Air-energy heat pump water heater

Abstract

The invention discloses an air-energy heat pump water heater. The air-energy heat pump water heater comprises a heat exchanger, namely a heat exchange sleeve, a water storage tank, a water flow sensor, a wall-hanging stove two-position three-way valve, electric control equipment, corresponding connecting pipes and corresponding valve pieces; the heat exchange sleeve is composed of a water pipe and a refrigerant metal pipe, and the refrigerant metal pipe in the heat exchange sleeve penetrates the middle portion of the water pipe of the heat exchange sleeve to be coiled to into a cylinder so as to be arranged outside an inner container of the heat retaining water storage tank in a sleeving manner and arranged in a heat retaining layer of an outer shell of the water storage tank in a sleeved manner; the refrigerant pipe in the heat exchange sleeve of the heat exchanger is connected with a throttle valve, an evaporator and a heat pump compressor through metal pipes, and therefore an overall heat pump heating system loop is formed; and the heat exchange sleeve is further composed of two parts including a high temperature heat energy rapid convection release area and a medium and low temperature heat energy slow liquidation release area. According to the air-energy heat pump water heater, the energy efficiency ratio of hot water produced by a heat pump is high, the water producing temperature within rated power of the heat pump is high, the problem of defrosting of the heat pump water heater in winter is solved, and the air-energy heat pump water heater has the beneficial effects of being small in size of the water storage tank, low in cost, long in service life and the like.

Description

technical field [0001] This technology involves an air energy heat pump water heater system. Specifically, it uses a heat pump unit to absorb low-grade heat energy from the environment with a share of electric energy and equipment. After being compressed by a compressor, it can heat tap water to within the rated power of the heat pump. 70 ℃, can get an average of more than 5-7 parts of heat energy including the electric energy used. Background technique [0002] At present, water heaters are generally high-energy-consuming electric water heaters and gas water heaters. With the increasing shortage of global energy, gas shortages occur year by year for heating gas in northern my country in winter. Continuous air pollution, smog weather, energy conservation and emission reduction have become the government, It is a hot topic that the media and the people pay close attention to. However, air energy water heaters, an energy-saving bathing product that is widely admired by many co...

AI Technical Summary

Problems solved by technology

[0003] 1. The temperature of the produced water in the existing commercially available heat pump water heaters is generally low, generally 55°C, and this temperature can only be reached when the rated power is exceeded;

[0004] 2 The energy efficiency ratio of existing heat pump water heaters on the market is generally low, generally around 3.7; in order to improve the energy efficiency ratio of many brands, the area of ​​the heat pump evaporator is made about 50% larger than the area of ​​the evaporator of the outdoor unit of the household heating and cooling air conditioner. The machine is a huge cube, and it is difficult to install it on the outer wall of users above the second floor with a tripod;

[0005] 3. Due to the low water temperature and low energy efficiency ratio of existing commercially available heat pump water heaters, the volume of the water storage tank must be relatively large, generally more than 200 liters. The demand for water and huge water storage tanks are generally unacceptable for small and medium-sized families who have no place to install them. This has become the biggest bottleneck for the popularization of air-energy water heaters into households;

[0006] 4 Existing heat pump water heaters on the market have a short service life: the heat exchange method built in the water storage tank, or the heat exchange method of the external water pump cycle, the heat pump compressor is installed, and it works in the harsh environment of high temperature and high pressure for a long time, causing the compressor Working for a long time when the temperature rise exceeds the upper limit of the rated temperature rise, the high temperature will cause the insulation resistance of the compressor motor coil to decrease, accelerate aging, the refrigeration oil will become thinner, reduce the lubrication effect, and accelerate the wear of moving parts. Repeatedly, it will also cause carbon formation in the oil; If the thermowell is in high-temperature hot water for a long time, it is easy to scale, resulting in a decrease in heat exchange efficiency, and even a breakage of the heat exchange sleeve, which shortens the service life and relatively increases the cost of use for users;

[0007] 5. Existing commercially available heat pump water heaters must be defrosted regardless of the ambient temperature. It is difficult to accurately judge whether the system needs to be defrosted and when to enter the defrost. Defrost, incomplete defrost, long defrost time, affect hot water temperature and many other disadvantages: Due to the built-in water storage tank, or the heat exchange mode of external water pump circulation, as the temperature of hot water gradually increases, the discharge of the heat pump compressor The air temperature and exhaust pressure will also rise accordingly. When the exhaust temperature and exhaust pressure reach the upper limit, the fan will have to stop running. As a result of the fan stopping, the energy efficiency ratio of the heat pump to produce hot water will drop by three points. For two or more, the evaporator absorbs very little heat from the environment because the fan stops running, and soon the evaporator will be covered with frost, and the heat pump system will have to defrost, resulting in a lot of energy waste; and the return air temperature before the throttle valve, Basically the same temperature as the hot water in the storage tank, that is to say, as the water temperature rises, the energy efficiency ratio also decreases linearly

[0008] 6 Existing heat pump water heaters on the market have a large water storage tank, which will inevitably increase the manufacturing cost and lead to an increase in the sales price. In addition, the large volume and no place for installation, high maintenance frequency during use, short life, low energy efficiency ratio, and limited power saving, Compared with using electric water heaters and gas water heaters, users think that it saves a lot of money and has a lot of trouble

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