Vehicle air conditioning system with evaporators cooling passenger compartment and e.g. hybrid drive battery, has single excess pressure relief valve

摘要

The coolant circuit (12) has a high pressure branch (20) connected to first and second evaporators (22, 24), the latter being downstream of the coolant circuit in the high pressure branch. A first expansion valve (30) is associated with each evaporator. A single excess pressure relief valve (35) is included in the high pressure branch (20). This valve (35) is in the section of the high pressure which precedes only the first evaporator. The excess pressure valve is in parallel with the first expansion valve of the first evaporator.