Heat exchanger core

A corrugated fin heat exchanger comprising a core and two tanks,

• wherein the core comprises a plurality of mutually parallel elongated tins and flat tubes, the flat tubes and the tins alternating with respect to each other, the tubes being configured for flow of a first fluid therethrough and the fins being configured for flow of a second fluid along the length of the fins from a first lengthwise end of the fins proximate a first lengthwise end of the core to a second lengthwise end of the fins proximate a second lengthwise end of the core and in contact with outer faces of the tubes,
• wherein the fins comprise one-directional louvers in the form of fin portions each cut out from a fire and the louvers being inclined in a same direction,
• wherein each of the two tanks is at a respective one of the ends of the core and end portions of the tubes pass through the tanks, and
• wherein an angle θ facing the first end of the core at which the louvers are inclined from the fins, W, and H are set to satisfy the inequation (1):
• H>Qup/(Qup−1)×ΔH (1)
• wherein,
• Qup=Qup(W,θ)=α(W)+β(W,θ)+1 (2),
• α(W)=η/(W−η) (3),
• β(W,θ)=ξ/(W·tan2 2θ−ξ) (4),
• ΔH=ΔH(W,θ)=j·W(sin θ+k·sin2 θ) (5),
• η=0.3553 (mm),
• ξ=0.5447 (mm),
• j=0.1419,
• k=4.2789,
• α and β are regression analysis coefficients,
• θ is louver angle,
• α(W) represents an effect of a greater of number of louvers oriented in a single direction in the core having one-directional louvers than in a core having two-directional louvers due to the absence of a multidirectional louver in t core having one-directional louvers, which, in a core having two-directional louvers, is interposed between sets of the louvers oriented in respective different directions,
• β(W,θ) represents an effect of absence, in the core having one-directional louvers, of a stagnant region which, in a core having two-directional louvers, occurs in a region immediately downstream from the multidirectional louver,
• H is a distance in mm between the two tanks, which is the actual height of the core,
• ΔH is the difference (H2−H1) between effective core height (H1) of the corrugated fin heat exchanger having one-directional louvers and an actual core height and a corrugated fin heat exchanger having a same actual core height H but having multi-directional louvers wherein the fins comprise respective sets of louvers inclined in opposite directions, Qup is a ratio of an amount of heat exchanged per corrugation of the corrugated heat exchanger having one-directional louvers and the amount of heat exchanged per corrugation of the corrugated heat exchanger having multi-directional louvers, and
• W is an aggregate width in mm of the louvers.