Hailun Xie's profile - activity

I encountered the same problem. Could you tell me a little bit more about how to set control temperatures in single heated radiant system? How to set cooling temperatures values in winter? Thank you so much!

In my OS model, I used water to water heat pump to supply zone equipment with hot or chilled water. In cooling seasons, fan coils were used as zone terminals; in heating seasons, low temperature radiant systems were used as zone terminals. The simulations were run smoothly but with some warnings, some of them are temperatures too high in Plant Loop or in low temperature radiant system. I added output variables measure and intended to check fan coil hourly cooling rate and radiant system hourly heating rate, however it failed. What's the possible reason? Was it because of these warnings or the capacity of my heat pump too high(My heat pump was set to 33.3Kw while my model max load was only 15Kw)? I don't know why i can't attach my models here.Could anybody help out. It's very urgent thank you guys very much.

These are warnings: * Warning * GetSpecificHeatGlycol: Temperature is out of range (too high) for fluid [WATER] specific heat * * ~~~ * ..Called From:UpdateLowTempRadiantSystem,Temperature=[199.96], supplied data range=[0.00,125.00] * ~~~ * Environment=SHENYANG ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10 * Warning * GetDensityGlycol: Temperature is out of range (too high) for fluid [WATER] density * * ~~~ * ..Called From:FindCompSPLoad,Temperature=[200.05], supplied data range=[0.00,100.00] * ~~~ * Environment=SHENYANG ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10 * Warning * GetSpecificHeatGlycol: Temperature is out of range (too low) for fluid [WATER] specific heat supplied values * * ~~~ * ..Called From:UpdateSolarCollector,Temperature=[-22.13], supplied data range=[0.00,125.00] * ~~~ * Environment=SHENYANG ANN HTG 99.6% CONDNS DB, at Simulation time=01/21 00:00 - 00:10 *** Simulation Error Summary *** * Warning * The following Report Variables were requested but not generated * ~~~ * because IDF did not contain these elements or misspelled variable name -- check .rdd file * Warning * Plant loop exceeding upper temperature limit, PlantLoop="HW PLANT LOOP" *** * ~~~ * This error occurred 174179 total times; *** * ~~~ * during Warmup 23227 times; *** * ~~~ * during Sizing 0 times. *** * ~~~ ** Max=200.540972

*** * Warning * GetSpecificHeatGlycol: Temperature out of range (too high) for fluid [WATER] specific heat * *** * ~~~ * This error occurred 12525517 total times; *** * ~~~ * during Warmup 0 times; *** * ~~~ * during Sizing 0 times. *** * ~~~ ** Max=332057.625862 {C} Min=125.000717 {C}

*** * Warning * GetDensityGlycol: Temperature out of range (too high) for fluid [WATER] density * *** * ~~~ * This error occurred 7014256 total times; *** * ~~~ * during Warmup 0 times; *** * ~~~ * during Sizing 0 times. *** * ~~~ ** Max=200.638811 {C} Min=100.001035 {C}

*** * Warning * GetSpecificHeatGlycol: Temperature out of range (too low) for fluid [WATER] specific heat * *** * ~~~ * This error occurred 7254 total times; *** * ~~~ * during Warmup 0 times; *** * ~~~ * during Sizing 0 times. *** * ~~~ ** Max=-1.453330E-002 {C} Min=-23.1312 {C}

Thank you so much! Your response perfectly relieved my doubts about simulation results!

In my OS model, I've added solar collector in Hot Water Plant Loop and Energy Recovery Ventilator in OA Air Loop, however the energy generated or recovered by these two models are 0 in the final calculating results. I couldn't figure out why it happened. I wanna attach my OS file in attachments but I couldn't because of my low hierarchy. Could anybody help me find the problem. This is very urgent and thank you so much.

Do I have to use district heating or cooling to calculate building loads then replace them with water to water heat pump. Beginner's question, thank you so much.