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Title: Development of a superheat controller for mitigating hunting in a direct expansion air conditioning system
Authors: Xia, Y
Ding, Q
Jiang, Z
Deng, S 
Song, M
Keywords: Degree of superheat
Direct expansion
Operational stability
Issue Date: 2019
Publisher: Elsevier
Source: Energy procedia, 2019, v. 158, p. 2085-2091 How to cite?
Journal: Energy procedia 
Abstract: This paper reports a development of a new degree of superheat (DS) controller which can slow down the rate of DS signal transfer in a direct expansion (DX) air conditioning (A/C) system for help mitigate operational instability. Through analyzing the heat transfer occurred at the outlet of an evaporator where the DS was evaluated, the dynamics of the DS signal transfer could be simply characterized by a first-order transfer function model (FOM). The new DS controller was thus developed by incorporating a FOM into a conventional proportional-integral (PI) controlled EEV-evaporator control loop, so that the rate of DS signal transfer could be regulated through varying the time constant of the FOM. Using an experimental DX A/C system, controllability tests for the new DS controller were carried out. Experimental results showed that the new DS controller would help mitigate possible system hunting when the experimental DX A/C system was unstably operated. The developed control strategy provides an alternative way to regulate the DS with an emphasis on operational stability.
Description: 10th International Conference on Applied Energy, ICAE 2018, Hong Kong, 22-25 August 2018
EISSN: 1876-6102
DOI: 10.1016/j.egypro.2019.01.481
Rights: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license ( Peer-review under responsibility of the scientific committee of ICAE2018 – The 10th International Conference on Applied Energy.
The following publication Xia, Y., Ding, Q., Jiang, Z., Deng, S., & Song, M. (2019). Development of a superheat controller for mitigating hunting in a direct expansion air conditioning system. Energy Procedia, 158, 2085-2091 is available at
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