A method is provided to vaporize a working fluid using a heat sourcing fluid. A first portion of the heat sourcing fluid passes through the first section, in counter-flow with the working fluid. A second portion of the heat sourcing fluid passes through the second section, in co-flow with the working fluid. Both the first and second portions pass through the third section, in overall counter-flow with the working fluid. The working fluid passes sequentially through the third section, the first section, and the second section. The method may be used in a Rankine cycle for waste heat recovery or in a refrigerant cycle.

A heat exchange system with at least one heat exchange chamber with heat exchange chamber boundaries which surround at least one heat exchange chamber interior of the heat exchange chamber, wherein the heat exchange chamber boundaries include at least one first opening for guiding in an inflow of at least one heat transfer fluid into the heat exchange chamber interior and at least one second opening for guiding out an outflow of the heat transfer fluid out of the heat exchange chamber interior is provided. At least one heat storage material is arranged in the heat exchange chamber interior such that a heat exchange flow of the heat transfer fluid through the heat exchange chamber interior causes a heat exchange between the heat storage material and the heat transfer fluid.

A system (10) includes a fluid with components that evaporate at different temperatures, a condenser (12) with an inlet (22) and an outlet (24), a pump (14) with an outlet (28) and with an inlet (26) connected to the outlet (24) of the condenser (12), and an evaporator (16). The evaporator (16) includes an inlet (30) connected to the outlet (28) of the pump (14), an outlet (31), evaporating tubes (38), pool boiling tubes (42), and a fluid distribution system (33) for spraying the fluid over the evaporating tubes (38). The system (10) further includes a turbine (18) with an inlet (44) connected to the outlet (31) of the evaporator (16), an outlet (48) connected to the inlet (22) of the condenser (12), and a drive shaft (46). A generator (20) is connected to the drive shaft (46) of the turbine (18).

A self-contained portable heating system to heat a stored liquid in a storage tank to a desired temperature is provided. The system can comprise operatively connected components such as a generator to power a burner that can transfer energy from a combustion product, from for example, a fuel supplied by an attached fuel tank, to a heat transfer fluid through the use of a boiler. The heat transfer fluid can transfer heat from the boiler to a heat exchanger which can then transfer heat to the stored liquid in the tank. The tank can also comprise a circulating pump that can circulate the heat transfer fluid and an expansion tank that can receive the heat transfer fluid when it expands as a result of being heated. In some embodiments, the heating components can be supplied separately from storage tank so that they can be retrofit onto an existing tank.

The invention provides a low temperature heat source thermoelectric conversion system using a blend refrigerant, comprising an evaporator. A sprinkler, a first heater and a second heater are successively arranged from the top down in the evaporator, a hot well containing a blend refrigerant is connected to the sprinkler through a pipeline with a booster transfer pump, a steam dryer is arranged at the upper part of the evaporator, the steam dryer is connected with an intake end of a turbine through a pipeline, the turbine is connected with a generator, and an exhaust end of the turbine is connected with a mixer through a pipeline, a reflux device is arranged at the lower part of the evaporator, the reflux device is connected with the mixer through a pipeline, and the mixer is connected with a condenser. The invention further provides a low temperature heat source thermoelectric conversion method using a blend refrigerant. The invention can precisely control the flow ratio of vaporized refrigerant to the refrigerant lean liquid in the reflux device, so that the the refrigerant lean liquid can completely absorb the vaporized refrigerant for liquidation, thus improving the cycle efficiency of the system, and improving the operating conditions of the turbine. The system has the advantages of simple structure, low cost and easy operation.

Proposed is a heat pipe unit and a waste heat recovery boiler including the same, wherein a heat pipe unit includes a plurality of heat pipes provided inside a casing part of a waste heat recovery boiler and a plurality of connection pipes connecting the plurality of heat pipes to each other. The heat pipes are disposed in a plurality of rows along a direction in which the exhaust gas flows. The connection pipes include a plurality of first connection pipes disposed in oblique directions and connecting the plurality of heat pipes disposed in corresponding front and rear side rows, and a plurality of second connection pipes connecting the plurality of heat pipes disposed in corresponding front and rear side rows and disposed not to be parallel with the plurality of first connection pipes.