Secondary heat pump combined system

Abstract

The invention provides a secondary heat pump combined system, which comprises a primary side heat pump system, a secondary side heat pump system and a hot water storage side system. The primary side heat pump system is connected with the secondary side heat pump system through a first plate heat exchanger. The secondary side heat pump system is connected with the hot water storage side system through a second hot water storage tank. The system is provided with a heating operation mode, a refrigeration operation mode and a defrosting operation mode to prevent frost crack operation and overheating operation of the hot water storage tank, wherein the heating operation mode is further divided into a heat pump heating operation mode, a heat pump heat storage operation mode and a hot water storage tank heating operation mode; the refrigeration operation mode is divided into a pure refrigeration operation mode and a refrigeration plus domestic hot water operation mode. The modes can be freely switched according to the needs and the conditions. The off-peak electricity and low-cost electricity at night are fully used. The secondary heat pump combined system has the advantages of flexible control, diversified selection, energy saving during operation and the like.

Description

technical field [0001] The invention relates to a heat pump, in particular to a secondary heat pump composite system. Background technique [0002] With the rapid development of my country's economy, building energy consumption is increasing day by day with the growth of building area. Among them, reducing the energy consumption of HVAC and domestic hot water systems is of vital significance to alleviate environmental pollution and resource shortage. [0003] Air source heat pump is one of the most widely used heat pump types at present, but its heating performance will drop sharply with the decrease of outdoor temperature, especially in severe cold areas, when the unit is running in winter, defrosting will increase a lot of energy consumption, so the air The single use of source heat pumps is restricted by conditions. It has technical defects such as small application range and relatively poor reliability. [0004] Although the subsequently developed cascade heat pump sy...

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Problems solved by technology

[0007] The invention discloses a secondary heat pump composite system with a hot water storage tank, the purpose of which is to overcome the air source heat pump caused by the existing air source heat pump system, cascade heat pump system, ice cold storage and water cold storage system Limited operating conditions and poor reliability; cascade heat pump structure, complex control, and high cost; energy storage technologies such as ice storage and water storage systems are limited to the cold source side and other application defects, changing the peak load of the traditional air-conditioning water heater system. Disadvantages of economical inefficiency

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