Multichamber heat exchanger

1. A heat exchanger system comprising:

a working fluid splitter including a working fluid splitter inlet port, a first working fluid splitter outlet port, and a second working fluid splitter outlet port;

a first heat exchanger (HE) including a first HE working fluid inlet port, a first HE working fluid outlet port, a first heat transfer medium inlet port, and a first heat transfer medium outlet port;

a second heat exchanger including a second HE working fluid inlet port, a second HE working fluid outlet port, a second heat transfer medium inlet port, and a second heat transfer medium outlet port;

a third heat exchanger including a third HE working fluid inlet port, a third HE working fluid outlet port, a third heat transfer medium inlet port, and a third heat transfer medium outlet port; and

a working fluid mixer including a first working fluid mixer inlet port, a second working fluid mixer inlet port, and a working fluid mixer outlet port; and

wherein a first working fluid flow path connects the first working fluid splitter outlet port and the first HE working fluid inlet port;

wherein a second working fluid flow path connects the first HE working fluid outlet port and the first working fluid mixer inlet port;

wherein a third working fluid flow path connects the second working fluid splitter outlet port and the second HE working fluid inlet port;

wherein a fourth working fluid flow path connects the second HE working fluid outlet port to the second working fluid mixer inlet port;

wherein a fifth working fluid flow path connects the working fluid mixer outlet port to the third HE working fluid inlet port;

wherein a total mass of working fluid exits the heat exchanger system through the third HE working fluid outlet port; and

wherein the first, second, and third heat transfer medium inlet ports are in fluid communication with first, second, and third heat transfer medium sources, respectively, and wherein at least two of the first, second, and third heat transfer medium sources are different sources.

2. The heat exchanger system of claim 1 , wherein the first and second heat exchangers are in parallel.

3. The heat exchanger system claim 2 , wherein one of the first and second heat transfer medium inlet ports is in fluid communication with an expander outlet port of an expander.

4. The heat exchanger system of claim 3 , wherein a heat transfer medium exiting the expander outlet port is a low pressure working fluid.

5. The heat exchanger system claim 4 , wherein the one of the first and second heat transfer medium inlet ports is a recuperating heat exchanger that preheats the low pressure working fluid.

6. The heat exchanger system of claim 1 , wherein one of the first and second heat transfer medium sources is charge air exiting one of a supercharger and turbocharger.

7. The heat exchanger system of claim 1 , wherein the third heat transfer medium source is engine cooling jacket water.

8. The heat exchanger system of claim 1 , wherein a ratio of a first working fluid mass flow through the first heat exchanger to a second working fluid mass flow through the second heat exchanger is controlled passively by different values of restriction for the first and second working fluid mass flows built into the working fluid splitter.

9. The heat exchanger system of claim 8 , wherein the different values of restriction comprise orifice sizes.

10. The heat exchanger of claim 1 , wherein the ratio of a first working fluid mass flow through the first heat exchanger to a second working fluid mass flow through the second heat exchanger is controlled actively by the working fluid splitter, and wherein the ratio can be changed by an external control system.

11. The heat exchanger of claim 1 , wherein the ratio of a first working fluid mass flow through the first heat exchanger to a second working fluid mass flow through the second heat exchanger is controlled passively by different values of restriction for the first and second working fluid mass flows built into the working fluid mixer.

12. The heat exchanger system of claim 11 , wherein the different values of restriction comprise orifice sizes.

13. The heat exchanger system of claim 1 , wherein the working fluid and the heat transfer medium flow in opposite directions to each other within at least one of the first, the second, and the third heat exchangers.

14. The heat exchanger system of claim 1 , wherein one of the first, second, and third heat transfer medium sources is engine cooling jacket water.