A plate heat exchanger includes heat exchanger plates positioned between two end plates, a plurality of threaded tightening bolts each extending between one of the end plates and a drive unit, and through the other end plate, and a plurality of motors collectively defining the drive unit. The threaded tightening bolts each include a bolt head that bears directly/indirectly against the first or second end plate. A nut is in threaded engagement with each threaded tightening bolt and bears directly or indirectly against the second or first end plate so that the bolt head/nut associated with each threaded tightening bolt bear directly or indirectly against different ones of the first and second end plates. Each of the motors is operatively connected to a respective one of the threaded tightening bolts so that each of the threaded tightening bolts is rotatable independently of others of the threaded tightening bolts.

The present disclosure describes a heat exchanger of a motor vehicle that is supplied with a cooling air mass flow that changes depending on a travelling speed of the motor vehicle. The heat exchanger includes a heat exchanger block with a plurality of flat tubes that are each received on a longitudinal end side in an associated passage opening of a tube sheet and provide a coolant path. A tank is connected to the tube sheet and defines a coolant header. An additional element is arranged on an outer edge or on an outer marginal region of the tube sheet. The additional element is structured and arranged to provide an at least partial covering of the tube sheet relative to an inflow side, e.g., relative to the cooling air mass flow.

A system for designing a circuitry configuration of heat-exchanger units includes an interface to acquire design parameters the heat-exchanger units, a memory to store computer-executable programs including a relaxed decision diagram formation module, and a processor, in connection with the memory, configured to perform the computer-executable programs. The computer-executable programs include steps of providing a configuration of the heat-exchanger units, providing the design parameters of the heat-exchanger units acquired via the interface, generating a relaxed decision diagram based on the design parameters, creating constraints with respect to connections of the heat-exchanger units according to the relaxed decision diagram, and generating feasible configurations of the heat-exchanger units by a mixed-integer-programing method using the constraints.

A system for designing a circuitry configuration of heat-exchanger units includes an interface to acquire design parameters the heat-exchanger units, a memory to store computer-executable programs including a relaxed decision diagram formation module, and a processor, in connection with the memory, configured to perform the computer-executable programs. The computer-executable programs include steps of providing a configuration of the heat-exchanger units, providing the design parameters of the heat-exchanger units acquired via the interface, generating a relaxed decision diagram based on the design parameters, creating constraints with respect to connections of the heat-exchanger units according to the relaxed decision diagram, and generating feasible configurations of the heat-exchanger units by a mixed-integer-programing method using the constraints.

A plate heat exchanger includes heat exchanger plates positioned between two end plates, a plurality of threaded tightening bolts each extending between one of the end plates and a drive unit, and through the other end plate, and a plurality of motors collectively defining the drive unit. The threaded tightening bolts each include a bolt head that bears directly/indirectly against the first or second end plate. A nut is in threaded engagement with each threaded tightening bolt and bears directly or indirectly against the second or first end plate so that the bolt head/nut associated with each threaded tightening bolt bear directly or indirectly against different ones of the first and second end plates. Each of the motors is operatively connected to a respective one of the threaded tightening bolts so that each of the threaded tightening bolts is rotatable independently of others of the threaded tightening bolts.

A plate heat exchanger includes heat exchanger plates positioned between two end plates, a plurality of threaded tightening bolts each extending between one of the end plates and a drive unit, and through the other end plate, and a plurality of motors collectively defining the drive unit. The threaded tightening bolts each include a bolt head that bears directly/indirectly against the first or second end plate. A nut is in threaded engagement with each threaded tightening bolt and bears directly or indirectly against the second or first end plate so that the bolt head/nut associated with each threaded tightening bolt bear directly or indirectly against different ones of the first and second end plates. Each of the motors is operatively connected to a respective one of the threaded tightening bolts so that each of the threaded tightening bolts is rotatable independently of others of the threaded tightening bolts.

An inspection system for a heat exchanger having a vision system to obtain an image of an inner surface of the at least one tube.

Methods and apparatus for shredding cooling tower debris are provided herein. In some embodiments, a method of preparing debris for disposal includes: receiving debris from a cooling tower; processing the received debris through a low RPM shredder to reduce the size of the debris; depositing the reduced size debris onto a conveyor; and moving the debris along the conveyor and depositing the debris into a receptacle.

Methods and apparatus for shredding cooling tower debris are provided herein. In some embodiments, a method of preparing debris for disposal includes: receiving debris from a cooling tower; processing the received debris through a low RPM shredder to reduce the size of the debris; depositing the reduced size debris onto a conveyor; and moving the debris along the conveyor and depositing the debris into a receptacle.

An electrically driven pump is provided, which includes an impeller. The impeller includes an upper plate, blades and a lower plate. The blades are formed on a lower surface of the upper plate, the blades include first blades and second blades, and a length of each of the first blades is greater than a length of each of the second blades. The first blades are uniformly distributed along a circumference of the upper plate. The first blades and the second blades are distributed alternately in the circumferential direction. The first blades each include a first head portion and a first tail portion, the second blade includes a second head portion and a second tail portion, and the first tail portion and the second tail portion are aligned with outer edge of the upper plate. The impeller arranged in such manner facilitates the improvement of hydraulic efficiency and lift.