Heating ventilating and air conditioning hydraulic dynamic regulation method and device based on energy distribution equilibrium

Abstract

The invention discloses a hydraulic adjusting method of heating air conditioner based on balance energy distribution, and a relative device. The inventive method comprises data collection, data treatment, logic judgment, control variable output, and adjustment. The invention collects three parameters as the temperatures of fed water and reflux water and the pressure difference to calculate out the temperature difference, the average temperature difference and the temperature bias of reflux water, then processes the logic judgment to output the control variable. The inventive device comprises sensors, a water distributor, a water collector, a parameter collecting box, a computer, a hydraulic balance controller, a frequency changer, a circular water pump, and some electric adjusting valves, wherein, the sensors are connected with the parameter collecting box (4); the frequency changer (13) and the electric adjusting valves I(10) are connected to the hydraulic balance controller (6); the parameter collecting box (4) and the hydraulic balance controller (6) are connected with the computer (5).

Description

Technical field: [0001] The invention relates to a method for adjusting the hydraulic balance of the HVAC water system, in particular to a method for dynamically adjusting the hydraulic balance of the HVAC water system; the invention also relates to a device for realizing the method. Background technique: [0002] In the building HVAC system, the refrigerant or heat medium is transported and distributed to the end users by the closed pipeline system. The HVAC water system is often divided into several areas according to the characteristics of the air-conditioning load, and each area is composed of a water system loop. Hydraulic imbalance is a common phenomenon in the process of use. Although the water system loops in each area can use the same program system, it will still cause the problem of unbalanced resistance between the loops under different loads. Due to hydraulic imbalance, the flow distribution of the system will be unreasonable, resulting in excess or insufficien...

AI Technical Summary

Problems solved by technology

But even if this is done, the static hydraulic balance still cannot guarantee the dynamic energy demand of each loop of the air conditioner

This is because: the complexity and diversity of the internal functions of modern buildings and the time-varying nature of the load, the demand for cold and heat in each loop of the air-conditioning water system is different, and it is dynamic. The load appears at different times, so even if the hydraulic static balance of each loop is achieved—the water flow meets the design ratio requirements, the air conditioning effect of each loop is still unbalanced

Moreover, due to changes in the opening or closing of some loop end loads, the water flow of the system will inevitably increase or decrease, and the hydraulic balance of the system will also change accordingly, resulting in new hydraulic imbalances.

As a result, for a constant flow water system in which manual adjustment elements such as throttling orifice plates and manual control valves are installed in each loop, the resistance and flow distribution of the system will change, resulting in an increase in the flow of other loops. or decrease; for a constant flow water system with dynamic flow balancing valves installed in each loop, when the pressure difference between the front and back of the valve is still in its normal working range, the flow of each loop can still be kept constant, but it will cause The flow of other terminal air-conditioning equipment in the same loop changes, resulting in hydraulic imbalance in their respective loops; when the flow changes greatly and the pressure difference of the water system exceeds the normal operating range of the valve, the dynamic balance function of the valve will fail, which will lead to the hydraulic imbalance of the entire system. out of balance

[0004] It can be seen that the hydraulic imbalance of the HVAC system is very common, randomly changing, and dynamic. The application of the hydraulic static balance adjustment method cannot overcome the above defects. Only the dynamic hydraulic adjustment method can truly and effectively solve the HVAC system. hydraulic balance problem

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