The Experts below are selected from a list of 7722 Experts worldwide ranked by ideXlab platform
R T Dobson - One of the best experts on this subject based on the ideXlab platform.
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steam jet ejector cooling powered by waste or solar heat
Renewable Energy, 2009Co-Authors: A Meyer, T M Harms, R T DobsonAbstract:A small scale steam jet ejector experimental setup was designed and manufactured. This ejector setup consists of an open loop configuration and the boiler operate in the temperature range of Tb=85–140°C. The typical evaporator liquid temperatures range from Te=5°C to 10°C while the typical water-cooled Condenser Pressure ranges from Pc=1.70kPa to 5.63kPa (Tc=15–35°C). The boiler is powered by two 4kW electric elements while a 3kW electric element simulates the cooling load in the evaporator. The electric elements are controlled by means of variacs.
A Meyer - One of the best experts on this subject based on the ideXlab platform.
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steam jet ejector cooling powered by waste or solar heat
Renewable Energy, 2009Co-Authors: A Meyer, T M Harms, R T DobsonAbstract:A small scale steam jet ejector experimental setup was designed and manufactured. This ejector setup consists of an open loop configuration and the boiler operate in the temperature range of Tb=85–140°C. The typical evaporator liquid temperatures range from Te=5°C to 10°C while the typical water-cooled Condenser Pressure ranges from Pc=1.70kPa to 5.63kPa (Tc=15–35°C). The boiler is powered by two 4kW electric elements while a 3kW electric element simulates the cooling load in the evaporator. The electric elements are controlled by means of variacs.
A. A. Tarelin - One of the best experts on this subject based on the ideXlab platform.
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Influence of the reheat temperature on the efficiency of the wet-steam turbines of thermal power plants that operate under variable conditions
Thermal Engineering, 2017Co-Authors: A. A. TarelinAbstract:A brief analysis of the existing methods for controlling the operating conditions of the turbine units that operate at variable loads is presented. In practice, the outdated rule of operation is most frequently used that states that the higher the parameters of the live and reheat steam and the lower the Condenser Pressure are, the higher is the efficiency of the turbine unit. However, in the technical literature, there is sufficiently substantiated evidence that this approach is not always correct, especially under low loads. This applies to both the regulation of the initial and final Pressure and reheat temperature t _r. In the article, particular stress is laid on the controllable parameter t _r, the effect of which in the operational practices, according to the results of the analysis, is underestimated. The causes are considered that constrain more effective use of reheat temperature t _r as a process variable. The results of field trials to investigate the influence of t _r on the efficiency of turbine units of various capacities, viz., of 210, 250, 300, and 325 MW, during operation at varying loads are presented. It is shown that a decrease in t _r to an optimal value of 10–30°C, depending on the load and the Condenser Pressure, increases the thermal efficiency by 1–2%. The following general pattern has been set: the lower the load, the lower the optimal reheat temperature. The main causes and factors that result in more efficient use of the heat phase transition in the steam path of the low-Pressure cylinder and increased efficiency of the unit under rational choice of the reheat temperature are studied.
Marc A Rosen - One of the best experts on this subject based on the ideXlab platform.
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ground source heat pumps for heating parametric energy analysis of a vapor compression cycle utilizing an economizer arrangement
Applied Thermal Engineering, 2013Co-Authors: Stuart J Self, B V Reddy, Marc A RosenAbstract:Abstract Reductions in fossil fuel use and increases in system efficiency are required to make space heating more environmentally benign. Ground loop heat pumps offer a heating option that is more environmentally benign than conventional methods. Past studies of these heat pumps have usually focused on basic system arrangements, but new advanced systems are being developed. Here, energy analyses are reported for an advanced heat pump arrangement comprised of a vapor compression cycle with an economizer. A parametric analysis is performed to identify and quantify the influence of Condenser Pressure, evaporator Pressure, intermediate Pressure, degree of subcooling at the Condenser outlet and degree of super heating at the evaporator outlet on system performance and ground loop requirements. The results show that, of the operating conditions investigated, Condenser Pressure has the greatest effect on the coefficient of performance (COP). The effect on COP of the other parameters, ranked from highest to lowest, are evaporator Pressure, degree of subcooling, intermediate Pressure and degree of superheating within this study.
T M Harms - One of the best experts on this subject based on the ideXlab platform.
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steam jet ejector cooling powered by waste or solar heat
Renewable Energy, 2009Co-Authors: A Meyer, T M Harms, R T DobsonAbstract:A small scale steam jet ejector experimental setup was designed and manufactured. This ejector setup consists of an open loop configuration and the boiler operate in the temperature range of Tb=85–140°C. The typical evaporator liquid temperatures range from Te=5°C to 10°C while the typical water-cooled Condenser Pressure ranges from Pc=1.70kPa to 5.63kPa (Tc=15–35°C). The boiler is powered by two 4kW electric elements while a 3kW electric element simulates the cooling load in the evaporator. The electric elements are controlled by means of variacs.