Сonditions for the appearance of hydraulic shock in solar installation systems
DOI:
https://doi.org/10.15276/opu.3.56.2018.05Keywords:
hydraulic shock, solar installation systems, inertia of pumps, hydrodynamic instabilityAbstract
Hydraulic shock (HS) in solar installation can significantly affect on their reliability. A method for determining the conditions and
consequences of hydraulic shock caused by aperiodic hydrodynamic instability due to inertia of pump head-flow is presented. Criteria of
conditions of Hydraulic shock when starting pumps in standard circuits of solar installations depending on the delay time of the head-flow
and time to reach a coolant steady state are found. A solution was found for the maximum pressure amplitude under hydraulic shock. Unlike
the well-known Jukowsky formula, it considers the design and technical characteristics of the hydraulic circuit of solar installations, the
inertia of head-flow characteristic of pump, and transition of kinetic energy of coolant stagnation to energy of pressure pulse of hydraulic
shock. Hydraulic shock is a consequence of aperiodic and oscillatory hydrodynamic instability in solar installations. Aperiodic
hydrodynamic instability may occur in transient conditions (for example, starting the pump). Oscillatory hydrodynamic instability may occur
in operating conditions. Hydrodynamic instability is caused by inertia of head-flow characteristic of pumps in both cases. Inertia of headflow characteristic of pumps is mean a time delay of the response of head-flow characteristic of pumps to change the flow hydrodynami parameters. We can use found results to eliminate causes and consequences of HS for operability and reliability of pump designs of solar installations.
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