A heat exchanger module with a first block of a first heat exchanger, further with a second block of a second heat exchanger, and further with an expansion valve, wherein the first block, the second block and the expansion valve are designed as an interconnected module.

A modular fluid-fluid heat transfer arrangement is disclosed. The arrangement comprising first inlet and outlet junction pipes, second inlet and outlet junction pipes; and a plurality of heat pump modules, each comprises: first inlet and outlet ports; second inlet and outlet ports; control means; and a refrigerant circulation path including: a first heat exchanger unit fluidly connected to said first inlet and outlet ports; a compressor; a second heat exchanger unit fluidly connected to said second inlet and outlet ports; and an expander; wherein, when in use, said plurality of heat pump modules are connected in parallel to each other, by their respective first inlet and outlet ports being connected to said first inlet and outlet junction pipes, respectively, and by their respective second inlet and outlet ports being connected to said second inlet and outlet junction pipes, respectively. The disclosure further relates to a method for controlling the arrangement.

Embodiments are directed to a system for retrofitting a cooling system that includes an interface module configured to be installed in a refrigerator, comprising an inlet connection, outlet connection, and heat exchange vessel, along with an inlet line connecting the interface module to a coolant plant, and a return line connecting the interface module to the coolant plant.

A refrigerant module for a vehicle includes: a heat exchanger for exchanging heat between a refrigerant introduced therein and a working fluid; a valve manifold connected to the heat exchanger and having a refrigerant flow path formed inside to supply the refrigerant to the heat exchanger or to bypass the refrigerant; and a plurality of valve assemblies mounted on the valve manifold to control a flow of the refrigerant flowing in the refrigerant flow path.