Energy Saving Effect Simulation in a Model House

Ecology

It is one the most important subjects to reduce emission of CO2 in conjunction with preventive measures of the green house effect. It has turned to be an important international subject.
The Government of Japan is aiming to control emission in the year 2000 at the level of emission in 1990 (an equivalent to 320 million tons of carbon).
However, at this point in time, it is estimated that as much as 330 million tons will be in excess of the target. It is an avoidable target to reduce 10 million tons by the year 2000.

Among such increase emission from people's living is remarkably rising:
The result of 1990 : 72 millions tons (22.5% of the total)
Estimated 2000 : 93 million tons (28.1% of the total)

As a strong measure, to use insulation glasses (heat isolation) for the openings of buildings and complex living buildings are widely discussed.
At this point in time, if the energy conservation for next generation is applied (if all the existing windowpanes of houses are replaced with insulation glasses), estimated reduction of CO2 emission is 2 million tons (from 6 million tons to 4 million tons), which represents a 20% of 10 million tons of advocated target of Government.

Comparison of Energy Saving Using a Model House (Simulated results)

Precondition

１	Area	Akita (area) Sendai (area) Tokyo (area) Osaka (area) Fukuoka (area)	Hokkaido(area)Double Insulated Glass. Excluded as it saturation level is more than 95%
２	Calculation software	Thermal load calculation program for houses	「SMASH」
３	A model house	a two(2) storied wooden house Total floor space. Size of opening.	121.7 Square Meter 29.7 Square Meter
４	Kind of glass.	Unification of kind of glass for all windows.
５	Air-conditioning temperature range	Air-condition in the summer Heating in the winter	26 degree C 20 degree C
６	Operating condition	Intermittent operation for living, dining and five(5) other rooms.	Windows are closed while in intermittent operation.
７	Period of air-conditioning.	Period of heating.	Period of air-conditioning.
８	Akita (area) Sendai (area) Tokyo (area) Osaka (area) Fukuoka (area)	10/06〜5/23 10/11〜5/16 11/02〜4/22 11/04〜4/17 11/03〜4/20	7/14〜9/07 7/18〜9/03 6/22〜9/19 6/02〜9/26 11/03〜4/20

Item Spec. Period of heating Period of air-conditioning Total Period Unit 3mm Float 3mm Single 8,573 81,872 1,027 9,685 9,600 91,557 Mcal (Yen) Insulation Glass 3mm+3mm 6,527 62,332 1,062 10,014 7,589 72,346 Mcal (Yen) High performance insulated glass 3mm+Low-E3mm 5,906 56,402 1,105 10,420 7,011 66,822 Mcal (Yen) High Performance Heat reflect insulated glass 3mm+Heat reflect coat+3mmLow-E 6,807 65,008 873 8,233 7,680 73,241 Mcal (Yen)

Item Spec. Period of heating Period of air-conditioning Total Period Unit 3mm Float 3mm Single 6,458 61,674 933 8,798 7,391 70,472 Mcal (Yen) Insulation Glass 3mm+3mm 4,705 44,933 1,036 9,769 5,741 54,702 Mcal (Yen) High performance insulated glass 3mm+Low-E3mm 4,185 39,968 1,046 9,863 5,231 49,831 Mcal (Yen) High Performance Heat reflect insulated glass 3mm+Heat reflect coat+3mmLow-E 5,350 51,093 561 5,288 5,911 56,3811 Mcal (Yen)

Item Spec. Period of heating Period of air-conditioning Total Period Unit 3mm Float 3mm Single 4,262 40,702 2,546 24,008 6,808 64,710 Mcal (Yen) Insulation Glass 3mm+3mm 3,102 29,624 2,523 23,492 5,625 53,116 Mcal (Yen) High performance insulated glass 3mm+Low-E3mm 2,767 26,424 2,518 23,744 5,285 50,168 Mcal (Yen) High Performance Heat reflect insulated glass 3mm+Heat reflect coat+3mmLow-E 3,610 34,475 1,789 16,870 5,399 51,345 Mcal (Yen)

Item Spec. Period of heating Period of air-conditioning Total Period Unit 3mm Float 3mm Single 4,594 43,873 3,290 31,024 7,884 74,897 Mcal (Yen) Insulation Glass 3mm+3mm 3,440 32,852 3,399 32,053 6,839 64,905 Mcal (Yen) High performance insulated glass 3mm+Low-E3mm 3,096 29,557 3,376 31,835 6,472 61,392 Mcal (Yen) High Performance Heat reflect insulated glass 3mm+Heat reflect coat+3mmLow-E 3,647 34,829 2,740 25,838 6,387 60,667 Mcal (Yen)

Item Spec. Period of heating Period of air-conditioning Total Period Unit 3mm Float 3mm Single 4,124 39,384 3,304 31,157 7,428 70,541 Mcal (Yen) Insulation Glass 3mm+3mm 3,067 29,290 3,298 31,100 6,365 60,390 Mcal (Yen) High performance insulated glass 3mm+Low-E3mm 2,754 26,301 3,267 30,808 6,021 57,109 Mcal (Yen) High Performance Heat reflect insulated glass 3mm+Heat reflect coat+3mmLow-E 3,274 31,267 2,700 25,461 5,974 56,728 Mcal (Yen)

Main