Hello, I am trying to simulate the operation of a climate control unit (vapor compression air conditioner and electric resistance heater) in a small closed space. The climate control unit (CCU) (Type 202 and the accompanying DLL7) is an original component created from manufacturer's data. Prior to the heater and air conditioning code within the Type202.f code, there is a switch that keeps the air conditioner and heater from operating simultaneously. The climate control unit is operated via a PID controller (Type 23). In addition, the space also has an internal heat load due to some electronics, hence the three type 9a components and the Type 41c. If the heat from the CCU is input into Type 56 through the heating function in TRNBuild and the cooling output from the CCU is attached likewise, there are a number of points over the course of the TMY2 year at which the program "bogs down" and stops with the calculations though no error message is produced. Occasionally an error message will pop up stating that there are 6 errors (no matter how many I have set to allow within the control cards), which all relate to temperature divergence at a wall, according to the list file. I have tried increasing the convergence tolerance with no luck. If the cooling portion is removed, the program proceeds fine, with or without the internal loads attached. I have sought help for a similar problem, to which I was suggested to decrease the cooling output and/or decrease the time interval to aid in convergence. I've tried reducing the cooling input to very low values (the DLL I'm sending has it cut in half) with no luck. The current time interval is a dreadfully slow 5 seconds. I have also tried connecting the cooling output of the CCU to the Type 56 using the gain function (using a negative value as input) with the same result. Attached are the project, bui, component (fortran and proforma) files and the DLL. Please help! Thanks, Ethan Lust University of Maryland
Attachment:
Dll7.dll
Description: application/msdownload
Attachment:
Cabin plus internal loads plus CCU (heating only).tpf
Description: Binary data
Attachment:
Cabin plus internal loads plus CCU.tpf
Description: Binary data
Attachment:
HR_cabin_c_R46.bui
Description: Binary data
Attachment:
Type202.tmf
Description: Binary data