SIMULACE DRAFT RISKU V MISTNOSTI S ATD KONVEKTORY

DRAFT RISK SIMULATION IN A ROOM WITH AIR TRANSFER DEVICE

conference paper

en

The article describes the influence of the supply air devices that are part of hybrid ventilation system which is being developed within a EU funded project RESHYVENT as a part of this project, on thermal comfort in living-room of a three-bedroom apartment. The supply air radiator and the supply air convector are compared. The fresh air is sucked through a supply air convector and supply air radiator respectively and the air leakage through the facade is assumed too. 2 variants, which cover different outdoor temperature and supply air temperature for each device, have been solved. The main difference between them is the direction of the incoming air. Supply air radiator is like a classical radiator, outdoor air comes through the radiator, warms up and enters the room vertically. Supply air convector is stand-alone device with heat exchanger to preheat the entering air and with a back draft damper and a wind damper. In this case the outdoor air enters the room horizontally. The CFD model of the room was created and solved using the commercial code STAR-CD. Based on temperature and velocity fields, draft risk was calculated according prEN 13799:2003_01 in the occupation zone as a parameter for thermal comfort specification.

Clanek popisuje vliv dvou privodnich konvektoru ktere jsou instalovany jako casti hybridniho vetraciho systemu ktery je vyvijen v ramce projektu EU RESHYVENT na tepelnou pohodu v obyvacim pokoji tripokojoveho bytu. Jsou porovnavany dva ruzne privodni konvektory. Vetraci system funguje tak ze cerstvy vzduch je nasavan z vnejsiho prostredi do mistnosti pomoci specialnich konvektoru, pricemz se uvazuje i vliv infiltrace a odvaden je odsavaci vyustkami. V clanku jsou porovnany 2 varianty ktere se lisi teplotou venkovniho vzduchu. Hlavni rozdil mezi konvektory je ve smeru proudeni vzduchu dodavaneho temito konvektory. Supply Air Radiator je vicemene klasicky dvoudeskovy radiator, do ktereho je skrz zed potrubim privaden cerstvy vzduch ktery se pruchodem radiatoru ohriva a do mistnosti vstupuje ve vertikalnim smeru. Supply air convector je specialni zarizeni ktere obsahuje vlastni vymenik tepla spolu s termostatickym systemem, napojeny bud na radiatorovy okruh, nebo ma elektricky vymenik. Dale obsahuje mrizku zabranujici zpetnemu proudeni, a mrizku ktera zabrani zvysenemu prutoku konvektorem, ktere muze byt zpusobeno zvysenymi tlakovymi ucinky vetru na fasadu. Vzduch v tomto pripade vstupuje do mistnosti v horizontalnim smeru. Problem vetrani mistnosti byl resen CFD simulaci uzitim komercniho CFD kodu STAR CD, Draft Risk byl vyhodnocen v souladu s normou prEN 13799:2003_01 jako funkce rychlosti a teplot v mistnosti.

The article describes the influence of the supply air devices that are part of hybrid ventilation system which is being developed within a EU funded project RESHYVENT as a part of this project, on thermal comfort in living-room of a three-bedroom apartment. The supply air radiator and the supply air convector are compared. The fresh air is sucked through a supply air convector and supply air radiator respectively and the air leakage through the facade is assumed too. 2 variants, which cover different outdoor temperature and supply air temperature for each device, have been solved. The main difference between them is the direction of the incoming air. Supply air radiator is like a classical radiator, outdoor air comes through the radiator, warms up and enters the room vertically. Supply air convector is stand-alone device with heat exchanger to preheat the entering air and with a back draft damper and a wind damper. In this case the outdoor air enters the room horizontally. The CFD model of the room was created and solved using the commercial code STAR-CD. Based on temperature and velocity fields, draft risk was calculated according prEN 13799:2003_01 in the occupation zone as a parameter for thermal comfort specification.

ventilation, CFD, thermal comfort, draft risk

01.08.2004

INIVE EEIG

Brusel

2-9600355-6-9

25th AIVC Conference - Ventilation and Retrofitting

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