![]() They can be fairly accurate, but they can also seriously underestimate or overestimate the temporary cooling requirements. Rules of thumb are best used in emergency situations when a unit has failed and the facility needs a temporary unit immediately. ![]() ![]() These numbers are for a typical application, and managers will have to consider such factors as climate, the amount of glass in exterior walls, the lighting system, the kind of heat-producing equipment present in the space, and space occupancy. Retail areas are in the range of 250-400 square feet per ton. For data centers, the cooling load is 150-300 square feet per ton of cooling. The most common rules of thumb for temporary cooling are based on the area of the space served.įor example, one commonly used rule of thumb for general office areas is that the cooling load is 200-300 square feet of floor area per ton of cooling. Managers use them because they are quick and easy. ![]() ![]() Sometimes they are successful and fairly accurate, but sometimes they are not. Rules of thumb have be used for decades when sizing HVAC systems. Managers can choose from three methods to determine the appropriate size of the temporary unit to meet the facility’s cooling load: rule of thumb, ton-for-ton replacement, and heat-load calculations. ![]()
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