CN-116857848-B - Multi-mode organic Rankine compression type refrigeration cycle system based on solar energy utilization

CN116857848BCN 116857848 BCN116857848 BCN 116857848BCN-116857848-B

Abstract

The invention discloses a solar energy utilization-based multi-mode organic Rankine compression refrigeration cycle system, which comprises a high-pressure evaporator, an expander, a second clutch, a condenser, a working medium pump, a low-pressure evaporator, a four-way reversing valve, a compressor, a first clutch, a generator, a solar heat collector, a water tank module and a water pump module, wherein the high-pressure evaporator, the expander, the condenser and the working medium pump are sequentially connected to form an organic Rankine cycle subsystem, the compressor, the condenser and the low-pressure evaporator are sequentially connected to form a vapor compression refrigeration subsystem, and the solar heat collector, the water tank module and the water pump module are sequentially connected to form the solar heat collection cycle system. Based on the positive and reverse coupling system driven by solar energy, the Rankine cycle and the compression refrigeration cycle are combined, and the four-way valve is added and combined with the solar energy and the heat storage water tank, so that the system has adjustability, saves investment cost, improves energy utilization rate, and meets the comprehensive requirements of users on cold, heat and electricity.

Inventors

WU ZIYING
WU JINTAO
LIANG YOUCAI
ZHU YAN
LIU XINYU

Assignees

华南理工大学

Dates

Publication Date: 20260505
Application Date: 20230621

Claims (3)

1. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization is characterized by comprising a high-pressure evaporator, an expander, a second clutch, a condenser, a working medium pump, a low-pressure evaporator, a four-way reversing valve, a compressor, a first clutch, a generator, a solar heat collector, a water tank module and a water pump module; The four-way reversing valve is provided with a first channel and a second channel, and the water tank module is provided with an upper inlet, an upper outlet, a lower inlet and a lower outlet; The outlet of the high-pressure evaporator is provided with a first branch and a second branch, a third electromagnetic valve is arranged on the first branch, the first branch is connected with the inlet of the condenser through the second channel, a fourth electromagnetic valve is arranged on the second branch, the second branch is connected with the inlet of the expander, the outlet of the expander is connected with the inlet of the condenser through the second channel, the outlet of the condenser is divided into a third branch and a fourth branch after being provided with a first throttle valve and a first electromagnetic valve which are arranged in parallel, the third branch is connected with the inlet of the working medium pump, and the outlet of the working medium pump is connected with the inlet of the high-pressure evaporator to form an organic Rankine cycle subsystem; The outlet of the compressor is connected with the inlet of the condenser through the second channel, the fourth branch is provided with a second throttle valve and a second electromagnetic valve which are arranged in parallel and then connected with the inlet of the low-pressure evaporator, and the outlet of the low-pressure evaporator is connected with the inlet of the compressor through the first channel to form a vapor compression refrigeration subsystem; The outlet of the solar heat collector is connected with the upper inlet through a fifth electromagnetic valve, the upper outlet is connected with the inlet of the high-pressure evaporator through the water pump module, the outlet of the high-pressure evaporator is connected with the lower inlet through a sixth electromagnetic valve, and the lower outlet is connected with the inlet of the solar heat collector to form a solar heat collection circulation system; the water tank modules are three-level water tanks, and an upper inlet of each water tank, an upper outlet of each water tank, a lower inlet of each water tank and a lower outlet of each water tank are respectively connected in parallel; The fifth electromagnetic valve and the sixth electromagnetic valve are respectively opened to enable the three stages of the water tank module to be opened, the first clutch is closed, the second clutch is opened, the first throttle valve, the second electromagnetic valve and the fourth electromagnetic valve are opened, the first electromagnetic valve, the second throttle valve and the third electromagnetic valve are closed, so that kinetic energy generated by the expander is used for generating electricity, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters a power generation mode; the fifth electromagnetic valve and the sixth electromagnetic valve are respectively opened to enable the three stages of the water tank module to be opened, the first clutch is opened, the second clutch is closed, the first throttle valve, the second electromagnetic valve and the fourth electromagnetic valve are opened, the first electromagnetic valve, the second throttle valve and the third electromagnetic valve are closed, so that kinetic energy generated by the expander is used for driving the compressor to refrigerate, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters a refrigeration mode; The fifth electromagnetic valve and the sixth electromagnetic valve in part of the water tank are opened to enable the water tank module to be opened for one stage or two stages, the four-way reversing valve is reversed, the first clutch is closed, the second clutch is opened, the first throttle valve, the second electromagnetic valve and the fourth electromagnetic valve are closed, the first electromagnetic valve, the second throttle valve and the third electromagnetic valve are opened to enable the compressor to be electrically driven to apply work, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters a heating mode; the solar heat collector also comprises a temperature controller, wherein the temperature controller is used for monitoring the temperature of the solar heat collector; When the temperature monitored by the temperature controller is above 125 ℃, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters a refrigeration mode or a power generation mode; And when the temperature monitored by the temperature controller is above 80 ℃, the multi-mode organic Rankine compression type refrigeration cycle system based on solar energy utilization enters a heating mode.
2. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization as set forth in claim 1, wherein each of the fifth solenoid valve and each of the sixth solenoid valve are closed to completely close three stages of the water tank module, the first clutch is opened, the second clutch is opened, the fourth solenoid valve is closed, and the third solenoid valve is opened to circularly operate the vapor compression refrigeration subsystem in the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization.
3. A multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization according to claim 1 to 2, wherein the expander is coaxially connected with the compressor.

