Is higher or lower NPLV better?
IPLV represents the cooling efficiency of a unit operating over its entire range of unloading. Unless the unit will operate at or near its full load value 100% of the time, a lower IPLV is more desirable for better overall performance.
What is NPLV chiller?
Many chiller manufacturers such as Chiltrix also offer an NPLV rating. NPLV stands for Non-Standard Part Load Value. In addition to IPLV, Chiltrix uses an NPLV rating for loop water temperature of 55F. The Chiltrix NPLV rating is the rated efficiency of the system when using a non- standard loop temperature.
What is a good chiller COP?
For water cooled chillers, the minimum COP is 4.2 and the minimum IPLV is 5.2; for air cooled chillers the minimum COP is 2.5 and the minimum IPLV is 3.4. In general, water cooled chillers are more compact, less noisy, have longer operating lives and are more energy efficient than air cooled chillers.
How is NPLV calculated in chiller?
Calculation of NPLV rating
- A is the chiller efficiency at 100% load.
- B is the chiller efficiency at 75% load.
- C is the chiller efficiency at 50% load.
- D is the chiller efficiency at 25% load.
Are chillers efficient?
In general, centrifugal chillers with variable speed drives can typically see a 10 percent to 13 percent efficiency gain for every 5 degrees of condenser water temperature relief. Constant speed chillers also benefit, but only about 5 percent efficiency gain for every 5 degrees of chilled water relief.
How do cops convert to efficiency?
The COP is an instantaneous measurement in that the units are power which can be measured at one point in time. COP can be used to define the cooling efficiency for a cooling system – or the heating efficiency for a heat pump system. COP can be treated as an efficiency where COP of 2.0 = 200% efficiency.
What does NPLV stand for?
|NPLV||Nonstandard Part-Load Value (cooling towers)|
What is IPLV chiller?
The Integrated Part Load Value (IPLV) is a performance characteristic developed by the Air-Conditioning, Heating and Refrigeration Institute (AHRI). It is most commonly used to describe the performance of a chiller capable of capacity modulation.
How do you find a real cop?
Coefficient of Performance Formula You can calculate the coefficient of performance by dividing how much energy a system produces by the amount of energy you input into the system.
How is cop calculated?
COP (Coefficient of Performance) For example: A given heat pump used for air cooling has a COP = 2. This means that 2 kW of cooling power is achieved for each kW of power consumed by the pump’s compressor. Therefore, the produced heat and the supplied power employ the same units during COP calculation.
How is ikW calculated?
Main performance parameter is ikW/TR and it is define by ratio of power input to compressor divided by tons of cooling produced. Lower ikW/TR indicates higher efficiency. COP (Co – efficient of Performance) is define by ratio of EER by 3.413.
What is the NPLV rating for a water cooled chiller?
For other design conditions, rating points vary linearly with load from design head to minimum of 65°F. ECWT at 50% load for water-cooled chillers and to minimum of 55°F ECAT at 33% load for air-cooled chillers.
What does NPLV stand for in chiltrix?
NPLV stands for Non-Standard Part Load Value. In addition to IPLV, Chiltrix uses an NPLV rating for loop water temperature of 55F. The Chiltrix NPLV rating is the rated efficiency of the system when using a non- standard loop temperature.
How are iplv and NPLV calculated for water chilling?
Performance of chiller is measured at different loading condition say 100%, 75%, 50% & 25% and IPLV or NPLV is calculated. For Water-chilling Packages covered by this standard, the IPLV or NPLV shall be calculated as follows: Determine the Part-load energy efficiency at 100%, 75%, 50%, and 25% load points at the conditions Specified in Table-1&3
Which is more efficient iplv or NPLV?
Chiltrix NPLV ratings are >/= 33% higher than its IPLV ratings. Chillers are inherently more efficient than regular air conditioners, but even so, there can be large differences in efficiency between chillers.