NPLV - What does NPLV stand for? The Free Dictionary

Acronym	Definition
NPLV	Nonstandard Part-Load Value (cooling towers)

References in periodicals archive ?

When you compare the COP or NPLV of the chillers only, the water-cooled units are obviously much more efficient.

HVAC chiller market to maintain steady growth

The report of NPLV as replicating in the brown planthopper, as a non-pathogenic infection (Nakashima & Noda 1995), suggests that DcRV may also be non-pathogenic to D.

Reovirus-like sequences isolated from adult Asian citrus psyllid, (Hemiptera: Psyllidae: Diaphorina citri)

IPLV and NPLV [AHRI 2003] are terms coined by the Air Conditioning, Heating, and Refrigeration Institute (AHRI), sometimes promoted as the method to analyze and compare chiller performance.

NPLV is calculated in exactly the same way, except at chilled water and condenser water conditions differing from these defined values.

Geister & Thompson argue that IPLV or NPLV do not accurately represent a chiller plant's operating characteristics, particularly in chiller plants with more than one chiller.

Easy-to-use methods for multi-chiller plant energy and cost evaluation

D = -0.147 + 7.04E-06 x CDD65 - 0.124 x NPLV + 0.0038 x WB + 0.00133 x APPROACH + 0.00217 x RANGE

Optimizing design & control of chilled water plants: part 5: optimized control sequences

The middle chart illustrates the type of chiller performance data that must be provided by manufactures if simulation modeling is to be accomplished; as stated above, peak-load performance and NPLV numbers (Geister 2009) are not adequate for simulation modeling.

Simulation modeling of a central chiller plant

Needless to say, the low NPLV chiller is frequently used during cooling season.

Bridging the gaps

The NPLV value is much larger than these CSE values.

New procedure for estimating seasonal energy efficiency ratio of chillers

First, it is important to recognize that AHRI's IPLV and NPLV evaluation methods were created to help compare the unloading characteristics of similar chillers--not to infer economic savings.

So, while variable-speed drives can offer significant savings in the right application for centrifugal chillers, they give the perception of efficiency gains when the IPLV/ NPLV formula is applied--a recipe for selling more drives, and not necessarily offering real energy savings.

IPLV/ NPLV methodology makes sense when determining minimum efficiency requirements such as in the Standard 90.1 or IECC efficiency standards (Figure 10, p.

A closer look at chiller ratings

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