What are the units and valves of HVAC in a five star hotel?

The question of whether it is good or not, and who is better, is a matter of opinion. Generally, the organization's qualifications, industry experience, external resources, and successful cases should be comprehensively evaluated and considered. It needs to be measured from the aspects that you are currently concerned about, and it cannot be said in one sentence or two.

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Refrigeration units, cooling towers, cooling, chilled water pumps, expansion valves, various throttle valves, solenoid valves.

The problem is too big.

But in general terms.

Unit: air source and water source.

Air source: air-cooled screw, air-cooled module, and then subdivided into air-cooled modules or screws.

The water source heat pump is also not bad, there are water source screws, water source modules, subdivisions, single cooling, single heating, cold and warm, hot ** and other types.

Valves: general gate valves, disc valves, globe valves, check valves, and ball valves are common.

There are many types of hosts, including water sources, ground sources, and air sources. At the end, if the requirements are not high, use a ceiling air conditioner and air duct system. If the air cleanliness requirements are very high, then use the fresh air unit.

Fresh air units, refrigeration units, valves are too many...

Generally, there are two types of units: air source and water source, and individual units may use ground sources.

Air source: including air-cooled screw, air-cooled module, and then subdivided into air-cooled modules or screws of cold and warm type, single hot type, and hot type; Water source heat pump: there are water source screws, water source modules, subdivisions and single cooling, single heating, cold and warm, hot ** and other types.

Valves: general gate valves, disc valves, globe valves, check valves, and ball valves are common.

Warm usually with valves have:

(1) Shutdown valve

This type of valve is used for opening and closing. It is permanently installed in the inlet and outlet of cold and heat sources, the inlet and outlet of equipment, and the branch line of pipelines (including risers), and can also be used as a water drain valve and air release valve.

Common shut-off valves are:

Gate valves, globe valves, ball valves, and butterfly valvesWait.

Gate valves can be divided into open rod and dark rod, single ram and double ram, wedge ram and parallel ram, etc. The closing tightness of the gate valve is not good, and the large-diameter gate valve is difficult to open; The size of the valve body is small along the direction of water flow, the flow resistance is small, and the nominal diameter span of the gate valve is large.

According to the flow direction of the medium, the globe valve is divided into three types: straight-through type, right-angle type and direct flow type, and there are open rods and dark rods. The closing tightness of the globe valve is better than that of the gate valve, the valve body is long, the flow resistance is large, and the maximum nominal diameter is DN200.

The spool of a ball valve is an open-bore ball. The plate-operated valve stem makes the ball open when it is facing the pipeline axis, and it is fully closed when it turns 90°. The ball valve has a certain adjustment performance and closes tightly.

The spool of the butterfly valve is a round disc that rotates along the vertical shaft of the vertical pipe axis. When the plane of the valve plate is consistent with the axis of the pipe, it is fully open; When the ram plane is perpendicular to the axis of the pipe, it is fully closed. The butterfly valve body length is small, the flow resistance is small, and it is higher than the gate valve and the globe valve.

(2) Check valve

This type of valve is used to prevent the backflow of the medium, and uses the fluid's own kinetic energy to open itself and close automatically when flowing in the opposite direction. Standing at the outlet of the pump, the outlet of the trap, and other places where the reverse flow of fluid is not allowed. There are three types of check valves: rotary opening type, lifting type and clamp type.

In the case of swing check valves, the fluid can only flow from left to right and automatically closes when it flows in the opposite direction. In the case of lift check valves, the spool lifts up to create a path as the fluid flows from left to right, and the spool closes when it is pressed onto the seat when the flow is reversed. For the clamp-on check valve, when the fluid flows from left to right, the valve core is opened to form a path, and the valve core is pressed to the valve seat and closed when the reverse flow, and the clamp-on check valve can be installed in multiple positions, small in size, light in weight and compact in structure.

(3) Regulating valves

This type of valve is for:Adjust the flow rate and pressureThe pressure difference between the front and rear of the valve is certain, and when the opening of the ordinary valve changes in a large range, its flow rate changes little, and when it reaches a certain opening, the flow rate changes sharply, that is, the adjustment performance is poor. The control valve can change the spool stroke to change the resistance of the valve according to the direction and size of the signal, so as to achieve the purpose of regulating the flow valve. Control valves are divided into manual control valves and automatic control valves, and there are many types of manual or automatic control valves, and their adjustment performance is also different.

