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DESIGN OPTIMIZATION
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Optimized (mixed)
It is important to avoid defining a project as a ‘heat recovery job’ or ‘heat
pump job’. There are often applications where a mixture of both types is the
best design practice - and can reduce costs to the client.
Note: The use of heat recovery does not always mean a branch selector box
for each for each indoor unit or even each area – this is a good way to reduce
costs further without compromising flexibility.
When to use MULTIPLE MODULES
There are several advantages to linking VRV condensing units together:
Less piping & total refrigerant needs, superior efficiencies due to more
outdoor unit heat exchange surface area at partial load and a greater
likelihood of heat recovery (on 3-pipe) to occur due to increase in varying
zones on the systems.
Note: This design option is often overlooked due to refrigerant limitations
in small spaces set by ASRAE Std. 15
Current ASHRAE Std. 34 Regulations: 26lbs of R410A refrigerant
per 1000ft³ (0.026lbs/ft³) in normal occupancies.
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