40results about How to "Lower the inlet water temperature" patented technology

The invention provides a cooling system and method of an internal combustion engine, in particular to a cooling system and method of a marine diesel engine. Double heat exchangers are adopted and arranged in a high temperature branch and a low temperature branch correspondingly, internal cooling liquid are divided into a first internal cooling liquid branch and a second internal cooling liquid branch after being heated by an engine body, and the first internal cooling liquid branch comprises a first thermostat, the vice heat exchanger and a high temperature stage intercooler; the second internal cooling liquid branch comprises a second thermostat, the main heat exchanger and a lower temperature stage intercooler; and internal cooling liquid passing through the first internal cooling liquid branch and the second internal cooling liquid branch are converged and then returns to the engine body to form a closed cooling loop. According to the cooling system, size requirement of a whole engine is met, cooling system cost is lowered, the reliability of the cooling system is improved, and the combustion condition of the engine is improved.

The invention discloses a transcritical CO based on a precooler 2 The heat pump system and the waterway two-way valve control method, the conventional transcritical CO 2 The heat pump system is assisted by a pre-cooler system; the circulating water circuit is divided into two parts in the system through the three-way water diversion valve and the three-way water collection valve, and connected by the two-way water channel regulating valve and the water channel bypass valve; The ambient temperature sensor, evaporator fin temperature sensor and evaporation pressure sensor are used, and the programmable logic controller is used as the core of acquisition, calculation and control. Through the above system configuration and a well-developed joint control method of temperature, pressure and time, transcritical CO 2 The promotion of heat pump systems to the heating field can make up for the impact of high return water temperature on transcritical CO 2 System performance degradation, proper control of units entering and exiting defrost, and addressing transcritical CO 2 The heat pump system stops heating during a relatively long defrosting time, and the average temperature of the circulating water system drops rapidly.

The invention discloses a hierarchical heating type domestic hot water storage and supply system and a control method of the hierarchical heating type domestic hot water storage and supply system. The hierarchical heating type domestic hot water storage and supply system comprises a hierarchical heating type water storage system used for storing heated water in a hierarchical mode according to water temperature, a water replenishing system, a hot water heating system, a hot water supplying system used for outputting the hot water in the hierarchical heating type water storage system, and an automatic control system, wherein the water replenishing system, the hot water heating system, the hot water supplying system and the automatic control system are connected with the hierarchical heating type water storage system. According to the hierarchical heating type domestic hot water storage and supply system and the control method of the hierarchical heating type domestic hot water storage and supply system, the hierarchical heating type domestic hot water storage and supply method and the intelligent control method are adopted, hot water and cold water are layered naturally according to the temperature gradient, gradient utilization of energy resources is facilitated, the inlet water temperature of a heat pump water heater is low, the condensation temperature of the system is lowered, the energy efficiency ratio is high, and energy resources are saved; the hierarchical heating type domestic hot water storage and supply system is reasonable in design, efficient, capable of saving energy, high in water temperature control precision, stable in outlet water temperature, high in use comfort, and capable of reducing environment pollution.

The invention discloses a method of obtaining low-approach cooling water by utilizing a cooling tower. A bypass branch passage with a flow regulating valve is connected with a circulating cooling water passage of a condenser of a refrigerating unit in parallel, water from the cooling tower is pressurized by a cooling circulating pump and then is divided into two paths, the water in one path flows through the branch passage of the condenser of the refrigerating unit, and the water in the other path flows through the bypass branch passage. The cooling water from the condenser of the refrigerating unit and the cooling water from of the bypass branch passage are mixed and then enter the cooling tower for circulating cooling. A flow G1 flowing through the branch passage of the refrigerating unit is required to be determined according to a designed cooling load of a refrigerating system, a flow G2 of the bypass branch passage is determined through calculation according to an approach required by circulating cooling water, and the flow of the cooling tower is determined according to the flow G1 of the branch passage of the refrigerating unit and the flow G2 of the bypass branch passage. Through technological improvement, the method obtains the low-approach cooling water by utilizing the cooling tower, and safe operation of the refrigerating system is not affected.