Experimental Study of a Cooling Coil and the Validation of its Simulation Model for the Purpose of Commissioning

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  • コミッショニングのための冷却コイル特性実験とモデル精度の検証
  • コミッショニング ノ タメノ レイキャク コイル トクセイ ジッケン ト モデル セイド ノ ケンショウ

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Abstract

For HVAC system commissioning, it is important to evaluate the performance of the cooling coil in an air-handling unit. However, manual evaluation requires a great deal of time and effort. One solution is to predict the coil performance by simulation. However, it remains unclear whether the currently available simulation models can provide accurate results under various operational conditions. In the present study, a slit fin type coil was investigated by conducting two series of experiments, for the VAV system and the CAV system, respectively. For the experiments of VAV system, the exchanged heat and outlet water temperature were measured under the conditions of changing the set point of outlet air temperature and heat and outlet water temperature were measured under the air flow rate. In the experiments of CAV system, the exchanged conditions of keeping air flow rate constant and changing water flow rate gradually. In addition, the inlet air temperature and humidity were also changed in the experiments of VAV system. Using the experiment data, the accuracy of the following seven simulation models was studied. 1) HASP/ACSS/8502 cooling/warming coil 2) HVACSIM+Type602 3) SIMBAD Detailed static cooling coil 4) ASHRAE Type63 5) Niitsu model 6) TRNSYS Type52 7) Calculation method using the coefficient of the wet surface The simulation results of heat exchanging were less than the measurement results. All the models had the tendency of simulating outlet air temperatures a little higher and outlet water temperatures a little lower than the experimental results. SIMBAD, ACSS and Calculation method using the coefficient of the wet surface showed the good accuracy. It is desirable to select an appropriate model according to the purpose, because the model accuracy differs with respect to the calculation item.

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