In the last decade, quite a few carbon-monoxide intoxications occurred in Hungary due to theinadequate operation of gas appliances with open combustion chamber, connected tochimneys. These cases emphasized the importance of faultless air supply of the appliancesand the safe removal of the incipient flue gases. This problem gave reason for the modellingof air supply, temperature and velocity distributions in the space that contains the gasappliance. For the modelling of changes caused by the variations in the inside or outsideambient conditions, numerical modelling can be used.

This paper conducts an experimental measuring of the airflow generated by a modern ceilingfan that has an electronic device to vary the instant rotation speed for simulating natural winds.The measuring results are then used to calculate the mean air velocity, standard deviations,turbulence intensity, equivalent frequency, power spectrum, and other comfort evaluationparameters. The results have shown that, by adopting the natural wind mode, even at a lowermean air velocity, a substantial comfort level can be achieved while consumes much lesselectric energy.

An air-condition system shall be designed to provide the required indoor environment underspecified condition. According CEN Report 1752 it could be distinguish three categories forindoor environment. Considering higher level of comfort there is a rising cost of HVACsystems.

Active chilled beams are an air conditioning solution for ventilation, cooling and heating. Bycareful design the solution can result in a comfortable indoor environment with a high degreeof individual control at a low operational cost. During the design process draught risks shouldbe analyzed since many factors can influence the resulting airflow pattern from chilled beams.The paper focuses on the factors affecting the thermal comfort in a room ventilated by chilledbeams. Both experimental results as well as theoretical considerations are included in theanalysis.

The importance of heat load and airflow pattern control for occupants’ thermal comfort is studied in a full-scale test room ventilated with chilled beams. The room was furnished with two desks, computers and table lights. Solar irradiation on window and p

Radiant panels achieved a growing success in the last years as a cooling system, because theyguarantee improvement in comfort and energy saving.The aim of the present work is to propose a method to evaluate the thermal behavior ofradiant panels used for summer cooling. Experimental observations lead to notice that part ofthe radiant load hitting panels surface is directly removed by the refrigerating fluid (DirectWater Load), never becoming a room load.

The purpose of this paper is to investigate the thermal performances and the effect on the thermal comfort of a cooling ceiling installed in an experimental test room called Minibat. With a 9.6m2 surface and controlling the temperatures on all the exterior walls of the cell, Minibat was the perfect environment for this experimental study. The studied ceiling panels were equipped with capillary mats using polypropylene as material. During the experiment we have analyzed different cases where the ceiling surface temperature varied between 15C and 19C.

Full-scale laboratory measurements were conducted to determine moisture convectionperformance on the joint of external wall and attic floor. According to field measurements inprevious studies this joint is one of the most typical air leakage paths. On this joint also thehighest air pressure difference forms in winter. Two commonly used external walls: timberframeand autoclaved aerated concrete walls were measured. The attic floor was in both casesa timber-frame structure.

Heating, ventilating and air-conditioning (HVAC) system sizing for existing single family residents in hot and humid and temperate climates present different problems. In hot and humid climates, the proper sizing of residential air-conditioning systems is an important issue, since if the system is over-sized the resulting mold problems can cause significant problems with occupants who are susceptible to airborne spores like mold that can severely affect their asthmatic illnesses.

This study was carried out in collaboration with the district heating firm RADET SA from Bucharest, Romania, in order to support the acoustic renovation of the thermal stations, to meet the modern requirements of the indoor acoustic comfort. The measurement sequence consists in the recording of the sound pressure level in a bloc of flats: inside the thermal station placed at the underground level of the building and inside the apartments. The noise level was 70 dB inside the thermal station and over 44 dB inside the apartments.