This package allows the user to build a basic heat pump system by following a step-by-step procedure.
The complete heat pump model is composed by the following components: a compressor (scroll-type), two plate heat exchangers
one liquid receiver, a valve and two pressure drop model.
- Step1 We start by modeling the condensation of the working fluid with the following components:
- Flow1Dim: It represents the flow of the working fluid
- Source_T: it represents the temperature source --> it allows the condensation of the fluid
- SinkP: pressure sink. It imposes the pressure to the system
- SourceMdot: Mass flow source. It imposes mass flow and inlet temperature to the system
- Step2 We replace the Flow1Dim component with an heat exchanger component where the secondary fluid
is considered incompressible --> Hx1DInc.
- Choose StandardWater as working fluid for the secondary fluid
- Choose upwind-AllowFlowReversal as discretization scheme
- Impose constant heat transfer coefficient in the working fluid side
- Impose an heat transfer coefficient depending on mass flow in the secondary fluid side
- Step3 Add the Liquid receiver after the condenser.
The pressure is imposed by the pressure sink connected to the liquid receiver.
- Step4 Change the pressure sink after the liquid receiver with a volumetric flow sink. In this way
the pressure will be imposed by the tank system.
- Step5 Add the Valve component after the liquid receiver
- Step6 Add the evaporator after the valve considering the secondary fluid as an incompressible fluid --> Hx1DInc.
- Choose Air as working fluid for the secondary fluid
- Choose upwind-AllowFlowReversal as discretization scheme
- Impose constant heat transfer coefficient in the working fluid side
- Impose an heat transfer coefficient depending on mass flow in the secondary fluid side
- Step7 Add the Compressor compoennt and the Electric drive component which
will allow to control the rotational speed fof the compressor. Add finally a constant source from the Modelica library (Constant source) to impose a constant rotational speed to the system.
- Step8 Close the cycle and simulate over 100 seconds
- Step9 Add pressure drop that are considered lumped in the lowest vapor density regions of both low and high pressure lines. Simulate over 100 seconds
- Step10 In order to evaluate the dynamic performance of the system impose a variation in the compressor rotational speed at 50s and a variation in the aperture of the valve at 75s.
In order to get a better visualization of the results the authors suggest the use of the ThermoCycle viewer which can be easly downloaded from http://www.thermocycle.net/.
Contents
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.ThermoCycle.Examples.Simulations.step_by_step.HeatPump_R407c
step1
step2
step3
step4
step5
step6
step7
step8
step9
step10