

t (k

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Le

wis

tow

n

Pe

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oka

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kim

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Bo

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ne

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lisp

ell

Po

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Sa

lem

MIle

sCity

Po

cate

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Change in Cooling Input from TMY2 to TMY3 Weather

Heat Pump Ducts Heat Pump No Ducts

-20

-10

010

20C

hang

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Coo

ling

Inpu

t (%

)

Le

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tow

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Pe

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Bu

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Eu

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Cu

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Po

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Po

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lem

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lisp

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ori

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Percent Change in Cooling Input from TMY2 to TMY3 Weather

Heat Pump Ducts Heat Pump No Ducts

-40

-20

020

40

Per

cent

Cha

nge

Le

wis

tow

n

Pe

nd

leto

n

Bu

rns

Oly

mp

ia

No

rth

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oka

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kim

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Se

att

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la

Re

dm

on

d

He

len

a

Bo

ise

Gla

sgo

w

MIle

sCity

Eu

ge

ne

Po

cate

llo

Po

rtla

nd

Sa

lem

Cu

tba

nk

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ori

a

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lisp

ell

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illa

yute

Percent Change in CDD60 and Cooling Input from TMY2 to TMY3

CDD60 Heat Pump