TideLoad 10v1

ASHRAE Standard 62.1-2004

Eight Zones with condensed CLTD/CLF/SCL tables. Includes traditional sensible load calculations plus new latent loads, heat recovery unit adjustments, and duct loss/gain options. New Worksheet for computing ASHRAE Standard 62.1-2004 ventilation air requirements.

Excel Program is unlocked so user can add more zones and expand capabilities if adventuresome.

Calculation

The calculation of the cooling and heating loads on a building or zone is the most important step in determining the size and type of cooling and heating equipment required to maintain comfortable indoor air conditions. Building heat and moisture transfer mechanisms are complex and as unpredictable as the weather and human behavior, both of which strongly influence load calculation results.

Some of the factors that influence results are:

• Conduction/convection of heat through walls, roofs, floors, doors and windows.
• Radiation through windows and heating effects on wall and roof surface temperatures
• Thermal properties of buildings (Insulation, glass transmittance, surface absorbtivity)
• Building thermal mass and corresponding delay of indoor temperature change
• Construction quality in preventing air, heat, and moisture leakage
• Heat added/lost with ventilation air needed to maintain air quality (code compliance)
• Heat generated by lights, people, appliances, and equipment
• Heat added/lost by air, water, and refrigeration distribution systems
• Heat generated by air and water distribution equipment
• Moisture added/lost with ventilation air to maintain air quality and code compliance
• Moisture movement through building envelope
• Moisture generated by occupants and equipment
• Activity level, occupancy patterns, and make- up (male, female, child) of people
• Acceptable comfort and air quality levels of occupants
• Weather conditions (temperature, moisture, wind speed, latitude, elevation,
• solar radiation, etc.)

These many factors combine to force engineers to develop procedures that minimize the load calculation complexity without compromising accuracy. A combination of measured data and detailed simulations have generated techniques that can be done with a pocket calculator and a one-page form or more complex numerical simulations that take hours to complete using modern computers.

However, many assumptions and simplifications must be made for all methods.