Circulating water pump failure cause analysis of air ( 2)

air circulation pump capacity, unit, the number of pumps, as well as, the selection of optimal working point to technical and economic analysis to illustrate how to select the water pump, in order to ensure the good operation of the air conditioning system, reducing power consumption.
one, in the cause of the excess air circulating water in air conditioning pump capacity:
too much circulation pump capacity is the common problem of our country, its ability, often leading to - In times of real need, project investment and serious waste management costs. The main reason is:
design cooling load is too big:
design cooling load is to choose the equipment, so the load of the cooling air conditioning system construction of the main basis of correct calculation is very important. At present, textbooks and air conditioning load calculation method of design guidelines to calculate the load of the walls, doors and Windows or load envelope, the results for a particular purpose. However, according to determine the cooling load of the building air conditioning system equipment capacity. The position of buildings, space, function and different heat source, and other factors, often in each room of the biggest refrigeration load leads to a different time. Therefore, the biggest building cooling load should be the maximum value when the load of each room overlay. According to the survey, in the building cooling load calculation of some Chinese designer is just one of the biggest every room cooling load overlap, but as a result of the load is far greater than actual demand is bigger. Therefore, we must pay enough attention to this, make a design more reasonable, in order to determine the correct load.
system circulation resistance:
the calculation of vascular resistance system, due to the lack of experience, make some design calculation parameter value is too conservative, in vascular resistance calculation value is too large, or even worse, construction drawing design phase estimation method is used to determine vascular resistance in value than the actual loop resistance produced by one or more times. Air conditioning systems run with water, pump into, exports have been the same hydrostatic pressure. Therefore, the choice of pump head can only be overcome resistance pipe system. Some designers, however, also including the confusion of hydrostatic pressure in vascular resistance, of course it will increase the ability of a lot of circulating pump.
system static pressure problem:
air conditioning systems run with water, pump, exports have been the same hydrostatic pressure. Therefore, the choice of pump head can only be overcome resistance pipe system. Some designers, however, also including the confusion of hydrostatic pressure in vascular resistance, of course it will increase the ability of a lot of circulating pump. Water balance, system:
as the design of the hydraulic system is not serious balance calculation, then the project is complete, not comprehensive debugging often cause disorder of hydraulic system, system will appear positive phenomenon. Some technicians mistakenly think that this phenomenon is caused by circulating water pump capacity is too small, only by increasing the pump method as a result, in order to solve it, naturally, the pump capacity increased. Flange pneumatic ball valve
second, along the curve moves to the right of the cause of the pump working point of the design:
offset, in the working point of the pump power, the head of the circulating pump to produce low, this is the normal operation of the system is very bad, especially in the most unfavorable loop system, will lead to further reduce the process of circulation, affect the normal use function. Caused the rights of the working point there are two main reasons:
, the first is safety coefficient used in the hydraulic calculation is too large, and not the actual pressure drop calculation method for
, the design of the hydraulic system to follow not careful balance calculation, and then not strict construction system debugging. Therefore, in order to make the system run according to the design conditions, in addition to conscientiously implement the relevant calculation, but also on the choice of the working point of the pump when the pump working point on the left side of the choice of the best places, to prevent the pump operating beyond a certain range of operating conditions of the real problem is not economic, affect the normal operation of the system.