Method of reducing heat and electric energy consumption in circulation hot water supply system

FIELD: heating systems.

SUBSTANCE: method of reducing heat and electric energy consumption in circulation hot water supply system consists in the fact that water flow for hot water supply is measured, rotating speed of circulation pump is controlled in inverse dependence on ratio of measured water flow for hot water supply to original flow value, and controlled rotating speed is restricted with minimum value.

EFFECT: increasing economic efficiency of hot water supply systems made both as per open and closed scheme without decreasing water supply comfort.

5 cl, 3 dwg

 

The technical field

The invention relates to heat residential, administrative and industrial buildings and can be used in circulating hot water systems.

The level of technology

Circulating hot water systems are known and widely used (see, for example, Ito and others Increase the efficiency of hot water systems. Moscow, Stroyizdat, 1980, page 23, figure 13÷16). Hot water circulation prevents the stagnation and wystawianie at small separation (e.g., at night) and, thereby, provides comfortable water supply. However, it is widely used at the present time circulating hot water system economical enough.

Known technical solutions (systems and processes), aimed at improving the efficiency of the circulating hot water systems (patent RU 2005267, EN 2265776, EN 2273800, EN 2307289). The closest technical solution, which can be taken as a prototype, is "the Way of heat supply system" in patent RU 2307289, IPC F24D 17/00, publ. 27.09.2007, in which, as in the proposed method, we solve the problem of energy saving by maintaining optimum flow rate of the circulating water in the hot water.

In the prototype method mix the water, taken from under the nes and return piping for heating systems, with water supplied from the circulating pump. Water withdrawal from the supply and return piping heat regulating, controlling the respective valves. The selection of the water delivery pipe regulate heat to maintain a constant temperature of water supplied to the hot water, and water withdrawal from the return pipe to maintain a constant pressure at the inlet of the circulation pump. This replenishment of the circulating water return delivery water is blocked during periods of minimum demand and increases during periods of maximum demand. The decrease in the consumption of thermal energy according to the method prototype is achieved by reducing the reverse net flow of water during periods of minimum demand.

Any control of the circulating pump of known methods, including prototype method, do not provide for he constantly works with a nominal frequency of rotation.

The disadvantage of the prototype method is that at a constant (nominal) rotational speed of the circulating pump circulating water migrates to the consumer the maximum amount of heat. In addition, since the sampling of water from any (supply or return) pipe heat affects both the temperature and pressure of the water in the hot water circuit, process the reg is investing in the method prototype is in vibration mode, which reduces the comfort of the water.

These shortcomings do not allow the method prototype to ensure effective cost saving of heat and, especially, electric energy, while maintaining the comfort of the water.

In addition, the disadvantages of the prototype is the lack of universality in relation to the type of source of hot water supply (as a source of hot water circulating systems are used not only faucets, and water heaters). This limits the practical implementation of the prototype method in the existing hot water systems.

The invention

The objective of the invention is to propose a generic for circulating hot water systems technical solution that provides effective cost saving heat and electricity without compromising the comfort of the water.

The technical result of the invention is to improve the economic efficiency of hot water systems, performed both open and closed circuit (i.e. regardless of the type used in the system of the source of hot water) without compromising the comfort of the water.

The subject of the invention is a method of reducing the consumption of heat and electricity in a circulating hot water system, which consists in the fact that the measure p is the gathering of water on hot water, regulate the speed of the circulation pump in reverse based on measured water consumption for hot water supply to the base value of consumption and limit adjustable speed minimum value.

This allows you to get the above technical result.

The invention has a development and clarification relating to individual cases of its implementation, namely that:

- this inverse relationship can be

where ω is the rotational speed of the circulating pump, Q - measured water consumption for hot water supply, Qb- the base rate that can be chosen equal to (0,7÷1,4) from water consumption for hot water supply in the period of maximum water consumption, ωmax- the maximum value of the adjustable rotational speed, which can be set equal to (0,9÷1,0) from the nominal frequency of rotation of the circulation pump;

- the minimum value of ωminadjustable rotation frequency is chosen equal to (0,05÷0,3) from the nominal speed of the pump.

Brief description of figures

Figure 1 shows the block diagram of the hot water system, illustrating the example of the proposed method. Figure 2 shows examples of the dependence of the rotation frequency of circulatio the aqueous pump on the ratio Q/Q b. Figure 3 shows the graphs of thermal capacity.

The implementation of the invention with regard to its development

The block diagram in figure 1 contains the hot water source 1 (which may be performed, for example, in the form of water heater), the supply pipe 2 and the return pipe 3 connected to the input source 1. In the return pipe of hot water is installed circulating pump 4, and a feed line 2 is a sensor 5 for measuring the water flow rate Q. the Circulation pump 4 is supplied with an adjustable actuator 6 to the control unit 7. The actuator 6 may be performed, for example, on the basis of the DC motor, AC motor, switched-reluctance or other type of motor. Shown in figure 1 as an example, the actuator 6 of the pump 4 contains the engine 8 of the alternating current supplied from the inverter 9 frequency, which includes the block 7 and the power unit 10. To the information input 11 unit 7 is connected to the output of the sensor 5. Installation input 12 unit 7 is designed to introduce constants ωmax, ωminand Qb. The block 7 is arranged to control the rotational speed of the circulating pump 4 in inverse proportion to the ratio Q/Qband with the ability to limit the rotation frequency ω of the circulation pump minimum value of ωmin.

