CAN CSA F280-M90 PDF

Voluntary, market-driven programs like EnergyStar, Built Green and R have provided builders with the technology and construction practices needed to build more comfortable, healthy and efficient homes. Today, we have building codes that require increased insulation values, mechanical efficiencies and air tightness. In many provinces, a new home built today delivers the energy performance of R homes built in the early s. One very direct consequence of these changes is that heating and cooling loads have dropped substantially in new homes across Canada. This can, and does, cause problems for builders.

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Voluntary, market-driven programs like EnergyStar, Built Green and R have provided builders with the technology and construction practices needed to build more comfortable, healthy and efficient homes.

Today, we have building codes that require increased insulation values, mechanical efficiencies and air tightness. In many provinces, a new home built today delivers the energy performance of R homes built in the early s. One very direct consequence of these changes is that heating and cooling loads have dropped substantially in new homes across Canada.

This can, and does, cause problems for builders. Somewhat like putting shoes on a child that are too big, oversized HVAC systems result in homes that run "sloppily" and inefficiently. During the cooling season, the problems change, but include poor thermal circulation and inadequate dehumidification. These problems can be avoided by the use of the new CSA F standard. It provides a tremendous opportunity for homebuilders and the HVAC industry to rationalize new mechanical system design.

Here is a brief synopsis of the more critical changes. The calculation method can now accept objective airtightness indicators such as blower door air tightness tests. This will be important in both new and existing homes where energy audits or specific air tightness targets have been verified by site testing.

The interaction between different types of ventilation systems and air leakage is accounted for. For example, a home with an exhaust-only ventilation system creates a slight negative pressure that changes the leakage patterns in a home and the new standard makes allowance for this. In the old Standard the total heat loss for the building was assigned to individual rooms as a function of the heat loss of that room.

In the new Standard, recognition of the stack effect warm air rising in a home will mean that the assignment of air leakage heat loss will be a function of the floor level of specific rooms. In other words, rooms on the first floor of a home will be assigned a greater portion of the air leakage component. The U factors and solar heat gain coefficients reported by window manufacturers in their CSA A compliant labeling can be directly put into the calculations now.

Finally, the new Standard will allow designers to take credit for the impact of heat recovery ventilation devices employed in a home. The new Standard will result in more accurate and potentially lower load calculations given the efficiency changes in new homes.

Smaller loads with traditional forced air systems require reduced fan capacity. The delivery systems i. The new Standard is formally recognized by the Ontario Building Code as of January 1, , and is expected to be referenced in the National Building Code of Canada in the near future. In the last two years, the new Standard has been applied on multiple Net Zero projects across Canada with great success.

Occupants of these Net Zero houses are raving about the "comfort" of their homes. Besides being quieter, and often smaller, "right sized" equipment delivers ambient temperatures which are nearly identical on every floor and in every room. The mechanical systems also operate at peak efficiency further reducing the cost of operation. The table illustrates the results of applying both the old and new standard to a reference home assumed to have an HRV air tightness of approximately 2.

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Here is a brief synopsis of the more critical changes. The table illustrates the results of applying both the old and new standard to a reference home assumed to fm9 an HRV air tightness of approximately 2. Standards Council of Canada The U factors and solar heat fm coefficients reported by window manufacturers in their CSA A compliant labeling can be directly put into the calculations now. This will be important ffm90 both new and existing homes where energy audits or specific air tightness targets have been verified css site testing. The new Standard is formally recognized by the Ontario Building Code as of January 1,and is expected to be referenced in the National Building Code of Canada in the near future. The interaction between different types of ventilation systems and air leakage is accounted for. The delivery systems i.

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