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23
RG SERIES ENGINEERING GUIDE
Hot Gas Reheat Dehumidifi cation Overview
Hot Gas Reheat Dehumidification Overview
Dehumidification - The Need for Reheat
With tighter construction and more and more ventilation air
being introduced into buildings, there is more need now than
ever for proper humidity control. Ensuring dehumidification
can provide consistent employee comfort, a reduction in mold
liability, a reduction in cooling costs. Reduced humidity also
provides an improvement in indoor air quality (IAQ) thru lower
humidity levels which can reduce allergen levels, inhibit mold and
bacterial growth, and provide an improved computer environment.
ASHRAE 90.1 speaks of an acceptable humidity range in all
commercial buildings.
Typical Reheat Applications
Reheat can be used wherever moisture is a problem. Schools,
high latent auditorium and theaters, makeup air units*, and
computer rooms are typical applications. Although reheat equipped
water source heat pumps (wshp’s) can condition limited amounts
of outdoor air, the percentage of this outdoor air should never
exceed 50% of the return air to the unit limiting the mixed return
air temperature to a minimum of 50°F. When cold entering air
conditions are anticipated, hot gas bypass option should be
considered to prevent air coil freeze up.
*A dedicated outdoor air system (DOAS) should be investigated for
100% outdoor air applications.
The Design of Reheat Equipment
Hot gas reheat can help maintain specific humidity levels and
neutral air in a building. ASHRAE recommends a relative humidity
range of 30-60% with levels greater than 65% making mold growth
a possibility. The dehumidification relative humidity set points of
57% (on) and 52% (off) are recommended. During reheat the
leaving air temperature (LAT) will approximate neutral air. The
included chart (Leaving Air Temperature vs. Entering Water and Air
Conditions Chart) shows the LAT vs entering water temperature
(EWT) to the unit at differing entering air conditions. At 86-90°F
EWT the unit will provide nearly neutral air.
Moisture Removal Capacity
The amount of moisture removal may be calculated by subtracting
the sensible cooling capacity from the total cooling capacity in
the equipment performance data of the specifications catalog or
submittal data. An example is shown below:
Model RG*048, 1275 cfm, 12 gpm, 90°F EWT
TC – SC = LC
46.5 – 34.6 MBtu/h = 11.9 MBtu/h
Where TC = total cooling capacity, SC=sensible capacity, LC=latent capacity
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Leaving Air Temperature vs. Entering Water and Air Conditions Chart
- RG Series 1
- Table of Contents 3
- Model Nomenclature 4
- AHRI Data 5
- AHRI Data cont 6
- The RG Series 7
- The RG Series cont 10
- Inside the RG Series 12
- Inside the RG Series cont 13
- Aurora ‘Base’ Control 15
- Control Features 15
- Other Control Features 15
- Safety Features 16
- Operation Description 17
- ABC Control Board Layout 18
- Controls - FX10 (optional) 19
- Sequence of Operation 20
- Heating Cycle 21
- Cooling Cycle 21
- Hot Gas Reheat/Hot Gas Bypass 22
- Typical Reheat Applications 23
- Moisture Removal Capacity 23
- Overview cont 24
- Hot Gas Reheat - Controls 25
- Application Notes 26
- Application Notes cont 27
- Water Quality 28
- Installation Notes 29
- Installation Notes cont 30
- Vertical Dimensional Data 32
- RG SERIES ENGINEERING GUIDE 33
- Horizontal Dimensional Data 34
- Horizontal Disconnect 35
- Hanger Bracket Locations 36
- Physical Data 37
- Electrical Availability 38
- Electrical Data 39
- Electrical Data cont 40
- Blower Performance Data 42
- Blower Performance Data cont 43
- Selection Example 46
- Selection Example cont 47
- Reference Calculations 48
- Legend and Notes 48
- Operating Limits 49
- Correction Factors 49
- Pressure Drop 50
- RGS009 - Performance Data 51
- RGS012 - Performance Data 52
- RGS015 - Performance Data 53
- RGS018 - Performance Data 54
- RGS023 - Performance Data 55
- RGS024 - Performance Data 56
- RGS030 - Performance Data 57
- RGS036 - Performance Data 58
- RGS041 - Performance Data 59
- RGS042 - Performance Data 60
- RGS048 - Performance Data 61
- RGS060 - Performance Data 62
- RGS070 - Performance Data 63
- Wiring Schematics 75
- Wiring Schematics cont 76
- Casing and Cabinet 81
- Refrigerant Circuit 81
- Blower Motor and Assembly 82
- Electrical 82
- Hanger Kit 83
- Accessories 83
- Revision Guide 84
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