Description

Multi-mode organic Rankine compression type refrigeration cycle system based on solar energy utilization Technical Field The invention relates to the technical field of solar refrigeration, in particular to a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization. Background Improving the comprehensive utilization rate of energy and developing an advanced energy conversion system become an important way for constructing a clean low-carbon energy system and realizing a double-carbon target. How to improve the utilization efficiency of energy is a key problem for achieving the dual carbon target. The use of solar thermal energy in refrigeration processes has great potential in reducing fossil fuel consumption and alleviating environmental problems. Solar-assisted air conditioning systems are particularly attractive for areas where solar supply and refrigeration demand are simultaneously at a maximum level. The solar-driven forward and reverse coupling system in the related art is insufficient in adjustability, and when factors such as different seasons, temperature and illumination influence heat accumulation, the supply and demand between solar energy and building load can be mismatched. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, which effectively solves the problems of mismatching of supply and demand between solar energy and building load in a solar heating system, and can determine the opening quantity according to the stored heat so as to reduce heat loss, so that the cycle system breaks through a single energy supply mode, has adjustability, improves the energy utilization rate, and meets the comprehensive demands of users on cold, heat and electricity. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization comprises a high-pressure evaporator, an expander, a second clutch, a condenser, a working medium pump, a low-pressure evaporator, a four-way reversing valve, a compressor, a first clutch, a generator, a solar heat collector, a water tank module and a water pump module; The four-way reversing valve is provided with a first channel and a second channel, and the water tank module is provided with an upper inlet, an upper outlet, a lower inlet and a lower outlet; The outlet of the high-pressure evaporator is provided with a first branch and a second branch, a third electromagnetic valve is arranged on the first branch, the first branch is connected with the inlet of the condenser through the second channel, a fourth electromagnetic valve is arranged on the second branch, the second branch is connected with the inlet of the expander, the outlet of the expander is connected with the inlet of the condenser through the second channel, the outlet of the condenser is divided into a third branch and a fourth branch after being provided with a first throttle valve and a first electromagnetic valve which are arranged in parallel, the third branch is connected with the inlet of the working medium pump, and the outlet of the working medium pump is connected with the inlet of the high-pressure evaporator to form an organic Rankine cycle subsystem; The outlet of the compressor is connected with the inlet of the condenser through the second channel, the fourth branch is provided with a second throttle valve and a second electromagnetic valve which are arranged in parallel and then connected with the inlet of the low-pressure evaporator, and the outlet of the low-pressure evaporator is connected with the inlet of the compressor through the first channel to form a vapor compression refrigeration subsystem; the outlet of the solar heat collector is connected with the upper inlet through a fifth electromagnetic valve, the upper outlet is connected with the inlet of the high-pressure evaporator through the water pump module, the outlet of the high-pressure evaporator is connected with the lower inlet through a sixth electromagnetic valve, and the lower outlet is connected with the inlet of the solar heat collector to form a solar heat collection circulating system. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization has the advantages that the Rankine cycle and the compression refrigeration cycle are combined based on a positive and negative coupling system driven by solar energy, a method for acquiring low-temperature cold energy by using a medium-low-temperature heat source is adopted, meanwhile, in order to save investment cost, a four-way valve is added by taking the medium-low-temperature solar energy as a driving heat source and is combined with solar energy and a heat storage water tank, so that the system has adjustability, the energy utilization rate i