Abstract: A modular arrangement for use in vapor-compression refrigeration system includes an evaporator, oil separator, condenser and oil cooler, arranged inside an outer casing with a longitudinal cylindrical shell and the end plates in both ends of the shell. The shell includes three separate parts, separated from each other by arranging first and second partition walls between the parts. The first part includes the evaporator, the second part includes the oil separator and the third part includes the oil cooler and the condenser. The third part including a combination of the oil cooler and the condenser is constructed by arranging one plate pack into the third part, which is divided two functional plate pack parts by an intermediate plate arranged between the heat exchange plates of the plate pack. The first plate pack part functions as oil cooler and the second plate pack part functions as the condenser.