There are many components in an old system that is very efficient.
You do not see or use a thermostat in the room, it is because the user is the termostat. There is manual valve on the radiator. Some of them are calibrated in temperature or just an marker. The occupant will adjust that to suit their comfort. I do not know why we talk about energy saving and yet want to throw away all the cost saving system. There is no need to have VAV VRV HVAC system. Most of them are not energy efficient. I now understand why most new users are using the VAV tmplate and VAV zone equipment, because that was in the Gertting Started exercise. =============================== For T.T's IDF, you can remove the first two objects on availabilityManager:.. . They will not work as you intended. Have a closer look at your Iran system. You may be still missing some good features. In the real system, the pump by-pass has a non return valve. When the pump is working the pipe is closed. When the return water temperature falls to below the set point, the pump is stopped, and the water flows through the by-pass. In the London furnace, there is a safety valve with steam whistle. The water temperature is controlled by chimney damper setting and the fire air inlet size. Again, there was no thermostat. When the temperature is too high, all occupants would notice and would go to the furnace to shut it down, or call the attendant. No thermostat, does not mean that there is no control. Dr. Li. To: EnergyPlus_Support@xxxxxxxxxxxxxxx From: t.t111ir@xxxxxxxxx Date: Fri, 27 Jan 2012 22:09:44 +0000 Subject: Re: [EnergyPlus_Support] availabilityManager:High temperaturTurnoff yes exactly we use pump by bypass mode . what do you mean by different algorithm?
From: YuanLu Li <yli006@xxxxxxxxxxx> To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx> Sent: Friday, January 27, 2012 10:24 PM Subject: RE: [EnergyPlus_Support] availabilityManager:High temperaturTurnoff If you turn on and off the pump at 65°C, to implement the pump by pass mode. Again, it is a different algorithm. Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx From: t.t111ir@xxxxxxxxx Date: Fri, 27 Jan 2012 18:43:08 +0000 Subject: Re: [EnergyPlus_Support] availabilityManager:High temperaturTurnoff i want to :
if inlet water pump > 65C then pump will be off
and if inlet water pump < 65 then pump will be on
for this type of controling can we use two availabilityManager:
one availabilityManager:High temperaturTurnoff :for inlet water pump > 65C then pump will be off .
and another availabilityManager: low temperaturTurnon : for inlet water pump < 65 then pump will be on.
is that right?
thanks
From: Richard Raustad <RRaustad@xxxxxxxxxxxx> To: EnergyPlus_Support@xxxxxxxxxxxxxxx Sent: Friday, January 27, 2012 8:12 PM Subject: Re: [EnergyPlus_Support] availabilityManager:High temperaturTurnoff The availability manager actually turns off the pump (or fan for air systems). So any equipment on that loop will be off. On 1/27/2012 11:25 AM, Tooran T wrote:
-- Richard A. Raustad Senior Research Engineer Florida Solar Energy Center University of Central Florida 1679 Clearlake Road Cocoa, FL 32922-5703 Phone: (321) 638-1454 Fax: (321) 638-1439 or 1010 Visit our web site at: http://www.fsec.ucf.edu UCF - From Promise to Prominence: Celebrating 40 Years
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