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2018-06-11 03:26:58 -0500 | marked best answer | EnergyPlus: dual thermostat doesn't work, system working towards lower temp. all the year round Hi guys, I got a hotel model (a FCU+PAU proposed model compared with LEED baseline) with dual thermalstat setpoint (22~24/25 generally) all the year round. Somehow the HVAC energy consumption is way higher than expectation. When I digging out the issue. It is found that some area are working towards the 22 degree C all the year round. For me it seems that the system overcools and then reheat but the setting are quite general that I have struggled for a while but just cannot find how to correct it. The Sensible Heat Gain Summary also shows something weird that 'HVAC Zone Eq & Other Sensible Air Cooling [kWh]' shows considerabily positive heat gain. I have a attached the schedule setting and also sensinble heat gain summary. Can anybody help to have a look what is going wrong? many thanks! Allison |
2018-06-11 03:26:58 -0500 | received badge | ● Scholar (source) |
2018-06-11 03:26:23 -0500 | answered a question | EnergyPlus: dual thermostat doesn't work, system working towards lower temp. all the year round After further compare the node supply temperature from DOAS and FCU. The reasons have been found. Turns out he PA/DOAS i |
2018-06-11 03:20:17 -0500 | commented answer | EnergyPlus: dual thermostat doesn't work, system working towards lower temp. all the year round hi I checked that in my model some shows throught 12/31 and some shows Through: 31 Dec. But after check hourly thermosta |
2018-06-05 05:16:01 -0500 | asked a question | EnergyPlus: dual thermostat doesn't work, system working towards lower temp. all the year round Energyplus: dual thermalstat doest work, system working towards lower temp. all the year round Hi guys, I got a hotel m |
2018-05-31 21:09:47 -0500 | commented question | Clarification needed - Report: Sensible Heat Gain Summary Hi, I am wondeirng if this problem has been saved as I encounters similar issue as in ur gains summary uploaded. I do no |
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2018-05-31 06:12:47 -0500 | answered a question | Clarification needed - Report: Sensible Heat Gain Summary Hi, I am wondeirng if this problem has been saved as I encounters similar issue as in ur gains summary uploaded. I do no |
2017-03-16 02:22:20 -0500 | asked a question | District Cooling System COP and Thermal Distribution Loss Dear all, Hi I am modelling building targeting LEED certification through eQUEST. The building itself is connected to a District Cooling System (DCS) with Ice Storage.According to "Treatment of district or campus thermal energy in LEED v2 & LEED 2009", a virtual plant can be modeled with some guided COP and thermal loss. While there are some questions I need to address. a) The COP of cooling plant shall be 4.4 including cooling towers and primary pumps. The COP4.4 sounds like a integrated COP value for the whole plant, not only for the chiller. But without the chiller type, pumps propeties, I have no idea how can I break it up and input into the energy model. I used to model the district cooling system based on actual design parameters. How can I then evaluate the plant COP? Divide the plant energy consumption by electricy used? 2) Input 5% thermal distribution loss for the District Cooling System. What I understood is that the thermal distribution loss is mainly presented through the temperature change, can I simply enter 5% of design dT for the supply loss DT? or just multiplying 5% to the energy consumption by space cooling? Did I miss anything? Any advice is much appreciated! Allison |
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2016-11-22 21:12:55 -0500 | commented answer | eQUEST Sim.file corrupt Thanks for the tips! Not sure how the sim viewer define the illegal character but my sim file has only english characters, and I even deleted the blank spaces to avoid this kind of problem. but the sim file corrupt still. So I am thinking my 'corruption' issue maybe caused by something I set in the detail input.. |
2016-11-20 19:49:02 -0500 | commented answer | eQUEST Sim.file corrupt I am still in the process of developing the model and now I got tons of process files now. Once I finished, I will sort out the problem files and send to the links you gave above, many thanks! Allison |
2016-11-20 19:46:29 -0500 | commented answer | eQUEST Sim.file corrupt Hi Nick, Thanks very much for the answer! I did upgraded to the new version 3.65 build 7173 for this model. When I encountered the 'sim file corrupted' problem, I had shifted the model to another computer with build 7158 and sim file corrupted still. All I did was deleting the dummy zone (OA system for FCU) system supply CFM at airside (in detail mode) and then the sim file can be opened in both 7173 and 7158 while without ES series results. It is glad to know the professional contacts for the eQUEST cause before all I had are two forums for posting questions.. Allison |
