Globally, ductless heat pumps are the standard method of heating and cooling residential and commercial buildings. In North America the post-war building boom favoured ducted systems but we since realized there are advantages to ductless systems, especially to cool.

For commercial applications, Variable Refrigerant Volume (or Flow) systems are quickly becoming an option of choice in North America. In Japan where VRV/F was invented in 1982 half of all small commercial buildings use this ductless system.

If you are in Ontario contact me at ductlessontario@gmail.com for design, pricing, selection, installation, or technical assistance. Posts here are provided for information purposes only and not necessarily endorsed.

Tuesday, August 28, 2012

ASHRAE NB/PEI SEPT 2011: VARIABLE REFRIGERANT FLOW SYSTEMS Technology Overview

by

Roger Nasrallah, ing.
Enertrak inc.


VRF Presentation Contents
1. What is Variable Refrigerant Flow?
2. Why do we use VRF system?
3. How does VRF work?
4. VRF Indoor/Outdoor Units Capacity Control
5. Benefits of VRF Capacity Control
6. Different VRF Systems
7. Design Around Diversity
8. Comparing VRF to « Conventional Systems »

[Continued...pdf]

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