LAUSR

Abstract The hybrid radiant-convective heating terminal has the advantage of combining both radiant heating and convective heating. However, the existing hybrid terminals have disadvantages of manufacturing difficulties and large thermal resistance. To solve these problems, a novel radiant-convective heating terminal was designed. And an experimental system was built to measure its heating performance. The results showed that the novel terminal had better heating performance than the existing hybrid radiant-convective heating terminals. When the terminal was in operation under radiant condition, with the increase of water temperature from 35.0 °C to 45.0 °C, the radiant, natural convective and total heating capacity rose by 26.7–54.2%, 31.0–65.1% and 28.5–58.9%, respectively. When the water flow rate rose from 0.61 kg/h to 0.73 kg/h, the total heating capacity increased from 282.6 W to 285.9 W. In addition, when the terminal was in operation under radiant-convective condition, with air flow rate ranging from 367 m3/h to 660 m3/h, the radiant and natural convective heating capacity reduced by 0.6–13.2% and 3.1–17.9% separately, and the forced convective and total heating capacity rose by 18.9–33.3% and 12.7–18.8% separately. Furthermore, with the increasing outdoor air temperature, the total heating capacity was less than that of fixed outdoor air temperature by 196.3 W.