Recent content by relaxjack

Thank you all for reply. [pipe]

Hi guys. Can any pump expert tell me what will be the implication of having a suction line like the one shown in attachment? Thank you.

Oops. Here are the instruction on the manual. Set the status of the pump to CLOSED. At the suction (inlet) node of the pump add a demand equal to the required pump flow and place a negative demand of the same magnitude at the discharge node. After analyzing the network, the difference in heads...

I came across this instruction in Epanet Manual on "How to size a pump to meet a specific flow". After going through the procedure in the program, i ended up with an unusually high hydraulic head value at the discharge node. Could it be that i have misinterpreted the instruction?

Thanks for explanation Abby.

Abby: After studying your link at http://i32.photobucket.com/albums/d41/a_bee_normal/Malaysia_MCC.jpg I have a question. 1) The calculated Cooling Load of 22,249 BTU/Hr @ 749 CFM should also be the minimum capacity of air-conditioning unit required?

Many thanks to abby, quark & abcmex for taking time to reply this thread. I apologize for the lack of info as i wasn't the one who get to meet and discuss with the Client and Plant Specialist. My superior who went there was as clueless as me if not worst. The limited info were conveyed to me...

if i were to use pressurize the room with outside air, would i need a filter to stop dust and particles from being sucked in? if so, what kind of filter is normally used? howabout those filter that are normally used in a AHU unit?

Thanks again Abby. Your help is very much appreciated. will take a look at the example and talk to my Client again.

The 85% RH ambient plant condition and the required 45% RH for MCC Room is actually given by the fertilizer plant specialist from India who were going to install all the equipments. It was based on their experience according to them. hmm... seems like i'll need to have a discussion with them...

Your friend must be having a good holiday around those places. LOL. On the sensible heat load, electrical heat gain from the switchboard would be about 10,243 BTU/Hr. Assume that infiltration and occupant load is negligible, what other load should i consider as sensible load? Correct me if...

almost forgot. howabout the CFM of the A/c unit?

Im from Malaysia and its basically hot and humid here. so if i were to size an air-cond unit, the btu/hr of the unit should be equivalent to the [rate of sensible heat transfer + rate of latent heat transfer] in changing the temp + RH of the mixed air to desired room temp. + RH ?

Thanks a lot for your help Abby. What would most likely be the source of latent heat? could it be the 10% of outside air intake by the air-conditioner? The switchgear should be the largest contributor of the sensible load right? Also, you're saying that i should size the air-cond. unit based...

The Client has proposed to install split air-conditioning unit in the MCC rooms of a fertilizer factory for the purpose of cooling as well as dehumidifying the space to avoid dust and particles + water in the air to attach itself to the switchboards and therefore affect the insulation. My...