Heat pump water heating machine and operation control method thereof

Abstract

The invention relates to a heat pump water heater which comprises a heat preservation water tank, a heat pump water heater mainframe, a condenser and a control circuit for coordinating normal operation of each part. A cold water intake and a hot water outlet are arranged on the heat preservation water tank, the condenser is positioned in the heat preservation water tank, the heat pump water heater mainframe is positioned in the exterior of the heat preservation water tank, and a refrigerant circulating tube is arranged between the condenser and the heat pump water heater mainframe. The heat pump water heater disuses a water system engineering material arranged in the heat pump water heater, such as a water pump, a water pipe, a penstock and the like, therefore installation fees of the heat pump water heater is cut down to a large degree and even canceled; material consumption quantity of the condenser required by the heat pump water heater is reduced significantly, and the manufacturing cost of the condenser and the whole equipment is decreased; via reasonable design and control, problems like hot water supply, hot water circulation return, and water reheating of the heat preservation water tank are completely solved, which ensures simple hot water engineering and low manufacturing cost of the system; meanwhile, due to simple engineering and less motional parts, equipment failure rate is decreased to a large degree.

Description

technical field [0001] The invention relates to a heat pump water heater and an operation control method thereof. Background technique [0002] Heat pump water heaters for engineering are classified according to heating methods. Currently, there are one-time heating type and circulating heating type. [0003] One-time heating heat pump water heater, the water heater itself is equipped with a condenser, and the cold water is heated to the set termination temperature once it flows through the heat pump water heater, which has the following disadvantages. (1) The installation of this equipment generally requires water distribution pipes, water pumps and complex cold water control systems, and the installation cost is high. (2) When the equipment is heating hot water in winter, the design of the defrosting system is complicated and difficult to defrost. (3) In projects such as hotels, the hot water system needs to be equipped with hot water circulating return water to ensure t...

AI Technical Summary

Problems solved by technology

(1) The installation of this equipment generally requires water distribution pipes, water pumps and complex cold water control systems, and the installation cost is high

(2) When the equipment is heating hot water in winter, the design of the defrosting system is complex and difficult to defrost

(3) In projects such as hotels, the hot water system needs to be equipped with hot water circulating return water to ensure that there is always hot water in the hot water pipe network, but because the return water temperature is much higher than the cold water temperature, due to the existence of return water It leads to frequent and large fluctuations in the operating conditions of the equipment, which affects the service life of the equipment and the backwater control is complicated and difficult

(4) Hot water is stored in the large thermal insulation tank. When it is not used for a long time, the temperature of the water in the large thermal insulation tank will drop. At this time, the water in the large thermal insulation tank needs to be reheated. The reheating system is complex and consumes a lot of materials. , high cost

(5) The condenser equipped with the equipment itself has a plate heat exchanger, a shell-and-tube heat exchanger or a casing heat exchanger, and the cost of these heat exchangers is relatively high

(1) The installation of this equipment must be equipped with circulating water pipes and water pumps, etc., and the installation cost is high

(2) Since the circulation of the water pump will cause the water in the water tank to be fully mixed, the working mode of the single water tank of the equipment is only suitable for supplying hot water in one time period per day; To make full use of the characteristic that the lower the hot water temperature is, the higher the heat pump heating energy efficiency ratio, the working method of large and small water tanks must be adopted, that is, the water is first heated to the set temperature in the small insulated water tank, and then stored in the large insulated water tank. Add cold water to the heat preservation water tank for reheating, which prevents the heat pump from working under the condition of high hot water temperature and low heating energy efficiency ratio, but at the same time leads to complex water pipeline system, complicated control and high engineering cost

(3) The working mode of large and small water tanks. When the water is not used for a long time, the water temperature in the large thermal insulation water tank will drop. At this time, the water in the large thermal insulation water tank needs to be reheated. The reheating system and control are complex and consume a lot of materials. , high cost

(4) The condenser equipped with the equipment itself has a plate heat exchanger, a shell-and-tube heat exchanger or a casing heat exchanger, and the cost of these heat exchangers is relatively high

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