Petros Dalavouras's profile - activity

You are correct, it's for DHW so the discharge will always be above the critical point (31.1oC) thus the operation will

Since CO2 needs 2 pairs of curves (1 for subcritical and 1 for transcritical operation), he probably has to do 2 simulat

I don't think that the freezer is empty according to this paper. Taken from the paper: "The temperature fluctuation duri

What is the use of the cold room? I figured that since the temperature is -21°C/-18°C that it is used as a freezer for p

It could be an internal mass issue, have you checked that your constuctions and areas represent your stored products cor

As Denis mentioned, incident solar radiation can increase the temperature of your building. Add to that, interior loads

It probably is a sizing problem. Your water heater is not capable of providing the required energy to heat the water. Tr

This is true. A fixed Dew point cannot give a variable RH since DB is also a variable. That being said, what is your app

In order to have your free cooling running you need to go to your HVAC tab and select the OS:Controller:OutdoorAir of th

In order to have your free cooling running you need to go to your HVAC tab and select the OS:Controller:OutdoorAir of th

That's the economizer that you are describing with "FixedDewPointAndDryBulb" control found either in control sub tab of

What's your simulation tool?

Air loops are used in order to condition thermal zones. You should use the internal loads found in "loads" tab in order

I took a look at you screenshots and there are many things wrong with them. Firstly, you have a plant loop that has in t

As the error explains your temperature in your water fixture cannot be higher than the hot water that comes from your so

is air loop's " type of load to size on" set to ventilationrequirement?

Is it me or unmethours site feels a bit slow lately? Some questions take quite a while to open both from my phone and my PC

UnmetHours site feels slow Is it me or unmethours site feels a bit slow lately? Some questions take quite a while to ope

Assuming that you use air to reject heat and that you do not have a cascade system (CO2-R134a), CO2 has a low critical p

These four parts are essential in any vapor compression system so not just refrigeration but also HVAC systems. Having s

Have you checked this insted of air wall for option C?

You can check if this post is useful. Then see if this and this output are what you are looking for

More details are required about your system (terminal units, economiser, DCV etc.) and what exactly you need to hardsize

More details are required about your system (terminal units, economiser, DCV etc.) and what exactly you need to hardsize

This is quite a general question. I would suggest looking at the examples that come with energyplus installation to see

This is a quite a general question. I would suggest looking at the examples that come with energyplus installation to se

Haven't tried it myself but you could make a plant loop with the PlantComponent:TemperatureSource on the suply side

If you didn't want to leave the openstudio application interface, you could use the AddOutputVariable measure which you

On the thermal zones tab you can choose the cooling and heating sizing parameters subtabs. There you will find the Desig

On the thermal zones tab you can choose the cooling and heating sizing parameters subtabs. There you will find the Desig

I haven't tried it myself but I don't see a reason why energyplus would not handle CO2 with airchillers. In your case a

I haven't tried it myself but I don't see a reason why energyplus would not handle CO2 with airchillers. In your case a

I haven't tried it myself but I don't see a reason why energyplus would not handle CO2 with airchillers. In your case a

properties of the spectral data you obtained from WINDOW so as to create the table. In the Engineering Reference you can

I'm sorry I didn't grasp your question at first. So you need to use Optical Data Type = SpectralAndAngle. In this case I

Yes the units are off both for "flow per exterior surface area" and "flow per space floor area". However, if you export

You can use WINDOW from LBNL to model your windows and then export an .idf file with all the values you need both for av

Is the SetpointManager:MultiZone:Humidity:Minimum at NODE 136 as the .err suggets? This node should be the one after the

Given that your spaces are assigned with a space type, you can find the infiltration options at the "space types" tab un

In openstudio you cannot set directly the ground temperature however, you can use a measure if you want to change it. By