RE: [EnergyPlus_Support] water heater

See reply in Blue background.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: t.t111ir@xxxxxxxxx
Date: Sat, 18 Feb 2012 14:39:08 +0000
Subject: Re: [EnergyPlus_Support] water heater

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Saturday, February 18, 2012 4:47 PM
Subject: RE: [EnergyPlus_Support] water heater

For T.t: If you are referring to the same project. The answer is yes and no.

Dear Dr.Li

the building that i have modeled there is boiler that has tank ,how can i simulate it? i think the boiler onject in energyplus there is no tank ,

if it is right how i can simulate this?

HW loop is a class in the program. water heater is an object in a class.

The radiators are branch objects connected to the HW loop and not to a water heater, but may be a water heater tank. what you mean by may be a water heater tank? As I said before, you have to use the name and meaning of EPlus.

Radiator is a the same as a water coil, but it radiates heat in a Zone directly. It is branch of the water loop and is therefore part of the loop as a water heater tank.

Heater is the fire, the heating source, the heating element.

There are many water heater types, electric, gas, oil, etc. It is a boiler in the HW Plant Loop.

Water heater tank is a storage tank, (and need not have any volume, instantaneous tank.)
you mean when tank voulme is zero then it is tankless ( instantaneous tank) and if its tank volume is not zero then it is storage tank?

I am sure you have seen a small electric water heater which can be connected in line with a shower. The element is immersed in water, but the water volume is so small, the water flowing through the pipe is heated up instantaneously. As soon as the water stops, the element is switched off. You can also set a maximum temperatur.To simulate this, you use a tank with very small volume.

ALL OBJECTS IN CLASS: WATERHEATER:MIXED ===========

WaterHeater:Mixed,
Indirect Water Heater, !- Name
AUTOSIZE, !- Tank Volume {m3}

Leave it as autosized, as you do not know the size of the tank nor the furnace. After the simulation, you can find the size used from the .EIO file.

if i put zero in tank volume , then water heater will be with out tank storage, yes? May be zero is too small, as it must wrap around the electric heater.

That is why I suggested that you need to learn the names from the EPlus manual and not from the Wiki link.

The DHW tank can be part of the same HW loop, to get the heat source from one boiler, but the water is not in the same HW loop, because the hot water loop for radiator does not want to be connected to the water main water.

HW is a closed loop. The water is circulated to the coils, radiators, and heating coils.

In DHW (domestic HW) the inlet to the tank is the water main cold water the outlet is to the tap and used and then to the drain (sewer). The EPlus objects are different for the shows, etc.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: t.t111ir@xxxxxxxxx
Date: Sat, 18 Feb 2012 10:30:00 +0000
Subject: [EnergyPlus_Support] water heater

can i use water heater to inculde hot water for radiator ?

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Primary EnergyPlus support is found at: http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx The primary EnergyPlus web site is found at: http://www.energyplus.gov The group web site is: http://groups.yahoo.com/group/EnergyPlus_Support/ Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files. EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

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