The purpose of the work was to experimentally determine
the characteristics of the prototype of a Roto-Jet pump (the Pitot tube
pump) during its operation under conditions typical for the domestic micro
power plant. The low-boiling fluid, sold under the trade name of HFE7100
and characterised by a zero ozone depletion potential (ODP) coefficient,
was used as a working medium in the organic Rankine cycle (ORC). An
electric thermal oil heater with a maximum power of 2×24 kWe was used
as a heat source. The pump of Roto-Jet type was specially designed for the
operation with the following rated parameters of the thermodynamic cycle:
nominal flow rate of the working fluid 0.17 kg/s, operating pressure 1.2 MPa.
The pump was put under load using an expansion valve that simulated the
operation of an expansion machine. The article discusses thermodynamic
and flow conditions to be met by the pumping engine as well as results of
the experimental research. Moreover, the article includes the operational
characteristics of the ORC installation and the Roto-Jet pump obtained
during the operation with the target working medium – HFE7100. The
engineering problems the authors of this article faced when designing and
testing the pumping engine prototype are also presented.
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