PPORTUNITY

Welcome to    PPORTUNITY, a monthly newsletter provided by Jacco & Associates. Jacco’s focus on engineering and design concepts will improve your HVAC system while significantly reducing design time, making you more productive for your clients.

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Questions or comments? E-mail us at opportunity@jacco.com

Question:    Which of the following loads is a factor in sizing chilled beams?

                   A.) Ventilation     B.) Dehumidification     C.) Sensible Cooling     D.) All Of The Above

Prize:        Samsung 22” LCD HDTV!

Respond by December 14^th with the correct answer to be entered in the raffle for this month’s prize!

Question:  What is the #/Hr of condensate required on a 1,000 cfm system to go from 70/30%RH to 70/45% RH?

                  

Answer:    B.) 10.  Congratulations to Ed Shank for winning a Blu Ray Player!

Benefits Of New Ventilation Requirements For Hospital Patient Areas

The HVAC and lighting energy use in a hospital is more than 2.5 times that in a         commercial office building.  The single biggest energy consumption is for reheat of   supply air which is necessitated by the high ventilation rates in healthcare facilities.  The DOE and ASHRAE have adopted legislation that calls for a 20% energy reduction in existing facilities and 30% reduction in new construction by 2020.  The reduction of supply air reheat is a target for reducing the building energy use.  ANSI/ASHRAE Standard 170-2008 Ventilation of Healthcare Facilities establishes regulations for ventilation rates and practices.  This       Standard has also been adopted by ASHRAE.  The Standard stipulates ventilation and exhaust rates and strategies for the various areas within these facilities.

 

ASHRAE recently published Addendum H to the Standard which revises the ventilation requirements for spaces within   healthcare facilities where recirculation of room air is allowable.  In general, these areas include diagnostic and treatment rooms, general patient nursing rooms and labor/delivery and post partum areas.  Previous to the addendum, these areas    required that 6 air changes per hour of conditioned and filtered air be delivered to each space, two of which were outdoor air.

 

Addendum H revises the Standard to allow re-circulation of room air to count toward the 6 total air changes, provided:

1. Re-circulation is acceptable in the type of space under construction.

2. The re-circulation is limited to the room itself and does not include any air from another space.

3. Delivery of a minimum of two air changes (per hour) of outside air (filtered through MEERV 13 filter before entering space) is maintained.

 

In addition, Addendum H stipulates that no filtering of the re-circulation air is required provided it does not pass across a wet coil surface.  The addendum is clearly written to promote the use of chilled beams in these areas in order to reduce the amount of supply air reheat.