JPH05157336A - Air-conditioning charge computing system - Google Patents

Abstract

PURPOSE:To compute the air-conditioning charge of a plurality of indoor machines fairly in response to capacity generated from the indoor machines. CONSTITUTION:Capacity generated from each indoor machine 2A, 2B, 2C is computed from the opening and operating time of electronic expansion valves 11A, 11B, 11C for the indoor machines 2A, 2B, 2C. The air-conditioning charges of each indoor machine 2A, 2B, 2C are computed by proportionally dividing the air-conditioning charges of all air conditioners in response to the capacity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning charge calculation system suitable for an air conditioner installed in an apartment, office building or the like.

[0002]

2. Description of the Related Art In apartments, office buildings, etc.,
As shown in FIG. 2, a plurality of indoor units 2A, 2B, and 2C (three units in the figure) installed in a plurality of rental rooms are installed in a single outdoor unit 1 installed on the roof, and refrigerant pipes 3A and 3B are installed. In some cases, an air conditioner, which is connected to each other in parallel through the air conditioner, is installed.

The outdoor unit 1 includes an inverter-driven compressor 4, a four-way valve 5, an outdoor heat exchanger 6, an outdoor blower 7, an accumulator 8 and the like. The indoor units 2A, 2B, 2C are equipped with indoor heat exchangers 9A, 9B, 9C, indoor blowers 10A, 10B, 10C, electronic expansion valves 11A, 11B, 11C, etc., respectively.

During the cooling operation of all the indoor units 2A, 2B, 2C, however, the gas refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 via the four-way valve 5 and is sent by the outdoor blower 7 there. It is condensed and liquefied by radiating heat to the outside air.
This liquid refrigerant flows in parallel to the indoor units 2A, 2B, 2C through the refrigerant pipe 3A, adiabatically expands by the electronic expansion valves 11A, 11B, 11C, and then the indoor blowers 10A by the indoor heat exchangers 9A, 9B, 9C. 10B,
It vaporizes and evaporates by cooling the indoor air sent by 10C. This gas refrigerant returns to the outdoor unit 1 through the refrigerant pipe 3B, passes through the four-way valve 5, the accumulator 8 and the compressor 4
Inhaled into.

During the heating operation of the indoors 2A, 2B, 2C, the refrigerant discharged from the compressor 4 passes through the four-way valve 5 and the refrigerant pipe 3B to the indoor unit.
2A, 2B, 2C in parallel, the indoor heat exchanger 9A, 9B,
After being condensed and liquefied at 9C, it is adiabatically expanded by the electronic expansion valves 11A, 11B and 11C. Then, this refrigerant returns to the outdoor unit 1 via the refrigerant pipe 3A and evaporates and vaporizes in the outdoor heat exchanger 6, and then returns to the compressor 21 via the four-way valve 5 and the accumulator 8.

When any of the indoor units 2A, 2B, 2C, for example 2C, is stopped or operated for blowing, its electronic expansion valve 11C
Is fully closed, and the capacities of the indoor units 2A, 2B in operation are adjusted by changing the openings of the electronic expansion valves 11A, 11B according to the loads on the indoor units 2A, 2B. And the indoor unit 2A,
The capacity of the outdoor unit 1 is adjusted by changing the inverter frequency of the inverter-driven compressor 4 according to the capacity of 2B.

In this type of air conditioner, the indoor unit 2A,
In order to calculate the air-conditioning charge for each 2B, 2C, the outdoor unit 1 and each indoor unit 2A, 2B, 2C are connected to the air-conditioning charge calculator 13 via the signal line 12 for the air-conditioning charge, and here, the air conditioner The indoor air conditioning charges (the majority of which is consumed by the drive of the inverter-driven compressor 4) are apportioned according to the cumulative operating time of each indoor unit 2A, 2B, 2C, and each indoor unit 2A, 2B , 2C
I was calculating the air-conditioning charge.

[0008]

In the conventional air-conditioning charge system, the air-conditioning charge for the entire air conditioner is proportionally divided according to the cumulative operating time of each indoor unit 2A, 2B, 2C. Since the charges were calculated, there was a problem that this air conditioning charge was not proportional to the capacity of each indoor unit and was therefore unfair.

[0009]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide one outdoor unit equipped with an inverter-driven compressor and an outdoor heat exchanger. In the air-conditioning charge calculation system for air conditioners, in which multiple indoor units equipped with indoor heat exchangers and electronic expansion valves are connected in parallel via refrigerant pipes, the electronic expansion valves for each indoor unit are opened. The air conditioning charge for each indoor unit is calculated by apportioning the air conditioning charge for the entire air conditioner according to the means for calculating the capacity output by each indoor unit from The air-conditioning charge calculation system is provided with a means for calculating.

[0010]

In the present invention, since it has the above-mentioned structure, the capacity output by each indoor unit is calculated from the opening of the electronic expansion valve of each indoor unit and the operating time, and the air conditioner is calculated according to this capacity. The air conditioning charges for each indoor unit are calculated by apportioning the overall air conditioning charges.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. The outdoor unit 1 and the plurality of indoor units 2A, 2B, 2C are connected to each other via a control signal line 20, and the control signal line 20 has a signal line.
An air-conditioning charge system 23 is connected via 21 and an interface 22.

However, the cooling or heating operation time of each indoor unit 2A, 2B, 2C and the opening of the electronic expansion valves 11A, 11B, 11C are controlled by the air conditioning charge system via the control signal line 20, the signal line 21 and the interface 22. 23 is input to the capacity calculating means 24, where the capacity output by each indoor unit 2A, 2B, 2C during the unit period, that is, the cooling operation time or the heating operation time and the electronic expansion valves 11A, 11B, 11C between them The product of the opening degree, in other words, the amount of refrigerant flowing through each of the indoor units 2A, 2B, 2C during the unit period is calculated. The output of the capacity calculation means 24 is input to the proportional division means 25, where the air-conditioning charge of the entire air conditioner (the power cost supplied to the inverter-driven compressor 4 during a unit period accounts for most) is given to each indoor unit. The air conditioning charges for each indoor unit 2A, 2B, 2C are calculated by apportioning according to the capabilities of 2A, 2B, 2C, and displayed or printed out on the output means 26A, 26B, 26C. Other configurations and operations are similar to those of the conventional one shown in FIG. 2, and corresponding members are designated by the same reference numerals. .

[0013]

According to the present invention, the air-conditioning charge for each indoor unit is calculated by apportioning the air-conditioning charge for the entire air conditioner according to the capacity of each indoor unit. It is possible to calculate fairly.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional air conditioning charge calculation system.

[Explanation of symbols]

 1 Outdoor unit 4 Inverter driven compressor 6 Outdoor heat exchanger 2A, 2B, 2C Indoor unit 9A, 9B, 9C Indoor heat exchanger 11A, 11B, 11C Electronic expansion valve 3A, 3B Refrigerant piping 23 Air conditioning charge system 24 Capacity calculation means 25 Proportional distribution means

Claims (1)

[Claims] 1. A plurality of indoor units equipped with an indoor heat exchanger and an electronic expansion valve are connected in parallel to one outdoor unit equipped with an inverter-driven compressor and an outdoor heat exchanger via a refrigerant pipe. In the air-conditioning charge calculation system for an air conditioner, the means for calculating the capacity output by each indoor unit from the electronic expansion valve opening of each indoor unit and the operating time, and the capacity of each indoor unit calculated by this means An air conditioning charge calculation system comprising means for calculating an air conditioning charge for each indoor unit by apportioning the air conditioning charge for the entire air conditioner according to the above.