S18 -- Variable-Refrigerant-Flow Systems (SI)

Variable-refrigerant-flow (VRF) HVAC systems are a direct-expansion (DX) heat pump technology platform built on the standard reverse Rankine vapor compression cycle. These systems are thermodynamically similar to unitary and other common DX systems, and share many of the same components (i.e., compressor, expansion device, and heat exchangers). VRF systems transport heat between an outdoor condensing unit and a net-work of indoor units located near or within the conditioned space through refrigerant piping installed in the building. Attributes that distinguish VRF from other DX system types are multiple indoor units connected to a common outdoor unit (single or combined modules), scalability, variable capacity, distributed control, and simultaneous heating and cooling.

Chapter Table of Contents

Standards
Equipment
VRF Heat Pump System Operation
Design Considerations
VRF System Design Example

ISBN: 978-1-936504-26-8 (for SI versions of chapters)
ISSN: 1930-7705 (for SI versions of chapters)

Citation: 2012 ASHRAE Handbook -- HVAC Systems and Equipment: Chapter 18,Variable-Refrigerant-Flow Systems



Product Code(s): D-S182012SI