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Whole year simulation of humidity based demand controlled hybrid ventilation in multiapartment building

The paper presents the whole year simulation of humidity based demand controlled hybrid ventilation in multiapartment building. The simulation was performed for NAPE (National Energy Conservation Agency) multifamily residential reference building. This allowed the authors to compare obtained results with earlier investigated behaviour of the NAPE building with passive stack ventilation and mechanical exhaust ventilation.

Energy-saving Effect of Thermal Energy Storage Using Introduced Outdoor Air

Recently, buildings with thermal energy storage system have increased because of its economic advantage. In thermal energy storage system using introduced outdoor air, building masses are used as thermal storage media and cooled by outdoor air introduced by a mechanical fan in night-time. In spring and autumn, the cooled building masses can work to reduce cooling load in day-time. In this study, the stored heat was calculated by using simple heat transfer models for various building masses, and the energy performance of this system was evaluated quantitatively by system simulation.

Rotary heat exchanger model for control and energy calculations

Rotary heat recovery exchangers are widely used in ventilation systems, and the units are known for their high efficiency and almost maintenance-free operation. Temperature efficiencies above 80% are not uncommon. Performing dynamical analyses of rotary heat exchangers are in many situations advantageous, especially in connection to installation of such equipment in VAV systems. Efficiencies and flows are varying parameters that are crucial for energy calculations, but also for control. The dynamical analysis can effectively be carried out by addressing a dynamical model.

Heat Recovery in Building Envelopes

Infiltration has traditionally been assumed to contribute to the energy load of a building by an amount equal to the product of the infiltration flow rate and the enthalpy difference between inside and outside. Application of such a simple formula may produce an unreasonably high contribution because of heat recovery within the building envelope. Previous laboratory and simulation research has indicated that such heat transfer between the infiltrating air and walls may be substantial.

Hybrid Ventilation System Simulation for Several Cities in Turkey

Hybrid ventilation systems combine the superior properties of natural and mechanical ventilation systems to reduce energy consumption. In this study, hybrid ventilation simulations were performed for several cities in Turkey, which have different climate conditions. Matlab/Simulink was utilized to perform the simulations. The results of these simulations were compared with that of regular air conditioning units in terms of energy consumption.

Effects of Coupled Heat and Moisture Transfers through Walls upon Indoor Environment Predictions

The non-uniform behaviour of the air inside a room, which is important in comfort analysis, can be evaluated by zonal models. While not as fine-grained as CFD simulation, they do give useful information about temperature and moisture distributions that is not available from lumped-parameter models. Therefore, we have developed a tool, called SimSPARK, to automatically build dynamic zonal simulations of a building zone.

Different facade solutions: energy and cost performance Computational analysis of sixteen case studies in Sao Paulo and Rio de Janeiro, Brazil.

This work evaluates the performance of different façade solutions, comparing simulation results of glass type and (internal and/or external) solar protection, in the cities of São Paulo and Rio de Janeiro, Brazil. For the simulations, it was considered as

OPTIMUM TRADE - OFF BETWEEN CHILLER POWER AND PUMP POWER FOR A CHILLER PLANT SERVING A COMMERCIAL BUILDING

This paper explains how to enhance the energy performance of a chiller plant designed with chillers ofequal size or unequal size and having superior coefficient of performance (COP) at part load operation.A simulation study was carried out on an air-cooled centrifugal chiller plant serving an office building.Four design options with respect to the number and nominal capacity of chillers were investigated(OP1: 6 x 1124kW; OP2: 8 x 810kW; OP3: 4 x 1213kW + 2 x 810kW; OP4: 2 x 1350kW + 2 x 1107kW +2 x 801kW).

ENERGY SAVING EFFECT BY CENTRAL VENTILATION WITH TOTAL HEAT RECOVERY INSTALLED IN A DETACHED HOUSE

Total heat exchanger model based on experimental results was incorporated in the entire buildingmodel with the stay and internal generation of heat and with window opening-closing schedule, andenergy-saving effects of total heat exchangers were evaluated including regional features in Japan.Regional differences were found in the effects, and it was found that the reduction rate of heating andcooling loads was in the range of about 2 15%, and the reduction amount of heating and coolingloads was in the range of about 0.1 11 GJ.

COMPARISON BETWEEN MEASURED AND SIMULATED LONG TERM VARIATION OF VENTILATION IN AN EXTRACT VENTILATED HOUSE

Using a passive tracer gas technique, 1 and 2 week averages of local mean ages of air have beenestimated in an occupied detached single family house in mid-Sweden during one year. In this paperthe measurement result is compared with the result of transient simulation of ventilation using theCONTAM program. The simulation shows that the whole-house air change rate is dominated by theinfiltration due to mechanically created pressure difference as long as the outdoor temperaturedifference exceeds approx. 10 C.

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