Heat transfer assembly for rotary regenerative preheater

A heat transfer assembly for a rotary regenerative preheater, the heat transfer assembly comprising:

• a plurality of first heat transfer elements, each of the first heat transfer elements comprising, a plurality of corrugation sections and a plurality of flat sections, each of the corrugation sections and the flat sections are configured in an alternating manner across the width of each of the first heat transfer elements, the corrugation sections being configured parallel to the flat sections over the entire length of each of the plurality of heat transfer elements;
• and
• a plurality of second heat transfer elements, each of the second heat transfer elements comprising a plurality of undulation sections and a plurality of notches, each of the notches has adjacent double ridges extending transversely from opposite sides of each of the second heat transfer elements, wherein each of the undulation sections and the notches are configured in an alternating manner across the width of each of the second heat transfer elements, the undulation sections being configured at an angle to the notches over the entire length of each of the second heat transfer elements,
• wherein each of the first and second heat transfer elements are stacked in spaced and alternating manner to each other such that each of the notches of the second heat transfer element rests on the respective flat sections of the adjacent first heat transfer elements to configure a plurality of channels, each isolated from the other, wherein each of the channels has a configuration in a manner such that each of corrugation sections of the first heat transfer elements faces the respective undulation sections of the adjacent second heat transfer elements,
• wherein each corrugation of the corrugation sections comprises a corrugation crest and a corrugation trough and each undulation of the undulation sections comprises an undulation crest and an undulation trough, each of the corrugation troughs extending toward the second heat transfer element and each of the undulation crests extending toward the first heat transfer element, and
• further wherein at least a portion of a corrugation trough in a corrugation section between two flat sections touches at least a portion of an undulation crest in an undulation section between two notches such that there is no gap between the touching portions of the corrugation trough and undulation crest.

A heat transfer assembly for a rotary regenerative preheater, the heat transfer assembly comprising:

• one of:
• (a) a plurality of first heat transfer elements, each of the first heat transfer elements comprising a plurality of undulation sections and a plurality of flat sections, each of the undulation sections and the flat sections are configured in an alternating manner across width of each of the first heat transfer elements, the undulation sections being configured at an angle to the flat sections over the entire length of each of the first heat transfer elements, and
• a plurality of second heat transfer elements, each of the second heat transfer elements comprising a plurality of corrugation sections and a plurality of notches, each of the notches has adjacent double ridges extending transversely from opposite sides of each of the second heat transfer elements, wherein each of the corrugation sections and the notches are configured in an alternating manner across width of each of the second heat transfer elements, the corrugation sections being configured parallel to the notches over the entire length of each of the second heat transfer elements;
• wherein each undulation of the undulation sections comprises an undulation crest and an undulation trough and each corrugation of the corrugation sections comprise a corrugation crest and a corrugation trough, each of the undulation troughs extending toward the second heat transfer element and each of the corrugation crests extending toward the first heat transfer element, and
• wherein at least a portion of an undulation trough in an undulation section between two flat sections touches at least a portion of one corrugation crest in a corrugation section between two notches such that there is no gap between the portions of the touching undulation trough and corrugation crest, and
• (b) a plurality of first heat transfer elements, each of the first heat transfer elements comprising a plurality of corrugation sections and a plurality of flat sections, each of the corrugation sections and the flat sections are configured in an alternating manner across the width of each of the first heat transfer elements, the corrugation sections being configured parallel to the flat sections over the entire length of each the first heat transfer elements, and
• a plurality of second heat transfer elements, each of the second heat transfer elements comprising a plurality of undulation sections and a plurality of notches, each of the notches has adjacent double ridges extending transversely from opposite sides of each of the second heat transfer elements, wherein each of the undulation sections and the notches are configured in an alternating manner across the width of each of the second heat transfer elements, the undulation sections being configured at an angle to the notches over the entire length of each of the second heat transfer elements,
• wherein each corrugation of the corrugation sections comprises a corrugation crest and a corrugation trough and each undulation of the undulation sections comprises an undulation crest and an undulation trough, each of the corrugation troughs extending toward the second heat transfer element and each of the undulation crests extending toward the first heat transfer element, and
• further wherein at least a portion of a corrugation trough in a corrugation section between two flat sections touches at least a portion of an undulation crest in an undulation section between two notches such that there is no gap between the touching portions of the corrugation trough and undulation crest, and
• wherein, for (a) and (b), each of the first and second heat transfer elements are stacked in spaced and alternating manner to each other such that each of the notches of the second heat transfer element rests on the respective flat sections of the adjacent first heat transfer element to configure a plurality of closed channels, each isolated from the other, wherein each of the channels has a configuration in a manner such that each of corrugation sections of one of the first heat transfer elements and the second heat transfer elements faces the respective undulation sections of the other of an adjacent one of the first heat transfer elements and the second heat transfer elements.