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The effectiveness of the heat pipe system expressed in a percent is the ratio of the amount of heat transferred to the amount of heat available. The predicted effectiveness is calculated for a system based on the below design parameters. Several factors go into the effectiveness calculation and if these factors change the expected effectiveness can change. Construction variables such as difference in coil dimensions between supply and exhaust will affect the calculated effectiveness. Unequal airflows between the supply and the exhaust will also change the effectiveness. If there is more air through the supply end than the exhaust end, which is common with fresh air systems, then the temperature across the supply end, and the related effectiveness, will be lower than that across the exhaust end. More air flow on one side will reduce the effectiveness on that side by the ratio of the air flows. If BTUH for one side: BTUH=(1.05)(Δt)(CFM)  equals BTUH for the other side and no condensation is taking place, then the measurement variables can be considered accurate.