Comportement dynamique dʹune pompe à chaleur au CO2 en cycles sous critique et transcritique

The authors present results of an experimental and theoretical study on the behaviour of a CO2 air-to-water heat pump. The test rig featured a semi-hermetic compressor, a shell-and-tube gas cooler, a cross-counterflow evaporator, a counterflow intermediate exchanger and a suction line accumulator. The model is based on equations governing the conservation of mass and energy and takes into account the thermal inertia of all the components in order to simulate operation under transient conditions. The convective heat transfer coefficients used for single-phase, two-phase or supercritical fluids are derived from the literature. A comparison between the results obtained using the model and those obtained experimentally was performed for steady-state and transient conditions.