Re: [TRNSYS-users] Total heating demand

[王洋 <wanghongyang1767@gmail.com>]

Dear all,

 Happy new year!

 I have a question about calculating total heating demand:

There is one same room to keep indoor temperature as 20°C one day 24 hours, the initial indoor temperature is 20°C, there is no infiltration no other internal gains in the room. I used 3 different methods to calculate total heating demand of one day, separately.

1.First is heating in TRNBuild: after using the INTEGRATOR TYPE 46, the QHEAT is about 34314 kJ.

2.Second is floor heating(active layer): after using the INTEGRATOR TYPE 46, the QALFL_Inlet is about 33680.7kJ.

3.Third is still floor heating(active layer): after using the INTEGRATOR TYPE 46, but I used Q=CwaterMwater(Tinlet-Toutlet), the result of Q is 144639kJ.

My question is: 1) To 2 and 3: Why is the difference is so large? 3 is almost 4 times than 3? I will get the total heating demand, which one is right? Why? What's different of both of them?

2) If 3 is right. Generally, the floor heating should be more energy-saving than common heating. But here result is absolutely opposite. The common heating is more energy-heating. Why? Here what difference of common heating and floor heating?

Many thanks!

Br.

wang

在 2011年1月5日 下午2:38，王洋 <wanghongyang1767@gmail.com>写道：

Dear all,

 Happy new year!

 I have a question about calculating total heating demand:

There is one same room to keep indoor temperature as 20°C one day 24 hours, the initial indoor temperature is 20°C, there is no infiltration no other internal gains in the room. I used 3 different methods to calculate total heating demand of one day, separately.

1.First is heating in TRNBuild: after using the INTEGRATOR TYPE 46, the QHEAT is about 34314 kJ.

2.Second is floor heating(active layer): after using the INTEGRATOR TYPE 46, the QALFL_Inlet is about 33680.7kJ.

3.Third is still floor heating(active layer): after using the INTEGRATOR TYPE 46, but I used Q=CwaterMwater(Tinlet-Toutlet), the result of Q is 144639kJ.

My question is: 1) To 2 and 3: Why is the difference is so large? 3 is almost 4 times than 3? I will get the total heating demand, which one is right? Why? What's different of both of them?

2) If 3 is right. Generally, the floor heating should be more energy-saving than common heating. But here result is absolutely opposite. The common heating is more energy-heating. Why? Here what difference of common heating and floor heating?

Many thanks!

Br.

wang

2011/1/4 <trnsys-users-request@cae.wisc.edu>

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Today's Topics:

  1. optimization problems using trnopt in Windows 7 OS (Dapeng Li)


---------- 已转发邮件 ----------
From: Dapeng Li <jiap1120@gmail.com>
To: TRNSYS-users@cae.wisc.edu
Date: Tue, 4 Jan 2011 18:00:38 +0100
Subject: [TRNSYS-users] optimization problems using trnopt in Windows 7 OS
Dear all,

I want to do optimization using trnsys, trnopt and genopt in Windows 7 OS. But when I run the example in the directory of "C:\Program Files\Trnsys16_1\Optimization", I got a error message in Genopt interface that is enclosed in the attachment. 

The version I use is listed below: TRNSYS version 16.01.0003, trnopt version 2.1.0.52, genopt version 2.1.0 June 18, 2008.

PS: I ever did optimization in XP OS, and it work well. 

Thanks in advance.

With kind regards,

Dapeng Li

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