dear sirs, i'am using the type 668 (water to water heat pump ) in trnsys16 coupled with horizontal ground heat exchange type556 for heating a storage tank,when i'm using 1-minute time step and I'm increasing pump flow rates The temperature of the outlet load is set,but I have a problem with the values negatives temperature of outlet source . I do not know where is the problem exactly please find the attached program in trnsys thanks
Attachment:
heat pump668.tpf
Description: Binary data