A carbon dioxide heat pump device

Abstract

The invention discloses a carbon dioxide heat pump device, which comprises a compressor, a gas cooler, an oil heat exchanger, a first filter, a throttling device, an evaporator, and a gas-liquid separator sequentially connected to a main heating cycle pipeline. The CO 2 The heat pump device also includes an ice-melting circulation pipeline and a compressor connected to the ice-melting circulation pipeline, a third filter, a second electromagnetic valve, an evaporator, and a gas-liquid separator. When the bottom of the evaporator freezes, the second Solenoid valve, high temperature and high pressure CO 2 The gas passes through the third filter and the second solenoid valve from the outlet of the compressor, and enters the independent pipeline in the lower part of the evaporator to melt the ice layer at the bottom of the evaporator, and then the generated heat CO 2 The vapor returns to the gas return port of the compressor through the gas-liquid separator to form CO 2 Melting cycle of heat pump unit. CO of the present invention 2 The heat pump device operates at a low ambient temperature, which can realize rapid ice melting and make the heating operation of the system stable.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to CO 2 heat pump unit. Background technique [0002] CO 2 Heat pump technology uses natural CO 2 As a circulating working fluid, it adopts a transcritical circulation method to release heat under supercritical conditions. The heat release is a variable temperature process with a large temperature glide, which matches the required variable temperature heat source very well. It is a special kind of Lorenz cycle. [0003] CO 2 When heat pumps are used in low-temperature areas, there will always be frosting, especially in extremely cold areas. Due to the low temperature, the water after defrosting in the evaporator cannot flow away in time. Freezing, the ice layer will affect the heating capacity of the heat pump system. In the prior art, it has been proposed to introduce the outlet of the gas cooler into the subcooling section and go to the bottom of the evaporator to p...

AI Technical Summary

Problems solved by technology

[0003] CO 2 When heat pumps are used in low-temperature areas, there will always be frosting, especially in extremely cold areas. Due to the low temperature, the water after defrosting in the evaporator cannot flow away in time. Freezing, the ice layer will affect the heating capacity of the heat pump system

In the prior art, it has been proposed to introduce the outlet of the gas cooler into the subcooling section and go to the bottom of the evaporator to prevent freezing, but in a low temperature environment, the temperature of the inlet water is usually relatively low, and the CO 2 There is a large temperature glide in the heat exchange in the gas cooler, so that the gas cooler outlet CO 2 The temperature of the refrigerant and the inlet water is close to or slightly higher than that of the fluorine refrigerant, which has a higher outlet condensation temperature, and the outlet CO 2 After the refrigerant exchanges heat with the inlet water, the gas cooler exports CO 2 The temperature difference between the refrigerant and the ice layer is actually small, and the ice melting effect is average

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