可变制冷剂流量（VRF）系统的热回收技术具有很好的潜力，通过允许单个室内机根据需要加热或冷却，同时压缩机负载受益于内部热回收，从而降低建筑能耗，并在许多商业建筑类型中保持良好的热舒适性。本研究探讨了采用液压换热器的带生活热水（DHW）回路的VRF系统的集成热回收系统设计。通过集成热回收VRF配置，当同时需要空间冷却时，蒸汽压缩循环产生的冷凝热可以回收并用于空间加热和/或DHW生产。该策略可能会提高现有热回收VRF技术的节能效果，并通过VRF室外机将废热降至最低。在该VRF系统中，与VRF制冷剂回路箱相连的液压热交换器与水箱相连，能够提高生活热水侧的热回收潜力。 为了评估拟建VRF系统的节能潜力，本研究在美国6个气候区使用DOE-2.2对一栋九层酒店建筑（共395间客房）进行了案例研究。基于模拟的每小时建筑负荷，还开发了一个计算工具，用于估算供暖/制冷和DHW能源使用。研究结果表明，在制冷和供暖主模式下，建议的VRF系统的年节能率分别为22%至24%和0.3%至1.4%。就DHW年节能而言，与美国6个气候区的基准VRF相比，拟建VRF系统可实现DHW年节能54%至91%。引用:2019年冬季会议，佐治亚州亚特兰大，会议论文

Heat recovery technologies of variable refrigerant flow (VRF) systems have good potential to reduce the building energy consumption and maintain goodthermal comfort in many commercial building types by allowing individual indoor units to heat or cool as required while the compressor load benefits fromthe internal heat recovery. This study investigates an integrated heat recovery system design of a VRF system with a domestic hot water (DHW) loop usinga hydraulic heat exchanger. With the integrated heat recovery VRF configuration, the condensing heat from vapor compression cycles can be recovered andused for space heating and/or DHW production when space cooling is simultaneously required. This strategy could potentially improve the energy savingsof the existing heat recovery VRF technology and minimize waste heat through VRF outdoor units. The hydraulic heat exchanger linked to the VRFrefrigerant circuit box in this VRF system is connected to the water tank and is able to increase the heat recovery potential on the domestic hot water side.To evaluate energy savings potential of the proposed VRF system, a case study of a nine-story hotel building with 395 guest rooms is carried out in thisstudy using DOE-2.2 in 6 U.S. climate zones. Based on simulated hourly building loads, a calculation tool is also developed to estimate heating/coolingand DHW energy usages. The results from the study show that the annual energy savings of the proposed VRF system can be around 22% to 24% andaround 0.3% to 1.4% in cooling and heating main mode, respectively. In terms of annual DHW energy savings, the proposed VRF system can achievearound 54% to 91% of annual DHW energy savings when compared to the baseline VRF in 6 U.S. climate zones.