<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:12pt"><div>Dear TRNSYS users,</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">My name is Metkel, I am a researcher at London South Bank University, I am currently trying to simulate a GSHP system. the GSHP is controlled by the outside temperature, if the outside temperature is less than 14 then a control signal tells the GSHP to run in heating mode, if the outside temp is greater than 18 then the control signal tells the GSHP to run in cooling mode.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">However I couldn't figure out how to write the equation to the following please.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">1. based on the outside temperature to send a signal to the heat pump.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">2. based on the outside temperature to retrieve the cooling or heating load of the building from</div><div
style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"> type 9a which contains the building load.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">3. based on the outside temperature to also send a signal to the circulation pumps to switch them</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"> on or off accordingly.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial,
'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">Any suggestions would be much appreciated please.</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
background-color: transparent; font-style: normal;">Regards,</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;">Metkel</div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16.363636016845703px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><br></div></div></body></html>