Dynamic Simulation for Heat Transfer of Water Systems

• Main Authors: Chia-Peng Lu, 呂佳朋
• Other Authors: Ming-Huei Chu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/86527336044191603671

碩士 === 東南科技大學 === 機械工程研究所 === 102 === The dynamic simulations for heat transfer of the chilled water indirect heating system are studied in this paper. The conventional natural circulation direct heating water storage systems can provide steady water flow rate, but it is difficult to keep steady water temperature. The novel forced circulation indirect heating water storage systems can improve the stability of water temperature for water storage tank systems, which can be widely applied to solar energy, heat pump and energy saving air conditional heat water systems. In this study, the dynamic model of forced circulation heating water storage system is investigated and built. The water level control system of water storage tank is designed, and the temperature time responses for water storage systems simulated with Simulink. The simulation results show the temperature of tank water can keep steady with energy saving effect by control the circulation heat water. The chilled water systems are essential equipment for central air conditioning systems and cooling systems. For energy saving, the varied refrigerant flow (VRF) chilled water systems have been developed. The refrigerant flow is varied by changing speed of compressor. This study built the VRF chilled water system dynamic model. A PI controller is designed to control the speed of compressor for keeping the temperature of chilled water in setting temperature.