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Element D ServicesHeating, Ventilating, and Air

ConditioningD300102 Laboratory LoadCalculation Criteria

The University of Texas LABORATORY LOAD CALCULATION CRITERIAM. D. Anderson Cancer Center D300102ODG021110 1 OF 4

PART 1 - GENERAL

1.01 OVERVIEW

A. This section supplements Design Guideline Element D3001 with specific requirements forpatient treatment occupancies that the A/E must incorporate when calculating HVAC coolingand heating loads.

B. Load calculations must be performed in accordance with the latest ASHRAE Handbook ofFundamentals.

C. Refer to Design Guideline Element D3001 for general design criteria related to outdoordesign conditions, internal loads, occupant density, occupant heat rejection, buildingenvelope, and system zoning.

PART 2 - DESIGN CRITERIA

2.01 INDOOR DESIGN CONDITIONS

A. The following table applies to Laboratory spaces that are in addition to office spaces, whichare listed in Design Guideline Element D3001.

App licati on Summer Dry Bulb

(F)

Winter Dry

Bulb (F)

Relative

Humidit y (%)

Womens Restroom 74F 2F 68F 2F 30-50

Mens Restroom 74F 2F 68F 2F 30-50Tissue Culture Room 74F 2F 72F 2F 30-50

Cold Room 19F 0.1F 19F 0.1F 30-50

Flex Room 74F 2F 68F 2F 30-50

Chemical Fume Hood Room 74F 2F 68F 2F 30-50

Dark Room 70F 2F 68F 2F 30-50

LN 2 Freezer Room 74F 2F 68F 2F 30-50

Glass Wash Room 74F 2F 68F 2F 30-50

Storage Room 74F 2F 72F 2F 30-50

Equipment Room 80F 5F 55F 5F 25-50

B. It is recognized that occasional excursions beyond the above design conditions will occur

due to a variety of factors, but such excursions should not prevent generally intendedfunction of the space.

C. Humidification for control shall be provided for applications where indicated. Size the steamdelivering capacity of the humidifier to maintain the room at mean 45 percent relativehumidity, at minimum design air temperature of 72 degrees F during winter minimum outsideair temperature conditions. Size the capacity to maintain relative humidity in the space atmean 45 percent at a maximum condition of 74 degrees F.

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D. Coordinate environmental temperature limits and humidity requirements for specialequipment in accordance with manufacturers recommendations.

E. Depending on HVAC system used, it should be recognized that re-heat energy requirementscan result in lower cooling operation setpoints being less costly to operate than highersetpoints.

2.02 INTERNAL LOADS

A. When calculating HVAC system loads for selecting airside equipment, incorporate thefollowing safety margins, unless directed otherwise by Owner during the Schematic Designphase:

1. Use 8 watts per square foot for internal sensible plug power loads.

2. Apply a 20 percent safety factor to sensible and latent Btuh loads for system designcapacity to the chilled water system.

3. Size each chiller at less then 100 percent of total load capacity, which includes a 20percent safety factor, however, each chiller must have sufficient capacity to maintain acontrolled temperature environment for rooms or support spaces identified by Ownersresearch staff as critical to research operations.

2.03 OCCUPANT DENSITY

A. Confirm the number of occupants with the Facility Program or Pre-Design Report as spaceprogramming is finalized.

2.04 OCCUPANT HEAT REJECTION

A. In general, use heat gain rates for occupants listed in ASHRAE Handbook of Fundamentals,Chapter 30.

2.05 VENTILATION LOADS

A. Design Guideline Element D304202 Laboratory Exhaust Ventilation provides air change ratesfor different type of laboratory spaces and support rooms.

B. Different types of Biological Safety Cabinets with their design exhaust rates that affect roomventilation rates are listed within Design Guideline Element D304202.

2.06 SYSTEM ZONING

A. In determining zones for air handling unit service, consider the following:

1. Functional use of the space. For example, tissue culture rooms and chemical fume hoodrooms will require separation of duct distribution systems or air handling systems toprevent the possibility of cross contamination from one controlled space to another.

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2. Discuss proposed air handling unit zoning with Owner prior to proceeding with SchematicDesign.

B. In general, terminal unit zoning will be as follows:

1. Limit maximum zone temperature control per tissue culture room and other supportrooms.

2. Zone areas in accordance with functional use of the space.

PART 3 - SPECIAL CONTRACT DOCUMENT REQUIREMENTS

3.01 GENERAL

A. Unless stated otherwise in these Owners Design Guidelines, the A/E need not submitcalculations or economic analysis for review. Copies must be retained and presentedhowever, to Owner for review upon request.

PART 4 - PRODUCTS

4.01 GENERAL

A. For renovation projects, refer to Owners Master Construction Specifications. These areavailable on the Owners Design Guidelines website:http://www2.mdanderson.org/depts/cpm/standards/specs.html
http://www2.mdanderson.org/depts/cpm/standards/specs.htmlhttp://www2.mdanderson.org/depts/cpm/standards/specs.htmlhttp://www2.mdanderson.org/depts/cpm/standards/specs.html

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PART 5 - DOCUMENT REVISION HISTORY

Issue Date Revision Description Reviser

01-01-07 Initial Adoption of Element

Rev. 1 02-27-07 Revised cold room temperature and humidity per J GCcomment

PDN

Rev. 2 12-09-08 Included sustainability requirements throughout documentbased upon TGCEs evaluation. (Paragraphs 2.01; 2.01 B;2.01 E & 2.04 A; )

J CD

Rev. 3 02-11-10 Added load value of 8 watts per square foot for internal

sensible plug power loads. Paragraph 2.02 A. 1.

PDN

Rev. 4

Rev. 5

END OF ELEMENT D300102

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