Exergy and thermoeconomic analyses are herein employed to evaluate the proposed refrigeration cycle of Tabriz olefin plant. The exergetic and exergoeconomic variables of all equipment and streams are calculated. Thermoeconomic model is developed according to the total revenue requirement (TRR) method. The results indicate that the rational efficiencies of the Heat Exchanger E-104 and compressor...

We study the heat generation in ferromagnet-quantum dot-ferromagnet system by the non-equilibrium Green's functions method. Heat generation under the influence of ferromagnet leads is very different compared with a system with normal metal leads. The significant effects in heat generation are caused by the polarization angle θ associated with the orientation of polarized magnetic moment of elec...

A key component in low energy houses is the heat recovery from the ventilation air. Over recent years, the most frequently used ventilation type is the mechanical ventilation with heat recovery. This kind of ventilation results in high heat recovery but does unfortunately consume a considerable amount of electrical energy. Natural or hybrid ventilation has the potential to consume less electric...

During the operation of heat pumps, faults like heat exchanger fouling, component failure, or refrigerant leakage reduce the system performance. In order to recognize these faults early, a fault diagnosis system has been developed and verified on a test bench. The parameters of a heat pump model are identified sequentially and classified during operation. For this classification, several ‘hard’...

MARCH 2003 AMERICAN METEOROLOGICAL SOCIETY | T his commentary describes how an examination of the global heat budget allows a straightforward explanation for understanding one of the consequences of human changes in the composition of the earth’s atmosphere. Data and analysis provided in Levitus et al. (2000, 2001) on increases in heat stored within the world’s oceans provide a unique opportuni...

A thermoviscoelastic body model is formulated, that comprises the nonlinear hyperbolic heat conductivity equation. A dependence of the thermal flux relaxation time on the magnitude of heat flux and temperature has been built. The examples of solving particular problems are given. The calculation results are compared to the experimenlal ones.