An energy efficiency metric for residential homes was developed to provide home-owners, realtors and builders a method to rate the energy efficiency of an existing house. To accomplish this, a web-based calculator was developed, which is based on DOE2 simulations and a simplified systems model. To simplify the use of the calculator, parameters, like window U-factor, roof / wall insulation, which are normally required for simulations in existing homes are filled using statistical tables. This allows the home-owner to use the calculator with information commonly available during a real estate transaction

Culp, C.

Haberl, J.

Herbert, C.

Liu, B.

Malhotra, M.

Marshall, K.

Moss, M.

Texas A&amp;M Repository

AIM: A HOME-OWNER USABLE ENERGY CALCULATOR FOR EXISTING RESIDENTIAL HOMES  Kyle Marshall  Matt Moss Mini Malhotra  Manager of Software Development Software Developer Research Assistant   Energy Systems Laboratory   College Station, TX USA   Betty Liu Charles Culp Jeff Haberl  Assistant Research Engineer Associate Director Associate Director   Energy Systems Laboratory   College Station, TX USA    Christine Herbert   Vice President   Good Company Associates   Austin, TX USA   ABSTRACT An energy efficiency metric for residential homes was developed to provide home-owners, realtors and builders a method to rate the energy efficiency of an existing house.  To accomplish this, a web-based calculator was developed, which is based on DOE2 simulations and a simplified systems model.  To simplify the use of the calculator, parameters, like window U-factor, roof  / wall insulation, which are normally required for simulations in existing homes are filled using statistical tables. This allows the home-owner to use the calculator with information commonly available during a real estate transaction. WEB FRONT-END This application is built in two main components: the front-end that runs on the user’s browser and a server which serves the application and handles requests for simulations. The web front-end is split into several panels that the homeowner navigates to calculate their home energy use and obtain a score. HOME The Home panel is the first screen seen by the user of the application. The homeowner simply goes through each question and fills out the appropriate response. Currently, the calculator is designed to handle all the counties that are in Texas. FLOORPLAN In the Floorplan and More Floorplan panels, the homeowner describes the general geometry of the home. Also, the bedrooms and bathroom are given which are used to calculate the internal load of the home used in the yearly energy loads calculation. ROOF & ATTIC In the Roof & Attic panel, we ask for what type of roof is on the house, its color and some questions about the insulation in the attic. During the design of AIM, it was important to balance the tradeoffs between what homeowners can easily measure and what effect it had on the energy usage of the home. WINDOWS In the windows panel, the glazing for the building is determined. For each side of the building, we ask how many windows are on each side. In the simulation model, we assume that the windows are 3’x5’ so that we don’t require homeowners to measure their windows. A/C This simply asks what type of A/C is in the home. We also allow them to get credit for having a newer A/C that assumedly has a higher SEER. These assumptions are discussed further on p.3 in House Characteristics by Age. ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 HEATER On this panel, we ask similar questions for the heater and the water heater. Similar assumptions are made as in the A/C section. SUMMARY Once the summary panel is reached by the homeowner, a request is made to the server with all the information given in the prior forms. The server transforms these inputs into a DOE-2 input file and runs a yearly simulation with the proper weather based on the county given.  