Heating and Cooling Load Calculations
WrightSoft Residential HVAC Software
What We Do:
· Savoy Engineering Group provides accurate, up-to-date, Residential Heating and Cooling Load Analysis services for single-family, multi-family, apartments, condominiums, townhouses and modular homes.
· Savoy Engineering Group utilizes WrightSoft Universal 7.0 HVAC Residential Load Calculation Software. WrightSoft Universal provides the most accurate load calculations and equipment sizing with Right-J® for ACCA Manual J8 load calculations.
· Savoy Engineering Group performs a ROOM x ROOM residential heating and cooling load analysis using up-to-date procedures recognized as industry standard based on ACCA Manual J 7th or 8th Edition and HRAI F280 (Canada)
The heating and cooling load estimates affect every aspect
of the system design procedure
- From system selection
- To placement and selection of air distribution hardware
- To duct routing and airway sizing or pipe layout and sizing
- Eliminate Under-sizing of Heating & Cooling Equipment
- Eliminate Over-sizing of Heating & Cooling Equipment
- Humidity Control During the Cooling Season
- Eliminate Comfort Problems
Your residential load calculation MUST be as accurate as possible
If your residential load analysis is inaccurate:
Under Sizing Equipment
- Will not maintain desired temperature
- Slightly under sized equipment (by a margin of 10% or less) may actually provide more comfort at a lower cost.
Over Sizing Equipment
- Short-cycles
- Marginalized temperature control
- Pockets of stagnate air
- Degrades humidity control during the cooling season
- Requires larger duct runs
- Increased installation costs
- Increased operating costs
- Increases demand on utilities
- Adds unnecessary stress on equipment
What else a Load Analysis is used for: If the residential HVAC system is the backbone of the house as a system, then the HVAC Load Calculation is the backbone of the HVAC system 
The History of Manul J and Load Analysis Software:
In 1986, the Air Conditioning Contractors of America (ACCA) released their Manual J residential load calculation method in the traditional paper booklet format. In that same year, they also tried something different, an entirely new approach to calculating residential loads - a computer software version of the Manual J method, called Right-J®.
Right-J broke new ground in calculating residential loads by dramatically shortening the design time, and soon became the industry standard. ACCA's partner in this venture was Wrightsoft Corporation (formerly Wright Associates), the developers of the Right-J program. The partnership between these organizations has continued to grow, and has resulted in a complete family of HVAC system design software.
The partnership between ACCA and Wrightsoft began in 1985, when ACCA selected Bill Wright to develop computer versions of their manual methods. In the mid-80's, electrical engineer Bill Wright was an energy conservation consultant to major corporations and was also conducting a graduate HVAC seminar at the Massachusetts Institute of Technology (MIT). Meeting with HVAC contractors regularly, Bill realized the need for software that could easily be integrated into the daily operations of HVAC designers. With ACCA in mind, Bill designed his residential load program, Right-J, to exactly replicate the industry standard, Manual J.
Why Use Manul J
The Air Conditioning Contractors of America (ACCA) guidelines for sizing HVAC equipment, ACCA Manual J Residential Load Calculation, enables contractors to estimate heating and air conditioning loads more accurately. Using Manual J, an engineer calculates heat loss from the building through walls and ceilings, leaky ductwork, and infiltration through windows, doors, and other penetrations as well as heat gain into the building from sunlight, people, lights and appliances, doors, walls, and windows, and infiltration though wall penetrations. Design conditions for the area are also used as inputs into load calculations.
