ASHRAE Journal - September 2010 - 68

passes on to the perimeter portion of the Parameter Interior Perimeter plenum. The reverse series represents a Room Height, ft 9 9 configuration where the supply air first enters the perimeter zone (by ductwork Floor Area, ft2 3,500 1,500 or shaft location) before entering the Floor Level Middle Floor Middle Floor interior zone. Linear Bar Grille The other two plenum options inDiffuser Type Swirl (48 in.) clude: common (the open plenum is assumed to be well-mixed and delivers Number of Diffusers 20 14 the same average diffuser discharge 2 9 24 temperature to both interior and perim- Design Cooling Load Calculated for a Mixing System, Btu/h·ft eter zones); and independent (the pleDesign Average Temperature in the Occupied Zone, °F 75 75 num is assumed to be subdivided into separate interior and perimeter zones, 0.05 0.05 Estimated Category 2 Leakage, cfm/ft2 each supplied with its own selectable Setpoint Temperature of Air Entering Supply Plenum, °F 63 n/a supply air temperature). The design tool predicts the room air Number of Occupants 20 n/a temperature profile based on the fraction Zone Orientation n/a South of the cooling load assigned to the room, room setpoint temperature, the type and Length of the External Wall of the Perimeter Zone, ft n/a 100 number of diffusers, diffuser discharge temperature, and calculated airflow rate. Table 1: Design input parameters for the modeled UFAD system (series plenum). The simplified stratification models have 100 ft been previously described for interior 2 and new correlations for perimzones eter zones have been added based on Interior Zone full-scale laboratory testing.12 Three of the most common floor diffuser types are 35 ft modeled in the tool: Swirl Diffusers 50 ft • Interior swirl diffuser; • Interior and perimeter square VAV directional diffuser that automatically varies the ratio of time between Fan Coil Units Perimeter Zone Linear Bar Grilles when the diffuser is fully open versus 15 ft when it is fully closed; and • Perimeter linear bar grille. The design tool also accounts for the Figure 4: Floor plan for design tool example showing diffusers and underfloor fan coil units. cooling contribution of Category 2 air leakage (leakage from plenum to room), for which the user can bar grilles in the perimeter (number of diffusers will vary for input an estimated value. different cases described below). The design tool is suitable for application to typical ofFigure 5 presents the temperature profiles for the two zones fice and commercial building construction with 4 in. to 8 in. being considered as generated by the design tool. The profiles (0.1 m to 0.2 m) thick uninsulated structural slabs, raised also graphically represent the amount of temperature gain access floor with carpeting, and ASHRAE/IESNA Standard (thermal decay) within the plenum. Note that for the series con90.1-2004 compliant building envelope. In its current form, figuration, the air from the air handler enters the interior zone the tool allows only one type of diffuser per zone. The tool plenum at 63°F (17.2°C), where it warms up to 66.5°F (19.2°C). has not been verified for use with high-ceiling spaces (e.g., This warmer air is delivered into the interior zone (room) and auditoriums, theaters). also into the perimeter portion of the plenum, where it gains additional heat up to 69.8°F (21°C). The predicted room air Design Tool Example temperature profiles allow the following parameters to be easTo demonstrate the capabilities of the UFAD design tool, ily determined: (1) average occupied zone temperature setpoint an example of a 5,000 ft2 (464 m2) office space is presented. equals 75°F (24°C); (2) vertical temperature difference between The design input parameters are summarized in Table 1 for a head and ankle heights for comparison with the maximum acseries plenum. Figure 4 shows a plan view indicating that air is ceptable limit of 5.4°F (3°C) specified by ASHRAE Standard delivered through swirl diffusers in the interior zone and linear 55-2010; and (3) temperature at the standard thermostat height
68	 ASHRAE	Journal	 ashrae.org	 	 September	 2010



