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Whether to insulate and clad the exterior of evaporator vessels is determined on a case-by-case basis, depending primarily on product application and installation location. For dairy product applications, which (in most countries) are always indoors to maintain a sanitary operating environment, evaporator vessels are not insulated to avoid having a confined space (the insulation space) where microbiological growth could develop. The customer has full access to all vessel exterior surfaces for a sanitizing cleaning at any time should they choose. The evaporators for these applications are designed to account for a modest loss of thermal energy into the process room, which is generally only on the order of ~2 to 3% of the evaporator’s energy consumption as the evaporator process room is typically warm year-round. Evaporators for product applications that can be located outdoors (such as juices, non-dairy foods or chemicals) or in process buildings that can be cold in winter conditions are nearly always insulated and clad to minimize radiant thermal losses. Variable weather conditions such as wind and precipitation will disrupt steady-state evaporator operating conditions. Insulation and cladding in these applications reduces the influence of those variable operating conditions.

@@calorisengineering I've worked with 4 dairy evaporators, milk, whey, whey permeate and D90. None were insulated. What's your experience?

@@barryweblin3943 our engineer would like to chat with you further, but he's not on TH-cam. Can you please send us an email to info@caloris.com with your contact information and I'll get him in touch with you?

You are correct that one (1) turbo compressor will achieve a comparable compression of heating vapors (~ 25°F temperature rise) as compared to two (2) turbofans operating in-series. The reasons we find value in using the two (2) turbofans in-series versus just one (1) turbo compressor are: a) The initial capital cost and delivery timing of the two (2) turbofans are comparable to that of just one (1) turbo compressor. b) Our customers report significantly lower routine annual maintenance costs, and downtime for unscheduled maintenance, for turbofans as compared to a turbo compressor. c) The motors of the two (2) turbofans combined consume approximately the same electrical power (KW/hr) as the motor of one (1) turbo compressor (since they are achieving the same total vapor compression duty). d) The turbo compressor often requires a gear set to achieve required impeller speed (typically ~ 2x increase to the motor shaft speed) for its vapor compression duty, while turbofan impellers rotate at the same speed as the motor shaft (often in 4,500 to 6,000 RPM range). The gear set increases compressor maintenance complexity and costs as compared to turbofans. e) Turbo compressors achieve their high compression ratio due to tight clearances between the impeller and the inside surfaces of the impeller housing. This makes turbo compressors prone to “surging” issues if suction vapor flow decreases below compressor design rate, causing cavitation on the suction side of the compressor impeller. Customers have found “compressor surging” can actually cause building structures to shake (in-addition to the associated loud sound generated), and if allowed to continue too long can result in a catastrophic failure of the compressor’s impeller. We know of several cases where a compressor impeller failure dangerously sent metal shrapnel thru the compressor hosing into the surrounding production area. This surging issue can be addressed by recycling some discharge vapor flow back to the suction inlet of the compressor, but at the expense of reduced electrical power efficiency. Turbofans do not experience this surging phenomenon. The larger clearance between the impeller and the housing allows vapor to “slip” from the impeller discharge side back to the impeller suction side, preventing suction side cavitation. Turbofan impellers also rotate at ~ ½ the speed of a compressor impeller, and have not been know (as far as I am aware) to mechanically fail sending shrapnel thru the housing. In the end, the customers where we have replaced one (1) turbo compressor with two (2) turbofans in-series have told us they would never go back to operating a turbo compressor.

Hi. I have a issue of powder formation. Can you help?

I've been a dryer operator for a year now. I have an issue with cyclone jam, been trying to figure out the problem. Can you help

It merely depends upon capacity of plant ...... For eg - if feed of milk is 16500 ltre per hr then the pressure required will be around 6.5 bar minimum in TVR

In India MVR are very common to deal with industrial effluent high in total dissolved solids, and Roots blowers are very common.

What should be least minimum compression ratio for mvr to run evaporator plant?