Dear All,
I?m modelling a water centrifugal chiller in System 8 of ASHRAE 90.1
(Appendix G), using HAP by Carrier, for a LEED Certification (LEED C&S
2009).
I have to need how calculate the minimum entering condenser water
temperature (ECWT) for a water-cooled chiller and the part-load ratio below
which cycled operation occurs. This cycling point is defined as a
percentage of full load capacity. How I could calculate these data? Should
I consider 21 ?C as minimum temperature?

About Cooling Control I understand that 2 chiller equally sized have to be
equally unloading. Am I right?

No instructions are given for Cooling Tower: Full Load Fan kW, fan
electrical Efficiency and % Airflow at Low fan Speed. Where can I get these
data?

Then I have to model the Primary/Secondary Systems with variable-speed. In
my case the building has a floor area more than 20,000 m2.
I have to put in the software the ?Mechanical and Electrical efficiency?
and the ?W/L/s? for both pumps in Primary Loop and in Secondary Loop.
How could I calculate the data for the two loops?
The ASHRAE in the Section G3.1.3.10 gives me only 349 kW/1000 L/s but not
the other data.

Moreover I have to put in these data for the secondary loop: Control Head
(kPa) and Minimum Pump Flow (%).

Thanks.

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*Giusy Amorusi*

Ufficio Tecnico Meccanico

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