JPS62288460A - Heat pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to a heat pump or a heat pump in which the power of the heat source water pump is not negligible compared to the heat pump power when a large amount of heat source water is transferred over a long distance. This invention relates to a heat pump that uses a limited amount of natural water as a heat source.

[Prior art]

Conventionally, when producing cold water and hot water using heat pumps that use natural water, the suction vanes of the compressor are used to deal with increases in heat source water temperature during partial loads or heating, or decreases in heat source water during cooling. Appropriate capacity control mechanisms such as adjustments were activated to respond to demands from the load side, but the amount of heat source water supplied to the condenser and evaporator was the same as the flow rate at full load.

[Problem that the invention seeks to solve]

However, in the conventional systems as described above, the amount of heat source water taken in is constant regardless of the size of the load or changes in the heat source water temperature, so it is not possible to reduce the power of the heat source water pump, and the amount of heat source water is If there is a limit to the amount of heat source water, valuable heat source water energy is wasted when the partial load or heat source water temperature changes, making it impossible to use energy effectively.

The present invention solves the above-mentioned problems of the conventional ones, reduces the power of the heat source water pump, and prevents the effective heat of the heat source water from being released unused, thereby making effective use of energy. The purpose is to provide a heat pump that can measure the

[Means for solving problems]

The present invention is a means for solving the above-mentioned problems of the conventional ones by using natural water for cooling and heating. In a heat pump that uses heat source water for heat A, a flow rate adjustment mechanism that adjusts the intake amount of the heat source water and a discharge temperature of the heat source water are detected, and the discharge temperature becomes a predetermined temperature that can be used by the heat pump. It is an object of the present invention to provide a heat pump characterized in that it is equipped with a temperature control mechanism that adjusts the amount of water intake by operating the flow N adjustment mechanism.

[For production]

By configuring the present invention as described above, when the load decreases, the amount of water intake is reduced accordingly, and the heat possessed by the heat source water is fully utilized until the temperature of the heat source water reaches a predetermined temperature that can be used as a heat pump. Therefore, by reducing the power of the heat source water pump and minimizing the consumption of heat source water, a limited amount of energy can be used effectively.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Regarding embodiments of the present invention, an example of producing hot water, that is, using heat source water as a heat source, will be described with reference to the drawings.

In Fig. 1, 1 is a compressor, 2 is its driver, 3 is a condenser, 4 is an evaporator, 5 is a receiver, 6 is a pressure reducing valve, 7 is a condenser tube, 8 is a hot water inlet pipe, 9 is a hot water outlet 10 is an evaporator tube, 11 is a heat source water inlet pipe, 12 is a heat source water outlet pipe, and 13 is a heat source water pump, which pumps up the heat obtained from the heat source water in the evaporator 4 and gives it to hot water in the condenser 3. It looks like this.

The load condition is detected by the hot water outlet temperature, and the capacity control mechanism 15 is controlled by the temperature regulator 14 so that the hot water outlet temperature becomes a predetermined temperature.

Reference numeral 16 denotes a drive machine for driving the heat source water pump 13, which adjusts the flow rate by changing the rotational speed, and together with the heat source water pump 13, forms a flow rate adjustment mechanism that adjusts the intake amount of heat source water by gJR. Temperature control 17 detects the discharge temperature of the heat source water in the heat source water outlet pipe 12, and adjusts the amount of water intake by operating the flow rate adjustment mechanism so that the discharge temperature becomes the lowest predetermined temperature that can be used by the heat pump. It is a temperature regulator as a mechanism.

To explain the operating state, it is assumed that at full load, the heat source water pump 13 rotates at the rated rotation speed and its flow rate is Wo. At this time, the water intake amount is also Wo, and the heat source water inlet temperature at the inlet of one generator 4 is the same as the water intake temperature, and this is set as tl. The heat source water outlet temperature at the outlet of the evaporator 4 is the same as the discharge water temperature, and the flow rate W0 is selected for the load so that this temperature becomes the lowest predetermined temperature t0 that can be used by the heat pump.

At this time, if the amount of heat given to the refrigerant in the evaporator 4 is Qo, then Qo = Wo (j+ to ) +
It becomes 11.

Next, when the hot water load becomes a partial load, the temperature controller 14
Due to this action, the capacity control mechanism 15 acts to reduce the opening degree of the suction vane of the compressor 1, for example, to reduce the heat pump capacity. Then, the amount of heat transferred in the evaporator 4 decreases, and the heat source water outlet temperature (same as the discharge temperature) becomes to
is greater than (2).

At this time, if the amount of heat given by the heat source water to the refrigerant is Q, then Q+ -Wo (t+ t2) (
It will be 21. At this time, the discharge temperature [2] is detected, and the temperature regulator 17 is activated to operate the driver 16 and the heat source water pump 13 to adjust the flow rate to such an extent that the discharge temperature drops to to again! Let w+.

At this time, the amount of heat given by the heat source water to the refrigerant is Q, which is the same as in case (2), and the relationship with temperature is Q+ -W+ (t+ to) (3
It becomes 1. That is, the :fL amount Wl is 1.-1°.

