At the beginning of the design, the control valve of pneumatic components can not find a matching, so it will create the imbalance of the whole system, which will cause unnecessary loss of energy consumption, so it is possible to be perfect at the beginning of the system design.
If the system cannot reach full load due to unbalanced design conditions, the total investment of the entire unit will not be returned. When large loads are required, the pneumatic component control valve is fully open and cannot handle this condition. It is very difficult to determine the size of the two-way control valve, the calculated valve is generally not available in the market, so the size is usually larger. In this way, circulatory system balance becomes very critical. Generally speaking, the input of this part is less than 1% of the total investment of hvac. Every morning, after overnight downtime, full power is needed to restore comfort as quickly as possible. A well-balanced system can be done quickly. If the startup time can be saved by 30 minutes, the energy consumption can be saved by 6% per day, compared with 8 hours of working time. This is more than all the allocated pumping costs.
In variable flow distribution, pumping energy consumption generally accounts for less than 5% of the seasonal consumption of refrigeration units. And the charge that reduces indoor temperature more 1 degree need is 10 to 16%. Therefore, getting the right comfort level is a better way to save energy. Therefore, all measures designed to reduce pumping energy consumption must be taken so that they do not adversely affect the operation of the control loop of the terminal device. By maximizing the design water temperature difference. T and using better positioning Δ p sensor of variable speed pump, can reduce the cost of pumping. Under medium loads, stable adjustable PI control requires less flow than switching control, thus reducing pumping costs.
But more important is the size of the compensation pump. The balance valve provided by the compensation method can display such oversized condition. All overpressure can be found on the balance valve near the pump. After the pump is modified, the pneumatic element balancing valve can be reopened. Cyclic balancing requires the right tools, newer procedures, and effective measuring devices. The pneumatic component manual balancing valve is obviously a more reliable, simpler product to obtain the correct flow under design conditions and is always capable of measuring the flow for diagnosis. It can also be connected to the differential pressure controller if necessary.
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