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Showing 1 to 9 of 9 for “"internal heat exchanger"”.
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Role of internal heat exchanger in air conditioning systems
Internal heat exchangers (IHX) has been implemented into refrigeration and air-conditioning industry for a long time because of its ability to improve the efficiency of refrigeration cycles for several commonly used and potential substitution of refrigerants (R134a, R744 and R1234yf among them). It …
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The performance of a reversible R744 vapor compression system with an internal heat exchanger in continuous frosting/ defrosting cycles
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Commercial Electric Vehicle Cabin Heating System Modelling and Optimization
… by auxiliary energy demands such as cabin heating and window defrosting, which draw considerable power directly from the traction battery, thereby reducing the available driving range. Heat pump (HP) systems provide an energy-efficient alternative to resistive heating by utilizing recovered …
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Experimental and Analytical Investigation of a Two-Phase Ejector Used for Expansion Work Recovery in a Transcritical R744 Air-Conditioning System
… R744) refrigeration cycle, the supercritical heat rejection pressure can be used to maximize the system performance. In addition, large throttling losses make R744 a suitable fluid for expansion work recovery. This study presents experimental and computational results obtained from a …
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Design And Optimization Of Organic Rankine Cycle For Low Temperature Geothermal Power Plant
… was studied using twelve working fluids in base, Internal Heat Exchanger and turbine bleeding constrained and non-constrained configurations. R601a, R245ca, R600 showed highest first and second law efficiency in the non-constrained IHX configuration. The highest net power was observed for R245ca, …
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
Air source heat pump (ASHP) has been a well-received technology to provide space and/or water heating for building and industrial applications, while its efficiency and heating capacity can be severely limited when operated in cold climate. Various modifications have been proposed for cold-climate …
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ENERGY SAVINGS AND THERMAL COMFORT OF SEPARATE SENSIBLE AND LATENT COOLING AIR-CONDITIONING SYSTEMS
… energy-consuming devices, i.e. electric heaters, are often used to reheat the conditioned air in order to provide thermal comfort for the building occupants. Separate sensible and latent cooling (SSLC) AC systems are capable of providing better control of cooling at no extra overload in …
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Potentials for COP increase in vapor compression systems
… subcooling and increase of relative size of heat exchangers (HXs). Regarding work recovery ejectors, experimental results showed that the COP of the ejector system increased between 8.2% and 14.8% when compared to a conventional expansion valve system operating with R410A. The two major …
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Energieeinsparung in Kälteanlagen durch Kombination von thermostatischem Expansionsventil und innerem Wärmeübertrager
Die Erfindung der Kältemaschine macht es möglich, dass heute zu beliebiger Zeit Kälte in benötigter Menge und gewünschter Temperatur erzeugt werden kann. Aber für die Kälteerzeugung braucht man Antriebsenergie. Das Ziel dieser Doktorarbeit besteht darin, mit einer intelligenten Kombination von …