In the circulating water system, there are same process and different process of c, generally with the process design
Superior to different process is designed, using compared with routine design for hydraulic balance of the system. mining
Use same process design and different process design should be based on specific circumstances, not all
To process design theory, most small contains different process design. Adopt jing to process design and different process
. The system pipeline than the determination of friction is completely different. Relatively
Process design of pipe resistance than library is more complicated, for sure, if processes is not good will make the end
Lack of water supply equipment.
For f: - a circulation system, under what circumstances is suitable for use to process design,
In what circumstance P for using different designs? We believe that through years of practice, in
Fire design, both in the riser, mine water pipe has with cheng and strange. Some of the design
Think: riser not ask necessary for process design, used to process design can make the riser
To increase 2 to 3 root, hinge to pipe well area requirement; This statement is a way
, adopting this design opposite tube diameter is larger, especially in high-rise building
To build on. For example, a building height is 50 m, if the design of the pipeline water resistance
Is 100 pa, so, at the top of the air conditioning water system and air conditioning water system on the ground floor
Than, because of the riser pressure differential formed by the water resistance of 10 kpa: so, will lead to the top floor
Ning regulating system water supply is insufficient, therefore as designers, usually at the levels of each layer of the pipe
Add water adjustment valve, this kind of method to solve the top water shortage is very practical,
At the same time, to reduce the loss of water resistance of the stand pipe should be suitable books increase the river's upper part of the pipe diameter. but
In the actual use also exist certain problems in the process, it is a system is likely to Ann
A few sets of circulating water pump, the system load is small, can't start all circulating pump,
The system circulating water, causing the top water supply shortage. Due to the adjustment valve in tone
The whole process is influenced by many factors, is more difficult for multistory buildings, very
Hard to make each layer to get the corresponding flow:
As to the installation position of water flow adjustment okada, a lot of people think, as the water flow
Adjusting valve too fall is placed in the feed line, or the return water pipe L can have the same
Role. The factory is a stable system, there is no problem. But we are over the years
Practices prove that: install the adjustment valve installed in the loop of divination is superior to the feed pipe road:
Why is that? This is mainly due to the adjustment valve installed in the concave conduit road and installed in the water
Within the system, compared to the work pressure, reduce the possibility of air into the system
Sex. For the air into the system, due to the increase in the pressure in the runtime system,
Within a system of air volume, easy to row into the concave gas pipe, the giant
Through the automatic exhaust system in the trachea way.
At the end of a drawing, once had a such drawings, cabinet 3 · 3 is the
The central air conditioning design part.
Not to consider the rationality of equipment layout at the end here. Assume that design selected end
Equipment, fan coil units of water resistance are 10 kpa, water circulation system for water resistance
100 the PJM. It is not hard to see from the drawings, fan coil units closest to the main line, in and out
Water pipe length of about 10 m, and the farthest from the "bian to return water pipe fan coil units, in and out
Water pipe length is about 120 m (there are no considering the yield of the pipeline length). It is
Is said that the recent fan coil units corresponding to the return pipe of about 10 m M100Pa/water resistance
M = 1000 kPa pa = l, and the farthest from the abundant concave water pipe the water fan coil resistance
About 120 m M100Pa/m = 12 delete Pa = 12 kpa. That is to say: circulating water from
Charting the feed water pipe into the recent fan coil units, and then total resistance is concave to the main water pipe
11 kya, and the total resistance for the farthest fan coil 22 kya. There is no consideration of valve
The door, the water resistance of soft connection. See uJ, farthest fan coil resistance is the latest of water
More than twice of fan coil units. If the system of water supply is just meet recently, fan coil units
To water, then the farthest fan coil units to the water? Can meet the water needs
Please? Assumptions can satisfy the requirement of the fan coil units as far as water supply, plus in recent fan unit
Water pressure difference at the ends of the tube is 22 kpa - lkPa = 21 lpa, towel force 1 R in recent fan coil
Hydraulic double, so can make the fan coil units increase water supply recently,
Although not increase "times. At least can also be increased by 50% to wu, this will increase the circulating water
Quantity, make the circulating pump power is increased, virtually increased the operating cost of the system
To use.
