Efficiency Of Hybrid Systems Research Articles

Application of system identification modelling to solar hybrid systems for predicting radiation, temperature and load

Uncertainties in local solar radiation, ambient temperature and thermal load data have been one of the major factors limiting the reliability and efficiency of solar thermal hybrid systems. In the present paper, moving average auto regressive exogenous (ARX) model based reasoning has been mooted and modified to include moving average method, as an effective tool for predictions of these data. The results show that the method is quite robust and is capable of predicting fairly accurate results, which would make these systems more viable in areas where meteorological data are not available or vague.

A Comparison of Hybrid Heating Systems and New Generation Facilities for Peak Electricity Load Management

This paper presents a preliminary evaluation of hybrid heating systems as an electric load-management tool for Canadian utilities, based on an analysis of data for the Province of New Brunswick. In comparison to all-electric systems, the study indicates that hybrid heating systems offer many advantages: they are less costly when peak electricity generation is provided by combustion turbines; they can eliminate the need for new peak generating capacity within the 15 year planning horizon of the utility; the higher energy conversion efficiency of hybrid systems reduces oil consumption, and C02 and SOx emissions; and they can be produced, installed and maintained locally, unlike the major components of power plants and many of their installation and maintenance services, which are imported. The constraints upon implementation of the technology are also discussed. A demand management leasing scheme, in which the utility leases the hybrid heating technology from the customer, is described. It offers political and public relations advantages over more traditional cost allocation schemes and ensures the long-term availability of the technology.

A simulation study of high-capacity cellular land-mobile radio-communication systems

Considers the problem of channel assignment in Land-Mobile Radiocommunication systems. The performance of the hybrid assignment scheme under various loading conditions is evaluated by using simulation results of channel that has a cellular mobile communications system forty cells with Erlang-B service. In addition the hybrid system is compared to the fixed and dynamic systems with respect to the maximum transmission per cell that each system can support, while having a call rejection rate of no more than 2 per cent. For the same cellular system the minimum number of necessary channels (in order to establish a given quality of service for various traffic load. A conclusion is offered per cell) is determined. A conclusion reached regarding the spectral efficiency of hybrid systems with respect to the fixed systems.