Radiant Cooling Animation

most current systems provide cooling by air however water can be an alternative to air in a lot of applications let's see how air compares with water as a cooling medium water is 832 times denser than air and has approximately four times the heat capacity is there effectively one must circulate 3,300 litres of air as opposed to one liter of water to absorb the same amount of heat sample this to provide 100 TR or tons of refrigeration worth of cooling one would need 40,000 CFM of air compared to just 32 CFM of water moreover the air pool system would need six times more power than the water cool system for just pumping clearly water is a much more potent cooling medium and cooling by water is more efficient than cooling by air radiation or radiative heat transfer is what occurs when heat radiated from one body is absorbed by another we feel warmer around a fireplace because of the heat radiated from the fireplace to our body mean radiant temperature and perceived air temperature one of the fundamental properties of heat transfer is that heat flows from a hotter body to a cooler body in any room there is constant heat exchange between the walls roof floor people and other objects the weighted average of the temperatures at which the surfaces of all such objects in a room radiate heat is the mean radiant temperature mean radiant temperature quantifies the influence of surface temperatures on human comfort for example a hot roof window is exposed to direct sunlight etc will increase the mean radiant temperature the higher the mean radiant temperature the cooler the air required to achieve thermal comfort on the other hand if the mean radiant temperature is lower occupants can feel comfortable at relatively higher air or space temperatures one of the ways of achieving efficient and sustainable cooling is therefore to a system that lowers the mean radiant temperature which will reduce the amount of energy required to provide thermal comfort panels in gradient panel type cooling copper tubes may be used for circulating chilled water piping loops of cross-linked polyethylene pipes are embedded in walls floors ceilings and chilled water is passed through them control system along with the switching controls these controls may also be used to regulate conditions using inputs from various sensors chiller a chiller is used to cool the fluid medium to required temperatures other components other components like manifolds valves pumps etc complete the layout chilled water from the chiller goes to the manifolds and is distributed through the grid of pipes installed in the room the chilled water and the pipes then absorbs heat from the ceiling or the floor making it cooler than the objects and the occupants in the room the resultant temperature difference ensures that heat from the bodies is now radiated towards the cooler building components leading to a sensation of thermal comfort radiant floor cooling as the name suggests pipes embedded under the floor cool the space above in this layout radiant ceiling cooling installed directly below structural ceiling panels with embedded pipes of pipes attached to the ceiling and covered with plaster radiant wall cooling small diameter pipes are attached to walls then plastered over or panels with embedded pipes are mounted on the walls to achieve radiant wall cooling pipes may be run from the floor as the same circuit or a distinct circuit can be installed latent heat load management using a dedicated outdoor air system comfort is as much about humidity as it is about heat while radiant panels take care of the heat in the air a dedicated outdoor air system is essential to handle humidity in the space along with dehumidification the dedicated outdoor air system accomplishes ventilation and filtration the air quantity requirement in this system is much lesser when compared to a typical air based cooling system together with a dedicated outdoor air system radiant cooling can completely address a thermal comfort requirements in any climatic zone using heat exchangers in the form of chilled water carrying pipes embedded in floors or walls or ceilings or in panels ensures the availability of a much larger area for heat exchange compared to a regular heat exchanger which is impeded by space constraints sufficient cooling can be achieved with higher chiller operating temperatures which in turn results in higher coefficient of performance for the chiller and consequently lesser energy consumption a room with a regular air based cooling system has a higher mean radiant temperature and therefore needs a lower room air temperature to make the occupants feel comfortable a radiant cooled room hawawa has a lower mean radiant temperature and can provide the same cooling effect at a relatively higher room air temperature in radiant cooling systems which have a dedicated outdoor air system as well the air requirement is considerably lesser than a regular air conditioner which is also reflected in the reduced power consumption of the overall system

Channel: Fairconditioning

Views: 76,500

Keywords: Radiant Cooling, Animation, Sustainable Cooling Technology

Id: dYjMBfORftk

Length: 7min 3sec (423 seconds)

Published: Tue Oct 30 2018