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Micro Hydro Heat Pump project needs design resources

Micro Hydro Heat Pump project needs design resources

Micro Hydro Heat Pump project needs design resources

(OP)
I am designing and building a water to water heat pump to be directly driven (the runner is fixed to the end of an open drive compressor) by a turgo runner.  I am looking for design resources for many aspects of this project.

A few initial questions:
1. Which open-drive or automotive compressor would be the best choice.  Efficiency is a high priority.
2.  My water source is a 40 degree F spring running at 5gpm.  Can I capture heat below freezing?

PROJECT SPECIFICATIONS

Mechanical Input Power: 1-3 kw
RPM Range: 1000-2500 rpm
Hot water will be used for hydronic heating

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