Power Reduction in Air Conditioning by Means of Off-Peak Operation and Coolness Storage

1974 ◽  
Vol 96 (3) ◽  
pp. 165-168
Author(s):  
J. C. Dudley ◽  
S. I. Freedman
Keyword(s):  
Air Conditioning ◽  
Thermodynamic Cycle ◽  
Power Reduction ◽  
Performance Data ◽  
Air Conditioning System ◽  
Evaluation Of Performance ◽  
Chilled Water ◽  
Conventional Systems ◽  
And Storage

An original air-conditioning system was developed which requires considerably less power than conventional systems while providing identical cooling and dehumidification. The 50 percent (depending on application) power reduction is accomplished by off-peak compressor operation and storage of chilled water. The full cooling and dehumidification is accomplished by means of a new thermodynamic cycle involving two evaporators with an intermediate condenser operating with the stored chilled water. The system was built, instrumented, and operated reliably. Evaluation of performance data confirmed the theory and verified the power reduction, cooling, and dehumidification performance calculations.

scholarly journals Simplified Thermal Model and Optimal Control for Chilled Water Pipe in Air-Conditioning System

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Zhida Zhao ◽  
Nanyang Yu ◽  
Tao Yu ◽  
Lisha Ye
Keyword(s):  
Control Strategy ◽  
Thermal Model ◽  
Air Conditioning ◽  
Thermal Characteristic ◽  
State Space Model ◽  
Water System ◽  
Water Pipe ◽  
Preview Control ◽  
Air Conditioning System ◽  
Chilled Water

As an important subsystem in air-conditioning system, water system connects the chiller and terminal equipment. Therefore, it is necessary to develop an accurate thermal model for chilled water pipe to create the suitable indoor temperature and humidity environment. In this paper, the thermal model of the pipe was considered by utilizing the simplified thermal time-delay state-space model with the mass, energy balance, and heat consumption equations. Based on this improved model, the preview control as control strategy for water pipe temperature was proposed, and its robustness and stability were discussed. Subsequently, the performances of this model and control strategy were tested in a fan-coil system simulating with MATLAB and TRNSYS (Transient System Simulation Program). Explicitly, the results show that this model accurately predicts the thermal characteristic, and the average mean squared errors for water temperature were 11.14% and 12.82%, respectively. Meanwhile, the tracking effect of valve controller was better than the control strategy with no preview control.

A New Air-Conditioning System with Chilled Water Storage

2013 ◽  
Vol 405-408 ◽  
pp. 2964-2968 ◽  
Author(s):  
Hu Lin ◽  
Xin Hong Li ◽  
Peng Sheng Cheng ◽  
Bu Gong Xu
Keyword(s):  
Economic Performance ◽  
Air Conditioning ◽  
Storage System ◽  
Peak Load ◽  
Water Storage ◽  
Engineering Application ◽  
Load Shifting ◽  
Air Conditioning System ◽  
Storage Technology ◽  
Chilled Water

For the purpose of grid peak load shifting, chilled water storage has been paid more and more attentions to integrated with air-conditioning system. In this paper, a new air conditioning system with directly chilled water storage is given. With peak-valley Price, cost for power consumption can be saved 15%-20% by coordinated operation between chilled water storage system and air conditioning system. By sensitivity analysis of system economic performance on ratio of peak price to valley price, it is revealed that with much higher ratio of peak price to valley price, not only system economic performance can seldom be improved, but also chilled water storage is restricted for engineering utilization. This paper supplies theory reference for engineering application of chilled water storage technology.

Mixed Programming Using FORTRAN and VB of Pipe Network for Heating and Air Condition Water System

2012 ◽  
Vol 610-613 ◽  
pp. 2478-2482
Author(s):  
Yang Cui ◽  
Lei Huang
Keyword(s):  
Air Conditioning ◽  
Simulation Analysis ◽  
Water System ◽  
Pipe Network ◽  
Air Conditioning System ◽  
Mixed Programming ◽  
Simulating Analysis ◽  
Chilled Water ◽  
Fortran Language ◽  
Chilled Water System

As the scale of the air conditioning system is constantly increasing, some problems still exist and remain to be solved in the chilled water system. Among them, the leading problems lie in the insufficient research of the overall character on the user side and lack of simulation analysis. Corresponding calculating procedures are mixed programmed using VB and FORTRAN language to conduct to simulating analysis, to testify reliability and feasibility of the method.

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