JPS5839338Y2 - Refrigeration/heating equipment - Google Patents

Description

[Detailed explanation of the invention] This invention is a refrigeration system that has high heat recovery efficiency, excellent operational efficiency, and can stably and fully utilize the equipment capacity.
Regarding heating equipment.

In item count stores, etc., it is necessary to keep the product display cases cold and to heat the room at the same time in the winter. There are many economic disadvantages, such as the fact that each device is made up of independent and dedicated equipment, which does not allow for high equipment costs, and running costs soar because there is no way to recover heat between the same equipment. I didn't like it.

In order to address these conventional problems, the present invention organically combines a compression refrigeration type refrigeration system that uses an air-cooled condenser and a compression refrigeration type heating system that uses an air heat source to enable heat recovery. This led to the devising of a refrigeration/heating system with a new structure that made it possible to reduce equipment costs and operating costs, and in particular, the air heat sources of refrigeration and heating systems each formed into a compression refrigeration cycle. The side heat exchanger is configured with a single heat exchanger of two refrigerant systems that share fins, and the heat exchanger tube group on the heating device side is interposed between the heat exchanger tube group on the refrigeration device side for heat exchange. The present invention is characterized by a configuration in which a blower attached to the single heat exchanger is configured to stop blowing air when the same device is operated simultaneously.

The invention will be further explained in detail below by means of embodiments shown in the accompanying drawings.

FIG. 1 is a refrigeration circuit diagram according to an example of the device of the present invention,
It consists of a refrigeration device 1 formed by a compression refrigeration cycle, and an air conditioner 2 as a heating device 2 also formed by a compression refrigeration cycle.

The refrigerator 1 includes a compressor 3. Receiver 4. Consists of an air-to-air heat source side heat exchanger 5 (hereinafter referred to as an air-cooled condenser 5), an expansion valve 6, and a user side heat exchanger 7 (hereinafter referred to as an evaporator 7),
The evaporator 7 is housed in a showcase 20, and the evaporator 7 is used as a cooler by flowing a refrigerant in the direction of the arrow shown in the figure.

On the other hand, the air conditioner 2 has a compressor 8. Four-way switching valve 9, liquid receiver 10. A heating expansion valve 11 in which a check valve 13 is provided in parallel. A cooling expansion valve 12 in which a check valve 14 is provided in parallel. Air use side heat exchanger 1 with indoor fan 19
5 (hereinafter referred to as the indoor coil 15), and an air-to-air heat source side heat exchanger 16 (hereinafter referred to as the outdoor coil 16). By acting on the evaporator, the refrigerant flows as shown by the solid arrow line to operate as a heating device)
In addition, by operating the indoor coil 15 as an evaporator and the outdoor coil 16 as a condenser, it is operated as a cooling device (refrigerant flows as shown by the broken arrow line) to heat or cool the room.

In this device, the air-cooled condenser 5 and the outdoor coil 16 are connected to a single heat exchanger 17 having two refrigerant systems that share fins.
At the same time, a blower 18 with variable air volume is attached and installed outdoors to enable heat exchange between the outdoor air and the two systems of refrigerant.

Since this single heat exchanger 17 shares fins, it is of course possible to exchange heat between the refrigerants of both the refrigerator 1 and the air conditioner 2.
It is equipped with two fans 18a and 18b, and the air volume can be adjusted in three stages: high air volume when both fans are operated simultaneously, low air volume when one fan is operated, and no air volume when both fans are stopped.
In addition, it is of course possible to adjust the air volume stepwise or steplessly by controlling the rotation speed of one fan.

Furthermore, as the structure of the single heat exchanger 17 is shown in FIG. The heat exchanger tubes 51 are interposed between the heat exchanger tubes 51 and extend through the common fins.

Next, referring to Figure 3, we will explain the electric circuit that controls the operation of the refrigeration/heating system with the above structure. Of the circuits divided into three by the two-dot chain line, the cloth section A is for the operation of the air conditioner 2. The middle part of the circuit is an operating circuit for the refrigerator 1, and the left part C is an operating circuit for the blower 18.

