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Re: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
Ana Rui:
I ran the input file and could not repeat the warnings using the
PRT_BRAGANCA_IWEC.epw weather file specified in the input. However I found
some inputs which may cause the warnings.
The numbers of speeds for heating and cooling are 2 in the
UnitarySystem:MultiSpeedHeatPump:AirToAir object. The next four inputs
should be:
2.0833, !- Supply air volumetric flow rate during heating operation, Speed 1
{m3/s}
4.1667, !- Supply air volumetric flow rate during heating operation, Speed 2
{m3/s}
2.0833, !- Supply air volumetric flow rate during cooling operation, Speed 1
{m3/s}
4.1667; !- Supply air volumetric flow rate during cooling operation, Speed 2
{m3/s}
There is no need to input values for Speeds 3 and 4.
Your inputs are:
2.0833, !- Supply air volumetric flow rate during heating operation, Speed 1
{m3/s}
4.1667, !- Supply air volumetric flow rate during heating operation, Speed 2
{m3/s}
autosize, !- Supply air volumetric flow rate during heating operation, Speed
3 {m3/s}
autosize, !- Supply air volumetric flow rate during heating operation, Speed
4 {m3/s}
2.0833, !- Supply air volumetric flow rate during cooling operation, Speed 1
{m3/s}
4.1667, !- Supply air volumetric flow rate during cooling operation, Speed 2
{m3/s}
autosize, !- Supply air volumetric flow rate during cooling operation, Speed
3 {m3/s}
autosize; !- Supply air volumetric flow rate during cooling operation, Speed
4 {m3/s}
Two additional field inputs of autosize (Supply air volumetric flow rate
during heating operation, Speed 3 and 4) are recognized by E+ as cooling
flow rates. Since the inputs are autosize, E+ calculated flow rates as
1.18959 at Speed 1 and 2.37918 at Speed 2. The ratio of flow rate (1.18) to
the rated capacity at 42900 may be out of range.
By the way, E+ uses the flow rate in the
UnitarySystem:MultiSpeedHeatPump:AirToAir object at each speed. The rated
flow rate in the Cooling object is used to calculate flow fraction, which is
used to calculate flow fraction modifier.
Please delete autosize inputs. I expect the warnings may go away. At the
same time, I am going to revise the program to catch unmatched inputs.
Best regards,
Lixing Gu
----- Original Message -----
From: "anarui.oliveira" <anarui.oliveira@xxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Tuesday, June 17, 2008 12:33 PM
Subject: [EnergyPlus_Support] Re: Multispeed DX Cooling Coil
>I uploaded the file with the name "Loja2_cUnitaryMSHP". Thanks.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>>
>> Ana Rui:
>>
>> Please upload the input file. I am going to take a look.
>>
>> Thanks.
>>
>> Lixing Gu
>>
>> ----- Original Message -----
>> From: "anarui.oliveira" <anarui.oliveira@...>
>> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
>> Sent: Tuesday, June 17, 2008 11:06 AM
>> Subject: [EnergyPlus_Support] Multispeed DX Cooling Coil
>>
>>
>> > Hi.
>> >
>> > Why would a get the following error message:
>> >
>> > Warning ** COIL:DX:MULTISPEED:COOLING "ROOFTOP AHU DX COOLING
> COIL" -
>> > Air volume flow rate per watt of rated total cooling capacity is
> out of
>> > range at speed 1
>> >
>> > if
>> > - Rated Total Cooling Capacity at Speed 1 = 42900 W
>> > - Rated volumetric flow at speed 1 = 2.0833 m3/s
>> > i.e.
>> > ratio = 0.000049 (m3/s) / W ???
>> >
>> > Am I missing something?
>> >
>> > Thanks in advance,
>> > Ana Rui.
>> >
>> >
>> >
>> > ------------------------------------
>> >
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>
>
>
> ------------------------------------
>
> The primary EnergyPlus web site is found at:
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> Attachments are not allowed -- please post any files to the appropriate
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