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A heat engine enclosing a chamber in housing has two zones maintained at different temperatures. The first zone receives heat energy from an external power source. The second zone is connected to the hot zone by two conduits, such that a fluid (e.g., air, water, or any other gas or liquid) filling t

A heat engine enclosing a chamber in housing has two zones maintained at different temperatures. The first zone receives heat energy from an external power source. The second zone is connected to the hot zone by two conduits, such that a fluid (e.g., air, water, or any other gas or liquid) filling the chamber can circulate between the two zones. The expansion of the fluid in the hot zone and the compression of the fluid in the cold zone drive the rotation of the housing to provide a power output. The fluid may be pressurized to enhance efficiency. A cooling fluid provided in a stationary reservoir maintains a preferred operating temperature difference between the hot zone and the cold zone. A heat storage structure containing a fluid with a high heat capacity may be provided as a heat reservoir.

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We claim: 1. A rotary engine, comprising: a housing including a chamber having, during operation, a first zone which receives energy from a heat source and a second zone which is maintained at a temperature that is lower than the temperature in the first zone; an insulator separating the first zone

We claim: 1. A rotary engine, comprising: a housing including a chamber having, during operation, a first zone which receives energy from a heat source and a second zone which is maintained at a temperature that is lower than the temperature in the first zone; an insulator separating the first zone from the second zone; a first fluid provided within the chamber, the first fluid maintaining the same phase between the first zone and the second zone; and a set of blades within the chamber structurally adapted such that, an expansion or contraction of the first fluid acting on the set of blades sets the set of blades into non-oscillating motion; wherein the first fluid flows inside the chamber in an unenclosed channel, or a discontinuous, enclosed channel. 2. A rotary engine as in claim 1, further comprising fluid guides provided within the chamber for guiding a flow of the first fluid between the first zone and the second zone. 3. A rotary engine as in claim 1, wherein the first fluid comprises a gas. 4. A rotary engine as in claim 1, further comprising a one-way valve positioned between the first zone and the second zone to prevent back-flow of the first fluid from the first zone to the second zone. 5. A rotary engine as in claim 1, wherein a second fluid is circulated during operation between the second zone and a fluid source external to the housing. 6. A rotary engine as in claim 5, wherein the motion of the set of blades sets the housing into rotary motion, the rotary engine further comprising a member attached to the housing adapted for rotation about the axis of the rotary motion of the housing. 7. A rotary engine as in claim 6, wherein the member has a threaded passage for drawing the second fluid from the fluid source into the housing. 8. A rotary engine as in claim 6, wherein passages coupled to the member are provided throughout the second zone for distributing the second fluid drawn by the member. 9. A rotary engine as in claim 8, wherein one of the passages is provided as a spiral conduit in a portion of the insulation layer abutting the second zone. 10. A rotary engine as in claim 9, wherein one of the passages is provided between the housing and a surface of the second zone of the chamber allowing the second fluid to flow external to the housing. 11. A rotary engine as in claim 1, further comprising a heat storage structure located in the vicinity of the first zone. 12. A rotary engine as in claim 11, wherein the heat storage structure comprises a conductive plate adapted for heat transfer between the heat storage structure and the first zone. 13. A rotary engine as in claim 12, wherein the heat storage structure further comprises one or more springs loaded to urge the conductive plate into contact with the first zone as a result of a rise in temperature in the first zone. 14. A method for providing a rotary engine operating from a temperature difference, comprising: providing a chamber in a housing having, during operation, a first zone which receives energy from a heat source and a second zone which is maintained at a temperature that is lower than the temperature in the first zone; insulating the first zone from the second zone; providing a first fluid within the chamber; and maintaining the first fluid in the same phase between the first zone and the second zone;and providing a set of blades that is structurally adapted to be driven into a non-oscillating motion as a result of an expansion or contraction of the first fluid; wherein the first fluid flows inside the chamber in an unenclosed channel or a discontinuous, enclosed channel. 15. A method as in claim 14, further comprising providing fluid guides for guiding a flow of the first fluid between the first zone and the second zone. 16. A method as in claim 14, wherein the first fluid comprises a gas. 17. A method as in claim 14, further comprising providing a one-way valve to prevent back-flow of the first fluid from the first zone to the second zone. 18. A method as in claim 14, further comprising driving an axle into rotary motion by the rotary motion of the housing. 19. A method as in claim 14, further comprising circulating a second fluid during operation between the second zone and a reservoir external to the housing. 20. A method as in claim 19, wherein the motion of the set of blades sets the housing into a rotary motion, the method further comprising attaching to the housing a member which rotates about an axis of the rotary motion of the housing. 21. A method as in claim 20, further comprising providing a threaded passage in the member for drawing the second fluid into the housing. 22. A method as in claim 20, further comprising providing passages throughout the second zone to distribute 15 the second fluid drawn by the member. 