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indoor climate

Study on the Rule of Mechanical Airflow Fluctuating Characteristics Shifting in Indoor Environment

The fluctuating characteristics of airflow have impacts on the thermal comfort of people. Two kinds of mechanical airflows in indoor environment were tested and analyzed in the paper. Spectrum analysis, chaos analysis were used to study the rule of the fluctuating characteristics shifting of the mechanical airflows. The results show that the fluctuating characteristics of different kinds of mechanical winds are different. It is also found that the characteristic parameters of the mechanical airflow, such as power spectrum etc.

The Role of Indoor Climate in the European Energy Performance of Buildings Directive (EPBD)

From the beginning of 2006 all new buildings (residential, commercial, industrial etc.) must have an energy declaration based on the calculated energy performance of the building, including HVAC and lighting systems. This energy declaration must refer to the primary energy or CO2 emissions. The directive also states that the energy performance calculation must take into account the indoor climate, but gives no guidelines.

Sleeping thermal environment and bedroom air conditioning in residential buildings in subtropical areas

This paper presents the results of a study on strategies for bedroom air conditioning in HongKong, a typical subtropical city. It reports firstly on a questionnaire survey on the current situations ofsleeping thermal environment and bedroom air conditioning in residential buildings in Hong Kong. This is followed by reporting results of field monitoring of overnight indoor air temperature, relative humidity and indoor CO2 levels in bedrooms in high-rise residences.

Impact of indoor environment on human health - Egyptian experience -

This study is concerned with the impact of indoor environment on the local National health in airconditioned spaces. The present study is carried out in different applications in Egypt. Two differentmethods are utilized in the present study. An experimental measurement program and comprehensive survey are carried out for some air conditioned applications. The numerical methodsare also utilized to simulate applications that represent the effect of indoor environment onoccupancy health using different indoor air quality indices.

Energy Usage and Thermal Environment in a Low-Energy Building

An energy simulation program, ESP-r, was used for simulation of the energy requirements and indoor climate in a well-insulated terraced house in Sweden. A parameter study was performed to investigate the influence of different control schemes on energy requirement. The influence on both energy requirement and indoor climate were analysed for two different measures. Changed placement of the air temperature sensor in the heating system decreases the energy demand without deteriorating of the indoor climate.

Comparison of temperature measurement methods for the evaluation of the thermal environment in vehicles

A new standard, ISO/DIS 14505 is under preparation, dealing with the assessment of the thermal environment in vehicles, based on the equivalent temperature. The scope of this paper is to demonstrate the different results obtained when evaluating the thermal environment inside a vehicle, using the three well known parameters, air temperature, operative temperature and equivalent temperature. The tests were carried out in the winter season during heat-up of the vehicle cabin.

Study on the Characteristics of the Indoor Environment Utilizing Hybrid Ventilation and Personal Air-Conditioning Unit

In this paper, characteristics of the indoor environment utilizing hybrid ventilation system andtask-ambient air-conditioning system are investigated every hour in a year in various types of office spaces by means of dynamic cooling and heating load analysis and CFD (Computational Fluid Dynamics) simulation.Authors had investigated the characteristics of the indoor environment of a hybrid ventilation system, utilizing natural and mechanical ventilation, with CFD simulation under various conditions of incoming outdoor air [1].

Coupled Simulation of Convection and Radiation on Thermal Environment around an Accurately Shaped Human Body

The present study is directed toward an accurate analysis on the transport of sensible heat overa realistically shaped human body model by way of a coupled convection-radiation simulation technique. A low-Reynolds-number type k- e turbulence model is employed to obtain the convective heat flux distribution with greater accuracy. Configuration factors over the complex geometry are accurately calculated using a Monte-Carlo method incorporating symmetrization procedures.

Evaluation of Input - Side Parameter of Productivity by Cerebral Blood Oxygenation Changes

To evaluate effect of indoor environment quality on productivity, the changes in cerebral bloodoxygenation by near infrared spectroscopy was examined. In this study, relationship between the changes in cerebral blood oxygenation and difficulty level of task was evaluated by subjective experiments. Four tasks were given to the subjects: single-digit addition, double-digit multiplication, triple-digit addition, and triple-digit multiplication. It was evaluated that the more difficult task types to solve, the more oxygenated hemoglobin and total hemoglobin concentration were needed.

Prediction of Indoor Thermal Comfort in Vehicle by a Numerical Thermoregulation Model and CFD

Numerical prediction method in vehicle by using a thermoregulation model and CFD is described here. To achieve energy efficient car, not only improving efficiency of components like engineand compressor, but also reduction of cooling and heating load are very efficient. In this paper component to evaluate indoor thermal environment like automobile is described on recent our research results. All latest components are not combined yet perfectly. However, a thermoregulation model (65MN) combined with radiation exchange model and Computational Fluid Dynamics is mentioned.