335 results about "Heat rejection" patented technology

A heat transfer system is presented for managing thermal transients, thus providing engineers greater flexibility in designing thermal solutions for applications subject to transient heat-generation. A heat reservoir device for managing a heat input subject to transient conditions includes a heat transfer subsystem having a first end and a second end, where the first end is thermally coupled to the heat input; a heat storage subsystem coupled to the second end of the heat transfer subsystem, where the heat storage subsystem comprises a phase change material responsive to the transient conditions. The excess heat load during transient operation is temporarily absorbed by the latent heat of fusion when the phase change material changes its phase from solid to liquid. Subsequently, the absorbed heat can be released back to the ambient via a heat rejection subsystem. This allows engineers to design smaller heat sinks capable of accommodating given transient conditions. This results in heat sinks which are lower cost and smaller size, or which reduce the requirement to provide higher airflow, thereby also decreasing cost and noise, and increasing reliability.

A vehicle cooling system for a mobile vehicle consists of three essential parts. These are a compressed air reservoir, a heat exchanger and a duct connecting the reservoir and the heat exchanger. On demand, the compressed air will be released to the duct and will expand (as the end connected to the reservoir is expected to be lower in cross-sectional area compared to the end connected to the face of the heat exchanger). This expansion will lead to the reduction in air temperature. This helps in increasing the heat rejection capacity of the cooling system. The colder air passes through the heat exchanger and carries away the heat. This air exits from the other end of the heat exchanger into the environment. A fan is optional to operate behind the heat exchanger to help draw the air though it. The compressed air may originate in the vehicle air system for operating air brakes found on medium and heavy-duty trucks or the compressed air may originate from a separate air compressor. The system may be located in various locations on the vehicle due to the lack of reliance on ram air caused from vehicle movement.

A controller identifies a condition of a hazardous internal short by comparing patterns of series element voltages to the last known balance condition of the series elements. If the loaded or resting voltage of one or more contiguous series elements uniformly drop from the previously known condition by an amount consistent with an over-current condition, an over-current internal short circuit fault is registered. The desired response is to prevent the affected series elements from heating to a hazardous temperature by summoning the maximum heat rejection capability of the system until the short ceases and the affected elements cool, the cooling function is no longer able to operate due to low voltage, or the affected series string has drained all of its energy through the short. Also includes are responses that allow the battery pack to continue to power the cooling system even though it may enter an over-discharged state.

Systems and methods for operating a thermodynamic engine are disclosed. The systems and methods may effect cyclic motion of a working fluid between hot and cold regions of a thermodynamic engine and inject a dispersible material into the working fluid at the hot or cold region during a heat-addition or heat-rejection process. The system and methods may also evacuate the dispersible material from the hot or cold region.