Archive for the ‘Air Conditioning Installation’ Category

Why Orange County Residents Should Get a Energy Audit Before Installing a New Heating Upgrade

Wednesday, March 21st, 2012

Yesterday was the first day of spring, so if you can’t feel it already, warmer temperatures are on their way to Orange County.  When you envision the warm days of summer, do you picture staying cool with an energy efficient cooling system, without any worries about high energy costs?  Or are you concerned that your older air conditioning unit won’t make it through another hot summer?  Well right now is the perfect time for an air conditioning installation, not only because Saddleback Plumbing can save you money on your purchase, but because there have been so many upgrades to the technologies of cooling systems.

Before you take the plunge on new equipment, though, you may want to get a home energy audit. What you find may help you choose the right system.

A home energy audit is essentially an inspection by a professional of the materials used to insulate your home. This includes not just the insulation in the walls, but also the walls themselves, along with windows, doors and so on. The idea is to figure out how much heat is escaping your home to the outside, so an audit may also include looking at ducts, vents or anywhere else where air could flow through.

So what does an energy audit have to do with a heating upgrade?

Think about it like this. There are two ways to make your home warmer: increase heat gain (e.g., get a more efficient heating system) or decrease heat loss. If you are able to do the latter, you may find that the former is unnecessary.

For example, you may get an energy audit and discover that by installing new windows and resealing your doors, you can increase heating efficiency by 10%. This could have big implications for your decision to get a new heating system, as you may decide that you can save money by getting a smaller capacity furnace. Getting the right size furnace is very important; one that is too small will not be able to heat your home to the desired temperature and one that is too large will short-cycle, which leads to uneven heating and wears down your system quickly.

A home energy audit is the first step to getting a new heating system, and one that is sure to save you money. Give Saddleback Plumbing a call to set up an energy audit today!

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How to Calculate Duct Size for an AC System in a Los Alamitos Home

Wednesday, February 22nd, 2012

Duct sizing in Los Alamitos is a complex process using one of three methodologies. The goal of duct sizing is to provide the perfect space through which heated and cooled air can travel around your home. Ducts should provide ample air flow to keep you comfortable without overworking your HVAC system or costing you an arm and a leg on your energy bill.

Methods Used for Sizing

There are three methods used for most modern duct sizing. The first is the Velocity Method. The velocity method takes into account the speed at which air flows through the ducts based on their general size. A series of equations is used to determine this, including duct cross sectional area, air flow rate and air speed. A much more detailed breakdown is available on the EngineeringToolbox.com for those interested in the math behind the process.

In general though, the velocity method allows contractors to determine the appropriate size and layout of ducts based on their application (residential, commercial, industrial or high speed) and their position (main or branch ducts).

Contractors may also use the Constant Pressure Loss and Static Pressure Recovery methods to design ductwork for your air conditioning installation. The constant pressure loss method tends to result in more components but provides a more accurate reading of the actual pressure loss in the system based on the materials used and the layout of your ductwork.

Static pressure recovery focuses on ensuring the same pressure level is achieved at all vents and inlets for the system. It is probably the most complicated sizing method, however, so it is rarely used for air condition system installations.

Simplifying the Process

Were we to break down the process into its core components, this is what a contractor would do when sizing your duct work:

  • Determine CFM for Each Room – using the Manual J for load calculations, they would determine the CFM. This is based on the (Room Load/House Load) x Equipment CFM. The entire house must be measured and load calculations completed before this can be done.
  • Friction Loss Rate – Friction loss rate is the (Available Static Pressure x100 / Effective Length).
  • Duct Sizing – Finally, the contractor will use a chart or software to select ductwork based on the friction loss and CFM calculated in the first two steps.

The goal of all of this math is to ensure that the HVAC system installation is exactly as large as is necessary to distribute heated or cooled air to the entire house. Incorrect measurements result in improper delivery of that air and a system that doesn’t quite get the job done.  If you have any questions about this process please contact Saddleback Plumbing.

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