Search results for query: *

Dear sirs: If an anechoic chamber was for sound isolation, inside noise level should be below 20 decibels. Is the same requirement mandatory or advisable for RF anechoic chambers? What is the noise level usually recommended? Thanks schola

Dear sirs Acoustic anechoic chambers require noise levels as low as 20- 10 db. These noise levels have to be applied to Radio-frequency anechoic chambers also? Tanks and regards schola

Dear sirs: I am Mechanical Engineer working in Air Conditioning project. In order to conclude a preliminar cooling looad estimation, for a room containing a 100 KVA digital broadcasting transmissor, I need estimate how much heat that kind of equipment realease to the surrounding space. Could...

Dear friends: I´m estimating cooling load for 100 KW broadcast transmitter room. Do you have any index I could use for estimate heat rejection from the transmitter? Thanks, schola

Dear friends: SMACNA and terminal devices manufacturers literature I have consulted advise TL50/L and max. ADPI for Circular Ceiling Difussers. Do you have such an information for Rectangular Ceiling Diffussers?. Thanks in advance, schola

Dear sirs: Different Desing Dlta T are frecuently or advisable, as this case i have found: Primary Delta T. 12.00 ºF, Secondary circuit: 10.00 ºF. ? Regards, schola

Dear sirs: Do you know Noise levels and/or dbA of typical Horizontal Centrifugal Frame Mounted Chilled Water Pump. HP = 7.50 - 10.00 HP? Thanks in advance. schola

Dear sirs, In accordance to NFPA-20, hose valves shall be installed for pump testing. What could be the advisable time the pump test should last? Regards, schola

Dear sirs: Do you know a good literature gealing with HVAC desgign for Broadcasting Studios?. Thaks in advance, schola

Dear friends: Do you know where can I get information and detail about riser support decribed before? The riser runs inside vertical masonry chase. Thanks in advance, schola

Dear sirs: I use to specify ASTM A53 Gr. A or B for chilled water pipes 3" diameter or mayor. What kind of problems could be arise is ASTM A-120 theraded pipe is used in lieu of A-53 carbon steel, diameters 3" to 6"? 8"? Thanks, schola

Dear sirs: Do you know any standard or basic practice in order to specify spans for insulated cw copper pipe support?. I am using Type L, diameters 1/2 to 2.1/2 inches. Thanks, schola

Dear sirs: I've been estimating chilled water cooling coil "delta P", finding very diffferent values among common manufacturers ( DataAire (45 ft H2O), Liebert (10 ft), , APC(20 ft). for the similar equipment Do you have a rough or practical standard value? Regards, schola

Dear sirs, I am specifiacting M Hard Copper Tubing for chilled water system. My question deals with choicing of fittings. What do you think is the most advaisable: Cast brass? wrought copper? wrought brass? Soldered, threaded? Working pressure will be 90#. Thanks in advance. schola

Dear friends: I am designing an HVAC system requiring 30% (volume)ethylene glycol/ or propylene glycol water solution. Do you know any water glycol pump manufacturer reated to this kind of cooling system? Cooling water flow is 72 GPM, head 110 ft. H2O. temperature 54.00 ºF Thanks in advance...

Dear friends: I am estimatig heat dissipation from laboratory equipment to be used to oils analisys. Do you know any literature dealing with heat dissipation of the kind of these equipment? Thanks Schola

Dear sirs: Do you have any detail or decsription about running of underground chilled water piping. My concerns deal with the kind of protection of the insulated pipes. Thanks in advance, schola

Dear friends: Do you know factories as Carrier, Trane, York, etc, manufacturing split equipment working with refrigerant different to R-22, R-12 or any CFC , in nominal capacities from 3.00 to 15.00 TR? Thanks, schola

Hi friends! I have been asking me about what practical is controlling internal positive room pressure using arrangaement composed by Internal Pressure Sensor (as Magnahelic) + modulating motorized damper. How quick is the control response? Is a realiable design? Wath level of precise control...

Dear friends: I am designing a classroom HVAC System where the client previews install floor/ceilng minisplit systems instead a ducted split unit. The room is 8.00 TR Thermal Load and will have twenty PC. I am not sure that use minisplit systems is advisable, because of their lack for: 1.-...