A vapor cycle system includes a condenser unit that include a condenser and a plurality of mounting features. The condenser unit includes a condenser, including an inlet configured to receive pressurized gas, and an outlet configured to allow a flow of liquid out of the condenser. The plurality of mounting features are attached to the condenser unit and configured to allow the condenser unit to be mounted in a vehicle in a plurality of orientations with respect to gravity. The outlet is positioned at a lowermost point of the condenser in each of the plurality of orientations. The vapor cycle system is configured to cool a thermal load in a vehicle.

A closed loop cooling system can include a first condenser having a first inlet to receive a cooling media for removing heat from a heat source, a second condenser having a second inlet to receive the cooling media, and a header for being plumbed between a heat source and the condensers. The second condenser can be plumbed in parallel with the first condenser. The header can receive the cooling media from the heat source and selectively distribute the cooling media to either or both of the condensers. The header can have a first outlet fluidically coupled to the first inlet and a second outlet fluidically coupled to the second inlet. The second outlet can be located on the header at a lower elevation than the first outlet.

A closed loop cooling system can include a first condenser having a first inlet to receive a cooling media for removing heat from a heat source, a second condenser having a second inlet to receive the cooling media, and a header for being plumbed between a heat source and the condensers. The second condenser can be plumbed in parallel with the first condenser. The header can receive the cooling media from the heat source and selectively distribute the cooling media to either or both of the condensers. The header can have a first outlet fluidically coupled to the first inlet and a second outlet fluidically coupled to the second inlet. The second outlet can be located on the header at a lower elevation than the first outlet.

Systems and methods are provided for evaluating performance of a heat exchanger, such as a condenser, using rules-based logic. A plurality of sensors can measure various operating properties of the heat exchanger and transmit corresponding measurement information to a controller. The controller can (i) evaluate the measurement information for a plurality of rules in which each rule considers an operating parameter of the heat exchanger that is based on the measurement information to provide a set of operating values; (ii) compare the set of operating values to a rules matrix in which each of a plurality of possible diagnoses for the heat exchanger are associated with a corresponding set of predetermined values from a set of the plurality of rules; and (iii) based on the comparison, determine at least one likely diagnosis for the heat exchanger from among the plurality of possible diagnoses.