WO-2026094645-A1 - TEMPERATURE ADJUSTMENT SYSTEM AND METHOD FOR CONTROLLING SAME

WO2026094645A1WO 2026094645 A1WO2026094645 A1WO 2026094645A1WO-2026094645-A1

Abstract

Provided is a temperature adjustment system that makes it possible to quickly commence heating without causing a temporary temperature decrease. A refrigerant circuit (3) of a vehicle air conditioning device (1) comprises a bypass flow path (15) that guides, to the upstream or downstream side of an evaporator (13) in a manner bypassing a condenser (11), refrigerant which has been discharged from a compressor (10). The control unit has a hot gas heating mode in which some of the refrigerant flows from the bypass flow path (15) and hot water that has flowed out of the condenser (11), with the compressor (10) as a heat source, is guided to a heater core (18) to heat air, and a high pressure refrigerant control mode in which, while the hot gas heating mode is carried out, the pressure of the refrigerant flowing through the condenser (11) is maintained to be a prescribed value or more.

Inventors

YAMAMOTO, HIROYUKI
UKAI, TETSUZO
NAKAGAWA, NOBUYA
KOBAYASHI, TAKAYUKI
ADACHI, TOMOYASU

Assignees

三菱重工サーマルシステムズ株式会社

Dates

Publication Date: 20260507
Application Date: 20251016
Priority Date: 20241029

Claims (4)

A refrigerant circuit having a compressor for compressing the refrigerant, a high-pressure heat exchanger for releasing heat from the refrigerant compressed by the compressor, an expansion valve for expanding the refrigerant that has released heat from the high-pressure heat exchanger, and a low-pressure heat exchanger for evaporating the refrigerant that has expanded in the expansion valve, A cooler core that cools the air introduced into the room, A heater core for heating the air introduced into the aforementioned room, A cooler core side heat transfer medium circulation channel for circulating the heat transfer medium between the cooler core and the low-pressure side heat exchanger, A heater core-side heat transfer medium circulation channel for circulating the heat transfer medium between the heater core and the high-pressure side heat exchanger, An external heat exchanger that exchanges heat between the heat medium introduced from the heat medium circulation channel on the cooler core side or the heat medium circulation channel on the heater core side and the outside air, A control unit that controls the compressor and/or the flow rate of the heat medium flowing through the heat medium circulation channel on the cooler core side and/or the flow rate of the heat medium flowing through the heat medium circulation channel on the heater core side, Equipped with, The refrigerant circuit includes a bypass channel that guides the refrigerant discharged from the compressor to the upstream or downstream of the low-pressure heat exchanger, bypassing the high-pressure heat exchanger. The control unit provides a hot gas heating mode in which a portion of the refrigerant flows through the bypass channel and the heat transfer medium discharged from the high-pressure side heat exchanger is guided to the heater core using the compressor as a heat source to heat the temperature-controlled object. While the hot gas heating mode is in operation, a high-pressure refrigerant control mode is in place to maintain the pressure of the refrigerant flowing through the high-pressure heat exchanger above a predetermined value. A temperature control system that has the following features.
The temperature control system according to claim 1, wherein the control unit has an outside air heat absorption mode in which, before the high-pressure refrigerant control mode, the flow of the heat transfer medium to the high-pressure side heat exchanger is stopped, and the heat transfer medium is circulated between the cooler core side heat transfer medium circulation channel and the external heat exchanger to absorb heat from the outside air.
The temperature control system according to claim 2, wherein the control unit has an outside air heat absorption stop mode that stops the flow of the heat transfer medium to the external heat exchanger when the amount of heat absorbed from the outside air in the outside air heat absorption mode falls below a predetermined value.
A refrigerant circuit having a compressor for compressing the refrigerant, a high-pressure heat exchanger for releasing heat from the refrigerant compressed by the compressor, an expansion valve for expanding the refrigerant that has released heat from the high-pressure heat exchanger, and a low-pressure heat exchanger for evaporating the refrigerant that has expanded in the expansion valve, A cooler core that cools the air introduced into the room, A heater core for heating the air introduced into the aforementioned room, A cooler core side heat transfer medium circulation channel for circulating the heat transfer medium between the cooler core and the low-pressure side heat exchanger, A heater core-side heat transfer medium circulation channel for circulating the heat transfer medium between the heater core and the high-pressure side heat exchanger, An external heat exchanger that exchanges heat between the heat medium introduced from the heat medium circulation channel on the cooler core side or the heat medium circulation channel on the heater core side and the outside air, A control method for a temperature control system equipped with, The refrigerant circuit includes a bypass channel that guides the refrigerant discharged from the compressor to the upstream or downstream of the low-pressure heat exchanger, bypassing the high-pressure heat exchanger. A hot gas heating mode is provided in which a portion of the refrigerant is flowed through the bypass channel, and the heat transfer medium that has flowed out of the high-pressure side heat exchanger is guided to the heater core using the compressor as a heat source to heat the temperature-controlled object. While the hot gas heating mode is in operation, a high-pressure refrigerant control mode is in place to maintain the pressure of the refrigerant flowing through the high-pressure heat exchanger above a predetermined value. A control method for a temperature control system having the following features.

