Heat pump system and method for operating it

Abstract

The invention relates to a heat pump system (2) for air conditioning a vehicle, in particular an electric or hybrid vehicle, having an air conditioning unit (8) which has an air conditioning evaporator (12) and a heating heat exchanger (14), for air conditioning a passenger compartment (10) of the vehicle, having a condenser (26), for transmitting heat from a refrigeration circuit (4) into a coolant circuit (6), having a chiller (46), for transmitting heat from the coolant circuit (6) into the refrigeration circuit (4), wherein the coolant circuit (6) has two branches (24, 33) which are parallel to one another downstream of a low temperature cooler (44), namely a heating branch (24) which can be shut off and in which the condenser (26) and the heating heat exchanger (14) are arranged, anda cooling branch (33), in which the chiller (46) and a low temperature heat exchanger (42) for cooling a vehicle component are arranged. The heat pump system (2) is characterized in that the low temperature cooler (44), the condenser (26) and the heating heat exchanger (14) are connected in series with respect to one another. In addition, the heat pump system (2) has a plurality of operating modes. Particularly flexible, inexpensive, robust and, above all, efficient air conditioning is realised on the basis of the special connection. Furthermore, the invention relates to a method for operatingthe heat pump system (2).

Description

technical field [0001] The invention relates to a heat pump system for air-conditioning a vehicle, in particular an electric vehicle or a hybrid vehicle, comprising an air-conditioning unit for air-conditioning a passenger compartment with an air-conditioning evaporator and a heating heat exchanger, for air-conditioning a passenger compartment Heat transfer from the refrigeration circuit to the condenser in the coolant circuit, Chiller for transferring heat from the coolant circuit to the refrigeration circuit with downstream cryocooler (NT-Kühler) Two branches connected in parallel to one another, namely a blockable heating branch, in which the condenser and the heating heat exchanger are arranged, and a cooling branch, in which the refrigerator and at least one vehicle component are arranged. Background technique [0002] A corresponding heat pump system is described in the applicant's unpublished application DE 102014217960. [0003] The following problem usually arises ...

AI Technical Summary

Problems solved by technology

[0003] The following problem usually arises in electric vehicles or hybrid vehicles: a continuous heat-generating internal combustion engine and a corresponding high-temperature cooling circuit are mostly absent and the heat required to heat the coolant for the purpose of heating the vehicle passenger compartment must be obtained from another one source acquisition

[0004] However, the different heat sources often have to be connected separately, resulting in complex wiring

To heat or cool the passenger compartment as required and simultaneously cool one or more power components, disadvantageously, complex wiring is required, often requiring the use of many lines and valves, especially expensive switching valves

In particular with regard to the air conditioning of the vehicle interior, different operating states often require corresponding settings in which the heat is to be introduced in each case differently into the vehicle interior and / or the environment, which in turn requires a large number of valves, especially complex valves. and expensive controls

This leads to high costs especially in electric vehicles, since here, as mentioned above, overall less heat is available and its efficient distribution is therefore all the more critical

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