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[Hap-users] Energy savings Aaron Smith via Hap-users hap-users at lists.onebuilding.org Wed Jun 1 10:21:36 PDT 2016 Next message: [Hap-users] Building obstruction Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] 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 To: hap-users at lists.onebuilding.org Subject: [Hap-users] Energy savings Message-ID: Content-Type: text/plain; charset="iso-8859-1" ? 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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