[Hap-users] Energy savings

[Aaron Smith via Hap-users]

Hello Shankar,

There are many factors that go into the energy use for the two options, here
are a few:
- The chilled water plant will have condenser pumps, a cooling tower and
chilled water pumps that need to be factored in.  If your VRF system is
air-cooled it will not have those pieces of equipment.
- VRF systems have variable capacity compressors with good part load
efficiency, your chiller may not have good part load performance.
- On the system level, VRF systems have fan-coil units with small ECM motors
while your chilled water plant may be connected to a VAV system with large
fans.  - Ventilation for VRF systems is typically through dedicated outdoor
air units with heat recovery while VAV systems typically don't have heat
recovery.
- VRF systems often have heat recovery which reduced energy use when there
is simultaneous heating and cooling in the building.

Hope this helps.

Regards,
Aaron

Aaron Smith, P.Eng
M&R Engineering Ltd.


-----Original Message-----
Date: Fri, 27 May 2016 20:08:05 +0530
From: via Hap-users <hap-users at lists.onebuilding.org>
To: hap-users at lists.onebuilding.org
Subject: [Hap-users] Energy savings
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Dear sir,
I use the HAP software. I compare the energy savings for two system in HAP.
Those systems are water cooled chiller Vs VRF system.
The HAP result savings shown the VRF system. But the real case the chiller
connected load is less then the VRF system. VRF is 1.2 kW per Ton, Chiller
is 0.6 kW per Ton. How to get the savings for chiller from HAP. Please give
me the solution.
?
Shankar
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