ASHRAE Journal - April 2009 - 24

45 2,200 2,000 1,800 1,600 1,200 1,000 800 600 400 200 0 0 4 8 12 Time (h) Gain from Solar Radiation Gain from Nonsolar Radiation Gain to Cavity Gain from LW Radiation Total Gain to Room 16 20 24 20 0 4 Outside 8 12 Time (h) Outside Glass Surface Room Cavity Exhaust 16 20 24 Temperature (°C) Gain (W) 1,400 35 Gains Without Blinds 40 30 25 Outer Surface of the Inner Glazing Unit 2,200 2,000 1,800 1,600 1,400 Gain (W) 1,200 1,000 800 600 400 200 0 0 4 8 12 Time (h) 16 20 24 1,200 1,000 Power (W) 800 600 400 200 1,600 1,400 Gains With Blinds Inner Surface of the Inner Glazing Unit Figure 7: Diurnal variation of average air and surface temperatures in Pearl River Tower DSF south-facing façade without shading devices. 1,800 Gain from Solar Radiation Gain from Nonsolar Radiation Gain to Cavity Gain from LW Radiation Total Gain to Room Figure 6: Pearl River Tower DSF predicted performance with and without blinds for the south-facing façade. 0 0 10 Gain to Room 20 30 Flow Rate (m3/h·m) Load to Room 40 50 Gain to Cavity 60 a cost-benefit analysis to determine at which point the reduction in gain entering the room is offset by the additional fan energy driving the air through the cavity and the increased energy within the cavity air. A holistic approach to building design is required. Figure 9 shows a sample prediction from a CFD simulation of short-wave radiation, air speed, and air temperature distributions in a Pearl River Tower DSF cavity. In this simulation, the blinds were explicitly modeled for solar control. The graphics illustrate the complex patterns that simpler analytic models must account for, or risk providing the incorrect feedback. The vertical stratification of hot air in the cavity will increase heat flow into the building at the top of this single story cavity and the surface temperatures that will affect the long-wave radiant field in the occupied space. Multifloor cavities can exhibit 24 ASHRAE Journal Figure 8: Predicted effects of cavity airflow rate on energy flows. This was an early design configuration of the south-facing façade for Pearl River without shading devices. more pronounced vertical variations in temperature leading to increased gains at the upper levels of the cavities. Comparison of DSF to a High Performance Single Façade Figure 10 shows predicted maximum monthly gains and loads into a room through both a single and double skin façade configuration (quoted as W/m of width of the façade). These are compared without shading devices for an east-facing façade of a building located at 40º N (Beijing). This analysis was carashrae.org April 2009

