The reason is that HAP, for the non-summer-months has values hell above the reality.By excluding those months for the cooling calculation, we are setting aside the possibility that the peak condition will occur(wrongly)in a non summer month.
Here´s what HAp online says:
Design Cooling...
Paulo:
Boy, you're so far from "home"!
Como é que é para um português, viver na China?
I'm gonna try to follow your tips about the AC instalation.
You may very well be right.
Cumps para ti de
Vítor,
Lisboa, Portugal.
I've read the explanatio about the way HAP "do the numbers".
It´s now clear to me,why a daily profile of temperatures is necessary.
However for my climate, perhaps the best ideia is to select only Jun, Jul and Aug months, in the first tab of the "Design parameters" tab. I'm sure the cooling peak...
I decided to start a new post for this question, with a title more adequate about what we are discussing.
Hope is OK for you.
As far as I understand, this “hourly detail view” is only to calculate the peak coolling loads(am I wrong?), because to do a simulation for the 8760 hours of the year...
Still about the weather hourly data profiles in HAP:
I still don’t understand why we need the hourly data profiles to calculate cooling loads.
In HAP help menu:
...[i] Design Temperatures Tab / Weather Form[i/]
About Design Temperature Data. The Design Temperatures tab contains information...
AEBuck:
I´ve downloaded the report on the link you gave me. It’s very good allright. However I couldn’t retrieved the meteo data I’m interest in (Lisbon, Portugal).
I followed the instructions on the page 62 of the report:
1. Access http://www.afccc.af.mil.
2. If you are using a computer...
For those who (like myself), were looking for some help in hydronic system design and balancing, this link might me a good start(it's from the Swedish manufacturer TA):
http://www.tahydronics.com/
See under the tab "Tools"
SLB
I haven't performed a calculation yet, so don´t have the water flow figures in each branch, or rise.
You talk about variable flow, so I presume you are considering 2 way valves in each coil.
The instalation were I work as 40 fan coils each with a 3 way valve. The water flow is costant.
Don´t we...
Thanks for your tips.
I've read Carrier's papers, and tried Carrier's HAP 4.1 program in a fiends computer, however, we still didn't find out how to generate the 8760 hour report, were we are suposed to see the loads in a hour-by-hour basis, space by space for the entire year.
We tried the HELP...
When we estimate (or calculate) the cooling loads of a series of spaces located in several facades, we obtain the peak load for a certain hour of the day.
However, it's posible that not all the spaces have a peak load at that hour of day.
In that case the peak load, may not be the sum of the...
As far as I know, there is no possibility to implement an automatic ECWT reset strategy.
The possibility of a set point reset strategy is not implemented in the computer witch manage the AC system, but I’ll investigate if it can be implemented.
We have to go the chiller and manually reset the...
Again, thank you all for your help.
At present the ECWT as a 9ºC set point.
The first band value is 10ºC and the second is 11.5ºC, i.e.when ECWT reaches 11.5ºC the second compressor(lets call it this way), starts and we have 2 compressors working.
After a while the ECWT, falls and at 10ºC the...
lilliput1:
Thank you for your tip.
More details about the Chiller:
The Chiller has a controler with a interface were you can visualize several parameters: ECWT, LCWT ...
You can define a set point in the LCWT and for sure in the ECWT. However I don't know the code number witch define the...
Where I work, we have an HVAC sytem with a single air cooled Chiller.
The Chiller as two identical COPLAND reciprocating compressors.
The Chiller capacity is controlled via the demand side.
We can only establish a set point in the entering water not in the leaving water.
With this strategy...
