CEMP-E
TI 810-10
1 February 1999
CHAPTER 4
APPLICATIONS
4-1. GENERAL. The requirements pertaining to eligibility in this chapter are usually necessary
to comply with the applicable energy budgets. If a customer requests a waiver for eligibility for
air conditioning, obtain a separate request and corresponding justification from the customer to
be concurrently submitted with waiver information specified in chapter 1.
4-2. MIXED OCCUPANCIES. In those cases where a facility will have areas requiring comfort
conditions and areas requiring indoor design conditions that exceed the requirements for
comfort (computer rooms, electronic rooms, etc.), use separate cooling system(s) for the areas
requiring the more stringent conditions, or use system(s) that provide the comfort conditions
with supplemental system(s) that provide required conditioning for the applications served. If,
however, areas requiring comfort conditions require no more than 25 percent of the total cooling
capacity or comprise no more than 100 square meters (1,000 square feet) of total floor space,
the primary air-distribution system may be controlled to meet the more stringent conditions.
Where reheat is required for areas requiring close control, the reheat capacity will be equal to
the total design sensible heat generated within the area served.
4-3. ADMINISTRATIVE AREAS. Generally, administrative areas (including those in facilities
that are not otherwise eligible for air conditioning, such as warehouses, shops, and hangars) will
be air conditioned only in locations where the dry bulb temperature is 26.7 degrees C (80
degrees F) or higher for over 350 hours per year.
4-4. COMPUTER AND ELECTRONIC AREAS.
a. Computer Areas. Deviate from the indoor design conditions required for comfort
conditioning, including temperature and humidity limits, only to the extent required to support the
computers to be housed within the area. Other design considerations include the following:
(1) Where practical, use two or more smaller units to satisfy the required cooling
capacity. This will generally reduce energy consumption at partial cooling loads and will also
increase overall system reliability.
(2) Where an under-floor supply air plenum is used in conjunction with above ceiling
return, base the number and size of outlets in the raised floor to deliver 80 percent of the total
supply air. The remaining 20 percent of the supply air should be routed to the room via cable
cutouts in the raised floor. Specify supply registers suitable for installation in floors on which it is
anticipated that equipment will be moved. Locate ceiling return registers near heat producing
equipment.
b. Electronic Equipment Areas (Communication, Surveillance or Research). Deviate from
indoor design conditions for comfort cooling, including temperature, humidity, and level of
filtration, only to the extent required to support the equipment housed within the area.
4-5. TOILETS, LOCKERS, AND UTILITY CLOSETS. Maintain these areas at a negative
pressure relative to adjacent areas by exhausting air transferred from these adjacent areas to
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