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18th AIVC Conference "Ventilation and Cooling" (Book of Proceedings)

The book of proceedings from the 18th AIVC Conference "Ventilation and Cooling", Athens, Greece, 23-24 September 1997

Volume 1 includes 46 papers

Volume 2 includes 25 papers

Supplementary volume includes discussion papers and additional presentations

18th AIVC Conference - Athens, Greece - 23-24 September 1997

The 18th AIVC Conference, Ventilation and Cooling, was held in Athens, Greece, 23-24 September 1997.

Contains 70 papers 

Thermal analysis of rooms with diurnal periodic heat gain, ThermSim. Part 1: Derivation. Part 2: Practical use and comparison.

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

Swedish duct leakage status.

Describes the development of the Swedish duct tightness guidelines, the "AMA system". The latest version, due in 1998, aims to increase tightness requirements once again by introducing a tightness class D as the standard requirement for larger spiroduct systems. The concern about an increasing part of the Swedish population becoming allergic and asthmatic led to the Swedish Parliament introducing compulsory inspections of ventilation systems in 1990.

Natural ventilation of the contact theatre.

This paper describes the design and development of the natural ventilation system of the new Contact Theatre Complex Manchester, UK, designed by A Goldrick of Short Ford Associates. The ventilation design is based on a stack dominant system using an "H-Pot" chimney configuration. The paper describes the development of the ventilation design of both the studio theatre and main auditorium ventilation systems.

Dehumidification by alternative cooling systems - sorption-supported dehumidification with different liquid salt solutions.

The traditional way to dehumidify the outdoor air in a heating, ventilating and airconditioning (ENAC) system is by cooling the air temperature down below the dew point.For this process a refrigeration system is necessary to realise these low temperatures.Nowadays the disadvantages of refrigeration systems are widely known. An alternativemethod to dehumidify the air is by separating the process of dehumidification and cooling.There are different ways to get low supply air temperatures for cooling the indoor spaces.

Feedback on the design of low energy buildings.

This paper presents the results from the monitoring of a low energy building, namely, the Portland Building University of Portsmouth - UK) during February and July 1997. The BMS Research Group at the University of Portsmouth has instrumented the building so that its performance can be compared with the predictions obtained at the design stage. The Building has been operational since July 1996 and the monitoring exercise commenced in January 1997. Sensors monitor air temperature, air relative humidity and slab temperature in selected areas of the building.

Characteristics values of natural ventilation and air conditioning.

This investigation is part of project NATVENT TM, a concerted action of nine institutions of seven European countries under the Joule-3 program. It aims to open barriers that blocks the use of natural ventilation systems in office buildings in cold and moderate climate zones. The choice to apply natural ventilation in office buildings is very arbitrary; it depends very much on the personal preference of the architect or taken for budgetary reasons, even sometimes not considered at all.

Use of computational fluid dynamics for modelling passive downdraught evaporative cooling.

The air flow in a Passive Downdraught Evaporative Cooling (PDEC) tower has been modelled using a Computational Fluid Dynamics (CFD) code. Water is injected into dry warm air and the interaction between the water and the air is represented using a particle transport model. This models the transfer of mass, momentum and heat between the water particles and the air in addition to predicting individual particle trajectories.