intermittent pump with plant temperature too hot
Hi,I am running a low temperature radiant & Outdoor air unit system. My pumps are Intermittent.but I also have the severe :
* Warning * In calculating the design coil UA for Coil:Cooling:Water ZONE1 COIL COOLING * ~~~ * no apparatus dew-point can be found for the initial entering and leaving conditions; * ~~~ * the apparatus dew-point is below the coil design inlet water temperature; * ~~~ * the coil outlet design conditions will be changed to correct the problem. * ~~~ * The initial design conditions are: Tair,in = 24.1715 * ~~~ * Wair,in = 9.000000E-003 * ~~~ * Twater,in = 6.7000 * ~~~ * Tair,out = 16.0000 * ~~~ * Wair,out = 4.000000E-003 * ~~~ * The revised design conditions are: Tair,out = 9.4156 * ~~~ * Wair,out = 6.646584E-003 *** Testing Individual Branch Integrity *** All Branches passed integrity testing *** Testing Individual Supply Air Path Integrity *** All Supply Air Paths passed integrity testing *** Testing Individual Return Air Path Integrity *** All Return Air Paths passed integrity testing *** No node connection errors were found. *** Beginning Simulation * Warning * ZoneHVAC:LowTemperatureRadiant:VariableFlow [LOW_TEM_RAD_VAR] * ~~~ * Surface [ROOF] temperature below dew-point temperature--potential for condensation exists * ~~~ * Flow to the radiant system will be shut-off to avoid condensation * ~~~ * Predicted radiant system surface temperature = 16.81 * ~~~ * Zone dew-point temperature + safety delta T= 23.22 * ~~~ * Environment=CHANGSHA ANN CLG .4% CONDNS DB=>MWB, at Simulation time=07/21 00:00 - 00:10 * ~~~ * Note that a -0.5000 C safety was chosen in the input for the shut-off criteria * ~~~ * Note also that this affects all surfaces that are part of this radiant system * Warning * GetDensityGlycol: Temperature is out of range (too high) for fluid [WATER] density * * ~~~ * ..Called From:PlantPumps:CalcPumps: ,Temperature=[100.00], supplied data range=[0.00,100.00] * ~~~ * Environment=RUN PERIOD 1, at Simulation time=02/13 13:50 - 14:00 * Warning * GetSpecificHeatGlycol: Temperature is out of range (too high) for fluid [WATER] specific heat * * ~~~ * ..Called From:PlantLoopSolver::EvaluateLoopSetPointLoad,Temperature=[125.00], supplied data range=[0.00,125.00] * ~~~ * Environment=RUN PERIOD 1, at Simulation time=02/27 22:00 - 22:10 * Severe * Plant temperatures are getting far too hot, check controls and relative loads and capacities * ~~~ * Environment=RUN PERIOD 1, at Simulation time=08/01 23:40 - 23:50 * ~~~ * PlantLoop Name (SupplySide)= HOT WATER LOOP * ~~~ * PlantLoop Setpoint Temperature=60.0 {C} * ~~~ * PlantLoop Inlet Node (SupplySide) does not have a Setpoint. * ~~~ * PlantLoop Inlet Node (DemandSide) does not have a Setpoint. * ~~~ * PlantLoop Outlet Node (SupplySide) has a Setpoint. * ~~~ * PlantLoop Outlet Node (DemandSide) does not have a Setpoint. * ~~~ * PlantLoop Outlet Node (SupplySide) "HW SUPPLY OUTLET NODE" has temperature=270.0 {C} * ~~~ * PlantLoop Inlet Node (SupplySide) "HW SUPPLY INLET NODE" has temperature=270.0 {C} * ~~~ * PlantLoop Minimum Temperature=2.0 {C} * ~~~ * PlantLoop Maximum Temperature=70.0 {C} * ~~~ * PlantLoop Flow Request (SupplySide)=0.0 {kg/s} * ~~~ * PlantLoop Flow Request (DemandSide)=0.2 {kg/s} * ~~~ * PlantLoop Node (SupplySide) "HW SUPPLY OUTLET NODE" has mass flow rate =0.2 {kg/s} * ~~~ * PlantLoop PumpHeat (SupplySide)=6422.6 {W} * ~~~ * PlantLoop PumpHeat (DemandSide)=0.0 {W} * ~~~ * PlantLoop Cooling Demand=172100.2 {W} * ~~~ * PlantLoop Heating Demand=0.0 {W} * ~~~ * PlantLoop Demand not Dispatched=0.0 {W} * ~~~ * PlantLoop Unmet Demand=-172100.2 ...
