Heat pump, small power station and method of pumping heat

A method of pumping heat, comprising:

• operating a first portion, operating the first portion comprising evaporating a working fluid at a first pressure, compressing the evaporated working fluid to a second, higher pressure, and liquefying a compressed working fluid within a liquefier;
• and
• operating a second portion, the operation of the second portion comprising compressing liquid working fluid to a third pressure, which is higher than the second pressure, evaporating the working fluid which has been compressed to the third pressure, relaxing the evaporated working fluid to a pressure smaller than the third pressure, so as to generate electrical current, and liquefying relaxed evaporated working fluid within the liquefier,
• wherein the evaporating is performed by an evaporator comprising:
• a riser pipe having a riser pipe outlet,
• a funnel-shaped expander having an expander inlet with a diameter larger than that of an expander outlet, the expander inlet coupled to the riser pipe outlet,
• an evaporation chamber surrounding the expander, and
• a compressor,
• the evaporating is performed at a first pressure smaller than 20 hPa, and the compressing is performed to a second pressure which is more than 5 hPa higher than the first pressure,
• wherein the compressing to a third pressure compresses to the third pressure being higher than 0.2 MPa,
• wherein the working fluid is water, wherein the evaporated working fluid is water steam, wherein the compressed evaporated working fluid is compressed water steam, and wherein the liquid working fluid is water,
• wherein the second portion is configured to evaporate the liquid working fluid, which has been compressed to the third pressure, while using a primary energy source, the primary energy source comprising at least one of a waste gas stream of a wood-fired oven within a building or a waste gas stream of a pellet oven within the building and a heat dissipator of a solar collector on the building,
• wherein the liquefier comprises a heating advance flow for feeding heating liquid to a heating system of the building and a heating backflow for feeding the heating liquid back from the heating system into the liquefier,
• wherein the first portion is configured to employ, for compressing the evaporated working fluid, electrical current coming from the second portion or from an external power supply network, and
• wherein the second portion is configured to at least partly feed the electrical current into the external power supply network.