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If you are getting negative temperatures from the outlet of the heat pump source side that means that the source liquid is coming into the heat pump cold (probably from the ground). There are legitimate reasons why this can happen in the real world. It could be that your ground heat exchanger is small and therefore does not absorb enough heat from the surrounding ground. It could also mean that your application is in a cold climate and that the ground temperature is too low for the heat exchanger to gain any useful energy. It is possible to change to using a glycol working fluid but that is often prohibitively expensive. kind regards, David
On 04/16/2018 00:42, berkane ahlem via
TRNSYS-users wrote:
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 -- *************************** David BRADLEY Principal Thermal Energy Systems Specialists, LLC 22 North Carroll Street - suite 370 Madison, WI 53703 USA P:+1.608.274.2577 F:+1.608.278.1475 d.bradley@tess-inc.com http://www.tess-inc.com http://www.trnsys.com |