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As our electronics and other systems have become more and more demanding of power in relatively smaller and smaller spaces, fans have had to step up and draw upon all of their power in order to pull heat away from areas where it can build up. In home construction, forced air heating is often used to help keep the indoor temperature stable, but the power needed for the fan watt draw goes up accordingly as the fan's performance does.
More and more, with an eye on minimizing power consumption and increasing energy efficiency, fan load has become one of the areas of concentration. HERS-rated technicians must not only know how to check for air tightness in duct work or by using a door blower test, but must also be aware of fan efficiency and how it affects airflow and noise.
Fan manufacturers measure efficiency of their hardware using total pressure, while static efficiency is calculated by using static pressure. As air moves through a system, it creates positive static pressure. Any other components that inhibit the movement of the air flow create negative static pressure. Different types of fans therefore create different values of airflow in order to balance the negative and the positive.
The California Energy Commission has proposed a new change in their codes and standards that affects single family and multi-family buildings. This proposal reduces fan unit efficiency from 0.58 watts per cubic feet per minute to 0.45 W/cfm In addition, it also allows for a compliance option for fault detection and diagnosis devices, This compliance credit for FDD devices will be designed to support long term and initial performance of cooling systems.
An alternative option would be to verify fan efficiency via temperature split. This alternative to refrigerant charge verification can still measure the performance of the system while detecting multiple system faults while needing less time to verify them.
If you're concerned that your fan installation is drawing too much wattage or you need to check for compliance, contact Poppy Energy. Our certified HERS-rated technicians can perform a variety of tests to measure the efficiency and output of your fan and HVAC system. We can also conduct duct airflow testing, door blower tests, and other testing and verification needed to obtain Title 24 compliance in order to secure a building permit or for other regulation needs.
Contact us today to learn more and to schedule a consultation.
*If purchasing QII & Duct Testing together.
Offer expires August 7th
If you'd like to learn more about the other HERS energy solutions we perform or would like to schedule an appointment for a fan efficacy test, we're happy to do so! Contact us today!
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