The advantage of this feature in Rhvac is that you do not have to reenter the data over again for any Rhvac project that you wish to use in one of the above energy programs. Many states have code laws that technically cover the entire state, but are often not enforced in certain areas of the state simply due to lack of resources.
Some contractors take advantage of this lack of enforcement and disregard various code points as they believe there are no potential repercussions from doing so. While it is true that no immediate penalties are likely to occur in a low enforcement area, it is quite possible that some future problem with the building will arise that causes the owner to investigate details of the installation.
If the investigation, even done years later, determines that various points of the governing state code were flagrantly ignored at the time of the installation, a Mechanical Integrity violation could be invoked causing significant fines and penalties.
The Mechanical Integrity concept is a general requirement that a contractor follow all applicable standards in the performance of his work relating to equipment, piping, instrumentation, electrical systems, and other physical items. Contractors who ignore their state's own implementation of the IRC and IECC codes, no matter how laxly enforced, run the risk of a future Mechanical Integrity violation.
As mentioned above, both versions of Rhvac provide nice built-in equipment selection capabilities. But if you need to compare one specific model or a type of model against another and perform an economic analysis of operating costs, then the Energy Audit program is what you need.
It can import all necessary data from both versions of Rhvac or be used stand alone. By calculating pay back and return on investment, Energy Audit is perfect for showing your customers why high efficiency equipment is worth paying more for. See more details on Energy Audit here. Ground source heat pumps and direct exchange heat pumps that use geothermal energy are the most efficient HVAC units on the market today.
The U. Rhvac calculates perfectly for all types of geothermal equipment. What is different about ground source heat pumps is that a 'loop' design also needs to be performed. A loop is usually polyethylene tubing that is buried in the ground or submerged in a pond.
This loop connects the heat pump to the ground or water. The length of tubing required in the loop is a special calculation. Elite Software offers a program called ECA Earth Coupled Analysis for the calculation of ground loops in horizontal, vertical, and 'slinky' configurations.
ECA can import all necessary data from Rhvac or be used stand alone. See more details on ECA here. Direct exchange heat pumps use copper tubing to connect the heat pump to the ground.
Each manufacturer provides its own chart for sizing copper loops and thus loop sizing software is not required. Both ground source and direct exchange heat pumps are more expensive than standard air source heat pumps. A program such as Elite's Energy Audit is a great aid in showing customers the operating cost savings of all types of geothermal heat pumps.
These new roof and wall selections make it easy to do load calculations for the increasing number of houses being built with these technologies. In addition, many more window selections are included with both versions of Rhvac beyond what is in the standard Manual J book. The program will then automatically assign the CFM values to each duct based on the load calculation results, calculate all the sizes, redraw all the ducts at their proper width or diameter, and calculate all the pressure losses.
Watch the video demo to see this new program in action. It automatically creates runout ducts in each room of your floor plan and assigns them the proper airflows as calculated by Rhvac. Reports show the static pressure loss of each individual duct as well as the cumulative loss at each point in the system.
The equal friction sizing method is used to determine optimum duct sizes to the nearest inch or centimeter. You can also select to size ducts based on a user-defined schedule of sizes, or exact nearest tenth of an inch, or millimeter.
Or you can select Presize for the sizing method and enter your own diameter or height and width for the duct. Static pressure losses resulting from fittings and dampers are based on Manual D's equivalent length definitions, with the several hundred fitting definitions from Manual D built in to the program, including pictures.
Inputting data consists of drawing duct objects and setting their properties in the Object Properties window of Drawing Board, as well as with popup dialogs. The reports are integrated with those of Rhvac, so to see a report of the results just check the checbboxes in the 'Graphic Manual D Ductsize' frame on Rhvac's Select Reports dialog. New reports will then be included in the Print Preview window's list of reports. One reports will show you detailed information for each duct followed by a duct system summary that lists key data about the duct system such as the runout with the highest pressure loss and the duct with the largest calculated diameter.
The Pressure Changes Graph report will show you the static and total pressure available at each point along the route with the highest static pressure loss. Load Calculations and Duct Sizing- Easy and Powerful Rhvac makes HVAC load calculations, duct sizing, equipment selection, and sales proposals as easy as they can be - with one-click help on virtually every input, favorite material lists, automatic error checking and more. Rhvac is approved by ACCA. Lets you enter the entire duct system, or individual ducts if you prefer.
Performs full Manual S performance data interpolation on data from any manufacturer. Determines building tonnage and room CFM requirements. Exports to EnergyPro, powerful energy analysis software. Desktop Only Includes a Buiding Rotation Duct Size Preview window that shows you the heating and cooling CFM for each room or duct in the project for each rotation of the building, as well as the maximum duct size of all rotations.
Find a Contractor ». Skip main navigation Press Enter. Toggle navigation. Search Options. Technical Manuals. ACCA is the source of technical expertise in the indoor environment industry. Our technical manuals cover the complete gamut of design, installation and maintenance for residential and light commercial HVAC systems.
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Comments Have your say about what you just read! Leave us a comment in the box below. Sugarman HVAC. Download PDF. Have your air conditioner and furnace checked out before each heating and cooling season to catch problems before it is too late. Change filters regularly. A dirty filter can severely lower your HVAC system's performance. I understand these calls may be generated using automated technology and my consent does not imply or require that a purchase be made.
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