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A Rankine cycle system has a condenser, a refrigerant circulating pump connected to the condenser, a heat collecting device connected to the refrigerant circulating pump, and an expansion turbine connected to the heat collecting device and the condenser. The refrigerant circulating pump includes an

A Rankine cycle system has a condenser, a refrigerant circulating pump connected to the condenser, a heat collecting device connected to the refrigerant circulating pump, and an expansion turbine connected to the heat collecting device and the condenser. The refrigerant circulating pump includes an expansion tank or pressure vessel, a refrigerant supply conduit connected to the lower part of the expansion tank and to the condenser, and a refrigerant discharge conduit connected to the upper part of the expansion tank. An open/close valve is installed in the refrigerant supply conduit. A pressure regulating valve installed in the refrigerant discharge pipe opens when a pressure reaches a specified value or higher. A temperature regulating device can heat the refrigerant in the expansion tank to produce a refrigerant vapor of saturated temperature or higher, which vapor can be introduced into the heat collecting device.

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1. A refrigerant circulating pump, comprising: a pressure vessel that heats a CO2 refrigerant introduced into the pressure vessel such that the CO2 refrigerant reaches a supercritical state;a refrigerant introduction path connected to the pressure vessel at a lower part of the vessel;a valve dispose

1. A refrigerant circulating pump, comprising: a pressure vessel that heats a CO2 refrigerant introduced into the pressure vessel such that the CO2 refrigerant reaches a supercritical state;a refrigerant introduction path connected to the pressure vessel at a lower part of the vessel;a valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the vessel;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling a CO2 refrigerant introduced into the pressure vessel. 2. A refrigerant circulating pump according to claim 1, wherein the temperature regulating device includes a cooling apparatus disposed inside the pressure vessel in an upper region of the pressure vessel, and a heating apparatus disposed inside the pressure vessel in a lower region of the pressure vessel. 3. A refrigerant circulating pump according to claim 1, wherein the temperature regulating device regulates flow of a hot fluid medium and a cold fluid medium through the pressure vessel. 4. A refrigerant circulating pump according to claim 2, further including a conduit connecting to the refrigerant discharge path or to the upper part of the pressure vessel and a valve for decreasing the pressure in the pressure vessel and allowing introduction of the refrigerant into the pressure vessel in the conduit. 5. A refrigerant circulating pump according to claim 3, further including a conduit connecting to the refrigerant discharge path or to the upper part of the pressure vessel and a valve for decreasing the pressure in the pressure vessel and allowing introduction of the refrigerant into the pressure vessel in the conduit. 6. A refrigerant circulating pump according to claim 2, further including a liquid reservoir connected to the refrigerant introduction path and disposed such that the surface level of the liquid refrigerant in the pressure vessel is lower than that of the liquid refrigerant in the liquid reservoir. 7. A refrigerant circulating pump according to claim 3, further including a liquid reservoir connected to the refrigerant introduction path and disposed such that the surface level of the liquid refrigerant in the pressure vessel is lower than that of the liquid refrigerant in the liquid reservoir. 8. A refrigerant circulating system comprising a plurality of refrigerant circulating pumps connected in parallel, each of the refrigerant circulating pumps comprising: a pressure vessel that heats a CO2 refrigerant introduced into the pressure vessel such that the CO2 refrigerant reaches a supercritical state;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel;a valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling a CO2 refrigerant into the pressure vessel;wherein the plurality of refrigerant circulating pumps allow cooling and heating of the refrigerant in the pressure vessel by operating the refrigerant circulating pumps in a timed sequence so that a total flow of refrigerant vapor discharged from the refrigerant circulating pumps is smooth. 9. A Rankine cycle system comprising: a condenser;a refrigerant circulating pump connected to the condenser;a heat collecting device connected to the refrigerant circulating pump; andan expansion turbine connected to the heat collecting device and the condenser so that a refrigerant is introduced from the heat collecting device to the turbine to allow the turbine to output work;wherein the refrigerant circulating pump includes:a pressure vessel;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel and connected to the condenser;an open/close valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel and connected to the heating device;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling the refrigerant in the pressure vessel, andwherein the temperature regulating device includes a cooling apparatus disposed inside the pressure vessel in an upper region of the pressure vessel, and a heating apparatus disposed inside the pressure vessel in a lower region of the pressure vessel. 