ASHRAE Journal - January 2010 - 50

How Much Water Collects At Design Conditions? Figure 1: Conditioning of outside air across a cooling coil. For simplicity, consider the process of a unit conditioning 100% outdoor air (such as with a dedicated outdoor air system or DOAS). The psychrometric chart shown in Figure 1 represents a path of outdoor air as it passes across the cooling coil for the 0.4% cooling design condition in Athens, Ga. Assuming a supply air condition of 55°F (12.8°C) and 85% relative humidity (wet bulb temperature = 52.5°F [11.4°C]), the humidity ratio changes across the coil from 0.0141 to 0.0078 lbwater/lbdry air (kg/kgair). The difference in absolute humidity (ω) between the incoming outdoor air and supply air leaving the unit represents the amount of condensation that occurs. Thus, for every pound of air supplied by the unit, 0.0141 – 0.0078 or 0.0063 lbs (kg) of water are condensed. The total amount of condensate expected is determined by the equation below: min condensate collected = airflow × density × 60 × Dω h Assuming 1,000 cfm (472 L/s) of outdoor air is being conditioned, the total amount of condensate expected would be: humidity of the outdoor and supply air. We will use this to help validate and refine the model for future use and application to other climate regions. How detailed a model and prediction of 50 ASHRAE Journal lb ft3 min × 60 × min 13.133 ft3 h lbwater kg = 28.8 lb (13.1 × (0.0141 – 0.0078) ) lbdry air h h This is approximately 3.5 gallons (13.1 L) per hour at the cooling design condition. Similar calculations can be run for any locality, and the result can vary widely depending on the climate. For example, when the calculation is run for other representative cities that range from hot and humid to dry climate types, the condensate yields are: • Houston (95.1°F [33°C] dry bulb/77.6°F [25°C] MCWB) = 7.0 gallons (26.5 L) per hour • Boston (90.8°F [33°C] dry bulb/73.3°F [23°C] MCWB) = 3.2 gallons (12 L) per hour condensate = 1,000 • Sacramento, Calif. (100.4°F [38°C] dry bulb/70.7°F [22°C] MCWB) = 0.8 gallons (3 L) per hour • Denver (94.3°F [35°C] dry bulb/60.3°F [16°C] MCWB) = no condensate collected at design cooling load water collected is needed depends on the situation. Certainly, if a project requires justification strictly based on short-term economic analysis, then an accurate prediction is probably ashrae.org January 2010

ASHRAE Journal - January 2010

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

ASHRAE Journal - January 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Commissioning High Performance Buildings
Sustainability in Cold Climates
Back to Basics: Duct Design Fundamentals
History of Radiant Heating & Cooling Systems, Part 1
Capturing Condensate by Retrofitting AHUs
Washington Report
Building Sciences
Emerging Technologies
Classified Advertising
Advertisers Index
ASHRAE Journal - January 2010 - Intro
ASHRAE Journal - January 2010 - ASHRAE Journal - January 2010
ASHRAE Journal - January 2010 - Cover2
ASHRAE Journal - January 2010 - 1
ASHRAE Journal - January 2010 - 2
ASHRAE Journal - January 2010 - Contents
ASHRAE Journal - January 2010 - 4
ASHRAE Journal - January 2010 - Commentary
ASHRAE Journal - January 2010 - Industry News
ASHRAE Journal - January 2010 - 7
ASHRAE Journal - January 2010 - 8
ASHRAE Journal - January 2010 - Letters
ASHRAE Journal - January 2010 - Meetings and Shows
ASHRAE Journal - January 2010 - 11
ASHRAE Journal - January 2010 - Commissioning High Performance Buildings
ASHRAE Journal - January 2010 - 13
ASHRAE Journal - January 2010 - 14
ASHRAE Journal - January 2010 - 15
ASHRAE Journal - January 2010 - 16
ASHRAE Journal - January 2010 - 17
ASHRAE Journal - January 2010 - 18
ASHRAE Journal - January 2010 - 19
ASHRAE Journal - January 2010 - Sustainability in Cold Climates
ASHRAE Journal - January 2010 - 21
ASHRAE Journal - January 2010 - 22
ASHRAE Journal - January 2010 - 23
ASHRAE Journal - January 2010 - 24
ASHRAE Journal - January 2010 - 25
ASHRAE Journal - January 2010 - 26
ASHRAE Journal - January 2010 - 27
ASHRAE Journal - January 2010 - 28
ASHRAE Journal - January 2010 - 29
ASHRAE Journal - January 2010 - Back to Basics: Duct Design Fundamentals
ASHRAE Journal - January 2010 - 31
ASHRAE Journal - January 2010 - 32
ASHRAE Journal - January 2010 - ME1
ASHRAE Journal - January 2010 - ME2
ASHRAE Journal - January 2010 - ME3
ASHRAE Journal - January 2010 - ME4
ASHRAE Journal - January 2010 - ME5
ASHRAE Journal - January 2010 - ME6
ASHRAE Journal - January 2010 - ME7
ASHRAE Journal - January 2010 - ME8
ASHRAE Journal - January 2010 - 33
ASHRAE Journal - January 2010 - 34
ASHRAE Journal - January 2010 - 35
ASHRAE Journal - January 2010 - 36
ASHRAE Journal - January 2010 - 37
ASHRAE Journal - January 2010 - 38
ASHRAE Journal - January 2010 - 39
ASHRAE Journal - January 2010 - History of Radiant Heating & Cooling Systems, Part 1
ASHRAE Journal - January 2010 - 41
ASHRAE Journal - January 2010 - 42
ASHRAE Journal - January 2010 - 43
ASHRAE Journal - January 2010 - 44
ASHRAE Journal - January 2010 - 45
ASHRAE Journal - January 2010 - 46
ASHRAE Journal - January 2010 - 47
ASHRAE Journal - January 2010 - Capturing Condensate by Retrofitting AHUs
ASHRAE Journal - January 2010 - 49
ASHRAE Journal - January 2010 - 50
ASHRAE Journal - January 2010 - 51
ASHRAE Journal - January 2010 - 52
ASHRAE Journal - January 2010 - 53
ASHRAE Journal - January 2010 - 54
ASHRAE Journal - January 2010 - 55
ASHRAE Journal - January 2010 - Washington Report
ASHRAE Journal - January 2010 - Building Sciences
ASHRAE Journal - January 2010 - 58
ASHRAE Journal - January 2010 - 59
ASHRAE Journal - January 2010 - 60
ASHRAE Journal - January 2010 - 61
ASHRAE Journal - January 2010 - 62
ASHRAE Journal - January 2010 - 63
ASHRAE Journal - January 2010 - Emerging Technologies
ASHRAE Journal - January 2010 - 65
ASHRAE Journal - January 2010 - 66
ASHRAE Journal - January 2010 - 67
ASHRAE Journal - January 2010 - Classified Advertising
ASHRAE Journal - January 2010 - 69
ASHRAE Journal - January 2010 - 70
ASHRAE Journal - January 2010 - Advertisers Index
ASHRAE Journal - January 2010 - 72
ASHRAE Journal - January 2010 - Cover3
ASHRAE Journal - January 2010 - Cover4
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