水力失调和水力平衡的讨论研究.doc

Hydraulic disorders and balanced discussion on hydraulicAbstract HVAC works in the building, the regulation of water balance is an important issue. In this paper, static and dynamic balance hydraulic hydraulic balance the concept of combining two kinds of hydraulic and the characteristics of balance, Analysis of the traffic flow system and the system changed several typical way of hydraulic equipment balance the choice and implementation of water balanced manner.key words Hydraulic disorders; Steady ; Operation Condition ; The number of resistance1 Hydraulic disorders and the concept of water balanceIn hot water heating system and chilled water air-conditioning system in the thermal (cold) the users actual traffic flow and design requirements as the inconsistency between the users of water imbalance.Hydraulic disorders can be the extent of the actual traffic flow and design requirements to measure the ratio of X, X said an imbalance of water.X = QS/QJ（QS：The actual user traffic，QJ：The design requirements of the user traffic）Hydraulic balance refers to the network of users in all other users of changes in traffic flow to maintain unchanged the ability of their own, usually with hydraulicstability of the users coefficient r to that.=1/ XMAX = QJ/ QMAX （QJ：The design requirements of the user traffic，QMAX：The largest user traffic ）2 Hydraulic hydraulic balance disorders and the classification2.1 Static and passive hydraulic hydraulic balance disordersAs the design, construction, equipment and other material reasons for the resistance of the pipeline system and design requirements than the number of channels of resistance ratio of inconsistency, So that the actual system user traffic flow inconsistent with the design requirements, arising from the hydraulic system disorders, called the static water imbalance.Static hydraulic imbalance is the steady, fundamental, is inherent in the system itself, is Chinas HVAC water in the hydraulic system disorders an important factor.Through the pipeline system in additional static balance hydraulic equipment (hy -draulic balance valve) of the pipeline system to regulate the ratio of resistance to the pipeline design requirements of the same ratio of resistance , At this time when the system throughput to meet the design flow, the flow of terminal equipment are also to meet the design flow, static hydraulic system to achieve balance.2.2 Dynamic imbalance of hydraulic and dynamic water balanceWhen a user opened the valve of changes in water flow changes, other users of the flow also will be changed, from design flow, resulting in an imbalance of water, called hydraulic dynamic imbalance.Hydraulic dynamic imbalance is dynamic and changing , it is not inherent in the system itself, the system is in the process of the operation.Through the new pipeline system in the dynamic balance of hydraulic equipment (flow regulator or pressure regulator) , when other users valve opening event of a cha-nge, Dynamic hydraulic equipment through the balance of shielding, so that the flow is not followed its own changes, terminal equipment does not interfere with each other traffic, when the hydraulic system to achieve dynamic balance.3 The flow of the hydraulic system of balanceThe flow of hydraulic balance HVAC system design is common in the hydraulic system, in the process of running the entire traffic system remained unchanged. Com-monly used in the following two forms:3.1 Complete system for trafficComplete set flow system is in the system without any dynamic valve, the system after the completion of commissioning in the early opening of the valve not to make any changes, The entire system to always maintain a constant flow. Full flow system will apply mainly to terminal equipment do not have to adjust to flow through the system, If the end of a three-speed fan coil switch regulating wind speed and the use of variable air volume air handling units of air-conditioning systems and lower system requirements, Just climate heating water temperature compensation for adjustment to meet the basic needs of the heating system.Complete set flow hydraulic system exists only static imbalance , and there is no hydraulic dynamic imbalance , the only static in the relevant parts installed hydraulic equipment can be balanced.Usually in the engine room catchment system installed on the hydraulic balancevalve; water for air-conditioning system that can return to the building each floor level of water pipes installed on the hydraulic balance valve. Figure (1-5).For some systems, although not contain any dynamic valve, but not through other means to regulate non-flow, Therefore, in actual operation of users because of a cold or overheated rooms and change the valve opening to change the flow, so that this system can be set between traffic and variable flow between3.2 Single-tube series (with the bypass) heating systemOne-pipe heating system including the series of vertical double-standard onepipe system and vertical series single-tube systems . This system will remain basi- ically unchanged in charge of traffic, is scheduled traffic system. The former as an example to illustrate the hydraulic system to achieve a balanced manner.Such a system exists mainly static hydraulic imbalance in the level of branches on the two-or three because of the regulatory role of Wen Kongfa . There is a certain dynamic hydraulic imbalance . So just in the relevant parts of the hydraulic balance additional related equipment to enable the system to maintain water balance . Asfoll- ows:(1) in the engine room catchment system installed on the hydraulic balance valve;(2) in the legislature to set up water pipes on the hydraulic balance valve;(3) in the horizontal branches of the installation of traffic on the regulator to ensu re that the branch loop constant flow (in this branch can loop pipeline of internal cha-nges to maintain a constant flow, May also change in other loop to avoid traffic by jamming).4 Variable flow of water balanceDue to peoples quality system requirements and the continuous improvement of energy-saving awareness , change water flow in the HVAC system works occupy an increasingly important position. Variable flow system in the process of running allbra -nches of the loop traffic load along with the external environment changes and chang -s . As HVAC works in a year of operation for most of the time in a partial load oper operating conditions, most of the time variable flow system flows are lower than the system design flow. So such a system is real-time, sensitive, highly efficient, energy- efficient.Due to peoples quality system requirements and the continuous improvement of energy-saving awareness , change water flow in the HVAC system works occupy an increasingly important position. Variable flow system in the process of running allbra -nches of the loop traffic load along with the external environment changes and chang -s . As HVAC works in a year of operation for most of the time in a partial load oper operating conditions , most of the time variable flow system flows are lower than the system design flow. So such a system is real-time, sensitive, highly efficient, energy- efficient.Variable flow system in general there is still imbalance in water, there are also hy draulic dynamic imbalance , it is necessary to adopt correspon