Thermal management also needs to be included while designing devices and the issue is likely to become more complex over the years. Reduction of power is also related to power aware computing, which is designing software and hardware to ensure optimum management of power.
The growth of information technology has spawned a vast industry based around computers and information science. The impetus to economies and employment provided by computing ignores the silent yet alarming environmental hazard posed by systems compressed in small spaces requiring enormous amounts of power and generating large quantities of heat. Heat generated by computers is easily calculable, but one seldom takes into account the heat of hundreds of humans working in small spaces. There is increased awareness of environmental hazards of power and heat in computing, which are being addressed by the industry and academicians. The main issues to be considered are the nature and magnitude of the threat and measures that can be taken to minimize or overcome these. This is being carried out by a study of two prominent trends in computing environment, heat density and power aware computing.
In this section we wil...
A White Paper, "Heat Density Trends in data Processing, Computer Systems and Telecommunications Equipment" is the main source of the study. (Uptime Institute: 2000). A number of other papers and presentations have also been considered to validate the trends in the Uptime Institute paper.
There is a general feeling of smugness in the computing world generated by the optimistic growth prediction of Moore's Law with semi conductor performance doubling every eighteen months. This has resulted in technology compaction, yet what has not been fully appreciated is that energy efficiency in computing equipment has not been correspondingly achieved. The vertical racking of servers to reduce floor space has resulted in heat dissipation of a magnitude of 10kW or higher within 2 foot by 2.5-foot area. (Uptime Institute 2000: 1,2). This has caused environmental problems as corresponding provisioning of air conditioning to limit the flow of heat from hot surfaces to the human environment and the need for a 24/7 cycle in the computer industry has created many unknown and little appreciated hazards today. This has received some attention in the industry as a collaborative effort within, to include major players as Amdahl, Cisco, Compaq and others to understand the trends is underway. (Uptime Institute 2000 : 2).
The trends reveal that the annual rate of increase in power density over the decade from 1992 to 2002 in the case of servers, DASD and workstations would be to the tune of 15 %, while in the year 2000 to 2001 itself the increase has been 100 watts/ft2. The study also reveals that while sufficient power can be provided, there may be a need to provide water cooling or other methods to remove the heat from computers as the present air-cooled method