The Tool & Equipment Co.

Comments on How Exterior Paints and Interior Paints Can Play Roles in Conserving Energy
 

Test Preformed By:

GEOSCIENCE LTD
620 Marindustry Drive
San Diego, California 92121

I. ENERGY SAVINGS PRINCIPLES

• There are two types of paint that can assist in saving energy in residential and industrial buildings. One relates to the reduction of the solar load to roofs and to exterior walls. The second one relates to interior room wall paints. These features are discussed below.
• 
  Solar Load Reduction Paints
• When the sun shines on exterior surfaces of commercial and residential buildings, the solar load can be high enough in the summertime to require the use of excessive air conditioning in interior rooms in order to have comfortable conditions. If the exterior paints or coatings have reasonably good solar reflectivities, however, then the solar load being absorbed by the building would be reduced and the air conditioning required would also be less, thereby conserving energy.
• 
  Interior Room Heat Transfer Reduction Paints
• If the emissivities in the infrared region of interior wall coatings or paints are lower than ordinary paints, then the radiant hat transfer from the warmer outer walls of rooms would be less in the summertime, thus giving greater comfort to persons in the rooms because the radiant heat fluxes would be less, and there would be less warming of ambient room temperatures. Under these conditions, energy would be conserved because less air conditioning would be required.
  Under wintertime conditions, where furnace heating is normally required in residences and buildings, if the interior outer wall paints have lower emissivities than normal paints have, ambient room temperature cooling would be less and the comfort level of persons in the rooms would be greater because the radiation heat loss to cold, interior outer walls would be less, and the ambient air temperature reduction would be less. Thus, again, as in the summertime case, energy can be conserved if low emissivity interior wall paints are utilized.

• In the case of solar load reduction, the energy savings accrued by using INSULADD^® additive paint rather than ordinary house paint would be,
• (0.81 - 0.70) ÷ (1 -0.70) X 100 = 37%
• The radiant heat flux gain from a warm interior surface of an outer wall of a residence or building in the summertime is reduced if the infrared emissivity is reduced by a paint additive like INSULADD^®. Specifically, the percent energy savings in this flux term would be,
• (0.85 – 0.75) ÷ (0.85) X 100 = 11.8%
• The radiant heat flux loss to a cold interior surface of an outer wall of a residence or building in the wintertime is reduced if the infrared emissivity is reduced by a paint additive like INSULADD^®. Again, the energy savings in this flux term would be about 11.8%.

Infrared Emissivity Test Results
MATERIAL INVESTIGATED:	MEASUREME NT METHOD:	RESULT S:*
Dry wall painted with two coats of latex house paint	ASTM E-408	85% (0.85)
Dry wall painted with two coats of latex house paint with Insuladd (32 fluid oz. per gallon of paint)	ASTM E-408	75% (0.75)

Solar Reflectivity Test Results
Dry wall painted with two coats of latex house paint	ASTM E-1918†	75% (0.75)‡
Dry wall painted with two coats of latex house paint with Insuladd (32 fluid oz. per gallon of paint)	ASTM E-1918†	81% (0.81)‡

*Details of the investigation are not included in this Property Certification; the results presented here apply only to the samples tested.

†incident and reflected solar radiations are measured using 3' X 3' coated test samples. The procedures of ASTM E-1918 are similar to those of the CEC shading coefficient test method under Title 25 (Chapter 1, Subchapter 1, Article 5). A number of measurements are made over the period 11:00 A.M. to 3:00 P.M. under clear sky conditions.

‡ Please note that the incident solar radiant fluxes measured by the radiometer are in good agreement with ASHRAE solar radiation values for our latitude, the time of the year and time of the day.

before	Gas $	Electric$		after	Gas $	Electric$
Oct-99	11	49		Oct-00	16	51
Nov-99	42	42		Nov-00	48	55
Dec-99	114	52		Dec-00	60	51
Jan-00	98	55		1-Jan	93	54
Feb-00	51	47		1-Feb	44	37
Mar-00	64	44		1-Mar	30	29
Apr-00	16	43		1-Apr	19	27
May-00	11	53		1-May	12	30
Jun-00	8	50		1-Jun	8	37
Jul-00	10	61		1-Jul	7	51
Aug-00	8	61		1-Aug	6	53
Sep-00	9	55		1-Sep	6	42

Comparison of the utility usage before and after painting the exterior of a home in Stockton,
California with 2 coats of Insuladd^® and Latex house paint.
Primary energy usage is gas heat in the winter months.

Energy Savings of over 15% is shown in this report.

Data is in US dollars and is taken directly from the utility bills sent to the home owner by Pacific Gas and Electric.
 

GAS BEFORE	11	42	114	98	51	64	16	11	8	10	8	9
ELECTRICAL BEFORE	49	42	52	55	47	44	43	53	50	61	61	55
GAS AFTER	16	48	60	93	44	30	19	12	8	7	5	5
ELECTRICAL AFTER	51	55	51	54	37	29	27	30	37	51	53	42

Data is in US dollars and is taken directly from the utility bills sent to the home owner by Pacific Gas and Electric (California)
 

MON TH	2000 KWH	2001 KWH		Kwh Reduction	Air Temp difference
				2000 to 2001	2001 compared to 2000
JUNE	1422	1335		-87	+1 deg
JULY	2334	1903		-431	+3 deg
AUGU ST	2233	2020		-213	+2 deg
SEPT.	2601	2261		-340	+3 deg
OCT.	1932	1747		185	same

TWO STORY BRICK AND MASONITE HOME LOCATED IN LEXINGTON, KY.
EXTERIOR WAS PAINTED APRIL 2001 DATA TAKEN OFF COPIES OF UTILITY BILLS SUPPLIED BY HOMEOWNER FROM UTILITY COMPANY (KU)

ELECTRICAL USAGE SHOWS PRIMARY AIR-CONDITIONING MONTHS.

2001 SUMMERTIME AIR TEMPERATURE AVERAGED 2 DEG. F HOTTER PER DAY THAN 2000 AIR TEMPERATURES.

ENERGY SAVINGS IS 12% OVER PREVIOUS YEAR (This figure would be even greater if adjusted for the hotter summer temperatures of 2001

 

INSULADD^® gives paint unique energy savings properties that resist and reflect heat while dissipating it. The hollow ceramic microspheres reflective quality affects the warming phenomenon called "Mean Radiant Temperature," where heat waves from a source such as direct sunlight cause a person to feel warmer even though the actual air temperature is no different between a shady and sunny location. It is the molecular friction within the skin caused by the sun's radiant energy waves which makes the body feel warmer.

Insuladd^® can reduce heating & A/C bills 40%!

Don't just paint when you can INSULATE!

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