ASHRAE Journal - April 2009

Table of Contents for the Digital Edition of ASHRAE Journal - April 2009

ASHRAE Journal - April 2009
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
    Ventilating Façades
    Dissimilar Metals in Heating and AC Piping Systems
    Anniversary Feature: Central Chilled Water Distribution Systems Design
    Total Cost of Ownership for Air-Cooled and Water-Cooled Chiller Systems
    Controlling Air Leakage in Tall Buildings
Building Sciences
Emerging Technologies
Washington Report
Special Products
People
Products
Classified Advertising
Advertising Index
ASHRAE Journal - April 2009 - ASHRAE Journal - April 2009
ASHRAE Journal - April 2009 - Cover2
ASHRAE Journal - April 2009 - 1
ASHRAE Journal - April 2009 - 2
ASHRAE Journal - April 2009 - Contents
ASHRAE Journal - April 2009 - 4
ASHRAE Journal - April 2009 - Commentary
ASHRAE Journal - April 2009 - 6
ASHRAE Journal - April 2009 - Industry News
ASHRAE Journal - April 2009 - 8
ASHRAE Journal - April 2009 - 9
ASHRAE Journal - April 2009 - 10
ASHRAE Journal - April 2009 - 11
ASHRAE Journal - April 2009 - 12
ASHRAE Journal - April 2009 - Letters
ASHRAE Journal - April 2009 - Meetings and Shows
ASHRAE Journal - April 2009 - 15
ASHRAE Journal - April 2009 -     Ventilating Façades
ASHRAE Journal - April 2009 - 17
ASHRAE Journal - April 2009 - 18
ASHRAE Journal - April 2009 - 19
ASHRAE Journal - April 2009 - 20
ASHRAE Journal - April 2009 - 21
ASHRAE Journal - April 2009 - 22
ASHRAE Journal - April 2009 - 23
ASHRAE Journal - April 2009 - 24
ASHRAE Journal - April 2009 - 25
ASHRAE Journal - April 2009 - 26
ASHRAE Journal - April 2009 - 27
ASHRAE Journal - April 2009 -     Dissimilar Metals in Heating and AC Piping Systems
ASHRAE Journal - April 2009 - 29
ASHRAE Journal - April 2009 - 30
ASHRAE Journal - April 2009 - 31
ASHRAE Journal - April 2009 - 32
ASHRAE Journal - April 2009 - 32A
ASHRAE Journal - April 2009 - 32B
ASHRAE Journal - April 2009 - 32C
ASHRAE Journal - April 2009 - 32D
ASHRAE Journal - April 2009 -     Anniversary Feature: Central Chilled Water Distribution Systems Design
ASHRAE Journal - April 2009 - 34
ASHRAE Journal - April 2009 - 35
ASHRAE Journal - April 2009 - 36
ASHRAE Journal - April 2009 - 37
ASHRAE Journal - April 2009 - 38
ASHRAE Journal - April 2009 - 39
ASHRAE Journal - April 2009 - 40
ASHRAE Journal - April 2009 - 41
ASHRAE Journal - April 2009 -     Total Cost of Ownership for Air-Cooled and Water-Cooled Chiller Systems
ASHRAE Journal - April 2009 - 43
ASHRAE Journal - April 2009 - 44
ASHRAE Journal - April 2009 - 45
ASHRAE Journal - April 2009 - 46
ASHRAE Journal - April 2009 - 47
ASHRAE Journal - April 2009 - 48
ASHRAE Journal - April 2009 - 48A
ASHRAE Journal - April 2009 - 48B
ASHRAE Journal - April 2009 - 49
ASHRAE Journal - April 2009 -     Controlling Air Leakage in Tall Buildings
ASHRAE Journal - April 2009 - 51
ASHRAE Journal - April 2009 - 52
ASHRAE Journal - April 2009 - 53
ASHRAE Journal - April 2009 - 54
ASHRAE Journal - April 2009 - 55
ASHRAE Journal - April 2009 - 56
ASHRAE Journal - April 2009 - 57
ASHRAE Journal - April 2009 - 58
ASHRAE Journal - April 2009 - 59
ASHRAE Journal - April 2009 - 60
ASHRAE Journal - April 2009 - 61
ASHRAE Journal - April 2009 - Building Sciences
ASHRAE Journal - April 2009 - 63
ASHRAE Journal - April 2009 - 64
ASHRAE Journal - April 2009 - 65
ASHRAE Journal - April 2009 - 66
ASHRAE Journal - April 2009 - 67
ASHRAE Journal - April 2009 - Emerging Technologies
ASHRAE Journal - April 2009 - 69
ASHRAE Journal - April 2009 - 70
ASHRAE Journal - April 2009 - Washington Report
ASHRAE Journal - April 2009 - Special Products
ASHRAE Journal - April 2009 - 73
ASHRAE Journal - April 2009 - People
ASHRAE Journal - April 2009 - Products
ASHRAE Journal - April 2009 - 76
ASHRAE Journal - April 2009 - Classified Advertising
ASHRAE Journal - April 2009 - 78
ASHRAE Journal - April 2009 - 79
ASHRAE Journal - April 2009 - Advertising Index
ASHRAE Journal - April 2009 - Cover3
ASHRAE Journal - April 2009 - Cover4
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