Heat management system for vehicle

Abstract

The present invention relates to a heat management system for a vehicle. The purpose of the present invention is to control the flow of a refrigerant between low-pressure-side heat exchangers in a serial or parallel manner according to an air-conditioning mode state such that the flow rate of the refrigerant introduced into each low-pressure-side heat exchanger can be controlled independently according to the air-conditioning mode state, and to ensure that the refrigerant is introduced into each low-pressure-side heat exchanger at an optimal flow rate according to each amount of heat. In order to accomplish such a purpose, the present invention provides a vehicle heat management system having a heat pump-type refrigerant circulation line for producing hot or cold air according to the direction of flow of a refrigerant, thereby cooling / heating a specific air-conditioning region. The vehicle heat management system comprises: a compressor for suctioning, compressing, and discharging a refrigerant; a high-pressure-side heat exchanger for releasing heat from the refrigerant discharged by the compressor; an outdoor heat exchanger for causing heat exchange between the refrigerant and air outside a vehicle room; an expansion valve for pressure-reducing the refrigerant flowing out of the high-pressure-side heat exchanger or the outdoor heat exchanger; and at least one low-pressure-side heat exchanger for evaporating the pressure-reduced refrigerant. The outdoor heat exchanger and the low-pressure-side heat exchanger are connected in series or parallel according to the air-conditioning mode.

Description

technical field [0001] The present invention relates to a vehicular thermal management system, and more particularly, to a vehicular thermal management system capable of controlling refrigerant between series or parallel low-pressure side heat exchangers according to an air-conditioning mode state The flow rate of the refrigerant introduced into the corresponding low-pressure side heat exchanger is independently controlled according to the state of the air-conditioning mode, and the refrigerant is introduced into the corresponding low-pressure side heat exchanger at an optimal flow rate suitable for the corresponding low-pressure side heat exchanger middle. Background technique [0002] Examples of environmentally friendly vehicles include electric vehicles, hybrid vehicles, and fuel cell vehicles (hereinafter collectively referred to as "vehicles"). [0003] Such as figure 1 As shown, such a vehicle is equipped with an air conditioner 1 for cooling and heating the air-con...

AI Technical Summary

Problems solved by technology

The low-pressure-side heat exchanger 3f thus connected has a disadvantage that the refrigerant subjected to pressure loss while passing through the upstream-side outdoor heat exchanger 3d is introduced into the low-pressure-side heat exchanger 3f

This causes a problem that the cooling performance of the low-pressure side heat exchanger 3f decreases

[0009] Furthermore, since the low-pressure side heat exchanger 3f has a structure in which the refrigerant that has passed through the upstream-side outdoor heat exchanger 3d is introduced into the low-pressure side heat exchanger 3f, there are Disadvantages of limiting the flow rate of the introduced refrigerant

[0010] Due to this disadvantage, there is a problem that the refrigerant cannot be introduced into the respective low-pressure side heat exchangers 3f at an optimum flow rate suitable for the heat capacity that the respective low-pressure side heat exchangers 3f have.

This leads to the disadvantage of reduced cooling performance of the corresponding low-pressure side heat exchanger 3f

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