A water loop variable refrigerant flow（WLVRF）air-conditioning system is designed to be applied in large-scale buildings in northern China.The system is energy saving and it is an integrated system consisting of a va...A water loop variable refrigerant flow（WLVRF）air-conditioning system is designed to be applied in large-scale buildings in northern China.The system is energy saving and it is an integrated system consisting of a variable refrigerant flow（VRF）air-conditioning unit,a water loop and an air source heat pump.The water loop transports energy among different regions in the buildings instead of refrigerant pipes,decreasing the scale of the VRF air-conditioning unit and improving the performance.Previous models for refrigerants and building loads are cited in this investigation.Mathematical models of major equipment and other elements of the system are established using the lumped parameter method based on the DATAFIT software and the MATLAB software.The performance of the WLVRF system is simulated.The initial investments and the running costs are calculated based on the results of market research.Finally,a contrast is carried out between the WLVRF system and the traditional VRF system.The results show that the WLVRF system has a better working condition and lower running costs than the traditional VRF system.展开更多
多联机空调系统运行负荷变化范围大,现有定蒸发温度控制策略往往导致系统运行能效低,室内温度波动大等问题。开发了变蒸发温度控制策略,通过预测负荷,实时调节蒸发温度设定值,提高系统效率并改善室内温湿控制。控制策略的核心是空调负...多联机空调系统运行负荷变化范围大,现有定蒸发温度控制策略往往导致系统运行能效低,室内温度波动大等问题。开发了变蒸发温度控制策略,通过预测负荷,实时调节蒸发温度设定值,提高系统效率并改善室内温湿控制。控制策略的核心是空调负荷的快速在线预测,通过建立(Elman和长短期记忆神经网络,long short term memory,LSTM)两类数据模型,替代复杂且计算速度较慢的建筑物理模型。Elman和LSTM模型的平均相对误差分别为8.6%和2%,LSTM精度高,计算速度快,适宜与机组控制模块耦合。在此基础上,通过多联机系统模型和建筑模型的联合仿真,对基于负荷预测的变蒸发温度控制策略的运行效果进行了验证。研究表明,与定蒸发温度控制相比,变蒸发温度控制策略在兼顾房间热舒适性的前提下,其在广州典型制冷季的平均节能率为14%。该方法可应用到多联机的远程云端智能控制,降低建筑能耗及碳排放量。展开更多
文摘A water loop variable refrigerant flow（WLVRF）air-conditioning system is designed to be applied in large-scale buildings in northern China.The system is energy saving and it is an integrated system consisting of a variable refrigerant flow（VRF）air-conditioning unit,a water loop and an air source heat pump.The water loop transports energy among different regions in the buildings instead of refrigerant pipes,decreasing the scale of the VRF air-conditioning unit and improving the performance.Previous models for refrigerants and building loads are cited in this investigation.Mathematical models of major equipment and other elements of the system are established using the lumped parameter method based on the DATAFIT software and the MATLAB software.The performance of the WLVRF system is simulated.The initial investments and the running costs are calculated based on the results of market research.Finally,a contrast is carried out between the WLVRF system and the traditional VRF system.The results show that the WLVRF system has a better working condition and lower running costs than the traditional VRF system.
文摘多联机空调系统运行负荷变化范围大,现有定蒸发温度控制策略往往导致系统运行能效低,室内温度波动大等问题。开发了变蒸发温度控制策略,通过预测负荷,实时调节蒸发温度设定值,提高系统效率并改善室内温湿控制。控制策略的核心是空调负荷的快速在线预测,通过建立(Elman和长短期记忆神经网络,long short term memory,LSTM)两类数据模型,替代复杂且计算速度较慢的建筑物理模型。Elman和LSTM模型的平均相对误差分别为8.6%和2%,LSTM精度高,计算速度快,适宜与机组控制模块耦合。在此基础上,通过多联机系统模型和建筑模型的联合仿真,对基于负荷预测的变蒸发温度控制策略的运行效果进行了验证。研究表明,与定蒸发温度控制相比,变蒸发温度控制策略在兼顾房间热舒适性的前提下,其在广州典型制冷季的平均节能率为14%。该方法可应用到多联机的远程云端智能控制,降低建筑能耗及碳排放量。
