Heat pump assisted direct solar water heater

Abstract

The invention discloses a heat pump assisted direct solar water heater. The heat pump assisted direct solar water heater comprises a solar thermal collector, a heat preservation water tank, a water pump, a heat pump, a temperature sensor, a first electric three-way valve, a second electric three-way valve, a third electric three-way valve and a controller, so that a heat pump assisted heating loop of water of the whole tank, heat pump assisted heating loop of water of the upper part of the water tank, and a solar heat collection circulation loop are formed. Compared with the prior art, the heat pump assisted direct solar water heater has the advantages that: the heat pump assisted heating loop of water of the upper part of the water tank is formed, and the heat pump heats the upper part of the heat preservation water tank, so that a small amount of water is guaranteed at any time; and the heating position of the heat pump assisted heating loop of water of the whole tank is moved from the middle part of the heat preservation water tank to the lower part, namely close to the bottom of the heat preservation water tank, so that the water storage space of the lower part of the heat preservation water tank can be developed. The heat pump assisted direct solar water heater can meet the hot water using requirement of modern family, can meet the requirement on a small amount of hot water in kitchen and during washing at any time, and the requirement on a large amount of hot water during bath in the morning or evening, and has high utilization rate of solar energy and a good energy-saving effect.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a direct solar water heater assisted by a heat pump. Background technique [0002] Existing solar water heaters with auxiliary heating function are composed of solar collectors, heat preservation water tanks, auxiliary heaters, water pumps, temperature sensors and controllers, and are divided into two types: direct type and indirect type. There is one auxiliary heater, which is located in the middle of the pressure-bearing heat preservation water tank. There are two situations for the auxiliary heater to be opened and closed: timing start-at the set start time, if the tap water temperature in the heat preservation water tank is lower than the preset temperature, the temperature sensor sends a signal to the controller, and the controller starts the auxiliary heater to heat until the tap water temperature in the thermal insulation water tank reaches the preset temperature, and the controller...

AI Technical Summary

Problems solved by technology

The solar water heater with this structure has the following defects: First, when the solar water heater is normally only used for bathing (hot water is used regularly), if the solar energy is insufficient, the auxiliary heating can only heat the water in the heat preservation water tank above the middle, and the hot water supply capacity Only half of the time of solar heating, there is insufficient hot water supply; the second is that if the water heater needs to supply hot water at any time, the auxiliary heater is always on, and only the lower part of the heat preservation water tank can store solar energy, which reduces the efficiency of the solar water heater; Under water conditions, when hot water is needed temporarily, the heating time is long

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