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6 Modelling This section describes the thermodynamic background and mathematical basis, and presents selected simulation results for two computer models that were developed to: ♦ Calculate the heating capacity and COP as well as to study the system characteristics of residential CO2 heat pump units equipped with a tripartite tube-in-tube counter-flow CO2 gas cooler for com- bined space heating and hot water heating. ♦ Calculate transient temperature profiles and heat losses for cylin- drical single-shelled DHW tanks caused by heat transfer through the walls and by conductive heat transfer between the hot and cold water volumes inside the tank. The computer models were verified with measurements from two proto- type test rigs, which are presented in Sections 4.1/5.1, Testing of a Resi- dential Brine-to-Water CO2 Heat Pump Unit, and Sections 4.2/5.2, Testing of a DHW Tank and a Movable Insulating Plate. 6.1 Modelling of CO2 Heat Pumps Using a Tripartite Gas Cooler 6.1.1 Introduction A steady-state computer model for a CO2 heat pump using a tripartite counter-flow tube-in-tube gas cooler was developed in order to supple- ment and analyse the measurements from the prototype CO2 heat pump test rig. The model also made it possible to provide a more general analysis on how the performance of the CO2 heat pump unit will be affected by the operating conditions and the gas cooler design. 6 – Modelling 171PDF Image | Residential CO2 Heat Pump System for Combined
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