Spray-actuated heat engine

A spray-actuated heat engine, comprising:

• a plurality of chambers comprising at least a first chamber and a last chamber, each said chamber comprising an expandable volume containing an operating fluid in the form of a gas;
• a heat transfer fluid in the form of a liquid;
• a heat source configured to heat the heat transfer fluid and a cold source configured to extract heat from the heat transfer fluid;
• wherein the heat transfer fluid is configured to be selectively sprayed into the expandable volumes of the chambers at different temperatures to mix with the operating fluids therein to selectively expand and contract the operating fluids.

A method of generating power using a spray-actuated heat engine and a heat transfer fluid, said method comprising:

• moving heat transfer fluid as a liquid by a heat source to reach a high temperature;
• and
• moving heat transfer fluid as a liquid by a cold source to reach a low temperature;
• spraying heat transfer fluid at the high temperature into an expandable volume containing an operating fluid to cause the operating fluid to expand;
• and
• spraying heat transfer fluid at the low temperature into the expandable volume to cause the operating fluid to contract;
• wherein the high temperature is higher than the low temperature.