Water Chiller and relative Pumps-System 8

Dear All, I’m modelling a water centrifugal chiller in System 8 of ASHRAE 90.1 (Appendix G), using HAP by Carrier. 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.