Filter
Top Products
24 TRG-TRC016-EN
notes
period one
Types of Water Chillers
Note: Addendum J updates the minimum IPLV efficiency requirements in the
standard to match the methods included in the most current version of the ARI
rating standard. At the time this booklet was printed, Addendum J had not been
formally adopted as part of the standard. However, its adoption was deemed
sure enough to include in this publication.
The standard requires that both full- and part-load conditions be met. For
example, the efficiency of a water-cooled centrifugal chiller with a capacity
greater than 300 tons [1,056 kW] must be 6.1 COP, or better, at ARI standard
conditions. This is equivalent to 0.576 kW/ton. The part-load (IPLV) efficiency
must also be 6.4 (based on the efficiency units of COP) or better. This is
equivalent to an IPLV of 0.549 kW/ton.
Coefficient of performance (COP) is a unitless expression of efficiency, defined
as useful energy out divided by energy input. A higher COP designates a higher
efficiency.
The table in Figure 28 includes the minimum efficiency requirements for
absorption water chillers. For an absorption chiller, COP is defined as
evaporator cooling capacity divided by the heat energy required by the
generator, excluding the electrical energy needed to operate the pumps, purge,
and controls.
Again, these minimum efficiency requirements take effect on October 29, 2001.
The test procedure for these chillers is ARI Standard 560–1992. Note that the
efficiency requirement for single-effect absorption chillers is higher than many
manufacturers have offered in the past.
Section 6.3.4 of Standard 90.1 includes additional requirements for the design
and operation of chilled-water systems. These requirements will be mentioned
in later periods.
kW/ton
3.516
COP
---------------=
standard 90.1-1999 efficiency requirements
Water-Cooled Absorption Chillers
chiller type
single-effect
double-effect
indirect-fired
direct-fired
chiller type
single-effect
double-effect
indirect-fired
direct-fired
capacity
all capacities
all capacities
all capacities
capacity
all capacities
all capacities
all capacities
minimum efficiency*
0.7 COP
1.0 COP 1.05 IPLV
1.0 COP 1.0 IPLV
minimum efficiency*
0.7 COP
1.0 COP 1.05 IPLV
1.0 COP 1.0 IPLV
* as of October 29, 2001
* as of October 29, 2001
Figure 28