RE: [EnergyPlus_Support] water heater

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, February 19, 2012 4:27 PM
Subject: RE: [EnergyPlus_Support] water heater

My comment is interleved below.

Dr.Li.

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, February 19, 2012 1:09 AM
Subject: RE: [EnergyPlus_Support] water heater

Change the 1000000 Watt to 90000 watt or smaller in the HeatingLoad object.

The tank temperature in the simulation may change in the 10 minute interval.
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Sediment in the water is only in the DHW tank. The DHW tank has drain pipel You clean as often as you like. It does not effect the boiler.

The water in the HW tank should be filtered and clean and is not affected by usage. Have you heard of de-ionized water?yes i know about de_ionized water but in some building in iran there is no de_ionized water for boiler usage ,

If you insist, then ask the help desk. You have not specify what furnace you are using and the tank shape. How is the EPlus to know how to calculate.

how i can specify furnace and tank shape of boiler in energyplus ?

You can take a picture of your system and ask the experts.

There is a conduction to the environment field, I am not sure whether it is in your choice below. In a boiler, the efficiency fields covers this loss.

PLR cannot be larger than Unity. If PLR is 1, your gas fire will not turn off.

The DHW tank has a lower temperature because the hot water pipe is not fully insulated, and it is connected to the cold water main. (See the diagram attached.)

Gas fire ignition delay may have nothing to do with your temperature. The tank thermostat will then turn on the starting signal first, the gas pilot will light, and then the main fire comes on. Energy Plus does not simulate the ignition delay. It is a only few second. The time step at 6 is ten minutes interval.

but in I/o ref page 585 : field:heater ignition delay , that is for water heater , but i want this field for boiler but there is not ,maybye it is not very important

If you that detailed in simulation, change the tank object that you are using. Ask the help desk on how to do this. I am not going to waste my time on this.

You are not even sure what type of heater or fire you have got. Your drawing shows a oil burner with fan anc injection feed. The gas fire is usually under the tank.

what you say!!! , i got natural gas i said it several times!!!! , where i show oil burner ???!!!!!!!!!!!!!!!!

I was commenting on your diagram. A gas burner is not drawn that way.

You can say whatever you want. As far as simulation is concerned, it does not matter what you say. The conversion is done at the point you provide the utilioty cost. I never bother about this, as it is not a requirement for energy saving research.

The 81 in the boiler design temperature means that the boiler will be operating at this temperature, on and off with a few degree difference. If you change this number the tank temperature or the loop temperature should change. Of cource, if you have other objects to control this, then it may not have effect.

Because the node names are different, I do not know which one is working.

The DHW control is on the second loop. It is not controlled, as you have a mixer on the tap. If you want to control this temperature, it can be added. It is called the tempering valve object.

You can monitor the tank water temperature change in the real system. However, you cannot change the real system temperature with the sensors.

You are a Master of ME and should know all these.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: t.t111ir@xxxxxxxxx
Date: Sat, 18 Feb 2012 20:48:44 +0000
Subject: Re: [EnergyPlus_Support] water heater

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