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Optimum control strategy and performance simulation of a constant temperature and humidity air-conditioning system.

[In Chinese. / En chinois.]

Author(s) : LI S., SHEN J., ZHANG X., et al.

Type of article: Article

Summary

Due to the large energy compensation caused by the fixed dew point on the cooling coil (CC) in the conventional constant temperature and humidity air-conditioning system, a new system employing a temperature and humidity independent control device (THIC device) in the CC and a method of PID split-range control, is developed in this paper. Based on the experiment verification, the operation states and the energy saving effects of the system under different heat and moisture loads have been simulated by TRNSYS 16 software. The results show that under different working conditions, the system can automatically control air temperature and humidity independently with a high precision, by adjusting the mass flow rate and the temperature of the chilled water into the CC, and the output of the heater of the humidifier. In the design of such CC, the heat transfer area should be calculated under a higher inlet temperature of the chilled water (for example, 12°C instead of the usual 7°C). The system is energy-efficient with a rate of 30% under low temperature high humidity condition and about 50% under high temperature and low humidity condition, compared with the conventional system.

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Pages: 22-27

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Details

  • Original title: [In Chinese. / En chinois.]
  • Record ID : 30004185
  • Languages: Chinese
  • Source: Journal of Refrigeration - vol. 33 - n. 143
  • Publication date: 2012/02

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