Simplified Simulation Models for DOAS with CRCPs2003 ASHRAE Annual Meeting Kansas City
Energy Conservation Benefits of a DOAS with Parallel Sensible Cooling by Ceiling Radiant Panels
Jae-Weon Jeong
Department of Architectural Engineering
The Pennsylvania State University
Presentation Outline
Research background
2003 ASHRAE Annual Meeting Kansas City
Problems of All-Air VAV
Multiple spaces equation (ASHRAE Std. 62)
Does not guarantee that individual space will always receive the intended OA quantity
Conditioning and transporting air
Part load humidity problem
2003 ASHRAE Annual Meeting Kansas City
DOAS with Parallel Cooling
Pilot DOAS/CRCP system
3200 ft2 studio (43’ X 74’)
14’ ceiling height with 8 rows of pendent illumination at the 9-ft plane
40 students
Pilot System Configuration
Enthalpy Wheel
8 rows,
System Operating Stages
Maintain Space DPT
Panel Pump
is activated
EW and C/C controls
Energy Simulation
Simulated the pilot system and a VAV serving the same space
For DOAS/CRCP pilot system simulation
General purpose equation solving software
General reciprocating air-cooled chiller model
Quasi-steady CRCP model
2003 ASHRAE Annual Meeting Kansas City
Energy Simulation
Commercial energy analysis program was used
For common base simulation
Identical chiller part-load characteristic
Identical weather data (Williamsport, PA) were used
2003 ASHRAE Annual Meeting Kansas City
Cooling Coil Load
to the EW
2003 ASHRAE Annual Meeting Kansas City
Chiller Energy Reduction
Annual Chiller Energy Consumption
DOAS/CRCP pilot system: 7.9 MWh/y (4.5 seasonal COP)
29% reduction
25% reduction
Fan and Pumping Energy
VAV – 3220 scfm
VAV – 7.97 MWh/y
Counterbalanced by the greatly reduced fan and chiller energy
37% of VAV
Total Energy Consumption
Conclusions
Increased pumping energy
Offset by reduced fan & chiller energy consumption
Real operation data of the pilot DOAS/CRCP system pending ASHRAE & DOE funding
Questions?