Okay, makes sense, and yes it would essentially be just the evaporator within the unit as the condenser is selected separately. The only thing I am hoping to grasp a little better is the relationship between the suction temperature and the delta_T (leaving air temperature). I have to make sure...
Like I had mentioned, I am using a selection software. It is a matter of putting in certain values in the required fields. I noted that a lower suction temp. meant a higher total capacity and lower leaving air temp. I am not too sure about the practical effects of this mechanical-wise, which is...
Hello All
So I had a scenario where I was required to select a roof top packaged air conditioning unit, 100% recirculation with the entering air at 86F (mining operation). Needed a capacity of 177 MBH and leaving air of 55F. I could get close, but not quite. The suction temperature was at 50F...
So if I understood correctly, a turndown of 20% full rated capacity (0.2) is 5:1, and 30% (0.3) is around 3.35:1? Meaning, the lower the ratio, the smaller the range between max and min? Is it also possible to get 20:1 or better for indirect gas fired? As bimr did state, it can vary according to...
Thanks for the responses, big thank you particularly to bimr for his. More or less confirmed what I had thought and clarified it for me. I asked initially because I was dealing with an equipment catalog that used percentages for the turndown of a natural gas heater but a client of mine had used...
Hello All
Have a quick question concerning turndown ratios. It is in regards to a natural gas fired heat exchanger.
I seem to understand the concept of a turndown ratio, as it deals with full capacity versus minimum operating capacity of the gas flow, i.e. 1,000,000 m3 full versus 100,000...
