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Gents, We are in the process of designing closed chiller that will be connected to teh water supply system. To prevent back flow I have been going through some document on the internet, but I noticed that there is a requirement for a double check valve. I also have an existing system here, but...

Gents, I have been asked to change from GRE piping to DHPE piping for our underground chilled water supply system. The Existing GRE has worked very well and I do not want to change. But others think different about this new part of underground chilled water piping. What is your experience...

Gents, I have a design where three way vales have been added in a variable flow system, inorder to maintain a minimum flow. This is againt what I was told; constant flow is three way valves and variable flow is two way valves for capacity control. Who can tell me his experience with this. Will...

Gents, I have a request in from my engineering company to use ETLITE piping sizing for a chilled water system. Unfortunately I have no experience with this software, so my question is; What is your opinion about this soft ware.

Hello, We are having a problem here with our condenser coils on our chiller system. The standard copper / al coil with blygold treatment is corroding and need to be replaced with coil with a better protection. We have suggested to replace it with a coil with a Carrier E-coating, but our...

Dear Collegues. I have a document for review and it contains a quick fill connection, but what I see is a main supply connection and not a quick fill connection. Now I have never seen a quick fill connection. Can you help me on a sample of a quick fill with a main supply connection ( it is...

Having to design the main pipe in the primary loop of a chilled water plant. I want to connect 5 chillers to the primary loop of a chiller system. 3 units will be connected immediately and 2 units will be future connection. The connection of the chiller is a 6 inch victaulic connection. In...

I am working on a project in a coastal and very humid area. We have appartments here that are being airconditioned with a fan coil unit connected to a chilled water system. When the occupant of the room puts the temperature too low (like 20 Deg C), we have a lot of condensation on teh ceiling...

I have to install a fresh air AHU with DIN flanges. As I want to use everything in DIN I noticed that the wall thinkness is very samll for the smallest size only 2.3 mm for a DIN 80 or 3 inch pipe. There are thicker wall sizes like 3.2, 5.6 and 8.0 mm. Having looked at the anse pipe equevalent...

I have a server room of 100 m2 (1076 ft2). The intention of IT is to install here servers with a total equipment load of 450 kW (1535464 Btu/hr). If I start to select Ac units for this room I can go for 4 units (3 duty/ 1 standby), but they take about 26,25 m2 of space , or if I take ( 2 duty/...

As the title already indicates, what is the allowable leakage for an air tight room?

I have two identical freezer/ cold store. The Freezer is on R404 and the cold store is R134a. My customer has now asked if he can change the cold store with R134a to a freezer with R404. As the information on the evaporator indicates that it can handle both refrigerants and the units are...

This is a part of a control system I do not understand how it works. But to explain a little how it should work and see attached drawing. It is the clowded part I like to understand. The power supply is indicated as N L1 L2 L3 and PE. Q0 is the main breaker that needs to open when we have...

I have been looking for a psychrometic chart programme, that will calculate the sensible and latent load required between two points in the psychrometric-chart. Up till now I can only find programmes that give me the condition at different point but they do not calculate the sensible and latent...

I have got a control design and notice that the single phase power supply went through a three phase circuit breaker twice. I have asked our electrical engineer here, but he told me there was a reason for it but he cannot remember what the reason is. Can anybody here tell me what the reason is...

My contractor wants suggestions what to put in the gap between the fire damper and the opening in the wall for a 2 hour fire rated wall. I only told him so far that it must ne something that will keep the 2 hours fire rating. But what the construction or material will be I have no idea, here is...

As protective measure against a salt laden area, I have specified the condenser coils to be e-coated. But I have never seen an e-coated coil before, the question is; how do I recognize that the coil had been e-coated?

My HVAC contractor is asking for sample drawings They like to see a sample of a balancing drawing with the indication of duct size, air flow, Air speed, pressure drop. Also a D& ID drawing they would like an example of. Can anybody upload a PDF sample of this type of drawing? Thanks

My design contractor says, he does not need to put a fire damper in a duct that goes through a fire rated walL when the size of the duct is 160mm in diameter or smaller? What is your opinion?

My equipment supplier sugests to put a blue fin coating on the Air Cooled Condensing Unit due to the fact that the units are installed close to the sea. Now I have got som experience with Blygold as protection, but I do not know anything about blue fin coating. I also have the feeling that this...