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  1. heinasirkka

    Effect of thermal inertia at resistance heaters

    Hello everybody, I'm confused about how to deduce the real applied heat at an inline resistance heater. The heater I have has 4 heating elements that is in direct contact with the refrigerant. It has rated power of 40kW (each heating element rod has 10kW). I can apply a partial power. However...
  2. heinasirkka

    Start-up precedure of sliding vane pumps?

    Dear forum users, We have a sliding vane pump installed as inline in a closed-loop power cycle working with a refrigerant. The pump serves for overcoming the pressure drop (1-2 bar). The problem is, the pump cannot deliver any flow. When we are buying from the company, we gave the refrigerant...
  3. heinasirkka

    Pressure drop along an EEV?

    Dear forum users, I have a theoretical question. We have a cycle where the condensation pressure (temperature) is too high and for reducing it I'll buy an electric expansion valve. It needs to cause a certain pressure drop. In the datasheets the pressure drop and flow rate are correlated, but...
  4. heinasirkka

    Liquid receiver connection

    Dear forum users, I'm working on a closed refrigerant loop built for university experimental research. It has some unconventional and flawed features. There is a liquid receiver at the pump's (sliding vane pump) liquid suction line (thus, between the condenser and the pump). The receiver is to...
  5. heinasirkka

    Filter dryer before rotary pump?

    Dear forum users, We have built a system however the sliding vane pump seems to be unable to maintain the flow. It starts making strange sounds (maybe it is cavitation). At very low rotation speeds (10% of nominal rpm) there is some flow but when we increase the pump speed, there is even...
  6. heinasirkka

    Curve for sliding vane pump

    Dear all, I don't know a lot about pumps and I'm having difficulties in understanding the pump curve provided by the manufacturer. I tried to contact them several times but they are not very helpful. It is a rotary positive displacement pump (sliding vane). These curves are for 1450 RPM. -...

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