The Air Conditioning Contractors of America (ACCA) Manual J Residential Load Calculation Process is the acknowledged industry standard for the proper sizing and selection of HVAC equipment in residential functions.
Online PR News – 09-March-2013 – Heber City – keep readingManual J8 Residential Load Analysis, developed by Air Conditioning Contractors of America (ACCA,) is the recommended procedure to correctly calculate the necessary size of a HVAC system for a residential dwelling. By utilizing the Manual J Load Calculation you set yourself apart from your competitors by ensuring your customer will have the engineering standard in home heating and cooling performance, thus keeping their energy costs to a minimum.It is important that the hvac unit is sized appropriately. If the HVAC unit is too small, it will not heat or cool the home quickly enough, however, if the HVAC system is oversized, it will condition your house too rapidly without suitably dehumidifying the room. Time and again hvac contractors use "rules-of-thumb" to size HVAC system, without taking into consideration some important variables such as, the internal heat gain and loss, humidity, orientation of the home, ventilation and infiltration, resulting an incorrectly sized comfort system. Too small hvac equipment is continuously running and will never satisfy the required temperature. The undersized equipment will not last as long as a correctly sized hvac unit.It is more cost-effective to size HVAC system according to the typical ASHRAE winter or summer outside design temperatures, instead of preparing for the rare "worst-case-scenarios." Residential ACCA Manual J8 methods are not appropriate for high rise, commercial and industrial buildings, a room with an indoor hot tub or swimming pool, and houses that use passive solar methods. In any ACCA Compliant Manual J load analysis, the following items need to be addressed: Use the genuine orientation of the house. Solar heat gain depends on the orientation. Get the accurate building material R-values properly consider the infiltration load and required ventilation load following Manual J methods. Use design conditions recommended by ASHRAE or Manual J. In accordance to ACCA, the interior dry bulb temperature should be 70 F for winter and 75 F for summer. The inside relative humidity (RH) for cooling should be 50% for wet climates and 45% for dry climates. Take account of overhangs - "By including the overhang benefit in the analysis, the projected cooling load can be reduced to a ton on a 2400 ft2 home" (Addendum A to ACCA Manual J8). Include the people internal gain from a home, which is assumed to be the number of bedrooms plus one. Contractors and home owners can save large quantities of money on pricey errors when installing heating and cooling systems in a home by hiring a Competent HVAC Engineer such as Savoy Engineering Group to do the Manual J load analysis. There are numerous essential benefits to hiring an ACCA Certified Manual J Load specialist: HVAC design knowledge, ACCA certified software skill, turnaround time, and support service. WrightSoft Residential 12.0 software is one of the most renowned residential load analysis software programs for EnergyStar, building permit code compliance, LEED Certification, Build Green projects and energy efficient mortgages. Be sure your HVAC installer or Manual J Load Analysis provider is not using a low-priced, non-ACCA certified software to create your residential Manual J8 report or it could be rejected. The Air Conditioning Contractors of America (ACCA) Manual J Residential Load Analysis Method is the time-honored industry standard for the appropriate sizing and selection of HVAC equipment in residential functions. Manual J outlines the correct process which can be used to calculate the heat loss and heat gain for conventional residential structures. Make sure your Load Calculation Reports are based on ACCA's Manual J 8th Edition, inclusive of all four addenda to the 8th edition. To finish, huge price savings can be had in utilizing an ACCA Compliant Manual J8 Load Calculations supplier in every home you build by choosing the right sized HVAC equipment. An ACCA Certified Manual J Load Analysis supplier can help set you apart from your competitors by ensuring your client will have the engineering standard in home hvac efficiency, keeping their costs and yours to a minimum.