heat Pump - Model overview

Model Overview

Author / organization: Matthildi Apostolou / EDF

Domain: Energy conversion device

Intended application: Optimisation processes

Modelling of spatial aspects: Lumped (single device)

Model dynamics: Quasi-static

Model of computation: To be used by an optimization algorithm

Functional representation: Implicit

heat Pump - input and output

Input and Output

Input variables :

  • Real Pdemand: thermal demand (kW)
  • Real Tdemand,in: input temperature of the demand (degC))
  • Real Tdemand,out: output temperature of the demand (degC)
  • Real Psource,max: maximum power of the heat source (kW)
  • Real Tsource,in: input temperature of the source (degC)
  • Real Tsoure,out : output temperature of the source (degC))

Output variables:

  • Real Comp: compressor’s power (kW)
  • Real COP: coefficient of performance (-)
  • Real Cond: condenser’s power (kW)
  • Real Evap: evaporator’s power (kW)
  • Real Thin: Input temperature for the condenser (degC)
  • Real THout: Output temperature for the condenser (degC)
  • Real TCin: Input temperature for the evaporator (degC)
  • Real TCout: Output temperature for the evaporator (degC)
  • Real MH: Heat flow for the condenser (kW/K)
  • Real MC: Heat flow for the evaporator (kW/K)


2 Volume Thermal Storage - related documents

heat Pump - description

Short Description

A model of a heat pump, with a variable COP. Intended to be used for optimisation processes. Temporal resolution depends on the component: for daily storage resolution can go up to an hour/minute range; for seasonal storage representative days have to be used.

Equations describing the state of the battery are time-continuous, while the sensors measuring the real-time status are discrete event-based. Given a specific heating demand profile and a heating source available at low temperature, this test allows the sizing of a heat pump, in terms of COP and compressor’s power at every time step. The objective function is the minimisation of the total exergy consumed.

In test configuration, the heat pump (coupled with the low temperature heating source) is the only technology that can satisfy the demand. The condenser’s power must therefore be equal to the demand at every time step. The evaporator’s and compressor’s power depending on the COP (temperature levels and power considered), are optimised accordingly.

Present use / development status

The model allows, by considering the 1st and 2nd thermodynamic law, the sizing of the heat pump (compressor’s power installed) and the optimisation of the temperature levels for the condenser and evaporator at each time step.


Model Details