The driving circuit A includes an electromagnetic contactor 21 for starting and stopping the motor of the compressor 8. The electromagnetic coil 22 of the four-way switching valve 9 (energized during the heating cycle), the motor 2 of the indoor fan 19
3. Cold/warm selector switch 24. Switch 25a, 2
5b, a room temperature detection thermostat 26, an electromagnetic relay 27 with four contacts 278 to 27d, and an electromagnetic relay 28 with two contacts 28a and 28b. Contactor 21 is switch 2
5a is turned on, and is turned on by the electromagnetic relay 27, which is energized when the room temperature is high during cooling and when the room temperature is low during heating, and drives the compressor 8, while the four-way selector valve 9 and What is the electromagnetic relay 28? The cold/warm selector switch 24
It is energized by inputting it into the heating side.

Furthermore, the indoor fan 19 is operated to continuously blow air when the switch 25b is turned on.

The operating circuit port for the refrigeration system includes an electromagnetic contactor 29 for starting and stopping the motor of the compressor 3. A fan motor 30 installed inside the showcase 20. Showcase temperature detection thermo 31
, an electromagnetic relay 3 having four contacts 32 a to 32 d.
2, the electromagnetic contactor 29 is a showcase 20
An electromagnetic relay 32 that is energized when the internal temperature is high drives the compressor 3, while the showcase fan is operated to continuously blow air.

The air blower operation circuit c is for the two fans 18a, 18.
This circuit is for controlling each of the motors 33 and 34 in b, and includes both motors 33 and 34 and an electromagnetic relay 35 having one contact 35a, and operates as described below.

That is, in the summer when indoor cooling is required, when the room temperature is high and the electromagnetic relay 27 is energized, and when the showcase 20
Both motors 33
, 34, and the fans 18a, 18b are operated to blow air.

On the other hand, in the winter when indoor heating is required, when the room temperature is low and the electromagnetic relay 27.35 is energized, and when the temperature inside the showcase 20 is low and the electromagnetic relay 32 is de-energized, the temperature inside the showcase 20 is When the temperature is high and the electromagnetic relays 32 and 35 are energized, and when the room temperature is high and the electromagnetic relay 27 is de-energized, both motors 33 and 34 are energized and the fan 18a is activated. , 18b are operated to blow air.

In short, in the summer, the blower 18 continues to operate, except when the devices 1 and 2 are stopped because the room temperature and the temperature inside the showcase are low. In the winter, when either the refrigerator 1 or the air conditioner 2 is operating, the blower 1
8 continues the blowing operation, and also stops the blower 18 when both the devices 1 and 2 are operating.

In the summer, the device of the present invention, which has a diagonal configuration, has no evaporator 7.
The latent heat of evaporation taken by the indoor coil 15, which acts as an evaporator, is effectively radiated by the single heat exchanger 17 with a large cooling capacity and a sufficient amount of air flow, resulting in stable and high-capacity refrigeration operation. is threatened.

On the other hand, in winter, when only the refrigerator 1 is operating and when only the air conditioner 2 is in heating operation, the blower 18 is in blowing operation, so in the former case, the single heat Sufficient heat radiation is performed by the air-cooled condenser 5 of the exchanger 17, and in the latter case, sufficient heat absorption is performed by the outdoor coil 16, so that high-capacity refrigeration operation is stably performed.

Furthermore, when the devices 1 and 2 are operating simultaneously,
Since heat is recovered between the air-cooled condenser 5 and the outdoor coil 16 in the single heat exchanger 17, a high-capacity heat recovery refrigeration operation is performed even though the blower 18 is stopped.

Next, FIG. 4 is an electrical circuit diagram of a main part according to another example of the device of the present invention, in which the air volume of the blower 18 can be adjusted by making some circuit changes to the blower operation circuit C of the above example. That's what I do.

As is clear from the circuit configuration shown in Figure 4, the above circuit is
During the summer, it operates as follows.

(a) When only the refrigerator 1 is operating, contact 28b
, 28C, 32C, both motors 33, 34
is driven, and the blower 18 is operated at a high air volume.

(b) When only the air conditioner 2 is in cooling operation, both motors 33 and 34 are driven by closing the contacts 27 a , 27 e , and 28 b, and the blower 18 performs high air volume operation.

(C) When both the devices 1 and 2 are in operation, the blower 18 operates at a high air volume as in section (b).

On the other hand, in winter, it operates as follows.

