The document discusses various factors that affect the life of equipment and cooling requirements for buildings. It outlines solar, occupant, appliance, and ventilation heat loads. It also discusses transmission and residual heat loads. It then describes different air cooling systems like evaporative coolers, refrigerated air cooling systems, and types of refrigeration cycles like direct expansion and chilled water systems.

9. AIR COOLING SYSTEM Evaporative cooler very common system used in hospitality operations very economical total cooling energy required generally much less also filters air only work in dry climates be careful of harmful humidity works in kitchen

10. REFRIGERATED-AIR COOLING SYSTEM Ensures : cool and dehumidified air will be available throughout the cooling season Air moisture : condenses from air when it strikes a cold surface releases its talent heat of evaporation Moist air has a high dew point : the cold condensing surface (evaporator) must be below the dew-point temperature dehumidifies the air Depending on : Vapor compression & absorption cooling

11. TYPES DIRECT EXPANSION: cools ventilation air directly at the evaporatior can be used for most cooling requirements CHILLED WATER: common for medium or larger sized buildings uses basic water vapor system used to produce chilled water.

12. BASIC REFRIGERATION CYCLE