Once the yearly annual energy loads are calculated, the A/C, heater, and water heater energy usage are calculated based upon their assumed efficiencies which are in turn dependent upon the age given by the homeowner.  The score is then calculated based upon the annual energy usage of the A/C, heater, and water heater. Figure 1. The home panel  ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 Figure 2. The floorplan panel HOUSE CHARACTERISTICS BY AGE OF THE HOUSE The characteristics of a residential house by the year of construction were culled from the following sources: • 2000/2001 IECC, 2006 IECC: for building energy code values during 2001-2005 and 2006 onwards, respectively • NAHB Housing Survey Data (1997-2004): provided wall and ceiling insulation and window type during 1997-2004 for East TX and West TX. These values are extrapolated for years prior and after 1997-2004. • ASHRAE Fundamentals: provided generic U-value and SHGC of windows for window types obtained from NAHB data • Home Energy Saver: for HVAC and DHW system efficiencies • FSEC publications for air infiltration  REFERENCES Chan, W., Price, P., Sohn, M., and Gadgil, A., “Analysis of US Residential Air Leakage Database”. Lawrence Berkeley National Laboratory Report No. 53367.  Cummings, James. B. and Charles R. Withers, "Best Practice for the Location of Air and Thermal Boundaries in Small Commercial Buildings", Proceedings of 12th Annual Symposium on Improving Building Systems in Hot and Humid Climates, San Antonio, TX, May 2000.  Cummings, J. B., Tooley, J. J., Moyer, N. A. and Dunsmore, R., "Impacts of Duct Leakage on Infiltration Rates, Space Conditioning Energy Use, and Peak Electrical Demand in Florida Homes," Proceedings of the ACEEE 1990 Summer Study, Pacific Grove, CA, August 1990.  ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 Cummings, J.B., Tooley, J.Jr., Moyer N., "Investigation of Air Distribution System Leakage and Its Impacts in Central Florida Homes", Prepared for the Governor's Energy Office, FSEC-CR-397-91, January 31, 1991. Figure 3. The more floorplan panel  Mills, E.. et al. 2007. "Home Energy Saver: Documentation of Calculation Methodology, Input Data, and Infrastructure." Lawrence Berkeley National Laboratory Report No. 51938.   ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009   Figure 4. The roof and attic panel ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009   Figure 5. The windows panel ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009   Figure 6. The A/C panel ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009   Figure 7. The heater panel. ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009    Figure 8. The summary panel ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 Table 1. House characteristics by age of the house1 2 Elec. Furn. (AFUE)Elec. HP (HSPF)Gas Furn. (AFUE)Central AC (SEER)Elec. HP (SEER)Electric (EF) NG (EF)1970 98 3.74 60.00 6.50 5.50 79.8 47.41971 98 3.98 61.35 6.58 5.86 79.8 47.41972 98 4.22 62.70 6.66 6.21 79.8 47.41973 98 4.22 62.70 6.75 6.21 79.8 47.41974 98 4.22 62.70 6.85 6.21 79.8 47.41975 98 4.22 65.83 6.97 6.21 79.8 47.41976 98 4.67 66.12 7.03 6.87 79.9 47.51977 98 4.69 66.42 7.13 6.89 79.9 47.51978 98 4.92 66.71 7.34 7.24 80.0 47.61979 98 4.99 68.66 7.47 7.34 80.1 47.61980 98 5.11 70.60 7.55 7.51 80.2 47.71981 98 5.24 70.44 7.78 7.70 80.3 47.81982 98 5.30 70.28 8.31 7.79 80.4 47.91983 98 5.60 70.13 8.43 8.23 80.6 48.01984 98 5.75 72.62 8.66 8.45 80.9 48.11985 98 5.82 72.89 8.82 8.56 81.2 48.31986 98 5.92 73.73 8.87 8.70 81.5 48.41987 98 6.07 74.33 8.97 8.93 81.9 48.61988 98 6.21 74.86 9.11 9.13 82.3 48.81989 98 6.30 74.67 9.25 9.26 82.8 49.01990 98 6.43 76.70 9.31 