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thermal performance

Effect of combined heat and moisture transfer on the predicted indoor thermal environment.

Both building performance and occupants' thermal comfort are influenced by heat conduction, convection and radiation as well as condensation/evaporation. This paper presents an analysis of thermal comfort in buildings subjected to simultaneous heat and moisture transfer using numerical techniques. A model based on computational fluid dynamics has been developed for predicting the indoor thermal environment. Assessment is made of the effects of radiation heat transfer and moisture condensation on the accuracy of predicted indoor thermal comfort.

Datalogging - taking the guesswork out of building diagnostics.

Periodic or spot check measurements of indoor air quality (IAQ) parameters leave blanks in a building data profile upon which misleading or incomplete conclusions may be made. It is difficult and unwise to make decisions regarding IAQ diagnostics and corrective actions with limited data. Datalogging fills in the blanks left by periodic measurements to complete the profile thus making it a powerful tool for good building diagnostics.

A learning experience.

               

High accuracy heat flow calculation: a method to calculate the heat flow for an arbitrary wall with constant material properties in a natural climate.

The paper describes a method to calculate the heat flow through a multiple layer wall in a natural climate. The thermal properties needed for the calculation are the thermal resistance and the heat capacity of each layer, and they are assumed to be independent of the temperature. The natural climate can be measured temperatures, either surface temperatures or temperatures of the surrounding air. The method is based on well-known equations for calculating the heat flow due to a sinusoidal temperature variation.

Thermal analysis of rooms with diurnal periodic heat gain.

Temperature and cooling demand in a room summertime are influenced by numerous factors,like internal gains, ventilation, solar gain, behaviour of occupants, thermal inertia of the roomand outdoor conditions (climate).The thermal environment and cooling demand summertime are often analysed using detailedcomputer programs, which take into account the factors mentioned above (among others).Often the overview, transparency and some of the physical insight is lost using these advancedcomputer programs.In a predesign phase of a project it is preferable to do simple calculations of the thermalbeha

Study on the night-time ventilation for cooling the building having thick walls with outer insulation

Hokkaido is distinguished from the other island of Japan by having colder winters and cooler summers. The average monthly minimum is about -10 °C and summer daily average maximum around 25°C, so that efficient space heating becomes the dominant aspect But on hot days the temperature may reach 35°C, though for short period of time. There are few houses constructed to prevent overheating ID summer. I have designed and built a house for my family ID Sapporo which has cavity walls of concrete blocks insulated with urethane 100mm thick and deeply recessed, but operable widows.

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