VRF Performance on 100o DB summer 32o Winter 780WB
VRF Performance on 100o DB summer 32o Winter 780WB
(OP)
How would a VRF system work compared to a WSHP system under these conditions? DB 100oF 32oF WB 78
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VRF Performance on 100o DB summer 32o Winter 780WB
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RE: VRF Performance on 100o DB summer 32o Winter 780WB
I've been using Mitsubishi VRF systems in northern climes with design temps in the 90's in summer & well below 0dF in winter. We've had a number of them operating well into the low 20s & even mid teens before having to add aux heat. I've got 120 tons in an underground parking ramp using outdoor ambient most of the year & circulation parking ramp air to temper the units when the outdoor temps drop into the teens. It's working great with energy consumption on par with geothermal & 1/3 the upfront installed cost.
With a 100db 78wb summer design, I don't think there would be a VRF issue as most are nameplate rated at 95-100dF.
I was licensed by IGSPHA in the early 90's for loop field design & install, and I now believe it's dead tech. VRF is the future of this industry.
RE: VRF Performance on 100o DB summer 32o Winter 780WB
RE: VRF Performance on 100o DB summer 32o Winter 780WB
In practice, I would always look at manufacturer's fine print about defrost cycles, as it will affect real feel of efficiency more than anything else, in practice, especially if thermal inertia of building is relatively low, as is in some commercial buildings.
Commercial building, however, often make good ground for three-pipe (recovery) systems, which are really good thing if designed and decided on with care.
RE: VRF Performance on 100o DB summer 32o Winter 780WB
RE: VRF Performance on 100o DB summer 32o Winter 780WB