"... power a turbine with energy produced when liquid cooled by stored snow is then vaporized by the heat of the surrounding air." Is it a reversed heat pump?

"... power a turbine with energy produced when liquid cooled by stored snow is then vaporized by the heat of the surrounding air." Is it a reversed heat pump? The straight heat pump has a COP of roughly 3. The reversed will have then the COP of 1/3?