(a) When only the refrigerator 1 is operating, the contact 27b,
By closing contact 28a and opening contact 28C, only one motor 34 is driven and the blower 18 is operated at a low air volume.

(b) When only the air conditioner 2 is in heating operation, both motors 33 and 34 are driven by closing the contacts 27 e , 28 a , and 32 b, and the blower 18 performs high air volume operation.

(C) When the same device 1 and 2 are both operating, contact 27b
, 32b are both opened, and the blower 18 is stopped.

As is clear from the above operation, when only the refrigerator 1 is operated, the refrigeration capacity is small, so the blower 18 only needs half the air volume. During operation, the blower 18 operates at a high air volume, and when the devices 1 and 2 are operated simultaneously in winter, the blower 18 is stopped.

Specific numerical values of the device having the structure and operation described above are listed below, and compared with the numerical values of the conventional individual operation type device.

First, design conditions are set as follows.

Under these conditions, the cooling load (Kcal/H) in summer is: 40,000-15,000 (cooling showcase) =
25,000, and the capacity of air conditioner 2 is 10.
It is considered to be equivalent to HP.

On the other hand, the heating load (Kcal/H) in winter is 24.00
0 + 10.000 (showcase cold) = 34
,000, and the ability is also considered to be equivalent to 15 HP.

As a result, the conventional system requires an air conditioner with a capacity equivalent to 15 HP, but the present invention combines a 30 HP refrigeration unit and the air conditioner 2 to perform heat recovery operation in the winter, reducing the operating rate ( Driving time rate per day) = 40%
Assuming that the efficiency (heat recovery efficiency) is 70% and the ratio of waste heat to capacity is 1.2, a heat amount of 40.000 x 1.2 x 0.7 x 0.4 = 13440 Kcal/H can be recovered.

Therefore, the required heating capacity is 34,000-13,440=2
0,600, and the capacity of air conditioner 2 is 10 HP.
Because of this, a refrigeration system with a capacity of 10 HP is sufficient for both cooling and heating.

As is clear from the above description, the present invention consists of a refrigeration system 1 and a heating system 2 using a compression refrigeration cycle.
The air-to-air heat source side heat exchangers 5 and 16 of the devices 1 and 2 are formed into a single heat exchanger of two refrigerant systems in which the fins are shared, and the heat exchanger tube group of the heating device 2 is formed into a refrigeration device. 1, and the blower 18 attached to the single heat exchanger is configured to stop blowing air when the heat exchanger 1 and 2 are operated simultaneously. In this case, the heat exchanger tubes in the heat source side heat exchanger 16 of the heating device 2 are sandwiched between the heat transfer tubes in the heat source side heat exchanger 5 of the refrigeration device 1, which enables combined cooling and heating operation using a heat recovery method. This has the advantage that heat exchange between both heat transfer tubes is improved and highly efficient heat recovery can be performed, and since the capacity of the refrigeration system can be reduced, equipment costs can be reduced.

Furthermore, by performing the heat recovery operation, there is no risk of frost forming on the heat source side heat exchanger 16 on the side of the heating device 2, and therefore, frost operation is not necessary.

In addition, since the blower 18 is stopped during heat recovery operation, quiet operation is achieved, the power saving effect is large, and it also contributes to preventing liquid from returning to the compressor on the side of the heating device 2. The present invention is a refrigeration/heating device with various practical advantages.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the device of the present invention, in which Figure 1 is a refrigeration circuit diagram, Figure 2 is a schematic perspective view of a single heat exchanger on the heat source side, and Figure 3 is an electric circuit. It is a diagram. FIG. 4 is an electrical circuit diagram of a main part of an example of the device of the present invention. 1...Refrigerating device, 2...Heating device, 5
, 16... Air heat source side heat exchanger, 18...
···Blower.

Claims (1)

[Scope of utility model registration request] Consisting of a refrigeration device 1 and a heating device 2 using a compression refrigeration cycle, each of the devices 1 and 2 has an air-to-air heat source side heat exchanger 5,
16 is formed into a single heat exchanger of two refrigerant systems in which the fins are shared, and the heat exchanger tube group of the heating device 2 is interposed between the heat exchanger tube group of the refrigeration device 1, while the A refrigeration/heating device characterized in that a blower 18 attached to a heat exchanger is configured to stop blowing air when the devices 1 and 2 are operated simultaneously.