Split type heat-pump water heater and water supply control method thereof

Abstract

The invention discloses a split type heat-pump water heater and a water supply control method thereof. The split type heat-pump water heater comprises a heat-pump main engine and a water tank, a condenser is arranged in the water tank, the heat-pump main engine is connected with the condenser through a connection pipe and provided with a controller, the lower portion of the water tank is provided with a cold water inlet, a temperature sensor and a hot water outlet, the temperature sensor is located above the cold water inlet, and the hot water outlet is located above the temperature sensor. The water temperature T in the water tank is obtained and compared with a shutting-down temperature T0 and a starting-up temperature equal to the difference value between T0 and delta T0 of the heat-pump main engine, wherein the delta T0 is smaller than T0, and delta T0 is the starting-up and shutting-down temperature difference value of the heat-pump main engine, so that the heat-pump main engine is shut down when T is greater than or equal to T0, and the heat-pump main engine is started when T is less than or equal to the difference value between T0 and delta T0. According to the split type heat-pump water heater and the water supply control method thereof, hot water supply is increased effectively, and the equipment failure rate is reduced.

Description

technical field [0001] The invention relates to a heat pump water heater and a control method thereof. Background technique [0002] The split type heat pump uses the characteristics that the density of water changes with temperature (the density of water becomes smaller when the temperature rises, and the density of water becomes larger when the temperature drops) to heat the cold water through natural convection heat exchange. Existing split-type heat pump water heaters generally include a heat pump main unit and a water tank. A water outlet is provided at the upper part of the water tank, and a cold water inlet is provided at the lower part, and a hose and a floating ball are arranged in the water tank. When using water, cold water enters from the lower part of the water tank, and hot water flows out from the upper part of the water tank. [0003] In order to reduce the cost, the supporting water tank of the general engineering split heat pump is non-pressurized, and the...

AI Technical Summary

Problems solved by technology

[0005] 1. As the water level in the water tank will continue to rise and fall, the float and hose in the water tank will keep moving up and down, resulting in the possibility of hose failure

[0006] 2. The hot water supply is limited to the capacity of the heat preservation water tank

[0007] Because the thermal insulation water tank is generally relatively large, in the process of daily water use, as much hot water is used and as much cold water is added at the same time. The heat pump equipment cannot heat the supplemented cold water in time, that is, the hot water supply is limited to the capacity of the thermal insulation water tank. Unable to increase hot water supply during the process

[0008] 3. Multi-tank parallel water supply control is complex, high cost, and high failure rate

[0009] When multiple water tanks are connected in parallel, due to the inconsistent water supply resistance of each water tank, the hot water in some water tanks is given priority to be supplied, and at the same time, because the cold water replenishment is only controlled by the liquid level, the water tanks that are given priority to be supplied with hot water are filled with cold water. When cold water is supplied to the hot water system, it is necessary to add a hot water supply temperature controller, and add a hot water supply solenoid valve and a hot water supply check valve to the hot water supply pipeline of the water tank, which leads to the parallel water supply control of multiple water tanks. Complex, high cost, high failure rate

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