Showing papers in "Energy Conversion and Management in 1994"

TL;DR: A general approach to evaluating sedimentary basins for CO2 disposal is presented in this paper, exemplified for the case of the Alberta Basin in western Canada where a wealth of geological and hydrogeological data from more than 150,000 wells drilled by the oil industry allows for a proper estimate of the basin potential for long-term storage of CO2 captured from fossil-fuelled power plants.

TL;DR: In this paper, a theoretical study of a hybrid photovoltaic cum thermal (PV/T) solar system is presented, where air/water is made to flow in a duct placed below the surface on which the solar cells are mounted to extract heat from the system, thereby cooling the cells and increasing their efficiency.

TL;DR: In this article, the authors present an experimental study of a thermosyphon water heater with solar cells, where the solar cells are pasted directly over the absorber plate and the solar insolation falling on the aperture area of the collector, using a simple parabolic reflector.

TL;DR: In this article, all components of solar drying systems have been considered and the testing procedures for solar dryers have also been reviewed, and an attempt has been made to present the material in a self-consistent manner.

TL;DR: In this article, the authors used a finite difference method to simulate the performance of a solar water heater with photovoltaic thermal (PV/T) cells and showed that the average cell efficiency is more or less independent of the cell area.

TL;DR: In this article, a tube-in-tube heat exchanger system for thermal energy storage employing stearic acid as PCM has been investigated and the performance and heat transfer characteristics of such a system were studied.

TL;DR: In this paper, the cooling potential of earth to air heat exchangers has been investigated and an extensive sensitivity investigation has been performed in order to analyze the impact of the main design parameters on the cooling capacity of the system.

TL;DR: In this paper, a short monitoring campaign was performed with on-site visits of a trained panel of engineers to each building, in order to register all information relevant to the buildings' construction, heating, cooling, lighting, systems and all other mechanical and electrical systems.

TL;DR: In this paper, the effect of optical errors on the flux distribution around absorber tubes of Parabolic Trough Concentrators (PTCs) was investigated using simulation techniques, and it was found that the total optical error has profound effect on the intercept factor, as well as on the optical efficiency of PTCs.

TL;DR: In this article, a mathematical model for calculating the performance of a thermoelectric heat pump to achieve a specific heating load is presented, where the effects of Joulean heating and thermal conduction are considered.

TL;DR: In this article, the design data required for the computation of thermal loss in the receiver of a parabolic trough concentrator for specific absorber tube diameters, various ambient temperatures, wind velocity and absorber temperatures from 50 to 350°C in steps of 10°C are presented.

TL;DR: In this article, the authors used a 4th order Runge-Kutta Predictor-Corrector method to solve coupled ordinary differential equations to predict the pyrolysis behavior of different lignocellulosic materials.

TL;DR: In this article, a reduced order transient model of a two-zone variable air volume (VAV) system with variable chilled-water flow is developed, which consists of two environmental zones, a cooling and dehumidifying coil, a chiller and storage tank, a fan, ductwork, a pump and piping system.

TL;DR: In this article, the economic potential of industrial combined generation of heat and power (CHP) in The Netherlands and the associated reduction in CO 2 emissions are estimated and a computer model is used in which a simulation and an economic optimization of possible CHP plants are carried out individually for each of the 300 largest energy-consuming industrial plants in the Netherlands.

TL;DR: In this article, a mathematical model has been developed to evaluate the performance of an earth-air tunnel used for space cooling, and two parameters which are sufficient to determine the cooling capacity of the system have been defined.

TL;DR: In this paper, energy balance equations for a passive solar crop dryer with shallow bed, including the effect of a reflector placed over the wall of the chimney, have been written in terms of design and climatic parameters.

TL;DR: In this paper, a hot box solar cooker was tested in an indoor solar simulator with covers consisting of 40 and 100 mm thick Transparent Insulation Material (TIM) and the stagnation temperature with the 40 mm TIM was found to be 158°C, compared with 117°C without the TIM.

TL;DR: In this article, a transient analysis of a naturally ventilated greenhouse with built-in solar still and waste heat and mass recovery system (WHMRS) is presented, where explicit expressions for the transient temperature of the greenhouse inside air, still basin-water, and WHMRS have been developed so as to study the thermal performance of the integrated system.

TL;DR: The results indicate that there are serious IAQ problems in office buildings, which have been found to be the direct cause for a number of employee health problems related to the working environment as discussed by the authors.

TL;DR: In this article, the authors have discussed the problem of accessibility, high labour input and less flexibility in use of biomass energy, and their identification, the possibilities for solution and the formulation of policies.

TL;DR: In this paper, the limitations of the various models as well as the experimental data that have to be used to overcome these discrepancies are discussed, and the existing mathematical models used for the prediction of heat transfer in a Trombe wall give serious discrepancies.

TL;DR: In this paper, a problem concerning operation of a heat storage tank in connection with a combined heat and power (CHP) plant is considered, where the heat storage is used to supply the district heating system when the CHP plant is producing electric power alone and also to redistribute optimally over time the required heat production.

TL;DR: In this article, the effect of finite-time heat transfer on the performance of a solar-driven heat pump was investigated by using the theory of finite time thermodynamics, and some novel rules for the optimum choices of primary performance parameters, such as the operating temperatures of the solar collector and the working fluid in the heat exchangers, were proposed.

TL;DR: In this article, five different electricity generation options have been evaluated using nine objectives representing the energy, economic and environment systems, and a detailed sensitivity analysis has also been performed, showing that, while decentralized electricity generation from PV and diesel can be readily encouraged for households, grid electricity and electricity from fuel wood gasification can be encouraged only after the efficiency of electricity generation is improved.

TL;DR: In this paper, an experimental simulation of a grain drying system has been tested and the experimental observations have been used to evaluate the drying time for wheat crop for a given moisture content.

TL;DR: In this paper, thermal modelling and energy conservation studies on the steam Rankine cycle cooling system [Rankine engine (RE) cycle coupled with vapour compression (VC) cycle] have been undertaken using steam + NH3, steam + R-22 and steam+ R-12 as the working fluids, and their comparative studies are presented having parametric variations of various operating conditions.

TL;DR: In this paper, a switched mode PV-powered pumping system is proposed, which couples the pumping system to the PV array directly when the storage battery is fully charged as explained in Ref.

TL;DR: In this paper, the gross energy requirement (GER) for the major petrochemical products (ethylene, propylene, butadiene and benzene) and the major bulk polymers (low density polyethylene and polypropylene, polystyrene and polyvinylchloride) is determined.

TL;DR: In this article, the performance of a suspended plate solar air heater working at low and moderate temperatures with a fluid flow on both sides of the absorber plate is analyzed in steady state.

TL;DR: In this article, several approximations are presented to simplify the computations of natural draft evaporative coolers for cooling residential and commercial buildings, as well as outdoor areas, however, their design can be time consuming.