Method for Producing Hot Water Utilizing Combined Heat Resources of Solar Energy and Heat Pump in the Manner of Heating Water at Multilpe Stages and Accumulating Energy and a Device Especially for Carrying Out the Method

Abstract

A method for producing hot water and a device especially for carrying out the method are provided. The method utilizes combined heat resources of solar energy and heat pump in the manner of heating water at multiple stages and accumulating energy. The device comprises solar energy collector, heat pump, electrical heater, water tank, and control unit. The device also includes water-heating tanks with multiple stages. A heating means with multiple stages at different temperatures is formed either by the solar energy collector or by the collector and the heat pump. The outputting end of the two or more heating stages constituted by the solar energy collector or by the collector and the heat pump is connected through ducts to the corresponding water-heating tanks. A predetermined amount of produced water heated at multiple stages is respectively stored in the water-heating tanks. Compared with the prior art, the present invention is endowed with the performance of making use of the solar energy to the greatest extent and utilizing off-peak electricity more efficiently as a supplementary heating means. Furthermore, the arranging fee of the device is reduced and its adaptation of mounting is improved.

1 . A method for producing hot water utilizing combined heat resources of a solar energy and a heat pump in a manner of heating water at multiple stages and accumulating energy, comprising a process of heating with solar energy collectors, a process of heating with the heat pumps, and a process of heating with an electrical heater, wherein a process of producing hot water is a combination of heating the water in a circulating water-heating tank for the collector of multi-stage heating and in conflux hot water tank of multi-stage heating at multiple stages by the solar energy collector, the heat pump, or the electrical heater simultaneously or respectively; production and consumption of the hot water is of a timesharing mode, i.e., a certain amount of hot water produced in advance by heating periodically at multiple stages is stored in the conflux hot water tank of multi-stage heating and an energy accumulation water tank for being supplied for a next period. 
   
   
       2 . The method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 1 , wherein said combination of heating the water in the circulating water-heating tank for the collector of multi-stage heating and in the conflux hot water tank of multi-stage heating at multiple stages with the solar energy collector, the heat pump, or the electrical heater simultaneously or respectively includes: completely utilizing the solar energy collector for heating and storing the hot water in sunny days; using the heat pump or the electrical heater for complementary heating and storing the hot water at night when an off-peak electricity is available; and using the heat pump for instant heating and storing the hot water according to a required certain amount of hot water storage volume when it is not sunny day and the off-peak electricity is not available as well. 
   
   
       3 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy, comprising at least one solar energy collector, a water pump, at least one heat pump, at least one electrical heater, at least one water tank, and a control unit, wherein said water tanks comprises a circulating water-heating tank for the collector, a conflux hot water tank of multi-stage heating, and a energy accumulation water tank, wherein the solar energy collector is connected to the circulating water-heating tank for the collector, the circulating water-heating tank for the collector is connected to the conflux hot water tank of multi-stage heating, and the conflux hot water tank of multi-stage heating is connected to the energy accumulation water tank; the heat pump and the electrical heater are arranged with the water tanks; a start control of the solar energy collector, the water pump, and the heat pump, and the electrical heater are electrically connected to the control unit respectively. 
   
   
       4 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein said energy accumulation water tank has more than one water tanks, including a warm water storage tank of multi-stage heating and a final temperature water storage tank; the conflux hot water tank of multi-stage heating, the warm water storage tank of multi-stage heating, and the final temperature water storage tank are connected in parallel. 
   
   
       5 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein said circulating water-heating tank for the collector has one or more water tanks, and the last one of the interconnected one or more circulating water-heating tanks for the collector also functions as a conflux hot water tank of multi-stage heating. 
   
   
       6 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein when the heat pump and the electrical heater are arranged with the water tanks, the heat pump or the electrical heater is disposed on and outside the water tanks of multi-stage heating. 
   
   
       7 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein said heat pump comprises one or more heat pumps disposed on the conflux hot water tank of multi-stage heating and the final temperature water storage tank and disposed there-between, so as to form heat pumps for heating at multiple stages, and the heat pumps for heating at multiple stages are directly or indirectly connected in series. 
   
   
       8 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein said warm water storage tank of multi-stage heating and the final temperature water storage tank are further connected to bypass pipelines in parallel, and the bypass pipelines have one-way valves for supplying water or heating water from the warm water storage tank of multi-stage heating to the final temperature water storage tank. 
   
   
       9 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3  or  4 , wherein electric control valves are disposed on water pipes connected in parallel between the conflux hot water tank of multi-stage heating, the warm water storage tank of multi-stage heating, and the final temperature water storage tank. 
   
   
       10 . A device especially for carrying out a method for producing hot water utilizing combined heat resources of solar energy and heat pump in a manner of heating water at multiple stages and accumulating energy as claimed in  claim 3 , wherein a connecting pipe for discharging water is disposed on the warm water storage tank of multi-stage heating and the final temperature water storage tank, and a hot water booster pump is additionally disposed on the connecting pipe for discharging water.