First time here? Check out the Help page!
2021-12-21 09:32:13 -0500 | commented answer | Modelling a gas absorption heat pump in EnergyPlus How about now?? |
2020-11-04 06:32:00 -0500 | commented question | thermal simulation of complex fenestration in energyplus What do your SHGCs look like? Check it in the Exterior Fenestration section of the html |
2020-11-04 06:03:51 -0500 | commented question | thermal simulation of complex fenestration in energyplus What do your SHGCs look like? |
2020-11-04 04:21:02 -0500 | commented question | thermal simulation of complex fenestration in energyplus Did you export the idf code from WINDOW? Are you just looking at glazing u-values, not considering frame? Are perhaps th |
2020-11-04 04:18:10 -0500 | commented question | thermal simulation of complex fenestration in energyplus Did you export the idf code from WINDOW? |
2020-11-04 04:15:54 -0500 | answered a question | Radiation configuration in atriums Maybe you could cheat. The reflected part of the radiation on the flood will be distributed area weighted on the remaini |
2020-11-03 09:14:58 -0500 | commented answer | What are appropriate values for Temperature and Loads Convergence Tolerance? Are these tolerances only used in warmup or also in simulation? I'm struggling with AirFlowWindows... |
2020-11-03 01:35:49 -0500 | answered a question | What are appropriate values for Temperature and Loads Convergence Tolerance? Are these tolerances only used in warmup or also in simulation? I'm struggling with AirFlowWindows... * Severe * Conve |
2020-10-26 05:11:48 -0500 | received badge | ● Supporter (source) |
2020-10-23 04:17:56 -0500 | asked a question | GetSpecificHeatGlycol: Temperature is out of range error with loops when there's no glycol in the loop GetSpecificHeatGlycol: Temperature is out of range error with loops when there's no glycol in the loop Hi Guys, (sorry f |
2019-11-18 04:22:59 -0500 | received badge | ● Popular Question (source) |
2015-12-10 06:08:32 -0500 | answered a question | Infloor Radiant Heat in the idf you can leave certain fields blank. this should be readible in the idd file and the ioreference. |
2015-11-24 13:57:48 -0500 | commented question | Best output:variable for zone heating / cooling load Also check the heat balance table in the allsummary report for clues on the migration of heat to and from the zone. |
2015-11-24 10:59:54 -0500 | answered a question | Best output:variable for zone heating / cooling load Sounds correct. It should report the average for the reporting period specified, i.e. hourly. Perhaps these are better for duel setpoint thermostats with deadband: Zone Predicted Sensible Load to Heating Setpoint Heat Transfer Rate [W] Zone Predicted Sensible Load to Cooling Setpoint Heat Transfer Rate [W] You could try... |
2015-11-15 11:15:20 -0500 | received badge | ● Student (source) |
2015-11-15 07:44:34 -0500 | asked a question | underground parking temperatures What temperatures are expected in underground parking facilities underneath the main building? In Berlin, Germany, I did a external CFD analysis of the ramp and opening of such an underground facility with different wind directions, temperatures outdoor, wind speeds, ect. My conclusion was that the air change rate was roughly 2-3 ACH depending on summer or winter and that the actual penetration of air was not very deep into the underground. High exchanges were at the ramp, but deep inside there was not much moving. In this facility there where technical rooms generating heat in the perimeter spaces of the parking area. I ran an annual simulation in TrnSys using the ACH from the CFD simulations to estimate the temperatures resulting in the parking area. I came to 10-12 deg C, roughly in winter when outdoor temps were about 3-4 deg C. The 24 hr variance was very low (almost flat line) in winter and only about 4 deg C in summer. Although Berlin does have its hot days, the yearly temps are about 10-12 deg C and even in summer only about 18-20 deg C. I believe that modelling (that's UK English for modeling) of underground parking spaces as "adjacent to outdoors" is a bit overkill. I think modelling it as a space with a infiltration rate of 2-3 ACH is more realistic. Obviously, I consider the "depth" of the underground area relative to the ramp opening. What are your experiences? |
2015-10-02 04:35:01 -0500 | answered a question | Water-side Economizer - ECWT The economizer loop should shut off at high outdoor temps. the fluid cooler must be sized to be able to deliver the minimum at design conditions. |
2015-10-02 03:44:47 -0500 | answered a question | Water-side Economizer - ECWT Can you please post a schematic of your system. |
2015-08-13 12:35:32 -0500 | received badge | ● Teacher (source) |
2015-08-13 12:33:40 -0500 | answered a question | cost function energyplus EnergyPlus tries to emulate real world systems in a way consistent with the time step granularity most often used in annual simulations. Equipment controls are setup using objects that allow the user to emulate "normal" control strategies. For example, an economizer has several control options to either use enthalpy limits, drybulb, or, or, or. Another example are the plant sequencing objects to control for example multiple chillers. Finally, EMS can deliver building management level or extra special control where required (and much much more). If you set a space to be for example cooled to a setpoint, all equipment will strive to reach that setpoint within the limits of each of the equipments. However, you could write an EMS to slide the set points dynamically to optimize the systems. Some equipments may have this kind of control captured in other ways such as lag times, or performance curves. If your goals are very equipment performance heavy, you may have to consider alternative programs like TrnSys and program your own modules for controls and components. Controls in TrnSys must be largely setup by the user. Far more difficult but more flexible and often transparent (at least to the person setting it up). The downside is that many "assemblies" need to be setup from scratch, so the first time user invests a lot of time just building subassemblies and assemblies for equipment plants and their controls. To make subassemblies and assemblies more reusable, considerable time is invested making control components like PID controllers scale with equipment capacities. Two other down sides are that there are no autosizing options and most reporting must be user defined. |