The way the OS is done as follows.

Tap water delivery pipe 2 together with the circulating water return pipe 3 enters the source 1. Hot water from source 1 enters the distribution line 13. Through towel 14 hot water arrives to the standpipes appliances (cranes) 15 and in the return pipe 3. The source 1 spends energy to heat water before the consumers, and the cooled circulating water that is returned by the pump 4 through line 3.

In the known circulating hot water systems, including the system operating according to the method prototype, the circulation pump 4 is not adjustable electric 6. When the pump motor is connected directly to AC power and rotates the pump 4 with a nominal rotational speed, which is selected for the project based on conditions prevent wystawianie in the absence of consumer demand. In the presence of water and especially in the periods of its maximum heat delivered by the stream of fast-circulating hot water is excessive, and its secretion in the pipeline 3 straight losses.

In the system, carrying out the proposed method, the motor 7 of the pump 4 is connected to the mains through a transformer 9, block 7 control which adjusts the frequency of rotation ω of the pump 4 ACC is accordance with the value of the measured water flow rate Q, at the input 11 of the block 7 from the sensor 5. In the implementation of the proposed method unit 7 adjusts the frequency ω in inverse proportion to the ratio Q/Qb.

The flow rate Q of water for hot water supply is determined by demand, which has periods of peak (morning and evening) and minimum (night). As the heat bears as water, examine consumption and circulating water, and the amount of heat given to the circulation flow, depends on the rotation speed ω of the circulation pump, an inverse relation ω(Q/Qb) saves heat without loss of comfort water at values of ω greater than some value ωminequal to, for example, (0,05÷0,3) from the nominal speed of the pump. When values of ω(Q/Qbbelow ωminunit 7 limits the speed at the bottom, keeping it equal to ωmin.

The need to limit the speed from the bottom to do with the fact that when ω<ωminwhen circulation is inadequate or missing, comfortable mode cannot be guaranteed (even at large separation) due to the high probability:

- wystawianie water in the risers;

- unacceptable reduction of the temperature of hot water on the last floors of the buildings;

- the occurrence of undesirable hydraulic regime, in which the water in the Naib is more remote risers moves in the opposite direction.

Kind of inverse relation ω(Q/Qb) if ω>ωminmay be different.

In particular, when Qbare chosen so that when Q=Qbω(Q/Qb)=0, an inverse relationship when ω>ωmincan be in the form (see figa)

where ωmax- the maximum value of the adjustable speed circulation pump. The value of Qbit is advisable to choose in range (0,7÷1,4) of the water flow, measured in the period of maximum water consumption. At smaller values of Qbthe rotation frequency ω and the circulation rate decrease with increasing water too quickly, which reduces the comfort mode hot water for the above reasons. For large values of Qbreduced savings of thermal energy.

On figb shows the dependence of ω(Q/Qbin case of restriction of the rotation frequency ω minimum value of ωminwhen Q>Qb. For ω>ωmin and Q<Qbthe dependence of ω(Q/Qb) is

Limitation on speed top-level ωmaxunit 7 provides either by the nature of the relation ω(Q)which takes the value ωmaxwhen Q=0, or by comparing the results of ω with constant ωmaxentered in block 7 on input 12. This avoids excessive particularly the energy at small separation.

When upgrading an existing hot water system is ωmaxselect equal to (0.9 to 1.0) nominal speed of the pump 4, provide an unregulated drive. This is due to the fact that its rated speed and, accordingly, the water flow in the circulation loop existing systems but the known methods, as a rule, exceed the values required from the comfort of heat.

Figure 3 shows the dependence of heat capacity Rcircusgiven the circulating water, and a total thermal capacity of the Ptotalspent on hot water, the ratio Q/Qbwhen the circulation pump with a constant speed (dashed line) and with a rotational speed, which is in inverse dependence on the ratio Q/Qb. The shaded area corresponds to the reduction of thermal power and energy requirement.

As can be seen from the above, when the system is in the proposed method, the actuator operates with reduced average power, which reduces energy consumption.

The effectiveness of the proposed solutions have been verified experimentally.

1. The way to reduce the consumption of thermal and electric energy in the circulating hot water system, namely, that by measuring the t water consumption for hot water, regulate the speed of the circulation pump in reverse based on measured water consumption for hot water supply to the base value of consumption and limit adjustable speed minimum value.

2. The method according to claim 1, characterized in that the inverse relationship is

where ω is the rotational speed of the circulating pump, Q - measured water consumption for hot water, Ob- the base value of consumption, ωmax- the maximum value of the adjustable speed.

3. The method according to claim 2, characterized in that the base value of consumption is set equal to (0,7÷1,4) from water consumption for hot water supply in the period of maximum water consumption.

4. The method according to claim 2, characterized in that the value of ωmaxset equal to (0,9÷1,0) from the nominal speed of the pump.

5. The method according to claim 1, characterized in that the minimum value of the adjustable rotation frequency is chosen equal to (0,05÷0,3) from the nominal speed of the pump.



 

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