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Primary/Secondary chilled water system pumping The traditional primary/secondary pumping system is variable secondary pumps and fixed speed primary pumps with a decoupling line between Can you have variable speed primary pumps whereby the chilled water flow rate through the evaporator varies...

Hello I have a boiler system in my factory running at 7 bar. I have a new user requiring 1,000Kg/hr of steam at 2 bar. I will have to install a pressure reducing station to drop from 7 bar to 2 bar. My question is will my boiler be delivering an extra 1,000kg/hr at 7 bar or will it be a...

Hello If I have a 10,000 kg/hr steam boiler but only run it at say 7 bar, is there a formula I can use to de-rate the boiler output to calculate its revised capacity in Kg/hr Regards R

Hello, Does anyone have a genuine control strategy to control and maintain minimum outside air on a VAV system? Thanks!

I am upgrading an existing air handler and its BMS controls that is about 15-18 years old. The air handler looks pretty typical for Pharma with full fresh air, filters, heating coil, cooling coil and fan with zone reheats. Because the %RH requirements for the space are low, humidity 30%, they...

Hi , I am looking for an actuator to work in a fire type situation for auto and manual control through a control panel The actuator is to be both modulating when in auto and on/off(open/closed)when in hand at the panel The actuator will be spring return and with power on it 24 V it will open...

Hello I have an air handling unit with a new steam to steam humidifier. The humidifier is fairly basis and maintains the room level humidity set point pretty good. Only thing is it sometimes sets off the smoke alarm in the supply duct and even in the rooms. Any tips for getting residual steam...

I have an air handlig unit that has a fixed outside air damper and a fixed return air damper. Outsdie temps vary from -5 to 25 dgeC so I want to add economy cycle control to the unit. I will install an entalphy sensor outside and one on the return air duct. If the return entalphy is greater...

Hi I am installing a heating coil directly in front of a centrifugal fan outlet in an air handler. I want to disperse the air before it hits the coil with a perforated plate infront of the fan. Does any one have informaiton or tech data on the idean distance between the fan and perforate plate...

I work in a facility with dozens of air handlers and fans. If one of the buildings goes into fire mode due to smoke detector alarm all the AHUs shut down as per the control strategy for that building. When the fire trip is cleared back at the main Fire Panel (usually after a fasle alarm) some of...

Hi I have a tablet press machine in the middle of a production room making tablets. Next to the machine (3 ft away) I have a desk with a weight scales on it for measuring etc...The desk is on 4 legs and bracketed to the back wall. There is a slight vibraiton coming from the floor when the...

Hi I have an old hot water storage unit with a name plast on it and it is as follows Maximum working pressure 0.8 bar Design Pressure 1.5 bar Test Pressure 3.0bar What is the difference between maximum working pressure and design pressure. I want to increase the current working pressure to...

Hi, Im looking at designing a new Dust Colleciton System, with an extract fan, turrit dust collecor unit and circular ductwork to 4 machine outlets points, approx 4" per outlet. I want to make it as efficient as possible. Not all machines will be operational at once. I would like to put the fan...

Hi, I am trying to design the local extract ventilation system in a lab. Over the lab benches the user want ventilaiton arms with a hood to stretch down over the bench to where chemical etc are been mixed & tested. What velociaty should I be looking for at the extract point? is there any code or...

Hi I am providing chilled waetr to a 100L process vessel jacket where by purified water is manually poured into the vessel at 70 deg C. A coil surrounding the vessel within the jacket is linked to the chilled water system and is requireed to reduce the purified water in the vessel from 70 deg C...

Hi I am currently commissioning a PLC controlling the staging on and off of 3 nr. Steam boilers based on the modulation rate of the boilers. All boilers are different sizes. Staging them on is no problem. When the running boilers are at more than 90% modulation for 3 minutes another boiler is...

Hi I am currently commissioning a PLC controlling the staging on and off of 3 nr. Steam boilers based on the modulation rate of the boilers. All boilers are different sizes. Staging them on is no problem. When the running boilers are at more than 90% modulation for 3 minutes another boiler is...

I have just come across a control valve on a duct re-heat coil on the flow side of the coil. I usually put them onto the return side (leaving side). Is this a major problem.??? Will i get away with it??.... Interestingly we have had 2 actuator failures on this very valve, I wonder is it...

I have 2 chillers working nicely on duty/stand by set up. Each chiller is rated for 2400kw and approx 100L/s each and CHW F&R temp of 6/12 Deg C. It is a primary /secondary set up so the flow thro the chillers is constant and the variable speed secondary pumps vary the flow to the building. Only...

Hi I am installing a compressed air system that is made up of 4 air compressors approx 1400l/s in total. What size buffer vessel should I install down stream of the compressor on the main line. Is there any rule of thumb.?