The Experiment Study on Heating Characteristics of Ground-source Water-cooled VRF System
|School||Qingdao Technological University|
|Course||Heating, Gas Supply , Ventilation and Air Conditioning Engineering|
|Keywords||the ground-source water-cooled VRF system the indoor-units openingratio the flow ratio the entransy transfer efficiency Variable water flow|
The outdoor air temperature has a great influence on the shallow soil temperature,but its influence on deep underground rock temperature is paltry. The deep undergroundrock temperature keep stably year-round, and it is lower than the outdoor airtemperature in the summer, but is higher than the outdoor air temperature in the winter,so the underground rock is a good cool-heat source. The ground-source water-cooledVRF system take the underground rock as the cool-heat source, it is a newair-conditioning system which combine the ground source heat pump system with thewater-cooled VRF system., it has been subjected to extensive attention since itsinception.This project was relied on the ground-source water-cooled VRF system test-bedwhich was built in a luxury villa of QingDao. This article studied mainly on the unit andsystem performance on the heating operation, and test the unit and system operationcharacteristics under different indoor-units opening ratio and the flow ratio. and thisarticle analyze the heat transfer process of the unit and system by the theory of entransy,and researched the variation of the unit and system performance in the perspective ofheat transfer. The main content is as follows.1. The unit and system performance under the indoor-units opening ratio: thechange rule of the unit inlet and outlet water temperature, the variation of the unit andsystem COP, power loss, entransy loss and entransy transfer efficiency;2. This article studies on the system performance under the different system loadratio, and mainly discussed the units and systems entransy transfer efficiency, theoperation characteristics and the changes of the unit inlet and outlet water temperaturein the different outdoor meteorological parameters;3. The article has researched the effect on the ground-source water-cooled VRFsystem when water flow varies on pipe side. It mainly study the influences of varyingwater flow on the unit inlet and outlet water temperature, heat transfer performance ofthe plate heat exchanger (evaporator), the operation performance and the entransytransfer efficiency of the unit and system;4. The paper has also studied the heat transfer characteristics of the ground. we hasresearched the thermal radius of the running role, and tested the heat recovery ability ofthe ground.The ground-source water-cooled VRF system can save energy, protect environment significantly, and apply renewable energy (clean energy). This research provide atheoretical reference and technical support for the research and engineeringapplications of the ground-source water-cooled VRF system.