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different room temperature, thermostat setting position and door opening conditions. With the experimental results, a first order mathematical model has been developed to investigate their combined effect on energy consumption. The test results are discussed and presented. Yohanis, Y. G. and Norton, B. International Journal of Solar Energy, 2002, 22, (2), 47-61. In order to encourage the use of computer modelling in building environmental analysis, it is necessary to provide a model developed from the designer's point of view. Detailed simulation models require a high degree of expertise and familiarity, further, there is also a need for detailed information not available in the early stages of the design process. Simplified models play an important role in the early stages of a design to achieve an integrated design: firstly, they are easy to use and, secondly, they require information easily available at the start of a design. In the Early Design Model (EDM) the solar gain utilisation factor has been determined as a continuous function of thermal mass. The differences between the annual energy predictions of EDM and SERI-RES ranges from 0.1% to 4.6% for time constants ranging from 378 to 2.52 hours. In addition to energy predictions, EDM incorporates a facility which gives cost indications.
03/00338 The Early Design Model for prediction of energy and cost performance of building design options
HEAT PUMPS
Fujimoto, S. et al. Energy Conversion and Management, 2002, 43, (7), 947-960. This study is concerned with dynamic simulation of a CaO/Ca(OH)2 chemical heat pump system. The system consists of a hydration/ dehydration reactor connected to a condenser/evaporator with a control valve between. During the dehydration process, heat is supplied at 673 K for dehydration of Ca(OH)2, and steam is condensed at 293 K. During the hydration process, heat is supplied at 290 K for evaporation of water, and the heat of hydration is supplied to a load at 353 K. A mathematical model has been developed using time dependent mass and energy conservation equations and kinetic equations. Thermodynamic functions are used to calculate the thermodynamic parameters, and heat transfer in both reactors is considered. Using the dynamic model, simulation of an experimental prototype system has been performed. Various time dependent parameters, such as CaO/ Ca(OH)2 temperature, dehydration energy, condensation energy, evaporation energy, hydration energy, etc. have been compared with experimental data. The results showed that the model and the computer code was satisfactory and could be used for dynamic simulation of CaO/Ca(OH)z heat pump systems in various applications.
๐ SIMILAR VOLUMES
fibres after etchmg the surface of a heat-treated SI-TK-0 flbrebonded ceramms at 773 K Using the parabohc rate constant and the volume expansion coeffrclent of the flbre, the time required to close the pores by the formatlon of sdica layer was calculated The thickness of the free carbon layer and th