Solar Desalination Using Humidification - Dehumidification Technology
Rating the Dehumidification Performance of...
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Rating the dehumidification performanceof cooling equipmentArmin RuddResidential Building Energy Efficiency Meeting 201022 July 2010; 9:10 am
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Residential Building Energy Efficiency Meeting 201022 July 2010
Where we have been
Demonstrated that there is a certain need for dehumidification separate from cooling in high-performance, low-sensible-gain houses in humid climates.
Worked with builders and manufacturers providing: Stand-alone dehumidifier solutions
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Residential Building Energy Efficiency Meeting 201020 July 2010
Dehumidifier and ventilation duct in interior mechanical closet with louvered door
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Residential Building Energy Efficiency Meeting 201022 July 2010
Where we have been
Demonstrated that there is a certain need for dehumidification separate from cooling in high-performance, low-sensible-gain houses in humid climates.
Worked with builders and manufacturers providing: Stand-alone dehumidifier solutions Dehumidifiers connected to the central space
conditioning system (Aprilaire Whole-house Dehumidifier)
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Residential Building Energy Efficiency Meeting 201020 July 2010
Ducted dehumidifier in conditioned spacewith living space control
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Residential Building Energy Efficiency Meeting 201022 July 2010
Where we have been
Demonstrated that there is a certain need for dehumidification separate from cooling in high-performance, low-sensible-gain houses in humid climates.
Worked with builders and manufacturers providing: Stand-alone dehumidifier solutions Dehumidifiers connected to the central space
conditioning system (Aprilaire Whole-house Dehumidifier)
Supplemental dehumidification integrated into the space conditioning system (AAON heat pump with modulating condenser reheat)
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Residential Building Energy Efficiency Meeting 201022 July 2010
DX heat pump with modulating hot gas condenser reheat for dedicated dehumidification mode
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Residential Building Energy Efficiency Meeting 201022 July 2010
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AAON Heat Pump with modulating condenser reheat testing23-Sep-2008 (JD 266)
RA temp
RA rh
SA temp
Total W-h/min
Dehumidifier mode
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Residential Building Energy Efficiency Meeting 201022 July 2010
Where we are now, and ongoing
Continuing supplemental dehumidification system testing and optimization
Creating a framework in which to better evaluate the performance of a range of cooling and dedicated dehumidification equipment as they are applied to high-performance homes. Developing the engineering criteria for obtaining standardized
extended performance data in testing laboratories Conducting field and laboratory evaluations to validate the
viability of obtaining and utilizing the performance data Working with ASHRAE and AHRI on industry consensus test
method and performance rating standards
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Residential Building Energy Efficiency Meeting 201022 July 2010
Regional ratings may be important
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Residential Building Energy Efficiency Meeting 201022 July 2010
Method of Testing for Rating Residential Dehumidifiers for Moisture Removal Capacity and Moisture Removal Efficiency FORWARD … 1. PURPOSE 1.1. The purpose of this standard is to prescribe test methods for determining the moisture removal capacity and moisture removal efficiency for residential dehumidifiers. 2. SCOPE 2.1 This Standard applies to residential dehumidifying equipment that removes moisture by cooling air below its dew-point. The equipment may consist of one or more separate assemblies located indoors or outdoors. Where more than one separate assembly is used, they shall be designed to be used together. 2.2 For purposes of this standard, residential dehumidifiers provides air dehumidification and may provide additional functions of: air cooling, air heating, air circulation, air filtration, air-to-air heat recovery, and water heating. 3.1 DEFINITIONS
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Residential Building Energy Efficiency Meeting 201022 July 2010
ARI Standard 210/240 test conditions
Table 3. Cooling Mode Test Conditions for Units Having a Single-Speed Compressor and a Fixed-Speed Indoor Fan, a Constant Air Volume Rate Indoor Fan, or No Indoor Fan
Test Description F C F C F C F C
A Test - required (steady, wet coil) 80 26.7 67 19.4 95 35 75.0(1) 23.9(1) B Test - required (steady, wet coil) 80 26.7 67 19.4 82 27.8 65.0(1) 18.3(1) C Test - optional (steady, dry coil) 80 26.7 82 27.8 D Test - optional (cyclic, dry coil) 80 26.7 82 27.8
Notes: (1) The specified test condition only applies if the unit rejects condensate to the outdoor coil.
Cd = degradation coefficient, you want that to be low, default=0.25PLF = part load factor (at 50% load), you want that to be high
PLF = 1 - 0.5(Cd)
SEER = PLF * EER
Air Entering Indoor Unit Dry-Bulb Wet-Bulb Wet-BulbDry-Bulb
Air Entering Outdoor Unit
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Residential Building Energy Efficiency Meeting 201022 July 2010
Humidity control setpoints for testing
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Residential Building Energy Efficiency Meeting 201022 July 2010
Humidity control setpoints for testing
Outdoor IndoorT/RH/Tdp T/RH/Tdp(F/%/F) (F/%/F)
Test 1 95/58/78 80/60/65 cooling design conditions78/55/6175/50/55
Test 2 80/85/75 80/60/65 cooling part-load: summer nights/rainy periods78/55/6175/50/55
Test 3 75/85/70 78/60/63 cooling part-load: spring/fall78/55/6175/50/55
Test 4 65/90/62 72/60/57 no cooling: spring/fall/winter70/52/5268/45/46
Test 5 (opt) 65/55/491 cold climate basement conditions1 Single unit basement dehumdifier condition
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Residential Building Energy Efficiency Meeting 201022 July 2010
Dehumidification equipment test results
Indoor Indoor Indoor Sensible Latent Heat Moisture Moisture Dehum EnergyOutdoor Return Supply Wet-coil Cooling Cooling Added Removal Total Removal Efficiency Efficiency
T/RH/Tdp T/RH/Tdp T/RH/Tdp Airflow Capacity Capacity In Dehum Capacity Power Efficiency1 (MRE) Ratio (DER) Ratio (EER)(F/%/F) (F/%/F) (F/%/F) (cfm) (Btu/h) (Btu/h) (Btu/h) (L/h) (kW) (L/kW-h) (Btu/W-h) (Btu/W-h)
Test 1 95/58/78 80/60/6578/55/6175/50/55
Test 2 80/85/75 80/60/6578/55/6175/50/55
Test 3 75/85/70 78/60/6378/55/6175/50/55
Test 4 65/90/62 72/60/5770/52/5268/45/46
Test 5 (opt) 65/55/49
1 Same as the Energy Factor used for dehumidifiers by Energy Star
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Residential Building Energy Efficiency Meeting 201022 July 2010
Further cost reduction of dehumidifying equipment through design and manufacturing optimization
More buy-in from cooling equipment manufacturers regarding the need for a focus on dehumidification performance
More laboratory and field testing of cooling and dehumidifying equipment to establish better performance maps for simulation models
New performance rating standard (and possibly new method of test) for cooling and dehumidifying equipment to aid in proper humidity control design and equipment selection A Method of Test route with specified test conditions was rebuffed by
ASHRAE A new effort will begin with AHRI to develop an industry consensus
rating standard that will specify more test conditions and test results
Gaps, Barriers, and Future Work