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3 – Theoretical Background and System Analysis 3.3.5 Testing and Modelling of DHW Tanks and Movable Insulating Plates A full scale DHW tank test rig was constructed to study the transient temperature development in cylindrical single-shell DHW tanks caused by internal and external heat transfer. The tank was also used to examine the feasibility of using a movable insulating plate to reduce the exergy losses in the tank. The design of the test rig and the test programme are presen- ted in Section 4.2, Testing of a DHW Tank and a Movable Insulating Plate, whereas the results are presented and discussed in Section 5.2, Testing of a DHW Tank and a Movable Insulating Plate, and Section 7.1.2.4, The COP vs. the Thermodynamic Losses in the DHW Tank. A transient two-dimensional heat conduction model was also developed in order to enable tailor-made calculations of the transient temperature development in cylindrical single-shell DHW tanks at topical tank designs, temperature levels, DHW demands and gas cooler heating capa- cities. The thermodynamic basis and the mathematical background for the model as well as the simulation results are presented in Section 6.2, Modelling of Cylindrical Single-Shell DHW Tanks. 65PDF Image | Residential CO2 Heat Pump System for Combined
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