User talk:Dw31415

The energy efficiency of the chilled beam over the standard constant volume air system or VAV system is based on the following. 1) A set heating or cooling level. As with a VAV system chilled beams' water and air flows can also be backed down. 2) The cost of transporting 1 BTU of energy in water versus 1 BTU of energy in air. It takes approximately 20 times the amount of energy to transport the same BTU through a building with air versus water (ref fan power energy costs, pump power energy costs, specific heat capacity of water versus air). 3) The chillers (for air and/or water) have the same efficiencies. 4) Proper design of both the all air system and the chilled beam system.

The chilled beam system is always going to be more efficient then the all air system. The question is how much. If the specific building cannot be designed to offer a reasonable return on investment (ROI) time frame then there is little justification in its implementation. The main deterrents to the chilled beam system are as follows: 1) Added design with respect to the planning of piping and layout. 2) Concerns over control of the humidity in the space. 3) Cost differences between an all air system and a chilled beam system.

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