[TRNSYS-users] Simulating an existing installation using a water-water heat pump

[metkell yebiyo]

Dear TRNSYS Users,
I am using a water-water heat pump (Type 927) to simulate an existing installation.
I have the heating and cooling demand profiles of the building, therefore I use an equation with the formula Q=m*Cp*ΔT to calculate the returning temperature of the fluid (T2) in the load loop for each time step. 
Flow rate = 6.8 l/s

Cp = 4.18
dT= (Q*3600)/(Flowrate_to_Load*Cp)
T1 = Constant
T2 = T1-dT
Q = heating or cooling load
1. when calculating dT how do I differentiate between the heating and cooling data?
2.Should the return temperature (T1) from the heat pump be constant or is there another way of calculating the return temperature?
For the load loop the only components I use are the heat pump, one equation and a single speed pump.

Thank you in advance.

Regards,
Metkel Yebiyo BEng (Hons), MSc
CEREB PhD Researcher - Ground Source Heat Pumps 
Room T615 
Department of Urban Engineering 
Faculty of Engineering, Science and the Built Environment
London South Bank University, 
103 Borough Road,
London SE1 0AA
Tel: +44 (0)20 7815 7639
E: yebiyom at lsbu.ac.uk
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