A reservation control method for a direct expansion solar energy heat pump water heater and a direct expansion solar energy heat pump water heater

Abstract

The invention discloses a reservation control method for a direct expansion solar energy heat pump water heater and a direct expansion solar energy heat pump water heater. The method includes the following steps : the preset temperature Ts is set by users, the time required for hot water is set as the preset time t1, and the current temperature of a water tank is Tr; the amount of heating Q required for increasing the water temperature to the preset temperature is calculated; the heat pump heating power P is calculated; the heating time is delta t; t1-t2 and delta t is compared; if t1-t2 <= delta t, the heat pump is started at the current time t2, and if t1-t2 > delta t, the heat pump is started at t3. Based on the difference of the climate in various regions, the solar energy irradiationstrength and the environmental temperature, and the water temperature and time set by users, the starting time of the direct expansion solar energy heat pump water heater can be automatically determined and the water heating can be completed in advance; the illumination strength is introduced by the water heater through a photosensitive sensor, so that the solar energy radiation heat quantity canbe utilized better, and the parameters of the direct expansion solar energy heat pump water heater can be adjusted.

Description

technical field [0001] The invention belongs to the field of water heaters, and in particular relates to a direct expansion solar heat pump water heater reservation control method and the water heater. Background technique [0002] Solar heat pump water heaters use direct expansion evaporators to absorb both solar radiant heat and air heat. For this method of organically combining solar energy and air energy technologies to make hot water, due to the complex and changeable external environment, simple It is difficult to complete the heating in advance by using the heating rate to complete the scheduled start time, and it is difficult to achieve the purpose of saving energy due to the influence of solar radiation and ambient temperature. [0003] There are two main control methods for existing air source heat pump water heaters. The first one is to calculate the required heating time based on the heating power of the system and the heat to be heated according to the user’s re...

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Problems solved by technology

[0006] The existing reservation control method only considers the heating power of the system and the ambient temperature, which can meet the reservation heating application of ordinary air source heat pump water heaters, but the heating efficiency of direct expansion solar heat pump water heaters or similar systems is greatly affected by the intensity of solar radiation. The heating power is related to the ambient temperature and solar radiation intensity. If it is impossible to distinguish between day and night, it is difficult to satisfy the system performance when the system is reserved for heating. In addition, the heating power of the heat pump system is greatly affected by the ambient temperature. The heating power of the system is different, and the calculation of the scheduled heating time is based on the constant heating power, which will lead to inaccurate start-up of the solar heat pump water heater and no energy saving

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