Directly-heated type and circular type integrated heat-pump water heater system

Abstract

The invention provides a directly-heated type and circular type integrated heat-pump water heater system. According to the system, a directly-heated type hot water supply mode and a circular type hot water supply mode are provided simultaneously. The system is composed of a host machine, a heat transfer water tank, a water storage tank and corresponding control parts. By means of the system, defects of low energy efficiency and reliability caused by the high return water temperature and difficult control of a directly-heated type heat-pump water heater are overcome, and the system can operate in an efficient and high-reliable mode.

Description

technical field [0001] This patent relates to a heat pump water heater system. Background technique [0002] The heat pump water heater adopts the reverse Carnot cycle, uses the heat exchanger to absorb the heat of the low-temperature heat source, and uses the compressor to pump it into the water. Relevant preferential policies have been introduced, and according to the form of hot water provided, it can be divided into direct heating type and circulating heating type. [0003] Direct heating means that cold water directly enters the heat pump water heater, and the latter outputs hot water to the user or the water tank side, which has the characteristics of high efficiency and energy saving, and reduces the heat preservation water tank, etc., but the control is complicated and the outlet water temperature is not easy to stabilize. The water supply pressure of the tap water varies widely, and the temperature range of the incoming water from winter to summer is very large, wh...

AI Technical Summary

Problems solved by technology

Because the replenishment is on the side of the heat preservation water tank, the temperature of the water will drop rapidly due to the addition of cold water when users use it. In addition, if there is too much water in the heat preservation water tank, it will be wasted in vain due to cooling when not in use.

According to the specific heating method, it can be divided into two types: 1) Natural convection method, that is, the heat exchange coil is placed in the pressure-resistant and insulated water tank, and the water in the water tank is gradually heated to the set water temperature through the heat exchange coil. way, when the user uses it, since the replenishment water is below the water tank, the water outlet is above the water tank, and there is no great disturbance in the water tank, the hot water utilization rate is high, but due to the limited volume of the pressurized water tank, it is difficult to apply on a large scale. In addition, Since the heat exchange method of the heat exchange coil is natural convection, the heat transfer coefficient is small, and the energy efficiency is also very low; 2) The forced convection method, that is, the heat in the heat pump water heater is brought into the heat preservation water tank through the water pump, and the water in the heat preservation water tank is heated circularly , in this way, the system adopts the forced convection heat transfer method, and the heat transfer coefficient is high, but when the user uses it, such as starting the heat pump water heater and water pump, it is easy for the added cold water to affect the user's water consumption. In actual design, only Enlarging heat pump water heaters and water tanks to meet water requirements has resulted in huge waste

Images