Search results for query: *

Thanks for the correction, walz. I already have recovery wheels installed on site, but I was wondering how I can further harness the cold energy from the exhaust air with the current system? Other than increasing the exhaust air flow through the wheel, any other ways I can increase energy...

Hi everyone, Just wondering if anyone knows how to improve the efficiency of a heat recovery wheel? Other than good maintainance to ensure its performance, is there any other way to enhance it further? For eg, increase speed of rotation etc. I can't seem to find much info on how a heat wheel is...

Hi everyone, I've read about Kathabar systems online and am hoping to gather some general feedback, since I don't think it's very much used in Asia yet. Does anyone have any experience of retrofitting your current systems with it? Is it cost effective? Does it really work in terms of energy...

In a pharma facility, corridors are usually kept at a higher pressure as a way to protect personnel and cross-contamination of the products between rooms. zeronet: I'm also doing something similar. Do your production area and corridors share the same AHU? If each area has its own, then setting...

Okay... So, if I have an original Q of 76000CMH running at 70kW, and an estimated reduction in flow to 56000CMH, the new power of the fan would be 28kW? Is that really possible? What is a good safety factor I can use for this? I need it for cost savings calculation. Thanks!

Hi everyone, Wonder if you guys can provide a good method of calculating the estimated fan motor power after I reduce the rpm of the fan? The info available are the current fan power, current flow capacity and new flow capacity. I know there are the fan laws where Q1/Q2 = rpm1/rpm2 and...

Hey all, Any idea how I can calculate the 3.5 barg nitrogen gas flow rate from a pipe when there's a pipe rupture? Pipe size is 1 in. I've tried using the choke equation, but the value gotten was quite small. We did a rough trial (by just fully opening the valve) on site using a 1"...

Calculations are for cost benefits tabulation when we convert both supply and extract fan motors from fixed speed to VSD. In this case, we suspect that the fans may be oversized and are trying to find out what are the actual airflows supplied and extracted.

Yeah, that would be great. There aren't a lot of resources online that teach how to calculate it. Google on the topic and this forum will be the first on the list of search results. Thanks anyway!

Hi everyone, Is there any way that I can calculate the pressure build-up in a room by just knowing the inlet + exhaust flow rates and room volume? I understand leakages through door gaps should be taken into consideration and they can be calculated using Q = 0.827*A*P^(1/N) [This is in SI...