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The air cooler increases the efficiency of the system by making use of the cold ambient air temperatures in the winter. The system is simulated with two expansion devices: An expansion valve (represented by dotted line in Figure 2-8) and an expansion work output device, which recovers work to assist in driving compressor. The integrated, high performance expander/compressor unit (ECU) helps to recover normally lost expansion work, significantly boosting the performance of the transcritical CO2 cycle. A hot thermal energy storage (TES) is also integrated with the heat pump system. Daily storage is found to be most suitable for the system. A couple of storage materials are discussed in the following chapters. 2.4. Modeling Figure 2-9 is a flow diagram which describes the modeling approach undertaken. Engineering Equation Solver (EES) and MATLAB were utilized to carry out the simulations. Hourly pressure, temperature, mass flow rate and ambient temperature data are collected from the sources at the Wade Utility Plant on the campus and input into the simulation model. The data is attached in the extra files. These parameters are used to calculate the cooling load using Equation (2.1). Qcoolingload mcoolwater*Cpw*(Tsupply,coldTreturn,cold) (2.1) Qheatingload mhot*(hsupply,hothreturn,hot) (2.2) Using the pressure and temperature, the enthalpy of the steam can be calculated which is utilized in Equation (2.2) to determine the heating load. The model uses some constant parameters, which are listed in the Table 2-1. A discharge pressure is selected. Using energy balance equations, the specific gas cooler (Qgascooler), evaporator (Qevap), work done by the compressor (Wcomp) and 19PDF Image | CO2 HEAT PUMPS FOR COMMERCIAL BUILDING APPLICATIONS
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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