The system of air-conditioning with capillary tube technology
|
| The system of air-conditioning with capillary tube technology |
|
|
Energy
An All-Air Systems is designed to control the indoor air temperature and humidity, and provide fresh, filtered air to buildings occupants. The majority of air-conditioning systems currently in operation are all-air systems, meaning that they employ air not only for the ventilation task, but also as heat and humidity transfer medium.
The overall energy used to cool buildings with all-air systems includes the energy necessary to power the fans that transport cool air through ducts.
The KaRo Capillary Tubes System employs long-wave (infrared) radiation to the cooled surface to remove unwanted heat from the space, and maintains acceptable Indoor Air Quality and controls Indoor Air Humidity by supplying filtered, dehumidified air through its air distribution system. In its operation as an air-conditioning systems, KaRo capillary Tubes System separates the task of sensible cooling from those of humidity control and DOAS (Dedicated Outdoor Air System) with no recirculation of air.
Because it relies on radiation from cooled surface to provide sensible cooling, the KaRo Capillary Tubes System can provide comfort at a higher indoor Air Temperature than all air-system.
The KaRo Capillary Tubes System uses water as a transport medium mechanism to connect the interior radiant surface at a temperature of approximately 62? F (16? C) thus the full operation hours of the Capillary Tube System and the DOAS (Dedicated Outdoor Air System) are less because of the milder water temperature of the cool ceiling.
Water is better heating and cooling agent than air, which would require a much larger volume to transport (1,000 times more) the same heating and cooling capacity!
The smaller diameter of the tubes also provides a better homogeneity and Higher Thermal Efficiency! This efficiency 98%, where 100% would correspond to an homogenous net of water!
The thermal properties of water allow the KaRo Capillary Tubes System to (1) remove a given amount of heat from a building and use less 30% of the transport energy necessary for an all air-system to remove the same amount of heat (2) shift the peak cooling demand to later in the day, and (3) more easily interface with thermal energy storage systems.
Because KaRo Capillary Tubes System can use large surfaces for heat exchange (usually the radiant surface occupies most of the ceiling or of a vertical wall surface in a space), the temperature of the cooling water must be only a few degrees lower than the room air temperature. This small temperature difference allows us to use of either heat pumps with very high coefficient performance (COP) values, or of alternative cooling sources (for example, indirect evaporative cooling), to further reduce the electric power demand of the building.
By transporting only the air necessary for ventilation purposes, the KaRo Capillary Tubes System significantly reduce both the volume and the velocity of air-transported throughout buildings, thus practically eliminating noise and draft! at the same time, because the air does not play a major sensible cooling role, it does not have to be cooled far below the air temperature. This reduces the problems caused by duct leakage and heat loss from ducts.
The relatively low air volume supplied by KaRo Capillary Tubes System also allows the reduction of space necessary for the ventilation system and its duct work. KaRo Capillary Tubes System system only required about 25% of the building volume occupied by a traditional all-air system.
Floor to floor building height can thus reduced by reducing plenum height approximately one foot per floor. Alternatively, building occupants can enjoy spaces with higher ceiling or gain an extra floor!
Electrical Consumption:
Figure 1, below summarizes the components of the electrical power demand of the all-air system and the KaRo Capillary Tube System. The values in the table show that the electrical power demand of The KaRo Capillary Tube System is only 71.5% of the electrical power demand of the all-air system.
Three tips for the planning and mode operation of KaRo Systems can help keep energy costs low. (1) DOAS (Dedicated Outdoor Air System) and pumps should be adjustable to at least two speeds and should be switched to the lowest possible speed permitted by the time of day and temperature. By lowering the speed of the motor by half it consumes than a fifth of the energy. (2) Air ducts and ventilation devices should be generously proportioned. With the small amount of air needed with the KaRo System, the space problem is no longer a criterion, which could force high air velocity. If the air velocity is lowered by one-half less than one fourth of the energy is needed for the ventilators. (3) DOAS (Dedicated Outdoor Air System) should be regulated, to prevent the air from being unnecessarily dehumidified and cooled. The room cooling with KaRo's is the economical solution. "The alternative way of heating and cooling naturally"
|
|
| © 2005 Radiant Cooling Corporation | Website Design by www.media92.com |
