مشخصات پژوهش

The pre sent study aims to im prove the ther mal per for mance of con ven tional ra di ant base board heat ing sys - tems by propos ing a novel and mod i fied de sign with the least cost and com plex ity. The con vec tion to ra di a - tion ra tio for con ven tional and mod i fied base board de signs is com pared by sev eral ex per i men tal tests and nu - mer i cal sim u la tions of heat trans fer be tween in ter nal pipe flow and in door air con vec tive flow. By ex am in ing the tem per a ture and ve loc ity pro files of both ra di ant base boards, it is re vealed that the to tal ther mal power of the mod i fied ra di ant base board is 34% higher than that of the con ven tional one, es pe cially at the oc cu pied zone which has raised in door air tem per a ture by up to 2 °C in dif fer ent res i dent pos tures such as stand ing, sit - ting and sleep ing. Also, the re sults show that the con vec tion con tri bu tion of the mod i fied de sign of ra di ant base board is greater than the con ven tional one, more than 45% in the same con di tions, while ra di a tion con tri - bu tion also grows con sid er ably. The re sults of 3D steady - state nu mer i cal sim u la tions show that heat out put from the mod i fied ra di ant base board per cm of panel height is 3 times more than that of the con ven tional one. Con se quently, it is in di cated that the mod i fied ra di ant base board has a lower sup ply tem per a ture, lead ing to en ergy - space sav ing, while its ca pa bil ity to over come cold air down draught flow is more, which can be of in - ter est to ex perts in the ther mal com fort field. Fur ther more, by choos ing a mod i fied ra di ant base board, the re - quired length of the base board will be re duced by 50% com pared to the con ven tional one, and this can have a sig nif i cant im pact on the ar chi tec tural and eco nomic lim i ta tions of the build ing in dus try.