Energy conservation control method of constant-temperature water supply fixed-frequency heat pump hot-water heating system

Abstract

The invention relates to an energy conservation control method of a constant-temperature water supply fixed-frequency heat pump hot-water heating system. The energy conservation control method is characterized in that the energy conservation control method of a control system comprises the following steps: a basic function formula among a water supply calculated temperature Tgj of a heat pump, an indoor set temperature Tsd and an outdoor environment temperature Tw is established, a first correction function formula calculated according to the water supply calculated temperature Tgj of the heat pump is established, and a second correction function formula calculated according to the water supply calculated temperature Tgj of the heat pump is established; by controlling the start-stop of a compressor of a fixed-frequency heat pump water heater, a water supply actual temperature Tgs is made to be 0-1 degree higher than the water supply calculated temperature Tgj obtained according to the second correction function formula; and the control system adjusts a water supply to water return proportion of a three-way proportioning valve through a deviation between detected water supply actual temperature Tgs and the water supply calculated temperature Tgj, so as to allow the water supply actual temperature Tgs and the water supply calculated temperature Tgj to tend to be consistent. The energy conservation control method has the advantages that the differences of heat preservation characteristics and hot water coil laying of different buildings is considered fully, automatic judgment and correction are carried out in an operating process, the energy conservation effect is more obvious, the supply water temperature is constant, and the temperature fluctuation of a room is small.

Description

technical field [0001] The invention relates to an energy-saving control method for a constant-temperature water supply and fixed-frequency heat pump hot water heating system. Background technique [0002] As a high-efficiency and energy-saving hot water product, heat pump water heaters are increasingly used in heating systems. At present, whether it is a fixed-frequency or fixed-frequency heat pump water heater floor heating system design, the water supply / return water temperature is generally 45°C / 35°C, and the room air temperature is mostly controlled by the floor surface temperature or room air temperature. The heat pump water heater is turned on and off. Because the energy efficiency of the heat pump water heater decreases with the increase of the water supply temperature, and the outdoor ambient temperature changes greatly within a heating cycle, and the outdoor ambient temperature also varies greatly within a day, therefore, its heating load in different time periods ...

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Problems solved by technology

However, due to the dynamic changes in the outdoor ambient temperature, the thermal insulation performance of different buildings and the laying of heat exchange coils are quite different, and the temperature perception of different groups of people is different, how to use a simple method to determine the optimal heat pump water supply temperature is to achieve heat pump operation The key to energy saving

At the same time, since the fixed-frequency heat pump adopts on-off control to control the water supply temperature, the water supply temperature fluctuates greatly, which has a certain impact on the temperature stability of the heating room. Therefore, it is also necessary to consider how to realize the stability of the water supply temperature in the system.

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