Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26094
Title: Research on a novel DDC-based capacity controller for the direct-expansion variable-air-volume A/C system
Authors: Chen, W
Deng, S 
Keywords: Capacity controller
DX VAV A/C system
Experimental tests
Variable-frequency compressor
Issue Date: 2010
Publisher: Pergamon Press
Source: Energy conversion and management, 2010, v. 51, no. 1, p. 1-8 How to cite?
Journal: Energy conversion and management 
Abstract: A direct-expansion (DX) variable-air-volume (VAV) air-conditioning (A/C) system consists of a VAV air-distribution sub-system and a DX refrigeration plant. This paper reports in detail on a novel capacity controller developed for the DX VAV A/C system to regulate its compressor speed and hence its cooling capacity. The capacity controller consisted of both a numerical calculation algorithm (NCA), which was fundamentally based on the principle of energy balance using a number of real-time measured system's operating parameters, and a dead-band for decoupling the control actions from both the capacity controller and a conventional PI feedback controller for regulating the opening of an electronic expansion valve (EEV) in the refrigeration plant. To study the feasibility of the capacity controller, an experimental rig for the DX VAV A/C system having two conditioned spaces was built and experimental tests were carried out. The test results showed that using the capacity controller, the cooling capacity of the system's refrigeration plant can be accurately and continuously regulated and the supply air temperature well maintained at its desired value. The desirable independent zoning-control for space air temperatures can be successfully achieved by the DX VAV A/C system and the control performance for air temperatures in the conditioned space was highly satisfactory.
URI: http://hdl.handle.net/10397/26094
ISSN: 0196-8904
EISSN: 1879-2227
DOI: 10.1016/j.enconman.2009.05.028
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