2016-11-06 19:32:50 -0500 | commented question | eQUEST Sim.file corrupt the eQUEST version should be the latest one that I redownloaded from the web last week. |
2016-11-06 19:31:32 -0500 | commented question | eQUEST Sim.file corrupt When the sim file corrupt, it can be opened by the notepad indeed. the sim file is 26.6MB and why I said it is solved 'a bit' is that I can now open the sim file with the simviewer,,,but somehow the ES series results are missing from the list. When I open it with notepad, I can find the ES series results : ( |
2016-11-06 19:30:53 -0500 | commented question | eQUEST Sim.file corrupt Dear Nick, Thanks for the advices. The problem has been solved 'a bit' though I am not sure why still. All I did was deleting the dummy zone (OA system for FCU) system supply CFM at airside. I guess the system cannot accept the individual zone OA input and OA sum input at OA system at the same time? but I have done this before, it was okay.. |
2016-10-31 20:57:33 -0500 | commented question | eQUEST Sim.file corrupt ah I see. thanks! |
2016-10-31 19:55:56 -0500 | received badge | ● Editor (source) |
2016-10-30 22:28:31 -0500 | asked a question | eQUEST Sim.file corrupt Not sure if anyone encountered this before that I cannot open the sim file with all previous steps run fine. I open the file okay, run it okay, and when I try to open the sim file, it shows that 'The file XXXX.sim, is corrupt'. I tried open it with notepad, and correct some warnings it shows and run again... but still... it said the sim file is corrupt and I just cannot open it with the simviewer.... Any help or tips is much appreciated, thanks!! Allison |
2016-09-27 20:05:58 -0500 | commented answer | eQUEST_4-Pipe FCU system with ASHP(heating) and chiller(cooling) Dear Anna, Yes I have checked the heat pump at zone level. The problem is that the zone level HP is air-to-air HP while mine are central air-to water HPs. Not sure how big difference it will cause, one first thing is that I cannot then define the hot water supply and return temperature with zone HP. |
2016-09-26 20:10:51 -0500 | commented answer | eQUEST_4-Pipe FCU system with ASHP(heating) and chiller(cooling) 2) I tried the equipment control with chillers defined as priority and heat pumps as the least. While since the chillers and heat pump is not in the same circulation loop, and based on the software help session that only equipment in the same loop can be driven by the control sequence. The result did not change before and after I set the equipment control, it seems that the equipment control does not help. |
2016-09-26 20:10:28 -0500 | commented answer | eQUEST_4-Pipe FCU system with ASHP(heating) and chiller(cooling) Hi, Thanks for your advice! I did try as you metioned,,see below. 1) I define the heating and cooling schedule based on the heating and cooling load in the hourly report. so basically when there is a heating load, the heating schedule (on/off/temp) will be defined as 'on' and cooling schedule as 'off'. |
2016-09-26 12:09:06 -0500 | received badge | ● Student (source) |
2016-09-26 08:07:52 -0500 | asked a question | eQUEST_4-Pipe FCU system with ASHP(heating) and chiller(cooling) Dear all, I am modelling a hotel with system through eQUEST as below, •System: 4 -pipe FCU with seperate OA induction (dummy zone has been built to model the OA induction unit) •Heating source: air source heat pump •Cooling source: water cooled chiller I encountered two problems: 1.As the ASHP can only be constructed in water side by selecting a chiller type as heat pump and attached to a 2-pipe circulation loop. I found that ASHP is supporting both heating and cooling for the building though the cooling source has been selected as chilled water loop at air-side. This does not comply with the design intention and do no good for energy conservation since the chiller has higher COP than the ASHP. 2.Another problem is that the 2-pipe circulation loop lead to some overheating unmet hours during winter when there is both heating and cooling load, even the system itself is a 4-pipe one. I tried to set the heating and cooling schedule for the heat pump loop but somehow it gives me a 99.99% unmet when I turn off the cooling for heat pump loop. Only certain load is charged from the chilled water loop though the chiller capacity is autosizing at present... I m totally stuck here, and wondering if anyone got any experience like this? any tips or advice is much appreciated, thanks in advance! Allison |