duct losses

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WCEC tested variable capacity compressor and variable speed blower technologies and evaluated duct losses for single zone and multi-zone residences.

Estimates of degradation in EER of 10% to 55% (Mowris 2016) included: 3 to 12% for low air flow, 4 to 7% for evaporator blockage, 7 to 36% for duct losses and 4 to 56% for refrigerant mischarging.

Next-Generation Residential Space Conditioning System for California

Duct losses were included in these simulations to account for typical system conduction losses when supply air ducts are located in unconditioned spaces.

Duct losses can be eliminated or reduced when VRF systems are specified.

Computer Modeling VRF Heat Pumps in Commercial Buildings using EnergyPlus

Multizone systems do not have the high static duct losses seen in high pressure systems.

Retrocommissioning older buildings

Good sources say that duct losses are typically high--15 percent to 30 percent on average of your heated air from the furnace is lost through cracks and openings at the duct joints.

8 easy projects for instant energy savings: with these inexpensive ideas you can reduce your carbon footprint and slash your energy bills. Spend $400 once to save $900 a year!

* Exhaust duct losses: 2.0 kPa (0.02 bar), assuming heat recovery

Improving utilization of energy at the power generation plant by recovering heat energy for the production of cooling power--a sustainable design approach

The power used to compute EER does not include the fan power required to overcome duct losses or high performance filters.

Dual-capacity heat pumps

The VRF essentially eliminates duct losses, which are often estimated to be between 10% to 20% of total airflow in a ducted system.

The more subtle energy efficiency advantages of VRF systems, such as the reduction in duct losses, the ease of electrical submetering, and even the higher part load efficiency, frequently are overlooked.

Variable refrigerant flow systems

Further, SEEM closely tracks duct losses to user specified zones (inside, outside, crawl, attic) and accurately models their impacts.

Moving ducts into conditioned space: getting to code in the Pacific Northwest

The temperature differences between the house and the crawl space and between the house and the belly space both increased postretrofit, reflecting fewer duct losses to the spaces.

Thermal characterization and duct losses of belly spaces in manufactured homes

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