Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30656
Title: A DDC-based capacity controller of a direct expansion (DX) air conditioning (A/C) unit for simultaneous indoor air temperature and humidity control - Part II : further development of the controller to improve control sensitivity
Authors: Li, Z
Deng, S 
Keywords: Air conditioning
Capacity reduction
Compression system
Design
Experiment
Improvement
Refrigeration system
Regulation
Variable speed
Issue Date: 2007
Publisher: Elsevier
Source: International journal of refrigeration, 2007, v. 30, no. 1, p. 124-133 How to cite?
Journal: International journal of refrigeration 
Abstract: The development of the novel direct digital control (DDC)-based capacity controller for a direct expansion (DX) air conditioning (A/C) unit having variable-speed compressor and supply fan to simultaneously control indoor air temperature and relative humidity (RH) in a conditioned space served by the DX A/C unit has been reported in Part I of the two-part series. The results of preliminary controllability tests for the novel capacity controller presented in Part I, however, suggested that the controller developed was operational, with acceptable control accuracy but rooms for improvement with respect to control sensitivity. This paper, the second part of the two-part series, reports on the further development of the controller to improve its control sensitivity and the associated controllability test results. Both control accuracy and reasonable control sensitivity were achieved by incorporating a traditional Proportional-integral (PI) controller into the DDC-based capacity controller.
URI: http://hdl.handle.net/10397/30656
ISSN: 0140-7007
EISSN: 1879-2081
DOI: 10.1016/j.ijrefrig.2006.06.003
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