Automatic control valves include self-operated flow control valves and self-operated differential pressure control valves.

Selection principles for common HVAC valves:

Globe valves, check valves, butterfly valves, gate valves, etc.

Commonly used valves have inspection ports that can be opened and closed. It is generally common to have a checkpoint.

Water distribution pipes and air ducts, water pipes, gate valves, globe valves, butterfly valves, electric two-way valves, balance valves, ball valves, check valves, etc. The air duct is a split multi-leaf control valve, an electric split multi-leaf control valve, a fire damper 70 and 280, a check valve and so on. Indeed, you can take a look at the relevant specifications, which will require the use of valves and so on.

There will be valves at the outlet of the pump, the place where the pipeline enters the house, there are many types, globe valves, check valves, butterfly valves are more commonly used, go to the next specification manual to see what.

Copper ball valves, automatic exhaust valves, butterfly valves, electric two-way valves.

Globe valves, gate valves, butterfly valves, check valves, exhaust valves, electric two-way valves, proportional integral valves.

American Crosen, Johnson (USA), Honeywell (Honeywell, USA), Danfoss (Danfoss, Denmark), Kitz Kitazawa (Japan) and other brands.

Johnson, Siemens, Honeywell, Enfinilan, Belimo, Danfoss

AHU air conditioner box, FP pipe, T fan coil unit, FD valve. The main functions include: heating, ventilation and air conditioning.

In addition, there are LG water supply, LH return water, LN condensate water, QG cooling water supply, QH cooling return water, inlet and outlet pipe valves, automatic control valves (temperature control), bypass valves, fresh fan doors, and return air doors.

The inlet and outlet valves control the circulating water of the coil at the fan coil unit, which is generally open and closed when the fan coil unit is to be repaired. The automatic control valve has a temperature-controlled electric valve that adjusts the water flow according to the temperature.

Bypass valves generally do not need to be opened when the automatic valve fails. The door of the new fan is in the new fan, and the new fan starts to open automatically. The return air door is manually opened and closed at the air inlet of the fan as needed.

LG water supply, LH return water, LN condensate water, QG cooling water supply, QH cooling return water, AHU air conditioning box, FP fan coil unit, valve types are more, such as FD, T and so on.

If you look at the first design description, there's usually a legend, a schematic diagram of the device, and a code name.

Send me an email and I'll send you a legend in CAD format! ~

It should be relatively formal!

There are the following types of commonly used valves:

1. Ball valve globe valve: used to open and close the flow of pipelines, and also used to adjust the flow rate.

2. Filter valve: built-in filter screen, which is used to prevent dirt from entering the equipment.

3. Safety valve: used to prevent danger caused by unexpected circumstances.

4. Three-way valve: adjust the direction of fluid flow.

5. Exhaust valve (manual and automatic): discharge excess or stagnant gas.

6. Automatic pressure reducing valve: When the system pressure reaches a predetermined value, the pressure will be automatically opened.

7. Check valve: the fluid can only pass through in one direction to prevent backflow.

And so on, there are many other categories, and you can usually tell the approximate purpose by the name.

1. Valves commonly used for HVAC of air conditioners are:

Gate valves, balance valves, globe valves, automatic exhaust valves, check valves, butterfly valves, temperature control valves, regulating valves, electric two-way valves.

2. Its role can be understood literally:

Gate valves, globe valves, and butterfly valves are all ordinary control pipelines with water on-off, but the water blocking methods are different;

Automatic exhaust valve: In fact, this can only be regarded as ancillary, which is used for exhaust at the high point at the end of the pipeline to prevent gas gambling and poor flow;

Check valves, also known as single-flow, can only flow in single phase to prevent blocking;

Temperature Control Valve: Literal Definition;

Control valve: adjust the water volume to achieve the function of regulating the temperature; Such as three-way control valves, as well as fan coil inlet and outlet water control valves;

Electric two-way valve: The air conditioning water system is used on the fan coil unit or the new fan water supply pipe, and the thermostat is used to control it to achieve open, close or partial opening to adjust the flow rate and control the temperature.

Balance valve: commonly used by HVAC, the purpose is to achieve balance on both sides, ** much more expensive than ordinary valves. Used at the competent branch.