Hi All,
In my home we have a heat pump. The air coming out of the furnace is about 95-100F which is correct. By the time the air gets to the furthest vent of the house (bedroom above garage) the temperature can drop to 85F. And it's about 30F outside.
In our unfinished basement we have the furnace and the duct runs the entire length of the house with 2 turns. The main rectangular duct is about 50 feet long.There are various connections from this rectangular duct to 6" round ducts to each area.
I found the following web site that calculates heat loss in duct work www.wbdg.org/design/midg_design_tdcad.php
i entered the following data...
starting temp =100F
ambient temp = 70F
Flow rate=500CFM
Length=50 feet
Perimeter of duct = 48 inch
R value of insulation of duct =0
Result=89F
Simply by insulating the ductwork would be a great improvement…
Change R Value to=3 result=97F
R=6 result=98F
So it seems simply by insulating the ductwork within the living space will greatly improve the situation. Even just R3 will have a major impact.
What type of insulation would you recommend? Not too expensive as we have alot of ductwork. And also in Canada, weird as it sounds, choice might be limited.
Styrofoam boards?
Duct wrap?
Do you really think I will see an imporvement? Note the ductwork is inside the heated space. Although there is some in the garage.
Note some rectagular ducts, some round ones...
Thanks in advance,
terry
In my home we have a heat pump. The air coming out of the furnace is about 95-100F which is correct. By the time the air gets to the furthest vent of the house (bedroom above garage) the temperature can drop to 85F. And it's about 30F outside.
In our unfinished basement we have the furnace and the duct runs the entire length of the house with 2 turns. The main rectangular duct is about 50 feet long.There are various connections from this rectangular duct to 6" round ducts to each area.
I found the following web site that calculates heat loss in duct work www.wbdg.org/design/midg_design_tdcad.php
i entered the following data...
starting temp =100F
ambient temp = 70F
Flow rate=500CFM
Length=50 feet
Perimeter of duct = 48 inch
R value of insulation of duct =0
Result=89F
Simply by insulating the ductwork would be a great improvement…
Change R Value to=3 result=97F
R=6 result=98F
So it seems simply by insulating the ductwork within the living space will greatly improve the situation. Even just R3 will have a major impact.
What type of insulation would you recommend? Not too expensive as we have alot of ductwork. And also in Canada, weird as it sounds, choice might be limited.
Styrofoam boards?
Duct wrap?
Do you really think I will see an imporvement? Note the ductwork is inside the heated space. Although there is some in the garage.
Note some rectagular ducts, some round ones...
Thanks in advance,
terry