10. A Rankine cycle system comprising: a condenser;a refrigerant circulating pump connected to the condenser;a heat collecting device connected to the refrigerant circulating pump; andan expansion turbine connected to the heat collecting device and the condenser so that a refrigerant is introduced from the heat collecting device to the turbine to allow the turbine to output work;wherein the refrigerant circulating pump includes:a pressure vessel;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel and connected to the condenser;an open/close valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel and connected to the heating device;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling the refrigerant in the pressure vessel, andwherein the temperature regulating device regulates flow of a hot fluid medium and a cold fluid medium through the pressure vessel. 11. A Rankine cycle system comprising: a condenser;a refrigerant circulating pump connected to the condenser;a heat collecting device connected to the refrigerant circulating pump; andan expansion turbine connected to the heat collecting device and the condenser so that a refrigerant is introduced from the heat collecting device to the turbine to allow the turbine to output work;wherein the refrigerant circulating pump includes:a pressure vessel;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel and connected to the condenser;an open/close valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel and connected to the heating device;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling the refrigerant in the pressure vessel, andwherein a gas phase zone in the condenser is communicable with a gas phase zone in the pressure vessel when the open/close valve is opened. 12. A Rankine cycle system according to claim 10, wherein a gas phase zone in the condenser is communicable with a gas phase zone in the pressure vessel when the open/close valve is opened. 13. A Rankine cycle system comprising: a condenser;a refrigerant circulating pump connected to the condenser;a heat collecting device connected to the refrigerant circulating pump; andan expansion turbine connected to the heat collecting device and the condenser so that a refrigerant is introduced from the heat collecting device to the turbine to allow the turbine to output work;wherein the refrigerant circulating pump includes:a pressure vessel;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel and connected to the condenser;an open/close valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel and connected to the heating device;a pressure regulating valve disposed in the refrigerant discharge path that opens at a predetermined pressure; anda temperature regulating device for heating or cooling the refrigerant in the pressure vessel, andwherein a plurality of the refrigerant circulating pumps are arranged in parallel to allow cooling and heating of the refrigerant in the pressure vessel by operating the refrigerant circulating pumps in a timed sequence so that total flow of refrigerant discharged from the refrigerant circulating pumps is smoothed. 14. A Rankine cycle system comprising: a condenser;a refrigerant circulating pump connected to the condenser;a heat collecting device connected to the refrigerant circulating pump; andan expansion turbine connected to the heat collecting device and the condenser so that a refrigerant is introduced from the heat collecting device to the turbine to allow the turbine to output work;wherein the refrigerant circulating pump includes:a pressure vessel;a refrigerant introduction path connected to the pressure vessel at a lower part of the pressure vessel and connected to the condenser;an open/close valve disposed in the refrigerant introduction path;a refrigerant discharge path connected to the pressure vessel at an upper part of the pressure vessel and connected to the heating device;a pressure requlatinq valve disposed in the refrigerant discharge path that opens at a predetermined pressure;a temperature requlating device for heating or cooling the refrigerant in the pressure vessel; anda liquid reservoir in a zone downstream from the condenser such that the surface level of the liquid refrigerant in the pressure vessel is lower than that of the refrigerant in the liquid reservoir. 15. A method of pumping a refrigerant comprising the steps of: providing a pressure vessel;providing a refrigerant introducing path at a lower part of the vessel;providing an open/close valve in the refrigerant introduction path;providing a refrigerant discharge path at an upper part of the vessel;providing a pressure requlating valve in the refrigerant discharge path that opens at a predetermined pressure; andproviding a temperature requlating device for heating and cooling the refrigerant in the pressure vessel,wherein the refrigerant in liquid state is introduced into the pressure vessel through the refrigerant introduction path by reducing the pressure inside the pressure vessel by cooling the refrigerant in the pressure vessel to below the saturation temperature,wherein the refrigerant in the pressure vessel is discharged through the refrigerant discharge path by vaporizing the refrigerant in the pressure vessel by heating when the pressure in the pressure vessel reaches the predetermined pressure, andwherein after the vapor refrigerant is discharged from the pressure vessel, the refrigerant remaining in the pressure vessel is cooled to lower the pressure in the pressure vessel, which results in the liquid refrigerant being introduced into the pressure vessel through the refrigerant introduction path.