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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...

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...

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

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...

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...

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...

Dear all, I would kindly ask for information please. Does anyone know in which USA code (e.g. NFPA, ASHRAE etc) I could find what is the min. distance between floor and MEP instalations in garages? Additionally, any similar experiences from UAE? Thanks muchly.

Dear all, I would kindly ask for an information please. What would be a suitable air temperature control in the outdoor tennis court located in hot and humid climate (Middle East)? What is the efficiency of such system? Any case studies? Besides fan forced outdoor air over a cooling coil, I do...

Hello, I would kindly ask you for an information regarding USGBC LEED Exam regarding the cost and genearal advices please. 1) From the www.usgbc.org I understand that total cost for exam ($350), a study book ($200). My concern is that I am not sure what study books should I purchase If I want...

Hello, I would kindly ask for some information regarding biofuels. 1) How much land under crops is needed for 1ton of biofuel (biodiesel, ethanol)? 2) Is there any thermal power plant built in the world that utilizes biofuels in boilers instead of oil, coil etc. 3) What is the energy...

Dear all, I would kindly ask for your assistance please regarding sizing pipelines for district cooling system, please. I have been looking for criteria that have to be met in order to size district cooling systems with parameters supply 7C and return 12C. Terrain configuration allows both...

Dear all, I would kindly ask for your assistance please. I am supposed to select appropriate heating/cooling strategy for luxury residential houses (130 sqm TFA each) located in a sea resort. I am thinking of using small fan coil units. What do you think about combination of underfloor heating...