At this time, the heat of the heat source water is effectively used to the maximum extent that can be used by the heat pump, the flow rate is reduced, and the resistance of the piping system is reduced due to the decrease in the flow rate, so the heat source water pump 13 The driving power is reduced, which can save energy.

The power on the heat pump side increases when the outlet temperature of the heat source water, which is related to the outlet temperature of the evaporator 4, decreases from L2 to 1°, but if the amount of decrease in the power for transferring the heat source water is large, the overall Power is reduced and energy can be saved.

The upper half of Figure 2 shows the driving power of the heat source water pump 13, and the lower half shows the heat pump power, where (a) shows the power at the time of design for full load, and (b) shows the power of the conventional one at partial load. , the heat pump power has decreased by 6M8, but the heat source water pump power has not decreased. (C) of the figure shows the case in this example, and the heat pump power has increased by 6M0 compared to (b) However, the heat source water pump power decreases by ΔM, and ΔM, > ΔM,
In the case of p, the power is reduced as a whole compared to the conventional one, and energy saving can be achieved.

FIG. 3 shows an example in which the power of the heat source water pump is negligible compared to the power of the heat pump, and the consumption of heat source water is minimized. A bypass 18 is provided between the evaporator inlet pipe 19,
A portion of the heat source water is circulated through the flow paths of the evaporator tube 10, the evaporator outlet pipe 20, the three-way valve 21 bypass 18, and the heat source water pump 13.

22 is a three-way valve 21 which is a 2IT quantity adjustment mechanism that detects the heat source water temperature (same as the discharge temperature) of the evaporator outlet pipe 20 and adjusts the heat source water temperature to the lowest predetermined temperature t0 that can be used in the heat pump. This is a temperature regulator as a temperature control mechanism that adjusts the amount of water intake by operating the water.

In the case of full load, the bypass 1st is cut off, and the heat source water intake amount in this case is the same as the flow rate W0 of the heat source water pump 13 (in this embodiment, the heat source water pump 13 is a constant flow pump), The water intake temperature and the evaporator inlet temperature are both tl. The flow rate W0 of the heat source water pump 13 is adjusted so that the evaporator outlet temperature and discharge temperature of the heat source water are the same (to, which is the lowest predetermined temperature that can be used as a heat pump).
is selected.

At this time, the amount of heat Q0 given by the heat source water to the refrigerant in the evaporator 4 is Q* = Wo (tl to ) +
It will be 51.

In the case of partial load, the temperature at the heat source water outlet of the evaporator 4 rises to 1z. At this time, the amount of heat Q given to the refrigerant is: Q+ = Wo (tl Lx) +
It becomes 61. Therefore, by detecting this heat source water outlet temperature (same as the heat source water discharge temperature), the temperature regulator 22 is activated, and the three-way valve 21 is operated to flow the flow fi w w that becomes the bypass 18 and mix it into the heat source water. Then, the water intake amount is reduced, and the heat source water inlet temperature of the evaporator 4 is lowered, so that the heat source water outlet temperature, that is, the discharge temperature, becomes to again. At this time,
The flow rate W of the bypass 18 is 1, -10, and the intake amount W of heat source water is 1, -1°Ws = Wo (81 1, -10).

In FIG. 3, tp is the heat source water temperature in the heat source water pump 13 when the bypass 18 is used, and if tp is used, the flow rate W8 of the bypass 18 and the intake amount W of the heat source water are: t, -tp w, = -we (911, -1°.

In this manner, also in this embodiment, the amount of water intake is reduced during partial load, and the heat present in the heat source water can be effectively utilized.

〔Effect of the invention〕

According to the present invention, when the supply load of cold and hot water decreases or when the heat source water temperature changes and the heat pump is operated at partial load, the power of the heat source water pump can be reduced, and the heat contained in natural water, which is the heat source water, can be reduced. It is possible to provide a heat pump that can make full use of energy and use it effectively, and in particular, in the case of limited natural water, can effectively utilize energy and prevent wasteful loss, which has an extremely large practical effect. play.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention; FIG. 1 is a flow diagram, FIG. 2 is a diagram showing the difference from the conventional power, and FIG. 3 is a flow diagram of another embodiment. ■...Compressor, 2...Driver, 3...Condenser, 4
...Evaporator, 5...Receiver, 6...Residual pressure valve, 7
...Condenser tube, 8...Hot water inlet pipe, 9...
Hot water outlet pipe, IO... Evaporator tube, 11... Heat source water inlet pipe, 12... Heat source water outlet pipe, 13... Heat source water pump, 14... Temperature controller, 15... Capacity control mechanism, 16...Driver, 17...Temperature controller, 18
...Bypass, 19...Evaporator inlet pipe, 20...
Evaporator outlet pipe, 21... Three-way valve, 22... Temperature controller.

Claims (1)

[Claims] 1. A heat pump that uses natural water as a heat source water for cooling and heating, comprising: a flow rate adjustment mechanism that adjusts the intake amount of the heat source water; and a flow rate adjustment mechanism that detects the discharge temperature of the heat source water, and detects the discharge temperature of the heat source water. 1. A heat pump comprising: a temperature control mechanism that adjusts the amount of water taken in by operating the flow rate adjustment mechanism so that the water reaches a predetermined temperature that can be used by the heat pump.