Review of the advances and applications of variable refrigerant flow heating, ventilating, and air-conditioning systems
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TECHNICAL NOTE
Review of the advances and applications of variable refrigerant flow heating, ventilating, and air‑conditioning systems for improving indoor thermal comfort and air quality Napoleon Enteria1 · Odinah Cuartero‑Enteria2 · Takao Sawachi3 Received: 28 February 2020 / Accepted: 5 May 2020 © Islamic Azad University 2020
Abstract The maintenance of a healthy and comfortable indoor environment consumes a significant amount of energy in the built environment. Heating, ventilating, and air-conditioning (HVAC) systems can provide a healthy indoor thermal environment and air quality. Variable refrigerant flow (VRF) HVAC systems utilize a refrigerant to transfer heat from a heat source to a heat sink by changing its phase from liquid to gas and from gas to liquid. VRF HVAC systems are becoming popular due to their flexible operation, particularly under dynamic thermal loading and weather conditions. The advances of the VRF HVAC system include the utilization of new materials and concepts that make the system robust and dynamic, give it high heat transfer capabilities, allow it to have a compact design, and make it energy efficient. Due to its energy efficiency, indoor thermal comfort and quality, and versatile applications, the VRF HVAC system is one of the most viable alternatives to conventional HVAC systems. As such, extensive efforts in the research, development, testing, and application of these systems have been made. Despite these advancements and the demand for high-quality, energy-efficient, and comfortable indoor thermal environments, VRF HVAC systems still require further development, which is the topic of this review paper. Keywords Variable refrigerant flow (VRF) · Heating · ventilating · and air-conditioning (HVAC) system · Outdoor environment · Indoor environment · Air quality
Introduction The selection and installation of the most appropriate airhandling and processing units to support indoor environment requirements are crucial to maintaining a healthy and comfortable indoor environment. Due to increasing energy and environmental concerns, combined with a demand for better indoor thermal comfort and air quality, variable
* Napoleon Enteria [email protected]; enteria@enteria‑ge.com; [email protected] 1
Department of Mechanical Engineering and Technology, College of Engineering and Technology, Mindanao State University - Iligan Institute of Technology, 9200 Iligan, Lanao Del Norte, Philippines
2
Surigao Del Sur State University – Cantilan Campus, 8317 Cantilan, Surigao Del Sur, Philippines
3
Building Research Institute, National Research and Development Agency, Tsukuba, Ibaraki 305‑0802, Japan
refrigerant flow (VRF) heating, ventilating, and air-conditioning (HVAC) systems are an alternative worth exploring.
Indoor Environment The maintenance of a healthy and comfortable indoor environment under different outdoor conditions is one of the most energy-intensive requirements of any built environment [1–4]. Under different climatic conditions, HVAC systems are nee
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