[EnergyPlus_Support] condfd Vs ctf

["basill_xw" <basill_xw@xxxxxxxxx>]

I will simulate a building containing PCMs.So I would like to test 
energy+ calculations using CondFD instead of CTF for a buliding without 
PCMs.
I created a buliding model(about 10 thermal zones) wihtout heating and 
cooling equipments in 
designbuilder V1.3. First I finished the simulation with CTF algorithm
(time step in hour is 6).Sencond I finished the simulation with Condfd
(time step in hour is 60). And both algorithms reach convergence during 
the warmup days.
Then I compared the two results,there is a big difference between the 
two results. The amplitude of indoor temperature(from Condfd algorithm)
is much smaller than the amplitue of indoor temperature(from CTF 
algorithm).
And I have done the same work in e+ v2.0. There is the same problem.

Does anybody know why ?
thank for your help in advance!




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