23. A method as in claim 22, wherein providing a spiral conduit as a passage for the second fluid in a portion of the insulation layer abutting the second zone. 24. A method as in claim 23, further comprising providing a passage between the housing and a surface of the second zone of the chamber. 25. A method as in claim 14, further comprising providing a heat storage structure located in the vicinity of the first zone. 26. A method as in claim 25, further comprising providing a conductive plate in the heat storage structure, the conductive plate being adapted for heat transfer between the heat storage structure and the first zone. 27. A method as in claim 26, further comprising providing one or more springs which are loaded to urge the conductive plate into contact with the first zone as a result of a rise in temperature in the first zone. 28. A rotary engine as in claim 1, wherein the motion of the set of blades rotates the first fluid. 29. A rotary engine as in claim 1, wherein the set of blades are located in the first zone. 30. A rotary engine as in claim 1, wherein the set of blades have internal conduits for fluid to flow through. 31. A rotary engine as in claim 1, wherein the set of blades is located between the first zone and the second zone. 32. A rotary engine as in claim 1, wherein the first fluid moves in a rotational motion between the first zone and the second zone. 33. A rotary engine as in claim 1, wherein the set of blades is located in the second zone. 34. A rotary engine as in claim 1, wherein the set of blades is coupled to the housing. 35. A rotary engine as in claim 34, further comprising an axle coupled to the housing and that provides mechanical output power. 36. A rotary engine as in claim 34, wherein the housing provides mechanical output power. 37. A rotary engine as in claim 5, wherein the fluid source is a reservoir. 38. A rotary engine as in claim 1, wherein the first fluid flows from the first zone to the second zone over a different path than from the second zone to the first zone. 39. A rotary engine as in claim 1, wherein the set of blades contains blades with asymmetric blade faces. 40. A rotary engine as in claim 1, wherein the set of blades contains impulse type blades. 41. A rotary engine as in claim 1, wherein the set of blades contains reaction type blades. 42. A rotary engine as in claim 1, wherein the set of blades accelerates the first fluid. 43. A rotary engine as in claim 1, wherein the set of blades creates torque. 44. A rotary engine as in claim 1, wherein the first fluid motion is by expansion and contraction. 45. A rotary engine as in claim 1, wherein the first fluid motion has linear velocity. 46. A rotary engine as in claim 1, wherein the first fluid motion creates pressure on the blades. 47. A rotary engine as in claim 1, wherein the first fluid path rotates about an axis between the first zone and the second zone. 48. A rotary engine as in claim 42, wherein the first fluid flows in parallel with the set of blades are parallel to the first fluid flow. 49. A rotary engine as in claim 1, wherein the set of blades control a pressure in the first fluid. 50. A rotary engine as in claim 1, wherein the set of blades are coupled to an internal wall detached from an interior wall of the housing. 51. A rotary engine as in claim 1, wherein the first set of blades create a torque from the motion of the first fluid. 52. A rotary engine as in claim 1, wherein the first fluid has a continuous fluid flow. 53. A rotary engine as in claim 1, wherein the momentum of the first fluid at the end of an engine cycle is substantially utilized at the beginning of a next engine cycle. 54. A rotary engine as in claim 1, wherein the set of blades perform multiple functions. 55. A rotary engine as in claim 1, wherein the set of blades are coupled through a heat exchange to a heat source or a cooling source. 56. A rotary engine as in claim 1, wherein the set of blades increases a size of the heating or cooling surface. 57. A rotary engine as in claim 1, wherein the set of blades create channels for the first fluid to circulate. 58. A rotary engine as in claim 2, wherein the fluid guides are positioned to direct the first fluid flow in a direction to the set of blades to increase the torque created by the first set of blades. 59. A rotary engine as in claim 1, wherein spaces exist between the first zone and the second zone. 60. A rotary engine as in claim 1, wherein faces of the set of blades are bathed in the first fluid. 61. A heat engine, comprising: a heat source; a chamber including a working fluid and having a first zone and a second zone maintained at a temperature difference; an insulator adapted to maintain the temperature difference; and a heat storage device within the chamber that receives heat from the heat source. 62. A heat engine as in claim 61, wherein the heat storage device includes an expansion mechanism which expands when the temperature of the first fluid increases and contracts when the temperature of the first fluid decreases. 63. A heat engine as in claim 62, further comprising springs in the expansion mechanism to provide the expansion and the contraction. 64. A heat engine as in claim 62, wherein the expansion mechanism includes a thermal coupling structure which allows heat to transfer from the heat storage device to the first zone up to a predetermined temperature. 65. A heat engine as in claim 64, wherein the thermal coupling structure includes a thermal conductive plate. 66. A heat engine as in claim 61, wherein the heat storage device is a heat source. 67. A heat engine as in claim 61, wherein the heat storage device includes a reservoir containing a second fluid for heat storage. 68. A heat engine as in claim 61, further comprising a set of fluid guides. 69. A beat engine as in claim 68, wherein the set of fluid guides creates torque from a fluid flow of the working fluid. 70. A heat engine as in claim 68, wherein the fluid guides are coupled through a heat exchange to the heat storage device. 