MEI venturis are successfully being used on air handlers in the US and Canada.
Sizing the Orifice of a Venturi for Optimal Performance of an Air Handler
Several factors are taken into consideration when qualifying an air handler for conversion to venturis:
MEI studies the basic layout, noting the steam pressure, BTU rating, whether the coils are individually trapped or ganged, how is the air handler controlled, how is the condensate handled, etc.
MEI makes note of any important details and makes recommendations accordingly. Generally air handlers qualify for conversion to MEI venturis.
Sizing the orifice for a venturi for an air handler.
MEI gathers manufacturer data and client running data to get a good profile on the air handler. This includes the rated capacity of the air handler coils (manufacturer specs: BTU rating or CFM, temperature in and temperature out). The layout of the coils is important, distinguishing between coils in parallel or series to the air flow. Because the first bank of coils receives the coolest air, the load for that bank would be proportionally greater than the next bank.
MEI requires the coils be individually trapped as well as a drip leg before the controls on an air handler. MEI makes note of how the condensate is being handled? Is there lift in the return or is the condensate gravity feed to a receiver? What is the condensate return receiver back pressure? If there is lift we note the distance and diameter of the return line.
MEI then integrates this information to determine the optimal size of the orifice and placement of the venturis used with the air handler.