A hybrid dynamic modeling of active chilled beam terminal unit

Chen, Can; Cai, Wenjian; Karunagaran, Giridharan; Wang, Youyi

doi:10.1016/j.apenergy.2014.04.069

Cited by 45 publications

(18 citation statements)

References 19 publications

(38 reference statements)

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“…When the primary air flow rate is too low, part of the primary air will flow out from the return air inlet directly because of the gravity and little return air will be inducted which will degrade the performance of the RIDU. Compared to the chilled beam [23][24][25][26][27][28], because the mixed air will exchange heat with the radiant panel, the induction ratio cannot be too high to prevent a reduction in the temperature difference between the mixed air and the pore radiant panel. However, a sufficient mixed air flow rate needs to be ensured to maintain a sufficient heat exchange efficiency.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Study of the Radiant Induction-Unit and the Induction Radiant Air-Conditioning System

Zhang

2016

Energies

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Abstract:In this paper we proposed the novel air-conditioning system which combined induction ventilation and radiant air-conditioning. The indoor terminal device is the radiant induction-unit (RIDU). The RIDU is the induction unit combined with the pore radiant panel on which the copper pipes with rigid aluminum diffusion fins are installed. The two-stage evaporator chiller with the non-azeotropic mixture refrigerant is utilized in the system to reduce the initial investment in equipment. With the performance test and the steady state heat transfer model based on the theory of radiative heat transfer, the relationship between the induction ratio of the RIDU and the characteristic of the air supply was studied. Based on this, it is verified that the RIDU has a lower dew-point temperature and better anti-condensation performance than a traditional plate-type radiant panel. The characteristics of the radiation and convection heat transfer of the RIDU were studied. The total heat exchange of the RIDU can be 16.5% greater than that of the traditional plate-type radiant terminal.

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Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Study of the Radiant Induction-Unit and the Induction Radiant Air-Conditioning System

Zhang

2016

Energies

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“…All the chilled water pipes and fittings and temperature sensors are properly thermally insulated. A detailed description and an uncertainty analysis of the experimental setup can be found in [34].…”

Section: Heat Transfer Performance Measurementmentioning

confidence: 99%

Further study on the heat exchanger circuitry arrangement for an active chilled beam terminal unit

Chen

Cai

Wang

et al. 2015

Energy and Buildings

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“…In the present study, the simulation is performed on a simulated conditioned-zone and an experimentally validated ACB terminal unit model [1]. The zone is measured at 4.2m×4m×3m and the system nominal operating conditions are given in Table 1.…”

Section: Simulationmentioning

confidence: 99%

“…The sophisticate entrainment and heat exchange processes inside the ACB terminal unit are modeled in a hybrid manner, which are reported elsewhere in detail [1]: …”

Section: Systerm Description and Modelmentioning

confidence: 99%

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Design of a fuzzy controller for the active chilled beam system

Chen

Cai

Wang

et al. 2014

2014 9th IEEE Conference on Industrial Electronics and Applications

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This paper presents a fuzzy controller for the Active Chilled Beam (ACB) system, which is capable of maintaining the predetermined indoor relative humidity and temperature under time-varying thermal loads. Following the divide-and-conquer strategy, the complex nonlinearities are mitigated by a set of linear Takagi-Sugeno's (T-S) fuzzy approximations. Accordingly, the Linear Quadratic Regulator (LQR) is utilized. The thermal loads upon the system and the unknown state are estimated via an observer and then a disturbance rejection component is appended to the LQR. The relative humidity and the temperature are respectively controlled by varying the primary air volume flow rate and the chilled water inlet temperature. Simulations are performed based on a simulated single zone thermal system and an experimentally verified ACB terminal unit. The utility of the proposed control strategy is demonstrated.

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A hybrid dynamic modeling of active chilled beam terminal unit

Cited by 45 publications

References 19 publications

Experimental and Numerical Study of the Radiant Induction-Unit and the Induction Radiant Air-Conditioning System

Experimental and Numerical Study of the Radiant Induction-Unit and the Induction Radiant Air-Conditioning System

Further study on the heat exchanger circuitry arrangement for an active chilled beam terminal unit

Design of a fuzzy controller for the active chilled beam system

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