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MAINTENANCE


from the Institute of Refrigeration (IOR) which told me all about SEI (https://register.gotowebinar.com/ register/4303557086347370764). The analyser does all of the SEI stuff at the same time so that you can see the improvement in the System Efficiency Index as you make the adjustments to the chiller, before and after.


Bill: I don’t like to ask, but what’s a webinar? Ben: Oh, Boss! Bill: Okay, okay! If we buy one of these portable gizmo analysers, can we use it on other gear?


Ben: Of course – water chillers, heat pumps, single circuit fridge systems, supermarket packs, CO2


systems, ammonia systems, centrifu-


the running cost, given the chillers are consuming so much of the building’s total energy. Leave it to us to think it over and we’ll come back with a solution and proposals by next week if that’s all right with you?


Mary: Thank you Bill. I look forward to a positive outcome. See you next week, then. ---


Bill: Well, that was a tough meeting and she knows her stuff. But how do we figure out the cooling capacity? We’d need the water flow rate for that and there are no flow meters.


Ben: I think there is a way to give her what she needs as well as far more than she’s actually asking us for. Bill: Really? How? Ben: System Efficiency Index (SEI). It’s the new method for measuring the performance and efficiency of any type of RACHP system. I’ve read about a portable performance analyser that you can quickly connect to any type of fridge circuit to be able to see and record every detail of the performance. It shows power input, power factor, volts, amps, cooling capacity, heat of rejection, compressor efficiency and everything. And it can calculate the air flow and water flow rates for you.


Bill: What? But that just isn’t possible. Ben: It is! In fact, as it’s based on pure energy laws and thermodynamics, the customer just can’t argue with it. It’ll even handle glide refrigerants, economisers and oil coolers, just like the ones on the chillers we looked at today.


Bill: You’ve been reading too many books at college. All that pressure-enthalpy stuff has


www.acr-news.com gone to your head.


Ben: Actually, a guy from Business Edge demonstrated it at our college and that’s exactly what the analyser uses to figure out everything that’s going on. It even uses the compressor power input to calculate the refrigerant mass flow around the fridge circuit.


Bill: Is it easy to use? I’m just not into all that computer stuff.


Ben: Easy as pie. You can connect it to a twin circuit water chiller within about 30 minutes and then you’ll be seeing everything as she runs. You can set it to 1, 5, 10, 30 and 60 second reading intervals. So, if you want to adjust the main TEV superheat and the economiser TEV superheat, you can watch the effect of the changes right before your very eyes.


Bill: I don’t believe it. Ben: What’s more, if the superheat is too high and you open up the TEV, you might then see the sub-cooling drop too low, meaning she’s short of refrigerant and undercharged. You can then fix that at the same time, till you get the right sub-cooling.


Bill: So you mean that we can measure the chillers when we arrive, record the info, make the adjustments to improve the efficiency, reduce the power consumption, save that data and then show the customer the before and after situation?


Ben: Yep! Mary can then show her boss what a great job she’s done, and she’ll want to stay with us into the future.


Bill: Kid, that’s just great. But you’re forgetting one thing! SEI. How do we figure that out? Ben: I just checked in to a great webinar


June 2020 21


Bill: All right! You’ve made your point. Ben: You can also get a permanent performance analyser to stick on Mary’s two water chillers to continuously record and transmit all the data to a webserver. Then we can look at the machines at any time from a PC, phone or iPad, without having to trudge to site. We can even set it up to send us text or email alarms if things start to go badly wrong, so’s we can dash down there and fix it before a compressor fails.


And it’s able to give advance warning of refrigerant loss with indirect leak checking. Bill: Interesting. Does it make the tea as well?


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