Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of heat load calculation for air carrying energy radiant air-conditioning system
HighlightsThe Air Carrying Energy Radiant Air-conditioning System (ACERS) is presented.ACERS has performance of high thermal comfort, saving energy and preventing condensation.A practical correction coefficient load calculation method for ACERS is developed.Correction coefficient of 0.75 and 0.8 are obtained respectively for summer and winter operation.Two basic phenomena of layering and small vortices are found in radiation heat transfer process of ACERS.
AbstractRadiant heating and cooling has been widely acknowledged as an important energy-saving technique for building air-conditioning. This paper put forward the concept of Air Carrying Energy Radiant-air-conditioning System (ACERS) to solve some of the limitations of existing radiant air-conditioning systems. Since the orifice plate of ACERS would enable radiant and convective heat transfer with indoor surfaces, using the traditional load calculation method could result in inaccuracy. Therefore, a correction coefficient method for load calculation for ACERS was developed. Based on experiments conducted in summer and winter, in a room installed with ACERS, the cooling and heating loads of the test room were calculated by traditional and newly developed Computational Fluid Dynamics (CFD) simulation method. Then the cooling and heating load calculation results of two methods were compared as the approximate correction coefficient of ACERS, which was validated as about 0.75 in summer cooling and 0.8 in winter heating. Furthermore, the components of air-conditioning load calculation are unrelated with room type, so this simplified load calculation method can be extended to other rooms with ACERS. The load calculation is the foundation of ACERS design and application, and should also contribute to energy conservation in usage of Heating, Ventilating, Air-conditioning (HVAC).
Investigation of heat load calculation for air carrying energy radiant air-conditioning system
HighlightsThe Air Carrying Energy Radiant Air-conditioning System (ACERS) is presented.ACERS has performance of high thermal comfort, saving energy and preventing condensation.A practical correction coefficient load calculation method for ACERS is developed.Correction coefficient of 0.75 and 0.8 are obtained respectively for summer and winter operation.Two basic phenomena of layering and small vortices are found in radiation heat transfer process of ACERS.
AbstractRadiant heating and cooling has been widely acknowledged as an important energy-saving technique for building air-conditioning. This paper put forward the concept of Air Carrying Energy Radiant-air-conditioning System (ACERS) to solve some of the limitations of existing radiant air-conditioning systems. Since the orifice plate of ACERS would enable radiant and convective heat transfer with indoor surfaces, using the traditional load calculation method could result in inaccuracy. Therefore, a correction coefficient method for load calculation for ACERS was developed. Based on experiments conducted in summer and winter, in a room installed with ACERS, the cooling and heating loads of the test room were calculated by traditional and newly developed Computational Fluid Dynamics (CFD) simulation method. Then the cooling and heating load calculation results of two methods were compared as the approximate correction coefficient of ACERS, which was validated as about 0.75 in summer cooling and 0.8 in winter heating. Furthermore, the components of air-conditioning load calculation are unrelated with room type, so this simplified load calculation method can be extended to other rooms with ACERS. The load calculation is the foundation of ACERS design and application, and should also contribute to energy conservation in usage of Heating, Ventilating, Air-conditioning (HVAC).
Investigation of heat load calculation for air carrying energy radiant air-conditioning system
Gong, Guangcai (Autor:in) / Liu, Jia (Autor:in) / Mei, Xiong (Autor:in)
Energy and Buildings ; 138 ; 193-205
03.12.2016
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
<italic>Q<inf>c</inf></italic><inf>(</inf><italic><inf>τ</inf></italic><inf>)</inf> , the hourly cooling load of test room envelop (W) , <italic>A</italic> , area of corresponding test room envelop (m<sup>2</sup>) , <italic>K</italic> , heat transfer coefficient of test room envelop (W/m<sup>2</sup> K) , <italic>t</italic><inf><italic>c</italic>(<italic>τ</italic>)</inf> , hourly cooling load calculated temperature of test room envelop (°C) , <italic>t<inf>RC</inf></italic> , the indoor design temperature for summer cooling (°C) , <italic>C<inf>а</inf></italic> , effective area coefficient , <italic>C<inf>c,s</inf></italic> , the comprehensive shielding coefficient of the window , <italic>D<inf>jmax</inf></italic> , the maximum solar radiant heat transfer coefficient , <italic>C<inf>LQ</inf></italic> , the cooling load coefficient of window , <italic>Q</italic> , the basic heating load of the test room envelop (W) , <italic>t<inf>RH</inf></italic> , the indoor design temperature for winter heating (°C) , <italic>t<inf>o.w</inf></italic> , outdoor calculation temperature for winter heating (°C) , <italic>а</italic> , the correction coefficient for temperature difference of test room envelop , <italic>Q<inf>a</inf></italic> , the heating load of cold air infiltration (W) , <italic>V</italic> , the air volume infiltrated per hour (m<sup>3</sup>/h) , <italic>ρ<inf>w</inf></italic> , the air density (kg/m<sup>3</sup>) , <italic>c<inf>p</inf></italic> , the specific heat at constant pressure (kJ/kg K) , <italic>q<inf>0</inf></italic> , the heat transfer of orifice plate per unit area (W/m<sup>2</sup>) , <italic>q<inf>c</inf></italic> , the convective heat transfer of orifice plate per unit area (W/m<sup>2</sup>) , <italic>q<inf>r</inf></italic> , the radiant heat transfer of orifice plate per unit area (W/m<sup>2</sup>) , <italic>q</italic><inf>f</inf> , the heat transfer of heat-carried air through orifice plate into the air-conditioning area (W/m<sup>2</sup>) , <italic>h<inf>c</inf></italic> , convective heat transfer coefficient of radiant orifice plate (W/m<sup>2</sup> K) , <italic>T<inf>k</inf></italic> , the temperature of radiant orifice plate (°C) , <italic>T<inf>n</inf></italic> , the indoor air temperature (°C) , <italic>F</italic> , the area of radiant orifice plate (m<sup>2</sup>) , <italic>Δt</italic> , heat transfer temperature difference between orifice plate and comprehensive surface (°C) , <italic>μ</italic> , the open pore ratio , <italic>G<inf>k</inf></italic> , the infiltration air volume of orifice plate (m<sup>3</sup>/s) , <italic>Φ</italic> , the heat flux density of test room envelop (W/m<sup>2</sup>) , the area of outer wall (m<sup>2</sup>) , the heat transfer coefficient (W/m<sup>2</sup> K) , <italic>t<inf>f1</inf></italic> , the inner surface average temperature of test room envelop (°C) , <italic>t<inf>f2</inf></italic> , the exterior surface average temperature of test room envelop (°C) , <italic>K<inf>1</inf></italic> , the average heat transfer coefficient of test room envelop (W/m<sup>2</sup> K) , <italic>I</italic> , the turbulence intensity , <italic>R<inf>e</inf></italic> , the Reynolds number , <italic>ννν</italic> , the average velocity of cross section (m/s) , <italic>υ</italic> , the kinematic viscosity of cross section (m<sup>2</sup>/s) , <italic>d<inf>H</inf></italic> , hydraulic diameter (m) , the area of cross flow section (m<sup>2</sup>) , <italic>S</italic> , the wetted perimeter (m) , <italic>ε</italic> , the energy saving effect of ACERS , <italic>η</italic> , load ratio , Air carrying energy , Radiant air-conditioning system , Heat load calculation , CFD simulation , Correction coefficient
Investigation of heat load calculation for air carrying energy radiant air-conditioning system
| Online Contents | 2017