9.46 83.2 49.21991 98 6.64 77.54 9.49 9.77 83.7 49.41992 98 7.21 82.08 10.46 10.60 84.2 49.61993 98 7.38 82.41 10.56 10.86 84.6 49.81994 98 7.44 82.43 10.61 10.94 85.0 49.91995 98 7.46 82.33 10.68 10.97 85.4 50.01996 98 7.48 82.66 10.68 11.00 85.7 50.11997 98 7.46 82.86 10.66 10.97 85.7 50.11998 98 7.68 82.62 10.92 11.29 85.7 50.11999 98 7.68 82.63 10.96 11.29 85.7 50.12000 98 7.62 82.62 10.95 11.21 85.7 50.12001 98 7.68 83.15 11.07 11.30 max[85.7, f1(V)] max (50.1, f2(V))2002 98 7.69 83.15 11.07 11.31 max[85.7, f1(V)] max (50.1, f2(V))2003 98 7.69 83.15 11.07 11.31 max[85.7, f1(V)] max (50.1, f2(V))2004 98 7.69 83.15 11.07 11.31 max[90, f1(V)] max (55, f2(V))2005 98 7.69 83.15 11.07 11.31 max[90, f1(V)] max (55, f2(V))2006 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))2007 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))2008 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))Year of Const.Heating System Cooling System DHW System [1]                                                            1 DHW System Energy Factor: f1(V) = 0.93 - 0.00132V (Electric); f2(V) = 0.62 - 0.0019V (Gas) 2 Air Infiltration (ACH) = Normalized Leakage x Weather Factor (location dependent, from ASHRAE 136) ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 Table 2. House characteristics by age of the house (cont.)3 4 5 Air Infil. [2]Wall Cavity R-value [3,4]Normalized LeakageEast and West TXEast TX West TX East TX West TX East TX West TX1970 0.67 0 19 19 1.27 1.27 0.75 0.751971 0.67 0 19 19 1.27 1.27 0.75 0.751972 0.67 0 19 19 1.27 1.27 0.75 0.751973 0.67 0 19 19 1.27 1.27 0.75 0.751974 0.67 0 19 19 1.27 1.27 0.75 0.751975 0.67 0 19 19 1.27 1.27 0.75 0.751976 0.67 11 19 19 1.27 1.27 0.75 0.751977 0.67 11 19 19 1.27 1.27 0.75 0.751978 0.67 11 19 19 1.27 1.27 0.75 0.751979 0.67 11 19 19 1.27 1.27 0.75 0.751980 0.60 11 19 19 1.27 1.27 0.75 0.751981 0.60 11 19 19 1.27 1.27 0.75 0.751982 0.60 11 19 19 1.27 1.27 0.75 0.751983 0.60 11 19 19 1.27 1.27 0.75 0.751984 0.60 11 19 19 1.27 1.27 0.75 0.751985 0.60 11 19 19 1.27 1.27 0.75 0.751986 0.60 11 19 19 1.27 1.27 0.75 0.751987 0.60 11 19 19 1.27 1.27 0.75 0.751988 0.60 11 19 19 1.27 1.27 0.75 0.751989 0.60 11 19 19 1.27 1.27 0.75 0.751990 0.44 11 19 19 1.27 1.27 0.75 0.751991 0.44 11 19 19 1.27 1.27 0.75 0.751992 0.44 11 19 19 1.27 1.27 0.75 0.751993 0.44 11 19 19 1.27 1.27 0.75 0.751994 0.44 11 19 19 1.27 1.27 0.75 0.751995 0.44 11 19 19 1.27 1.27 0.75 0.751996 0.44 11 19 19 1.27 1.27 0.75 0.751997 0.44 13 19 30 1.27 0.87 0.75 0.661998 0.44 13 30 30 0.87 0.87 0.66 0.661999 0.44 13 30 30 1.27 0.87 0.75 0.662000 0.44 13 22 22 0.87 0.87 0.66 0.662001 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.87,Code) min(0.87,Code) min[0.66,f3(HDD)] min[0.66,f3(HDD)]2002 0.44 max(13,Code) max(22,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]2003 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]2004 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]2005 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]2006 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)2007 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)2008 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)Year of Const.Ceiling R-value [3,4] Window U-value [3,4] Window SHGC [4,5]                                                           3 Code-specified window U-values, and wall cavity and ceiling R-values (2001-2005) vary by WWR and HDD of the location (2000/2001 IECC, Chapter 5, Table 502.2.4) 4 Code-specified window U-values and SHGC, and wall cavity and ceiling R-values (2006 onwards) vary by HDD of the location (2006 IECC, Chapter 4, Table 402.1.1) 5 Code-specified window SHGC (2001-2005): f3(HDD) = 0.4 if HDD <3,500; f3(HDD) = 0.68 if HDD >= 3,500 ESL-IC-09-11-09 Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 

