Heat Pump Assisted Indirect Solar Water Heater

Abstract

The invention discloses a heat pump auxiliary indirect solar hot water machine which comprises a solar thermal collector, a heat-preservation water tank, a heat medium pump, a heat pump, a water pump, an expansion tank, a temperature sensor, a first motor-driven three-way valve, a second motor-driven three-way valve and a controller, thus a solar heat medium heating forced circulation loop, a heat pump auxiliary heating loop of full tank of water and a heat pump auxiliary heating loop of water tank upper part water are respectively formed. Compared with the prior art, for the heat pump auxiliary heating loop of water tank upper part water, the heat pump heats up the upper part of the heat-preservation water tank, and less water use is ensured at any time; and the heating position of the heat pump auxiliary heating loop of full tank of water is moved from the middle part to the lower part of the heat preservation water tank, i.e., the heating position is much closer to the bottom part of the heat-preservation water tank, and a water storage space at the lower part of the heat-preservation water tank can be utilized. The hot water machine provided by the invention can meet requirements of hot water use for modern families: less hot water use requirements of a kitchen, washing and the like can be met at any time, the requirement on a great amount of hot water use for bath in morning or evening can be met, the solar utilization ratio is high, and the energy-saving effect is good.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a heat pump assisted indirect solar water heater. 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 au...

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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