ASHRAE Journal - March 2015 - 32

TECHNICAL FEATURE

project location should point out where to recommend
increased product performance.
Operating hours will also impact savings. For this analysis, the assumption was 24/7 operation. In many applications, the MUA unit may only see 30% to 50% operating
hours, which will cut the annual savings and prolong the
payback period.
There are other things that can be done to reduce
energy usage including:
* Reducing operating time (don't run it unless you
have to).
* Considering demand control ventilation or some
other means of reducing the supply airflow when possible. This improves the value of the direct drive plenum
fans with VFDs.
* Use low leakage outdoor air dampers to reduce
infiltration when the unit is off. In very cold climates
consider insulated low leak dampers.
* Consider face and bypass DX coil arrangements to reduce the condensing unit size (this requires expanding the
RH comfort criteria). This will cut the cooling load in half

reducing the first cost and operating cost. It will also avoid
the need for any reheat; however, dehumidification will be
reduced. In many applications this may be acceptable.
* Evaporative cooling (depending on location).
* Single air path (reheat) or dual air path energy
recovery. A dual air path energy recovery unit can offer
substantial savings however at a higher first cost for
both the unit and the return air ducting work. ASHRAE
Standard 90.1 has requirements for exhaust air energy
recovery depending on location and application. The
proposed energy savings outlined in this article would
also apply to an energy recovery MUA unit.

References
1. ANSI Z83.8/CSA 2.6 -2013, Standard for Gas Unit Heaters, Gas Packaged Heaters, Gas Utility Heaters and Gas-Fired Duct Furnaces.
2. ANSI/ASHRAE/IES Standard 90.1 -2013, Energy Standard For
Buildings Except Low-Rise Residential Buildings.
3. Natural Gas and Electricity rates are based 2013 U.S. Energy
Information Administration.
4. ANSI/ASHRAE/USGBC/IES Standard 189.1 -2009, Standard for
the Design of High Performance Green Buildings. Table 7.5.3.
5. Crowther, H. 2014. "Air Leakage in Air Handling Units." Price
Industries White Paper.

www.info.hotims.com/54426-49

32

ASHRAE JOURNAL

ashrae.org

MARCH 2015



ASHRAE Journal - March 2015

Table of Contents for the Digital Edition of ASHRAE Journal - March 2015

Contents
ASHRAE Journal - March 2015 - Intro
ASHRAE Journal - March 2015 - Cover1
ASHRAE Journal - March 2015 - Cover2
ASHRAE Journal - March 2015 - 1
ASHRAE Journal - March 2015 - 2
ASHRAE Journal - March 2015 - Contents
ASHRAE Journal - March 2015 - 4
ASHRAE Journal - March 2015 - 5
ASHRAE Journal - March 2015 - 6
ASHRAE Journal - March 2015 - 7
ASHRAE Journal - March 2015 - 8
ASHRAE Journal - March 2015 - 9
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ASHRAE Journal - March 2015 - 13
ASHRAE Journal - March 2015 - 14
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ASHRAE Journal - March 2015 - 17
ASHRAE Journal - March 2015 - 18
ASHRAE Journal - March 2015 - 19
ASHRAE Journal - March 2015 - 20
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ASHRAE Journal - March 2015 - 31
ASHRAE Journal - March 2015 - 32
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ASHRAE Journal - March 2015 - 34
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ASHRAE Journal - March 2015 - 36
ASHRAE Journal - March 2015 - 37
ASHRAE Journal - March 2015 - 38
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ASHRAE Journal - March 2015 - 49
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ASHRAE Journal - March 2015 - Cover3
ASHRAE Journal - March 2015 - Cover4
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