AIM: A Home-Owner Usable Energy Calculator for Existing Residential Homes

Texas A&M University

AIM: A HOME-OWNER USABLE ENERGY CALCULATOR FOR EXISTING 
RESIDENTIAL HOMES 
 Kyle Marshall  Matt Moss Mini Malhotra 
 Manager of Software Development Software Developer Research Assistant 
  Energy Systems Laboratory 
  College Station, TX USA 
 
 Betty Liu Charles Culp Jeff Haberl 
 Assistant Research Engineer Associate Director Associate Director 
  Energy Systems Laboratory 
  College Station, TX USA 
 
  Christine Herbert 
  Vice President 
  Good Company Associates 
  Austin, TX USA 
 
 
ABSTRACT 
An energy efficiency metric for residential 
homes was developed to provide home-owners, 
realtors and builders a method to rate the energy 
efficiency of an existing house.  To accomplish this, a 
web-based calculator was developed, which is based 
on DOE2 simulations and a simplified systems 
model.  To simplify the use of the calculator, 
parameters, like window U-factor, roof  / wall 
insulation, which are normally required for 
simulations in existing homes are filled using 
statistical tables. This allows the home-owner to use 
the calculator with information commonly available 
during a real estate transaction. 
WEB FRONT-END 
This application is built in two main components: 
the front-end that runs on the user’s browser and a 
server which serves the application and handles 
requests for simulations. The web front-end is split 
into several panels that the homeowner navigates to 
calculate their home energy use and obtain a score. 
HOME 
The Home panel is the first screen seen by the 
user of the application. The homeowner simply goes 
through each question and fills out the appropriate 
response. Currently, the calculator is designed to 
handle all the counties that are in Texas. 
FLOORPLAN 
In the Floorplan and More Floorplan panels, the 
homeowner describes the general geometry of the 
home. Also, the bedrooms and bathroom are given 
which are used to calculate the internal load of the 
home used in the yearly energy loads calculation. 
ROOF & ATTIC 
In the Roof & Attic panel, we ask for what type 
of roof is on the house, its color and some questions 
about the insulation in the attic. During the design of 
AIM, it was important to balance the tradeoffs 
between what homeowners can easily measure and 
what effect it had on the energy usage of the home. 
WINDOWS 
In the windows panel, the glazing for the 
building is determined. For each side of the building, 
we ask how many windows are on each side. In the 
simulation model, we assume that the windows are 
3’x5’ so that we don’t require homeowners to 
measure their windows. 
A/C 
This simply asks what type of A/C is in the home. 
We also allow them to get credit for having a newer 
A/C that assumedly has a higher SEER. These 
assumptions are discussed further on p.3 in House 
Characteristics by Age. 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
HEATER 
On this panel, we ask similar questions for the 
heater and the water heater. Similar assumptions are 
made as in the A/C section. 
SUMMARY 
Once the summary panel is reached by the 
homeowner, a request is made to the server with all 
the information given in the prior forms. The server 
transforms these inputs into a DOE-2 input file and 
runs a yearly simulation with the proper weather 
based on the county given. 
 
Once the yearly annual energy loads are 
calculated, the A/C, heater, and water heater energy 
usage are calculated based upon their assumed 
efficiencies which are in turn dependent upon the age 
given by the homeowner. 
 
The score is then calculated based upon the 
annual energy usage of the A/C, heater, and water 
heater. 
Figure 1. The home panel
  
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
Figure 2. The floorplan panel 
HOUSE CHARACTERISTICS BY AGE OF THE 
HOUSE 
The characteristics of a residential house by the 
year of construction were culled from the following 
sources: 
• 2000/2001 IECC, 2006 IECC: for building 
energy code values during 2001-2005 and 
2006 onwards, respectively 
• NAHB Housing Survey Data (1997-2004): 
provided wall and ceiling insulation and 
window type during 1997-2004 for East TX 
and West TX. These values are extrapolated 
for years prior and after 1997-2004. 
• ASHRAE Fundamentals: provided generic 
U-value and SHGC of windows for window 
types obtained from NAHB data 
• Home Energy Saver: for HVAC and DHW 
system efficiencies 
• FSEC publications for air infiltration  
REFERENCES 
Chan, W., Price, P., Sohn, M., and Gadgil, A., 
“Analysis of US Residential Air Leakage 
Database”. Lawrence Berkeley National 
Laboratory Report No. 53367. 
 
Cummings, James. B. and Charles R. Withers, "Best 
Practice for the Location of Air and Thermal 
Boundaries in Small Commercial Buildings", 
Proceedings of 12th Annual Symposium on 
Improving Building Systems in Hot and Humid 
Climates, San Antonio, TX, May 2000. 
 
