What Are the Benefits of Half Round Ducts?

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There are several factors that one should consider when planning ductwork. It includes installation, fabrication, acoustics, economics, and performance. In this article, we will explain why round or spiral ducts are more energy-efficient than rectangular ones.

Based on the noise criteria, the American society of refrigeration, cooling, and air-conditioning developed a set of rules for maximum velocities in a duct system.

Why should you use a half round duct?

High velocities promote a better duct design using static regain. Static regions result in a balanced system and low operating expenses. Systems get primarily sized or designed using round dimensions. Rectangular ducts get used in places where there is a space constraint. For flat oval ducts, the round one gets converted to rectangular shapes. It keeps the velocity the same as the half round duct. It gets done using a spreadsheet, smartphone app, or a calculator for accurate measurement.

Rectangular ducts use a higher velocity that produces noise problems and pressure loss. An oval-shaped or vent hole has less momentum. It gets rid of pressure loss. Oval or round ducts get converted to rectangular shapes using two processes. One uses velocity. Another follows the pressure drop for the conversion.

How does static pressure increases the aspect ratio?

Rectangular ducts with an aspect ratio of 1:10 have the maximum energy efficiency. A 1:10 aspect ratio has a 19% static pressure. When the aspect ratio increases to 3:1, the static pressure enhances by 46%.

It is one of the reasons why plumbers use a half round duct. A flat oval with a 1:1 aspect ratio equals a round duct. It has a lower pressure loss than a rectangular with the same velocity as a round one.

It means that an oval-shaped duct has the same pressure loss as a round one.

How does the perimeter of a rectangular duct increase the aspect ratio?

Velocity gets reduced to produce equivalent pressure drop. It means that the cross-sectional area of the rectangular duct increases. It further enhances the perimeter. If the aspect ratio is 1:1, the perimeter increases by 15%. If it is 3:1, the perimeter gets increased by 33%.

It increases the perimeter of a rectangular duct compared to a half round duct. While round or oval-shaped ducts are available at a height of 11 feet, rectangular ones don't extend beyond 5 or 6 feet. Hence, it needs more joints and installation.

It makes rectangular ducts heavy and reinforced. A round or oval-shaped duct will be more energy-efficient. Regardless of the dimension, the designer uses pressure fittings.

A rectangular vent hole has a huge leakage effect. When the system has leakage, the operating pressure gets reduced. One of the benefits of using an oval-shaped duct is that it gets fabricated at higher lengths. It's one of the reasons that a round flue has fewer joints than a rectangular duct.

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