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[EnergyPlus_Support] About condenser pump / airflow window

Dear all,
     I am simulating a chilled water plant with 4nos 930TR water 
cooled chillers and 1no 400TR chiller.
     In Condenser plant, first i used a single condenser plant with 
4 "larger capacity" cooling tower and 1 "Smaller capacity" Cooling 
tower to serve the chiller water plant. It is found that EnergyPlus 
always says condenser flow for Chiller XX is 0 and terminated. This 
kind of issue which i have never met before (I usually simulate the 
plant with same capacity chillers).
     So i change the operation scheme (lower the upper limit i.e. 
start the next (a larger capacity) equipment list). It can solve the 
above problem. But the other issue occurred, the program said that 
the water flowrate in and out demand loop does not match. Even i have 
set a bypass pipe, it still cannot solve this problem.
     Lastly, i try to set 5 condenser loops to serve this single 
chiller plant(each condenser loop for a single chiller), but the 
program crash after autosizing the second condenser water pump.
     To this end, i want to ask is it only allow 1 single condenser 
plant to serve a chiller plant loop. Second, how to solve the problem 
about flowrate of condenser loop.

     The other thing is to continue the problem about airflow window. 
I have used the example 
file "AirflowWindowsAndBetweenGlassBlinds.idf", it is found that the 
energy extracted by the airflow window is negetive under winter 
design day condition by changing the air flowrate in airflow window 
to 0. It is found that the plant heating capacity increased and the 
zone sensible heat loss increase. But the when summing up the heat 
extracted through airflow window and window heat loss, the total heat 
loss for the one with airflow is large. I still consider it does not 
make sense or can anyone suggest me how to read it.

Ernest Tsang

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