Cummings, J. B., Tooley, J. J., Moyer, N. A. and 
Dunsmore, R., "Impacts of Duct Leakage on 
Infiltration Rates, Space Conditioning Energy 
Use, and Peak Electrical Demand in Florida 
Homes," Proceedings of the ACEEE 1990 
Summer Study, Pacific Grove, CA, August 1990. 
 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
Cummings, J.B., Tooley, J.Jr., Moyer N., 
"Investigation of Air Distribution System 
Leakage and Its Impacts in Central Florida 
Homes", Prepared for the Governor's Energy 
Office, FSEC-CR-397-91, January 31, 1991. 
Figure 3. The more floorplan panel 
 
Mills, E.. et al. 2007. "Home Energy Saver: 
Documentation of Calculation Methodology, 
Input Data, and Infrastructure." Lawrence 
Berkeley National Laboratory Report No. 51938.   
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
  
Figure 4. The roof and attic panel 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
  
Figure 5. The windows panel 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
  
Figure 6. The A/C panel 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
  
Figure 7. The heater panel. 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
   
Figure 8. The summary panel 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
Table 1. House characteristics by age of the house1 2 
Elec. Furn. 
(AFUE)
Elec. HP 
(HSPF)
Gas Furn. 
(AFUE)
Central AC 
(SEER)
Elec. HP 
(SEER)
Electric (EF) NG (EF)
1970 98 3.74 60.00 6.50 5.50 79.8 47.4
1971 98 3.98 61.35 6.58 5.86 79.8 47.4
1972 98 4.22 62.70 6.66 6.21 79.8 47.4
1973 98 4.22 62.70 6.75 6.21 79.8 47.4
1974 98 4.22 62.70 6.85 6.21 79.8 47.4
1975 98 4.22 65.83 6.97 6.21 79.8 47.4
1976 98 4.67 66.12 7.03 6.87 79.9 47.5
1977 98 4.69 66.42 7.13 6.89 79.9 47.5
1978 98 4.92 66.71 7.34 7.24 80.0 47.6
1979 98 4.99 68.66 7.47 7.34 80.1 47.6
1980 98 5.11 70.60 7.55 7.51 80.2 47.7
1981 98 5.24 70.44 7.78 7.70 80.3 47.8
1982 98 5.30 70.28 8.31 7.79 80.4 47.9
1983 98 5.60 70.13 8.43 8.23 80.6 48.0
1984 98 5.75 72.62 8.66 8.45 80.9 48.1
1985 98 5.82 72.89 8.82 8.56 81.2 48.3
1986 98 5.92 73.73 8.87 8.70 81.5 48.4
1987 98 6.07 74.33 8.97 8.93 81.9 48.6
1988 98 6.21 74.86 9.11 9.13 82.3 48.8
1989 98 6.30 74.67 9.25 9.26 82.8 49.0
1990 98 6.43 76.70 9.31 9.46 83.2 49.2
1991 98 6.64 77.54 9.49 9.77 83.7 49.4
1992 98 7.21 82.08 10.46 10.60 84.2 49.6
1993 98 7.38 82.41 10.56 10.86 84.6 49.8
1994 98 7.44 82.43 10.61 10.94 85.0 49.9
1995 98 7.46 82.33 10.68 10.97 85.4 50.0
1996 98 7.48 82.66 10.68 11.00 85.7 50.1
1997 98 7.46 82.86 10.66 10.97 85.7 50.1
1998 98 7.68 82.62 10.92 11.29 85.7 50.1
1999 98 7.68 82.63 10.96 11.29 85.7 50.1
2000 98 7.62 82.62 10.95 11.21 85.7 50.1
2001 98 7.68 83.15 11.07 11.30 max[85.7, f1(V)] max (50.1, f2(V))
2002 98 7.69 83.15 11.07 11.31 max[85.7, f1(V)] max (50.1, f2(V))
2003 98 7.69 83.15 11.07 11.31 max[85.7, f1(V)] max (50.1, f2(V))
2004 98 7.69 83.15 11.07 11.31 max[90, f1(V)] max (55, f2(V))
2005 98 7.69 83.15 11.07 11.31 max[90, f1(V)] max (55, f2(V))
2006 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))
2007 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))
2008 98 7.70 83.15 13.00 13.00 max[90, f1(V)] max (55, f2(V))
Year of 
Const.
Heating System Cooling System DHW System [1]
  
