Retrotec USACE - Manual (Page 384)

J8 ENERGY & PROCESS ASSESSMENT PROTOCOL
72% 30400 108160 25%
64% 81250 227500 50%
56% 148330 340795 75%
52% 219240 460013 100%
HEDS %
energy
savings
High efficiency dehumidification
system (HEDS)
chiller plant load + reheat
energy (BTUH)
Normal AHU system
chiller plant load + reheat
energy (BTUH) % design CFM
55 68.1 63 75 25%
55 67.2 64 76 50%
55 65.7 64.5 77 75%
55 65.1 65 78 100%
Dew point DB WB DB % design CFM
Leaving conditions Entering conditions
Normal HVAC vs. HEDS
TABLE J1. VARIABLE VOLUME SYSTEM PERFORMANCE COMPARISON
28% 1126150 1561813 45°F
HEDS %
energy
savings
High efficiency dehumidification
system (HEDS-DOAS)
chiller plant load + DX
subcooling + reheat energy
(BTUH)
Chiller plant load + DX
subcooling + reheat energy
(BTUH)
CHWS
temperature
at unit
45 65 82 98 45°F
Dew point DB WB DB
CHWS
temperature
at unit
Leaving conditions Entering conditions
Normal DOAS vs. HEDS-DOAS
TABLE J2. DEDICATED OUTDOOR AIR SYSTEM (DOAS) PERFORMANCE COMPARISON
High efficiency dehumidification system : Energy savings @ 100% Reheat to 65 F/68 F
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1 2 3 4
Percent of design airflow Percent of cooling and reheat energy saved
Figure J7. High Effi ciency Dehumidifi cation System: Energy Savings Vs. Design Air Flow @ 100%
reheat to 65F/68F – Typical for DOAS used for barracks, labs, manufacturing facilities, etc.