Advanced telecommunications air conditioning systems in the multimedia era

This paper describes a highly efficient and highly reliable air conditioning system suitable for use in telecommunications and information processing equipment rooms, a power supply system for this air conditioning system, and an air conditioning system for improving office amenity. The air conditioning system for telecommunications and information processing equipment rooms can be used in rooms with a high heat density (a mean density of 1 kW/m/sup 2/) for natural-convection cooled equipment. A new control method enables the air conditioner to operate economically when the outdoor air temperatures are low. The inverter back-up system is shown to be the most suitable power source for a highly reliable air conditioning system. The air conditioning system for offices with multimedia equipment uses a raised floor to provide a supply and return air space and wiring space. The air flows, very slowly, from floor to ceiling in winter and from ceiling to floor in summer, thus keeping office workers comfortable.< >