                                                          
1 DHW System Energy Factor: f1(V) = 0.93 - 
0.00132V (Electric); f2(V) = 0.62 - 0.0019V (Gas) 
2 Air Infiltration (ACH) = Normalized Leakage x 
Weather Factor (location dependent, from ASHRAE 
136) 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 
Table 2. House characteristics by age of the house 
(cont.)3 4 5 
Air Infil. [2]
Wall Cavity R-
value [3,4]
Normalized 
Leakage
East and 
West TX
East TX West TX East TX West TX East TX West TX
1970 0.67 0 19 19 1.27 1.27 0.75 0.75
1971 0.67 0 19 19 1.27 1.27 0.75 0.75
1972 0.67 0 19 19 1.27 1.27 0.75 0.75
1973 0.67 0 19 19 1.27 1.27 0.75 0.75
1974 0.67 0 19 19 1.27 1.27 0.75 0.75
1975 0.67 0 19 19 1.27 1.27 0.75 0.75
1976 0.67 11 19 19 1.27 1.27 0.75 0.75
1977 0.67 11 19 19 1.27 1.27 0.75 0.75
1978 0.67 11 19 19 1.27 1.27 0.75 0.75
1979 0.67 11 19 19 1.27 1.27 0.75 0.75
1980 0.60 11 19 19 1.27 1.27 0.75 0.75
1981 0.60 11 19 19 1.27 1.27 0.75 0.75
1982 0.60 11 19 19 1.27 1.27 0.75 0.75
1983 0.60 11 19 19 1.27 1.27 0.75 0.75
1984 0.60 11 19 19 1.27 1.27 0.75 0.75
1985 0.60 11 19 19 1.27 1.27 0.75 0.75
1986 0.60 11 19 19 1.27 1.27 0.75 0.75
1987 0.60 11 19 19 1.27 1.27 0.75 0.75
1988 0.60 11 19 19 1.27 1.27 0.75 0.75
1989 0.60 11 19 19 1.27 1.27 0.75 0.75
1990 0.44 11 19 19 1.27 1.27 0.75 0.75
1991 0.44 11 19 19 1.27 1.27 0.75 0.75
1992 0.44 11 19 19 1.27 1.27 0.75 0.75
1993 0.44 11 19 19 1.27 1.27 0.75 0.75
1994 0.44 11 19 19 1.27 1.27 0.75 0.75
1995 0.44 11 19 19 1.27 1.27 0.75 0.75
1996 0.44 11 19 19 1.27 1.27 0.75 0.75
1997 0.44 13 19 30 1.27 0.87 0.75 0.66
1998 0.44 13 30 30 0.87 0.87 0.66 0.66
1999 0.44 13 30 30 1.27 0.87 0.75 0.66
2000 0.44 13 22 22 0.87 0.87 0.66 0.66
2001 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.87,Code) min(0.87,Code) min[0.66,f3(HDD)] min[0.66,f3(HDD)]
2002 0.44 max(13,Code) max(22,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]
2003 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]
2004 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]
2005 0.44 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min[0.48,f3(HDD)] min[0.48,f3(HDD)]
2006 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)
2007 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)
2008 0.36 max(13,Code) max(30,Code) max(30,Code) min(0.77,Code) min(0.77,Code) min(0.48,Code) min(0.48,Code)
Year of 
Const.
Ceiling R-value [3,4] Window U-value [3,4] Window SHGC [4,5]
 
                                                          
3 Code-specified window U-values, and wall 
cavity and ceiling R-values (2001-2005) vary by 
WWR and HDD of the location (2000/2001 IECC, 
Chapter 5, Table 502.2.4) 
4 Code-specified window U-values and SHGC, 
and wall cavity and ceiling R-values (2006 onwards) 
vary by HDD of the location (2006 IECC, Chapter 4, 
Table 402.1.1) 
5 Code-specified window SHGC (2001-2005): 
f3(HDD) = 0.4 if HDD <3,500; f3(HDD) = 0.68 if 
HDD >= 3,500 
ESL-IC-09-11-09 
Proceedings of the Ninth International Conference for Enhanced Building Operations, Austin, Texas, November 17 - 19, 2009 


English

http://oaktrust.library.tamu.edu/bitstream/handle/1969.1/90847/ESL-IC-09-11-09.pdf?sequence=1&isAllowed=y

AIM: A Home-Owner Usable Energy Calculator for Existing Residential Homes

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AIM: A Home-Owner Usable Energy Calculator for Existing Residential Homes

Abstract

Similar works

Full text

Available Versions

Texas A&amp;M Repository

Texas A&M University

Texas A&M Repository