Foot is not as far as the end device from soil to more than 120 m in backwater pipes? 2 = 60 m is
Cannot adopt different designs? Is 44. If the span is small elongated structures, and
And tight between words, is not possible. This can be achieved by increasing diameter in each
A terminal device equipped with hydraulic balancer or install regulator valve, increase the system cycle
To solve the water, etc. For the system is completely different to the span of a building
In 35 m, with routine design does not increase the dosage of the pipeline system. I don't know the designer
From which perspective, design into two different circuits, cheng: why can't I designed
With routine loop? At first editor thought have fire doors or obstacles such as shear culture cannot pass
, but is not the case.
Figure 3, 4 is a map of designer changed later. Basic no change after.
Increase the pipe usage, and installation costs, make the hydraulic balance of system
Perfect distort prices.
In actual construction, to make up for the possible error, design calculation is reduced
System after the operation of the difficulty of the terminal equipment hydraulic balance adjustment, increase the stability of the system
Sex, in the design and construction should be used as much as possible with the process design. However, in most of the same process
Contain different designs in the meter. What is suitable for using different process design, so far
Is not as difficult as a qualitative standard, also can't be in the future, so, can only be opened to see
Wide, intellectual room see wisdom. Here the different process design parameters is a nonsense.
For use with the process design of the system, and each terminal equipment for pipe flow
Basic equivalent dynamic resistance; With different design process, the terminal equipment of the pipeline resistance
Large difference, the farther away from the Lord to return water pipe equipment, at the end of the corresponding pipe water resistance
The greater the force. Then, whether all the systems should be designed with a process design? Also don't
Necessarily, if, terminal equipment farest distance in the horizontal circulation system to ask soil pipe
After a short, there is no need to use with routine design. For example, terminal equipment range to Lord
Concave water pipeline total length less than 20 m, or, though as far as the wooden end of the equipment from the Lord
To return the riser is far, but because the level of system main to return pipe can only be installed in the corridor
Corridor, and the space is limited, in this case also can use different process
Meter. But in the end of the construction process should be based on distance pipeline in different equipment
Open and flat place corresponding resistance device c if there is no suitable hydraulic balancer can also be used by adjusting
Wooden end device adjusting valve to solve.
For a water resistance calculation and reasonable central air conditioning system. In general, the following
The input power of the ring of water pump should be low 3 'e cold (hot) load is 2%
In the circulating water pipe diameter design, using the relatively larger than the friction, uJ to minimize
Pipe diameter, reduce the project cost system. But because the system resistance increases, water cycle
Pump head must increase accordingly, which will cause the increase of operation cost, and even make the system
Normal operation of the system.
'm 5 cafe' mall, hot and cold water source USES the heat to 360 kw
Heat pump units, the volume of the water cycle is 55 m/h. ShiDing unit to reduce the cost of shi] :
In the process of construction of main use delete. Tube, circulating pump USES the KQ concave o / 220 -
15/2 type circulating pump. KQl50/220 "15/2 type circulating pump input power of 15 lw.
According to the heating of the unit capacity is 360 kw, the input power of the circulating water pump should be low f 360 M
2% = 7.2 kw: considering the circulating water pump motor without 7.2 2 selected Lw this' specifications
Circulating water pump motor power should be 7.5 kw, clearly the actual selection of circulating water pump power
Machine power beyond the normal mouth. Every year, water source heat pump system running time
Calculation for 250 days, every day running 15 h, then a year increases the power consumption of circulating pumps
250 m15h M (15-7.5 kW) x 75% = 21093 kW "h, and the system because of the drop
Low circulation system of the savings by moving to pipe diameter steel quantity to increase but at most 3 tl
The cost how many? So, by increasing the water resistance, reducing pipe diameter to reduce
Project cost is wrong, is a kind of harm the user's behavior. Province, nor
To increase circulation pipeline diameter at will.
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