ABSTRACT

The variable refrigerant flow air-conditioning system is an HVAC system that can perform at a high capacity with low consumption thanks to its variable-speed compressor. The paper introduces a TRNSYS model to build a simulation model to calculate the energy performance of an existing variable refrigerant flow system and to build a model that can be used as a reference when a VRF system is proposed to a certain situation. The TRNSYS model was compared with the actual energy consumption to see the data agreement between the two models. Temperature, Relative Humidity, and energy consumption were metered using proper instruments, and it was compared with the obtained simulation results. The validation of the simulation model showed close values to the actual system, as the obtained Normalized Mean Bias Error (NMBE) between the simulation and measured values for temperature and relative humidity was 4.3 and 7.6%, respectively. While it was around 7.8% for the total energy consumption. Besides, the paper proposed an Energy Recovery Ventilation to be simulated with the existing TRNSYS model to compare it with the same system without ventilation to see if it is feasible to add an Energy Recovery Ventilation unit to the existing system. It shows a worthy reason to be used, as it saves 18.8% annually of the energy consumption of the system.

摘要

钍éVAR可行的制冷剂流量空调系统是一种HVAC系统，它的变速压缩机可实现高容量，低消耗。本文介绍了一个TRNSYS模型，以建立一个仿真模型来计算现有可变制冷剂流量系统的能量性能，并建立一个模型，在将VRF系统应用于某种情况下可以作为参考。将TRNSYS模型与实际能耗进行比较，以查看两个模型之间的数据一致性。使用适当的仪器测量温度，相对湿度和能耗，并将其与获得的仿真结果进行比较。仿真模型的验证显示出与实际系统接近的值，因为获得的温度和相对湿度的模拟值与测量值之间的归一化平均偏差误差（NMBE）分别为4.3和7.6％。而总能耗约为7.8％。此外，本文还提出了一种利用现有TRNSYS模型进行模拟的能量回收通风系统，以将其与没有通风的相同系统进行比较，以查看在现有系统上添加能量回收通风单元是否可行。它显示了值得使用的理由，因为它每年可以节省系统能耗的18.8％。该论文提出了一种用现有的TRNSYS模型进行模拟的能量回收通风系统，以将其与没有通风的同一系统进行比较，以查看在现有系统中添加能量回收通风单元是否可行。它显示了值得使用的理由，因为它每年可以节省系统能耗的18.8％。该论文提出了一种用现有的TRNSYS模型进行模拟的能量回收通风系统，以将其与没有通风的同一系统进行比较，以查看在现有系统中添加能量回收通风单元是否可行。它显示了值得使用的理由，因为它每年可以节省系统能耗的18.8％。