TED-AJ03-239 OPTIMIZATION OF CONTROL HARDWARE PLACEMENT IN A THERMAL-HYDRAULIC NETWORK

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概要

• 論文の詳細を見る

• Valves and pumps are essential components of chilled water networks. A common thermal control practice is to use a valve as the control element and a fluid temperature as the control variable, while a booster pump drives the chilled water to a secondary loop with the cooling coil. In order to achieve the cooling task as a function of the variable thermal load, a control system adjusts the flow rate or the temperature of the chilled water. There are many possible places where the valves and pumps may be physically located to achieve a similar control effect. The present study explores the discrete space of possible hardware placements for a specific layout and seeks the optimum under some specified criterion. The secondary loop chosen consists of a water-air cooling coil and five pipes : supply, bypass, coil inlet, coil outlet and return. Chilled water at a constant temperature is driven by a constant pressure drop. Hot air flows over the coil at a constant temperature and velocity. The hardware elements are a control valve and two booster pumps. Pumping action is divided among the two pumps to be able to look at possible combinations. A mathematical model of the thermal-hydraulic network is used as a basis for analysis. The change in operating conditions and the output temperature reachabilities of the control system are used as criteria to compare the relative merits of different configurations. For any given configuration, open loop control is used to determine the range of operation of the system on the leaving air temperature at the coil, i. e. the temperature range varies from 0.1 to 3.5 Celsius. The results show that the characteristics of the control system and that of the network are strongly influenced by the location of the hardware elements. The change in the returning water temperature is the operating condition used for comparison. The change is in the range of 0.2 to 18 Celsius. Under the given layout constraints, an optimum valve and pump placement configuration has been found that minimizes the change in operating conditions from the design values and maximizes the temperature reachability of the control system.

• 一般社団法人日本機械学会の論文

著者

• Yang K.

  Hydronics Laboratory Department Of Aerospace And Mechanical Engineering University Of Notre Dame

• Sen Mihir

  Hydronics Laboratory Department of Aerospace and Mechanical Engineering University of Notre Dame

• Franco Walfre

  Hydronics Laboratory Department of Aerospace and Mechanical Engineering University of Notre Dame

関連論文

• TED-AJ03-247 CONTROLLABILITY OF CONDUCTIVE-CONVECTIVE SYSTEMS
• TED-AJ03-239 OPTIMIZATION OF CONTROL HARDWARE PLACEMENT IN A THERMAL-HYDRAULIC NETWORK

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