ASHRAE Journal - September 2010

Table of Contents for the Digital Edition of ASHRAE Journal - September 2010

ASHRAE Journal - September 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Doored Display Cases: They Save Energy, Don't Lose Sales
Energy Storage: Providing for a Low-Carbon Future
Specifying Insulation for Air Terminal Units
Stem Cell Lab
Horticultural Lab
Fume Hood Retrofit
Cooling Load Design Tool for UFAD
AHR Expo Mexico 2010 Show Guide
Emerging Technologies
Building Sciences
Solar Applications
Operations & Maintenance
Washington Report
People
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - September 2010 - Intro
ASHRAE Journal - September 2010 - ASHRAE Journal - September 2010
ASHRAE Journal - September 2010 - Cover2
ASHRAE Journal - September 2010 - 1
ASHRAE Journal - September 2010 - 2
ASHRAE Journal - September 2010 - Contents
ASHRAE Journal - September 2010 - Commentary
ASHRAE Journal - September 2010 - 5
ASHRAE Journal - September 2010 - Industry News
ASHRAE Journal - September 2010 - 7
ASHRAE Journal - September 2010 - 8
ASHRAE Journal - September 2010 - 9
ASHRAE Journal - September 2010 - Letters
ASHRAE Journal - September 2010 - 11
ASHRAE Journal - September 2010 - 12
ASHRAE Journal - September 2010 - 13
ASHRAE Journal - September 2010 - 14
ASHRAE Journal - September 2010 - 15
ASHRAE Journal - September 2010 - Meetings and Shows
ASHRAE Journal - September 2010 - 17
ASHRAE Journal - September 2010 - Doored Display Cases: They Save Energy, Don't Lose Sales
ASHRAE Journal - September 2010 - 19
ASHRAE Journal - September 2010 - 20
ASHRAE Journal - September 2010 - 21
ASHRAE Journal - September 2010 - 22
ASHRAE Journal - September 2010 - 23
ASHRAE Journal - September 2010 - 24
ASHRAE Journal - September 2010 - 25
ASHRAE Journal - September 2010 - 26
ASHRAE Journal - September 2010 - 27
ASHRAE Journal - September 2010 - Energy Storage: Providing for a Low-Carbon Future
ASHRAE Journal - September 2010 - 29
ASHRAE Journal - September 2010 - 30
ASHRAE Journal - September 2010 - 31
ASHRAE Journal - September 2010 - 32
ASHRAE Journal - September 2010 - 33
ASHRAE Journal - September 2010 - 34
ASHRAE Journal - September 2010 - 35
ASHRAE Journal - September 2010 - 36
ASHRAE Journal - September 2010 - 37
ASHRAE Journal - September 2010 - Specifying Insulation for Air Terminal Units
ASHRAE Journal - September 2010 - 39
ASHRAE Journal - September 2010 - 40
ASHRAE Journal - September 2010 - 41
ASHRAE Journal - September 2010 - 42
ASHRAE Journal - September 2010 - 43
ASHRAE Journal - September 2010 - Stem Cell Lab
ASHRAE Journal - September 2010 - 45
ASHRAE Journal - September 2010 - 46
ASHRAE Journal - September 2010 - 47
ASHRAE Journal - September 2010 - 48
ASHRAE Journal - September 2010 - 49
ASHRAE Journal - September 2010 - Horticultural Lab
ASHRAE Journal - September 2010 - 51
ASHRAE Journal - September 2010 - 52
ASHRAE Journal - September 2010 - 53
ASHRAE Journal - September 2010 - 54
ASHRAE Journal - September 2010 - 55
ASHRAE Journal - September 2010 - Fume Hood Retrofit
ASHRAE Journal - September 2010 - 57
ASHRAE Journal - September 2010 - 58
ASHRAE Journal - September 2010 - 59
ASHRAE Journal - September 2010 - 60
ASHRAE Journal - September 2010 - 61
ASHRAE Journal - September 2010 - Cooling Load Design Tool for UFAD
ASHRAE Journal - September 2010 - 63
ASHRAE Journal - September 2010 - 64
ASHRAE Journal - September 2010 - 65
ASHRAE Journal - September 2010 - 66
ASHRAE Journal - September 2010 - 67
ASHRAE Journal - September 2010 - 68
ASHRAE Journal - September 2010 - 69
ASHRAE Journal - September 2010 - 70
ASHRAE Journal - September 2010 - 71
ASHRAE Journal - September 2010 - 72
ASHRAE Journal - September 2010 - AHR Expo Mexico 2010 Show Guide
ASHRAE Journal - September 2010 - S2
ASHRAE Journal - September 2010 - S3
ASHRAE Journal - September 2010 - S4
ASHRAE Journal - September 2010 - S5
ASHRAE Journal - September 2010 - S6
ASHRAE Journal - September 2010 - S7
ASHRAE Journal - September 2010 - S8
ASHRAE Journal - September 2010 - S9
ASHRAE Journal - September 2010 - S10
ASHRAE Journal - September 2010 - S11
ASHRAE Journal - September 2010 - S12
ASHRAE Journal - September 2010 - S13
ASHRAE Journal - September 2010 - S14
ASHRAE Journal - September 2010 - S15
ASHRAE Journal - September 2010 - S16
ASHRAE Journal - September 2010 - S17
ASHRAE Journal - September 2010 - S18
ASHRAE Journal - September 2010 - S19
ASHRAE Journal - September 2010 - S20
ASHRAE Journal - September 2010 - S21
ASHRAE Journal - September 2010 - S22
ASHRAE Journal - September 2010 - S23
ASHRAE Journal - September 2010 - S24
ASHRAE Journal - September 2010 - S25
ASHRAE Journal - September 2010 - S26
ASHRAE Journal - September 2010 - S27
ASHRAE Journal - September 2010 - S28
ASHRAE Journal - September 2010 - S29
ASHRAE Journal - September 2010 - S30
ASHRAE Journal - September 2010 - S31
ASHRAE Journal - September 2010 - S32
ASHRAE Journal - September 2010 - Emerging Technologies
ASHRAE Journal - September 2010 - 74
ASHRAE Journal - September 2010 - 75
ASHRAE Journal - September 2010 - 76
ASHRAE Journal - September 2010 - 77
ASHRAE Journal - September 2010 - Building Sciences
ASHRAE Journal - September 2010 - 79
ASHRAE Journal - September 2010 - 80
ASHRAE Journal - September 2010 - 81
ASHRAE Journal - September 2010 - 82
ASHRAE Journal - September 2010 - 83
ASHRAE Journal - September 2010 - 84
ASHRAE Journal - September 2010 - 85
ASHRAE Journal - September 2010 - 86
ASHRAE Journal - September 2010 - 87
ASHRAE Journal - September 2010 - Solar Applications
ASHRAE Journal - September 2010 - 89
ASHRAE Journal - September 2010 - 90
ASHRAE Journal - September 2010 - 91
ASHRAE Journal - September 2010 - Operations & Maintenance
ASHRAE Journal - September 2010 - 93
ASHRAE Journal - September 2010 - Washington Report
ASHRAE Journal - September 2010 - 95
ASHRAE Journal - September 2010 - People
ASHRAE Journal - September 2010 - Products
ASHRAE Journal - September 2010 - 98
ASHRAE Journal - September 2010 - 99
ASHRAE Journal - September 2010 - 100
ASHRAE Journal - September 2010 - 101
ASHRAE Journal - September 2010 - Classified Advertising
ASHRAE Journal - September 2010 - 103
ASHRAE Journal - September 2010 - Advertisers Index
ASHRAE Journal - September 2010 - Cover3
ASHRAE Journal - September 2010 - Cover4
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