71. A heat engine as in claim 61, wherein the working fluid flows by expansion or contraction due to the temperature difference between the first zone and the second zone. 72. A method for providing a heat engine, comprising: providing a heat source and a chamber including a working fluid and having a first zone and a second zone maintained at a temperature difference; providing a first thermal structure adapted to maintain the temperature difference; providing a beat storage device within chamber that receives heat from the heat source. 73. A method as in claim 72, wherein the heat storage device includes an expansion mechanism such that expands when the temperature of the first fluid increases and contracts when the temperature of the first fluid decreases. 74. A method as in claim 73, further comprising providing springs in the expansion mechanism for expansion and contraction. 75. A method as in claim 73, wherein the expansion mechanism includes a thermal coupling structure allowing heat to transfer from the heat storage device to the first zone at a predetermined temperature of the heat storage device. 76. A method as in claim 72, wherein the heat storage device includes a heat source. 77. A method as in claim 72, wherein the heat storage device includes a reservoir containing a second fluid for heat storage. 78. A method as in claim 72, further comprising providing a set of fluid guides. 79. A method as in claim 75, wherein the thermal coupling structure includes a thermal conductive plate. 80. A method as in claim 78, wherein the set of fluid guides creates torque from a fluid flow of the working fluid. 81. A method as in claim 78, wherein the fluid guides are coupled through a heat exchange to the heat storage device. 82. A method as in claim 72, wherein the working fluid flows by expansion or contraction from the temperature difference between the first zone and the second zone. 83. A rotary engine, comprising: a rotational output device and a chamber including a working fluid and having a first zone and a second zone maintained at a temperature difference; and an insulator adapted to maintain the temperature difference; an external fluid source external to the chamber that includes an external fluid; a flow control structure that controls a fluid flow of the external fluid between the external fluid source and the chamber, the fluid control structure being structurally adapted such that a rotational motion of the rotational output device determines the fluid flow. 84. A rotary engine as in claim 83, wherein the flow control structure includes threaded passages. 85. A rotary engine as in claim 83, wherein the flow control structure moves fluid into the chamber. 86. A rotary engine as in claim 83, wherein the external fluid source includes a reservoir. 87. A rotary engine as in claim 83, further comprising a set of fluid guides. 88. A rotary engine as in claim 87, wherein the set of fluid guides creates torque. 89. A rotary engine as in claim 87, wherein the set of fluid guides include internal conduits that are coupled to the fluid control structure and in which the external fluid flows. 90. A rotary engine as in claim 83, wherein the external fluid is a cooling fluid. 91. A rotary engine as in claim 83, wherein the rotational output device includes walls of the chamber. 92. A rotary engine as in claim 83, further comprising a set of passages in the first zone coupled to the flow control structure, wherein the external fluid flows through the set of passages. 93. A rotary engine as in claim 92, further comprising a second set of conduits coupled to the set of passages that allow the external fluid to flow external to the chamber. 94. A rotary engine as in claim 93, wherein the second set of conduits allow the external fluid to flow between the chamber and the external fluid source. 95. A rotary engine as in claim 94, wherein the external fluid flows outward from the chamber through the second set of conduits. 96. A method for providing a rotary engine, comprising: providing a rotational output device and a chamber including a working fluid and having a first zone and a second zone maintained at a temperature difference; and providing an insulator adapted to maintain the temperature difference; providing an external fluid source external to the chamber that includes an external fluid; providing a flow control structure that controls the fluid flow of the external fluid between the external fluid source and the chamber, the flow control structure being structurally adapted such that a rotating speed of the rotational output device determines the fluid flow. 97. A method as in claim 96, wherein the flow control structure includes threaded passages. 98. A method as in claim 96, wherein the flow control structure moves fluid into the chamber. 99. A method as in claim 96, wherein the external fluid source includes a reservoir. 100. A method as in claim 96, further comprising providing a set of fluid guides. 101. A method as in claim 100, wherein the set of fluid guides creates torque. 102. A method as in claim 100, wherein the set of fluid guides includes internal conduits coupled to the fluid control structure and in which the external fluid flows. 103. A method as in claim 96, wherein the external fluid includes a cooling fluid. 104. A method as in claim 96, wherein the rotational output device includes walls of the chamber. 105. A method as in claim 96, further comprising providing a set of passages in the first zone coupled to the flow control structure and in which the external fluid flows. 106. A method as in claim 105, further comprising providing a second set of conduits coupled to the first set of passages that allow the external fluid to flow external to the chamber. 107. A method as in claim 106, wherein the second set of conduits allow the external fluid to flow between the chamber and the external fluid source. 108. A method as in claim 107, wherein the external fluid flows outward from the chamber through the second set of conduits. 109. A method as in claim 14, wherein the set of blades are provided in one or more of the following locations: the first zone, the second zone and between the first zone and the second zone. 110. A method as in claim 14, wherein the set of blades are coupled to the housing. 111. A method as in claim 110, wherein the housing provides mechanical output power.