NOVELTY - The power-efficient data center comprises a resource item (102), which includes an air-intake portion (122), an air-output portion (124) and a group of data processing modules (104) comprising minimal components to perform core functions of the data processing modules, and an air moving system, which is configured to receive ambient unconditioned air external to the resource item and supply the ambient unconditioned air to the resource item, and includes a venting system that is configured to redirect heated air expelled from the air-output portion to the air-intake portion.    USE - The power-efficient data center is useful for providing network-accessible services to electronic devices such as personal computers, personal digital assistants and mobile telephones.    ADVANTAGE - The power-efficient data center can operate in an uncontrolled environment with reduced safe guards against failure, and has compact structure and reduced construction cost by omitting an individual local fan, a chassis structure, a power conditioning mechanism, diagnostic functionality, or service-related functionality for accommodating the servicing of components on the data processing module.    DETAILED DESCRIPTION - The power-efficient data center comprises a resource item (102), which includes an air-intake portion (122), an air-output portion (124) and a group of data processing modules (104) comprising minimal components to perform core functions of the data processing modules, and an air moving system, which is configured to receive ambient unconditioned air external to the resource item and supply the ambient unconditioned air to the resource item, and includes a venting system that is configured to redirect heated air expelled from the air-output portion to the air-intake portion, so that the heated air mixes with the ambient unconditioned air at the air-intake portion. The air moving system includes a central fan that moves the ambient unconditioned air across plural members of the group of data processing modules. The venting system includes a valve for redirecting the heated air expelled from the air-output portion of the resource item to the air-intake portion of the resource item, and a valve for controlling an amount of the ambient unconditioned air that is delivered to the resource item. The power supplied to the power-efficient data center is used by the resource item. The resource item includes: a first arrangement of resource items and a second arrangement of resource items, where a gap separates the first arrangement of resource items from the second arrangement of resource items. The air-intake portion of the first arrangement of resource items receives the ambient air external to the power-efficient data center and passes the ambient air in an unconditioned state to the resource items of the first arrangement of resource items. The air-intake portion of the second arrangement receives the ambient air external to the power-efficient data center and passes the ambient air in an unconditioned state to the resource items of the second arrangement. The both arrangements of resource items direct heated air to the gap between the first arrangement of resource items and the second arrangement of resource items. The central fan is positioned over the gap between the first arrangement of resource items and the second arrangement of resource items. The resource item items form a data center unit. The data center comprises two data center units, which are arranged laterally with respect to each other in a layer of data center units or arranged vertically with respect to each other to provide two layers of data center units. The two data center units form a structure with an outer surface and a common chimney. The air moving system is configured to move the ambient air external to the power-efficient data center from the outer surface through the two data center units, and then into the common chimney. The common chimney includes a central fan for facilitating the removal of heated air from the common chimney. The resource item receives power from a turbine operated power source, a fuel cell power source, a photovoltaic power source, a nuclear-operated power source, a wind-operated power source or a wave-operated power source. An INDEPENDENT CLAIM is included for a method for operating a power-efficient data center.    DESCRIPTION OF DRAWING(S) - The diagram shows a perspective view of a power-efficient data center.    Resource item (102)    Group of data processing modules (104)    Data processing module (106)    Air-intake portion (122)    Air-output portion. (124)