Daikin WMC Specifications download pdf (Page 14)

14 Catalog 602-2

Table 2, ASHRAE 90.1 Requirements (kW/ton)

Pre 2010 Starting in 2010

Path A Path B

Std. 90.1

Capacity

Range

Full

Load

IPLV

Full

Load-

IPLV

Full

Load-

IPLV

 150 Tons 0.703 0.669

0.634 0.596

0.639 0.450

 150 Tons

 300 Tons

0.634 0.596 0.634 0.596 0.639 0.450

 300 Tons

 600 Tons

0.576 0.549 0.576 0.549 0.600 0.400

NOTE: Beginning in 2010, the 90.1 efficiency

requirements have been divided into two groups,

designated as Path A and Path B. Path B is a new

category created for units with VFD compressor drives

that by nature have superior part-load efficiencies. WMC

Magnitude chillers, with their built-in VFDs, fall into

Path B.

The Path B IPLV values for 2010 are about 30 percent

less than the 2007 equivalent values. Also beginning in

2010, the minimum efficiency values are formula derived

instead tabular so that they can take flows and

temperatures other than AHRI standard into account.

AHRI Certification

McQuay International has an on-going

commitment to supply chillers that perform as

specified. To this extent, Daikin McQuay

centrifugal chillers are part of the AHRI

Certification Program. On-going performance

verification of chiller capacity and power input

plus AHRI certified computerized selection output

provide the owner with specified performance in

accordance with the latest version of AHRI

Standard 550/590.

All chillers that fall within the scope of the

certification program have an AHRI certification

label at no cost to the owner. Equipment covered

by the AHRI certification program includes all

water-cooled centrifugal and screw water chilling

packages rated up to 2500 tons (8800 kW) at AHRI

standard rating conditions, hermetic or open drive,

with electric driven motor not exceeding 5000

volts, and cooling water (not glycol).

Published certified ratings verified through testing

by AHRI include:

 Capacity, tons (kW)

 Power, kW/ton (COP)

 Pressure drops, ft. of water (kPa)

 Integrated Part Load Value (IPLV) or Non-

Standard Part Load Value (NPLV)

The AHRI Standard 550/590 for Centrifugal or

Screw Water-Chilling Packages and associated

manuals define certification and testing procedures

and performance tolerances of all units that fall

within the application rating conditions.

Leaving chilled water temp.: 40F to 48°F (44F

standard)

Entering condenser water temp.: 60F to 95°F

Leaving chilled water temp.: 44°F

Evap. waterside field fouling allowance: 0.0001

Chilled water flow rate: 2.4 gpm/ton

Entering condenser water temp.: 85°F

Condenser waterside field fouling allowance:

0.00025

Condenser water flow rate: 3.0 gpm/ton

IPLV/NPLV Defined

Part load performance can be presented in terms of

Integrated Part Load Value (IPLV), which is based

on AHRI standard rating conditions (listed above),

or Non-Standard Part Load Values (NPLV), which

is based on specified or job site conditions. IPLV

and NPLV are based on the following weighting

equation from AHRI 550/590:

Using kW/ton:

DCBA

IPLVorNPLV

12.0

45.0

42.0

01.0

Where:

A = kW/ton at 100%

B = kW/ton at 75%

C = kW/ton at 50%

D = kW/ton at 25%

Or, using COP values:

DCBAIPLVorNPLV 12.0+45.0+42.0+01.0=

Where:

A = COP at 100%

B = COP at 75%

C = COP at 50%

D = COP at 25%

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