Description

Temperature control system and its control method This disclosure relates to a temperature control system and a control method thereof, suitable for use, for example, in the air conditioning of a vehicle. Patent Document 1 discloses a vehicle air conditioning system equipped with a refrigerant circuit having a bypass channel that bypasses the condenser. The vehicle air conditioning system described in the same document discloses that, when starting heating at extremely low outside temperatures, it recovers heat from the battery or electric heater using a chiller to warm up the system and quickly start heating (Patent Document 1, [0382] and Figure 34). Furthermore, an assist-less warm-up mode is disclosed in which the heating expansion valve is closed and refrigerant is not allowed to flow to the condenser, but instead the refrigerant is allowed to flow to the chiller via a bypass channel (Patent Document 1, [0390] and Figure 35). This is a schematic diagram showing a vehicle air conditioning system according to the first embodiment of this disclosure, specifically illustrating the hot gas heating mode.This is a schematic diagram showing the first startup control.This is a schematic diagram showing the second startup control.This is a schematic diagram showing the third startup control.This is a flowchart illustrating the switching of startup control.This is a schematic diagram showing a modified example 1 of Figure 1.This is a modified example of Figure 1, Part 2, and is a schematic diagram showing a direct expansion system.This is a schematic diagram showing the case where the first startup control is performed in modified example 2 of Figure 7. Embodiments relating to this disclosure will be described below with reference to the drawings. [First Embodiment] The first embodiment of this disclosure will be described below with reference to Figure 1 and other figures. Figure 1 shows a schematic diagram of the vehicle air conditioning system (temperature control system) 1 according to this embodiment. The vehicle air conditioning system 1 includes a refrigerant circuit 3, a heat transfer medium circulation channel 5 on the heater core side, and a heat transfer medium circulation channel 7 on the cooler core side. The refrigerant circuit 3 comprises a compressor 10 for compressing the refrigerant, a condenser (high-pressure heat exchanger) 11 for condensing the refrigerant compressed by the compressor 10, an expansion valve 12 for expanding the refrigerant condensed in the condenser 11, an evaporator (low-pressure heat exchanger) 13 for evaporating the refrigerant expanded in the expansion valve 12, and an accumulator 14 for separating the refrigerant from the evaporator 13 into gas and liquid. For example, a scroll compressor or a rotary compressor can be used as the compressor 10. The operation of the refrigerant circuit 3 is controlled by a control unit (not shown). A bypass channel 15 is provided so that the refrigerant discharged from the compressor 10 bypasses the condenser 11. The upstream end of the bypass channel 15 is connected between the compressor 10 and the condenser 11, and the downstream end of the bypass channel 15 is connected between the expansion valve 12 and the evaporator 13. A bypass expansion valve 16 is provided in the bypass passage 15. The bypass expansion valve 16 expands the high-pressure refrigerant discharged from the compressor 10 and regulates the refrigerant flow rate through the bypass passage 15. The opening degree of the bypass expansion valve 16 is controlled by the control unit. As described above, by connecting the downstream end of the bypass passage 15 between the expansion valve 12 and the evaporator 13, the control unit can adjust the expansion valve 12 and the bypass expansion valve 16 to suppress variations in the enthalpy of the refrigerant drawn into the compressor 10. This allows the refrigerant that has flowed through the bypass passage 15 and the refrigerant that has flowed through the condenser 11 to be mixed inside the evaporator 13. The heater core-side heat transfer fluid circulation channel 5 primarily supplies hot water (heat transfer fluid, coolant) heated in the condenser 11 to the heater core 18, and returns the hot water that flows out of the heater core 18 to the condenser 11. An upstream three-way valve 20a is provided on the upstream side (upper side in Figure 1) of the heater core 18, and a downstream three-way valve 20b is provided on the downstream side (lower side in Figure 1) of the heater core 18. The opening degree of the upstream three-way valve 20a is controlled by the control unit, allowing hot water from the heater core side heat transfer medium circulation channel 5 and cold water from the cooler core side heat transfer medium circulation channel 7 to flow to the heater core 18. The downstream three-way valve 20b is controlled by the control unit, allowing hot water flowing out of the heater core 18 to flow to the heater core side heat