Heat transfer plate and plate heat exchanger

A heat transfer plate configured to be arranged in a plate heat exchanger, the heat transfer plate comprising

• a first side, a second side, a third side and a fourth side that form a periphery of the heat transfer plate, the first side being opposite to the second side and the third side being opposite to the fourth side,
• a first port opening and a second port opening that are arranged at a distance from each other for allowing a first fluid to flow over a top surface of the heat transfer plate, from the first port opening to the second port opening, wherein an axis of the heat transfer plate extends through a center of the first port opening and through a center of the second port opening,
• a first side opening at the first side and a second side opening at the second side, for allowing a second fluid to flow over a bottom surface of the heat transfer plate, from the first side opening to the second side opening,
• a number of rows where each row has alternating tops and grooves that extend along a central plane of the heat transfer plate, between a top plane and a bottom plane of the heat transfer plate, the top plane and bottom plane being substantially parallel to the central plane and located on a respective side of the central plane, where a transition between a top and an adjacent groove in the same row is formed by a portion of the heat transfer plate that is inclined relative the central plane, and
• plate portions that extend along the central plane of the heat transfer plate, between the rows of tops and grooves, such that at least some of the rows of tops and grooves are separated from each other and the plate portions thereby form flow channels between the rows of tops and grooves.