High-temperature water source heat pump unit

Abstract

Disclosed is a high-temperature water source heat pump unit. Single-step compression refrigeration cycle and cascaded refrigeration cycle combined linkage technology is adopted, temperature of outgoing water of the unit can be increased to be higher than 85 DEG C by utilizing a low-temperature heat source to lower a compression ratio of the unit under a high-temperature working condition, efficiency of the unit is improved, working conditions of compressors are improved, and running reliability of the unit under the high-temperature working condition is guaranteed. The high-temperature water source heat pump unit is composed of a first compressor, a first heat exchanger, a first throttling element, a liquid storage device, a first one-way valve, a second one-way valve, an intermediate heat exchanger, a first electromagnetic valve, a second electromagnetic valve, a second compressor, a second throttling element, a second heat exchanger and a connecting pipeline. By the high-temperature water source heat pump unit, high environmental-protection benefit and economic benefit can be achieved, waste gas and waste residues of a coal fired boiler are avoided from polluting surrounding environment, and coal transporting cost, coal storage site cost, dedusting cost, coal slag transporting and processing cost and the like are omitted; investment in building a heating system is saved, and the high-temperature water source heat pump unit is especially suitable for being used for building a central air conditioning heating system in northern cold areas.

Description

technical field [0001] The invention relates to a heat pump unit, in particular to a high-temperature water source heat pump unit which converts underground low-grade heat energy into high-grade heat energy, and belongs to the technical field of air conditioning. Background technique [0002] Coal-fired boilers as traditional heating in China not only have low energy efficiency, but also cause serious pollution to the atmosphere. Therefore, coal-fired boilers are being phased out in some cities, and oil and gas-fired boilers have high operating costs. Electric heating consumes a lot of electricity, which is less efficient and more expensive. However, the use of traditional air source heat pump air conditioning units for heat pump heating will be affected by the low ambient temperature in winter. If the temperature is lower than -5°C, the unit will run unstable and the heating capacity will decrease, making it difficult to meet the requirements of users. Water source heat pu...

AI Technical Summary

Problems solved by technology

[0002] Coal-fired boilers as traditional heating in China not only have low energy efficiency, but also cause serious pollution to the atmosphere. Therefore, coal-fired boilers are being phased out in some cities, and oil and gas-fired boilers have high operating costs. Electric heating consumes a lot of electricity, which is less efficient and more expensive

The use of traditional air source heat pump air conditioners for heat pump heating will be affected by the low ambient temperature in winter. If it is lower than -5°C, the unit will run unstable and the heating capacity will drop, making it difficult to meet user requirements.

Water source heat pump is an alternative way to solve heating and air conditioning with great technical and economic advantages. The maximum outlet temperature of traditional water source heat pump unit is 55°C (such as R22) or 65°C (such as R134a). Under working conditions, the working pressure is too high, the compression ratio is large, and the energy efficiency ratio is low. It is impossible to form a hot water temperature above 85°C, and limited by the operating limit of the compressor, the safety and reliability of the unit's long-term operation under high temperature conditions are low. For northern heating methods that cannot provide hot water with sufficient temperature, boilers are still needed as auxiliary heat sources

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