Air distribution solutions for classrooms aiming to lower air velocities and good temperature control are studied by measurements in 6 schools and temperature simulations. Air velocity measurements showed good performance of duct and ceiling diffusers which provided maximum velocities less than 0.2 m/s and can be highly recommended for classrooms. The wall diffusers were clearly not suitable for classrooms due to high velocities up to 0.43 m/s.

The results of indoor climate investigation in 7 schools of Tallinn are analyzed in the paper.In classrooms with natural air change carbon dioxide concentration at the end of the class isvery high, up to 1.5.3.5 times more than permitted level. With high occupation rate ingymnasiums of Tallinn the good indoor climate and permitted CO2 concentration at the end ofthe class can be provided only with the use of balanced ventilation.

Many research papers have been published on the potential effects of the quality of the indoor environment on productivity in classrooms and offices. This paper (Part 3) reports the result of nationwide field measurements based on subjective questionnaire surveys and objective test scores in a unified way.

Associations between classroom ventilation and pupils’ performance were investigated in primary schools in the United Kingdom. The concentration of carbon dioxide and other parameters were monitored for three weeks in two selected classrooms in each schoo

The purpose of the present paper is to investigate the effect of outdoor weather conditions on the performance of a plate-type heat recovery ventilator. The performance should not be affected in a theoretical point of view. However, the performance varies in real applications, because of air leakage, motor heat generation, and etc. Experiments have been conducted to measure the sensible, latent, and enthalpy efficiencies by varying outdoor temperature and humidity conditions with the indoor conditions fixed at the standard heating or cooling conditions.

This paper discusses the efficiency of induction motor drives for HVAC applications, basedon measurements made on three 4kW induction motor drives. Both converter efficiency aswell as induction motor efficiency is studied and in particular the total system efficiency isdetermined. Measurements have been performed on a 4kW induction motor fed by threedifferent types of frequency converters. Converters A and B use an open loop, constant fluxcontrol, where B has a L-C filter on its output.

This paper analyses the problem of improving the performance of the mass transfer withthe standpoint of field synergy theory. It mainly studies with the view that adjusting an angle between velocity field and density field could enhance the performance of dehumidifying air-conditioner. At the same time, it cites one kind of the structure of screw type beehive wad dehumidifying airconditioner and screw baffler dehumidifying air-conditioner which is fixed with an angle, validates its performance of intensifying mass transfer and discusses the extensive applications in engineering.

This paper deals with measurements of temperature distribution of rotary heat recovery units.A special grid of thermocouples has been made to measure air temperature in equallydistributed sampling points on each side of a heat recovery wheel. Air flow rates and theamount of recirculation air (leakage) were measured using a tracer gas. The results show thatthe temperature profile is generally dependent on both the rotational speed of the wheel andthe flow rate.

The numerical and experimental analysis was carried out to study the thermal-hydrauliccharacteristics in elliptical finned-tube heat exchanger under the dry and air/water spray cooledsystem. Three kinds of major/minor axis ratios (2.5?2.8 and 3) were examined for the ellipticfinned-tube heat exchangers and the results were also compared with the corresponding circularfinned-tube having the same perimeter. The numerical results for the pressure and heat transfercoefficient at various inlet frontal velocities (1~5 m/s) are shown and compared with the availableexperimental data.

Field surveys on thermal environment were carried out at Station T which is a large station inTokyo, mainly in summer 2006. It appeared that the thermal environment in concourse isclosely related to passengers comfort. As the result of surveys, it was clarified that thermalenvironment in the concourse was not acceptable enough for passengers. At most place andtime, thermal environment in concourse was easily over 32C in SET*, upper limit ofacceptable range for passengers. In addition, thermal environment in the concourse waswidely distributed.