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Dear all, I would kindly ask for an information please. While reading indoor VRF cutsheet e.g. slim duct unit , I have noticed that external static pressure rises while air flow drops?! I was expecting to see increase in flow when fan speed is increased (and thus, static pressure). E.g. 46Pa...

Thanks muchly.

All, I would kindly ask for an information please. Does anybody know where a simple piece of HVAC load calculation software (in excel for example) for a single zone building could be downloaded from? For example, something like Retscreen. Unfortunately, it does not calculate loads but energy...

Hi GMcD, Thanks for the prompt reply. Google can help a lot but not always as in this case. If not mistaken, many design guidelines including Viessmann's do not put much light on important issues such as stagnation or parallel vs serial tank connection or how to design large scale solar...

Dear all, I would kindly ask for information please. If possible, could I be referenced with sources of good design guidelines, schematics, free-of-charge software etc to design large scale solar water systems (both for domestic hot water and hydronic heating)? Please advise. Thanks muchly

hey heppa, you could also consider www.areforum.org it helped me a lot + http://www.usgbccolorado.com/resources/leed-studyguide.html + http://www.greenexamprep.com. The exam ( LEED NCv2.2, I do no know about v3) used to be very similar to green exam prep software. Hope this helps. Cheers

Thanks for your prompt reply. Unfortunately, our project has been canceled at the end of scheme design stage. I guess it is due to current issues in world economy.

Dear all, I would kindly ask for an information please... 1) Situation: Typical floor with staircase, lift lobby, studio apartment and garbage room. studio will be conditioned via Fan coils where fresh air is treated and supplied from air handling unit to back of FCU. FCU recircuates room air...

I c. Thanks for advices.

Thanks muchly.

Hi JohnBreen, Thanks for reply. That is my point...what code is applicable? Is there any 'on foot' calculation eclarification in applicable literature or free of charge software that can be used for completing the job? Thanks.

To cool the pool.

Dear all, I have been tasked to do stress analysis of secondary side chilled water piping to determine stress risk on plate heat exchangers (PHEX). Secondary side (flow 5.5C and return 14.5C) piping extends horizontally (from PHEX to risers) and vertically from risers, branches to each FCU on...

Dear all, I have been tasked to do stress analysis of secondary side chilled water piping to determine stress risk on plate heat exchangers (PHEX). Secondary side (flow 5.5C and return 14.5C) piping extends horizontally (from PHEX to risers) and vertically from risers, branches to each FCU on...

Dear all, I have been tasked to estimate cooling capacity for cooling outdoor swimming pool water based on : 1)WxLxDepth=5mx24mx1.8m. 2) Desired Swimming pool temperature is within range of 26C-29C. 3)MAx Ambient air temperature is 46C, high RH. 4) Make-up water temperature 26C Any...

Thx

Hi there Hirise Building, Rule of thumb for internal cooling loads: 1) small IT centres (90-150 W/sqm) 2) large IT centres (500-1000 W/sqm) The best approach is to get data from IT consultant as actual values depend on diversity. Hope this helps. Thanks

Hi DrWeig, Thanks muchly. Now, I realize that my approach is completely wrong resulting in oversized system. The trick is in smoke detector then. If CO>25ppm the system will start running and removing gasoline fumes (and smoke in case of fire eventually). I will design my system according to...

Dear all, Does anyone know what NFPA standard is related to mechanically ventilated underground garages? Any other reference is greatly appreciated. I have 2 level underground garage where fresh air is introduced via car ramp on ground floor. The idea is to size my system (ducting, 2 speed...

Hi, I am working on a project in Middle East. I would kindly ask for a reference (downloadable from the net)regarding district cooling substations (secondary loop,equipment selection, space allowances, schematics etc), design guidelines as well as guidelines for designing district cooling...