Energy Performance Analysis of Coupled Control Units With Both Thermostat and Humidistat

2001 ◽  
Author(s):  
Mingsheng Liu ◽  
Jinrong Wang
Keyword(s):  
Computer Simulation ◽  
Thermal Energy ◽  
Control Unit ◽  
Simulation Models ◽  
Energy Performance ◽  
Variable Air Volume ◽  
Air Volume ◽  
Control Units ◽  
Simulation Results ◽  
Computer Simulation Models

Abstract The coupled control unit is widely used in hotels, dormitory buildings, hospitals, and office buildings. Computer simulation models are developed to analyze the thermal energy performance of the coupled control units. Simulation results indicate that excessive airflow significantly increases thermal and fan power consumption. The variable air volume technique or the return air by-pass can be used to improve the energy performance of the coupled control units. The humidistat should be properly set and located to avoid excessive thermal energy consumption.

System Performance Analysis of Overlap Coupled Control Units

2001 ◽  
Author(s):  
Mingsheng Liu ◽  
Jinrong Wang
Keyword(s):  
Energy Consumption ◽  
Peak Load ◽  
Control Unit ◽  
Simulation Models ◽  
Energy Performance ◽  
Energy Simulation ◽  
Variable Air Volume ◽  
System Parameters ◽  
Air Volume ◽  
Control Units

Abstract The overlap coupled control unit is widely used in hotels, dormitory buildings, hospitals, and office buildings. Energy simulation models are developed to assess changes in energy consumption and humidity levels due to changes in various system parameters. The simulation results show that the energy consumption of the overlap unit is 3 to 5 times higher than the optimal energy consumption. To improve the energy performance, the following measures are recommended: (1) use the variable air volume technique; (2) balance total airflow based on actual peak load; and (3) replace overlap with humidistat. Quick open valves are also found to improve relative humidity control.

Energy Performance Analysis of Coupled-Control Units With Both Thermostat and Humidistat

2005 ◽  
Vol 127 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Mingsheng Liu ◽  
Jinrong Wang
Keyword(s):  
Energy Consumption ◽  
Relative Humidity ◽  
Thermal Energy ◽  
Simulation Models ◽  
Energy Performance ◽  
Set Point ◽  
Control Units ◽  
Improvement Measures ◽  
Potential Improvement ◽  
Cooling Coil

Coupled control units typically condition a single zone with constant air volume. A thermostat controls the heating valve or cooling valve when the room relative humidity is below the set point. When the room relative humidity is higher than the set point, a humidistat controls the cooling coil to dehumidify air and the thermostat controls the heating coil to maintain room temperature. Theoretical modeling is performed to investigate the energy performance of coupled control units and potential improvement measures. The study shows that the annual thermal energy consumption of the coupled-control units is up to four times higher than the optimal thermal energy consumption. Thermal energy consumption can be reduced by (a) eliminating excessive airflows, (b) minimizing valve leakages, and (c) modulating airflows with a zone sensible load. This paper presents the simulation models and results and discusses improvement measures.

Laboratory study and computer model development related to gross solids' movement in combined sewers

1996 ◽  
Vol 33 (9) ◽  
pp. 39-47 ◽  
Author(s):  
John W. Davies ◽  
Yanli Xu ◽  
David Butler
Keyword(s):  
Computer Simulation ◽  
Pipe Flow ◽  
Model Development ◽  
Simulation Models ◽  
Laboratory Studies ◽  
Pilot Model ◽  
Sewer Systems ◽  
Flow Quality ◽  
Computer Simulation Models ◽  
Theoretical Considerations

Significant problems in sewer systems are caused by gross solids, and there is a strong case for their inclusion in computer simulation models of sewer flow quality. The paper describes a project which considered methods of modelling the movement of gross solids in combined sewers. Laboratory studies provided information on advection and deposition of typical gross solids in part-full pipe flow. Theoretical considerations identified aspects of models for gross solids that should differ from those for dissolved and fine suspended pollutants. The proposed methods for gross solids were incorporated in a pilot model, and their effects on simple simulations were considered.

scholarly journals Investigating molecular mechanisms of ageing cartilage using computer simulation models

2014 ◽  
Vol 22 ◽  
pp. S57-S58
Author(s):  
W. Hui ◽  
D.A. Young ◽  
A.D. Rowan ◽  
T.E. Cawston ◽  
C.J. Proctor
Keyword(s):  
Computer Simulation ◽  
Molecular Mechanisms ◽  
Simulation Models ◽  
Computer Simulation Models
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