Simplified thermodynamic modeling of chilled water coils based on bypass factors

Sarkar, Mridul

doi:10.1016/j.enbuild.2015.06.066

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…The humidity-heat alternative test experiences different periods of time, so it shows varied requirements for temperature and it does not work to use chilled water of the same temperature [11][12]. According to quite a few trials and comparisons on the spot, the following expert control scheme for chilled water is applied:…”

Section: Expert Control Over Chilled Water Temperaturementioning

confidence: 99%

Expert controller in multi-variable System of Temperature and Humidity

Yinping¹,

Lu²

2017

International Journal of Engineering &Amp; Applied Sciences

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In order to ensure the humidity-and heat-resistance ability of the equipment, this paper, combined with the environment simulation test of an engineering equipment system, designs the control system of humidity-heat simulation test with S7-300 as the control core. This paper analyzes the temperature and humidity model in laboratory, and applies the principle of the expert control to the system control algorithm to improve the control performance of the system, which shows the characteristics of lagging, nonlinearity, interactive coupling of temperature control and humidity control, etc.

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Section: Expert Control Over Chilled Water Temperaturementioning

confidence: 99%

Expert controller in multi-variable System of Temperature and Humidity

Yinping¹,

Lu²

2017

International Journal of Engineering &Amp; Applied Sciences

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“…In order to obtain desirable temperature, Sarkar used by pass factors and water temperature changes instead of physical parameters to model coil performance. Data survey demonstrates that the model does not have necessary accuracy though it is a simple representation (Mridul, 2015). Yu developed cooling coil in dry and wet conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Cooling Coil for Control System Design Using Gray Box Approach

Nazari¹,

Ghaffari²

2016

MAS

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The purpose of the study is to design a method analyzing dynamic behavior of cooling coil in order to be applicable in online simulations. Coils account for the highest energy consumers among other components in an Air Handling Unit (AHU). Essential data as input-output of neural network is provided using energy and mass conservation equations. An implicit numerical method is used to solve dynamic equations of coil. The results of mathematical methods are applied in the output of neural network to design an online model. The proposed model is based on an active coil used in Heating, Ventilation and Air Conditioning (HVAC) systems of clean rooms in Iran Pasteur Institute. Since in active air handlers, input and outputs are not measured, here we model air conditioning systems generally. The results in comparison with actual system data indicate an acceptable performance of the proposed method, so that combination of numerical results with a nonlinear autoregressive exogenous model (NARX) makes it possible to control system effectively by saving a significant amount of time.

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“…In Tables 7 and 8 summarize the exergy flow for the 21 cases calculated based on Equations (11) through Equation (13).…”

mentioning

confidence: 99%

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

2018

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Abstract:A novel dedicated outdoor air system (DOAS) comprising a multi-stage direct expansion coil to produce extra-low temperature (XT) outdoor air to handle the entire space cooling demand has been confirmed more efficient than conventional systems. To further enhance the performance of XT-DOAS, the optimum number of cooling stages and treated outdoor air temperature need to be determined. This process requires the development of a coil performance model that takes into account the extra-high and extra-low entering air temperatures at the first and the last cooling stages. In this study, factory test data and field measurement data were used to develop such a performance model. Different statistical analyses were employed to validate the developed model. Based on the developed model, energy and exergy analyses were conducted to evaluate use of XT-DOAS for space cooling of a typical office building in Hong Kong. EnergyPlus was employed for the energy analysis. The laws of thermodynamics were used for the exergy analysis. Their combined results indicate that for better energy efficiency and performance for air-conditioning of office buildings in subtropical region, the optimum configuration for XT-DOAS is two cooling stages with a treated outdoor air temperature of 7 • C. The model developed and the energy and exergy analyses described will contribute significantly to future research in this area.

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Simplified thermodynamic modeling of chilled water coils based on bypass factors

Cited by 10 publications

References 13 publications

Expert controller in multi-variable System of Temperature and Humidity

Expert controller in multi-variable System of Temperature and Humidity

Modeling and Analysis of Cooling Coil for Control System Design Using Gray Box Approach

Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

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