The performance of radiant floor heating panels with different arrangements in room and different room air temperatures are investigated experimentally and numerically. In addition to study the effect of radiant floor heating arrangement on thermal comfort conditions in occupied zone. The room air and panels temperatures are measured at different heights and locations. The temperature of supplying hot water fluctuates from 35 to40 °C. The results present that the different radiant floor heating arrangements effect on thermal comfort while the performance of radiant floor heating panel is little affected by arrangements. Experimental results appear good agreement with numerical results.
Radiant floor heating panels of a room with different locations is modeled by using CFD. All cases is simulate by employing k-ε equation turbulence model. After validation of code, average room air temperature, vertical air temperature difference and velocity of room air are used to predict the thermal comfort conditions in the occupied zone. Effect of indoor room air temperature and radiant floor heating panel locations on thermal conditions in occupied zone is studied. The results present that both the indoor room air temperature and radiant floor heating panels locations have effect on thermal comfort conditions and at low indoor temperature the radiant floor heating panel is insufficient to achieve thermal comfort conditions but can be reduced heating load.
The present study represents the experimental study for the performance of the chilled ceiling and it ability to achieve thermal condition in occupied zone. The experimental study included the effect of different internal load of (1600, 1300and 1000) W and different supplied chilled water temperatures of (13.3, 14.2, 16.8 and 18)°C on the performance of chilled ceiling. The experimental results show that the cooling capacity of chilled ceiling increases as temperature of supplied water decreases. For decreases in temperature of supplied chilled water by 33.5%,the cooling capacity of chilled ceiling is increased by 18.73%.This study presented theoretical study of velocity and temperature distribution in occupied zone when using chilled ceiling.
In the hot periods of the year, people’s work efficiency is affected by
comfort conditions which are provided by an air conditioning system.
Today, most power consumption and environmentally unfriendly systems are
used as an air conditioning systems. For these reasons, An economical
and environmentally friendly system with a new design is presented in
this paper. The proposed design uses air and water as a working fluid
with photovoltaic panels (PV) for providing the required electric power.
The new technique is used to supply additional cooling for air and water
by using thermoelectric panels. This new design consists of a cooled
wall with displacement ventilation combined with cooling evaporative
devices which are powered by PV panels. The analysis of the heat and
mass transfer of the proposed system is presented. Computational fluid
dynamic (CFD) is utilized for the investigation of thermal comfort
conditioning in an occupied zone.
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