Heat pump cycle

A circulation system and heat pump technology, applied in lighting and heating equipment, heating/cooling equipment, air handling equipment, etc., can solve the problems of unable to supply air for heating, unable to heat the air conditioning object space, etc., and achieve the effect of suppressing the durable life

Active Publication Date: 2015-03-11
DENSO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when it is judged that the flow rate of the refrigerant is insufficient when the outside air temperature is low as in Paten

Method used

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  • Heat pump cycle
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Embodiment Construction

[0028] Hereinafter, one embodiment of the present application will be described using the drawings. In the present embodiment, a heat pump cycle system (a vapor compression type refrigeration cycle system) 10 is applied to a vehicle air-conditioning apparatus 1 . The heat pump cycle system 10 functions to cool or heat the blown air sent to the vehicle interior as a space to be air-conditioned in the vehicle air-conditioning apparatus 1 . Therefore, the heat-exchanging object fluid of this embodiment is blown air.

[0029] In addition, the vehicle air conditioner 1 of the present embodiment is applied to an electric vehicle that obtains driving force for vehicle travel from a travel electric motor. In this electric vehicle, electric power supplied from an external power source (commercial power supply) is charged in a storage battery as a power storage unit when the vehicle is stopped, and electric power stored in the battery is supplied to an electric motor for running when t...

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Abstract

According to the present invention, a coolant shortage determination unit (S2, S3, S6, S8, S9) determines that a coolant shortage state is present when the high-pressure-side coolant pressure (Pd) between the discharge port of a compressor (11) and the entrance of the decompression unit (13) is lower than a predefined first reference pressure (KPd1), if the external air temperature (Tam) is equal to or higher than a predefined reference external air temperature (KTam); and determines that a coolant shortage state is present when the high-pressure-side coolant pressure (Pd) is lower than a predefined second reference pressure (KPd2), in a state in which the compressor (11) is in operation, if the external air temperature (Tam) is lower than the reference external air temperature (KTam). When the coolant shortage determination unit determines that a coolant shortage state is present, a compressor controller (S4) reduces the coolant discharge capacity of the compressor (11).

Description

[0001] This application claims priority based on Japanese application number 2012-146058 for which it applied on June 28, 2012, and uses the description content here. technical field [0002] The present application relates to a heat pump cycle system for heating a fluid by absorbing heat from an external air. Background technique [0003] Conventionally, there is known a vapor compression type refrigeration cycle system (heat pump cycle system) that is applied to an air-conditioning apparatus and cools blown air sent to a space to be air-conditioned. In this type of heat pump cycle system, when the flow rate of the refrigerant circulating in the cycle system decreases, such as when the refrigerant leaks to the outside or when the outside air temperature is low, the refrigerant circulates through the cycle system together with the refrigerant and returns The return amount of the refrigerating machine oil to the compressor decreases, which may adversely affect the durability ...

Claims

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Application Information

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IPC IPC(8): F25B49/02B60H1/32
CPCF25B49/02B60H1/00978F25B49/005F25B2500/222F25B2700/1931F25B2700/2106B60H1/00921
Inventor 田原敏博
Owner DENSO CORP
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