42results about How to "Lower water supply temperature" patented technology

The invention relates to an energy-saving control method for a self-adaptation frequency-conversion heat pump hot water heating system. The energy-saving control method is characterized by comprising the steps that a basic functional expression among a heat pump water supply calculating temperature, an indoor set temperature and an outdoor environment temperature is established, and the temperature difference between the heat pump water supply calculating temperature and an actual water return temperature is judged so that the heat pump water supply calculating temperature can be corrected; the heat pump water supply calculating temperature is corrected again on the basis of a first corrected functional expression according to the deviation between a stabilized actual room air temperature and a set indoor temperature; and the rotating speed of a compressor of a frequency-conversion heat pump water heater is adjusted according to the difference value between an actual water supply temperature and the heat pump water supply calculating temperature obtained through a second corrected functional expression, and therefore an actual water supply calculating temperature and the heat pump water supply calculating temperature tend to be consistent. The energy-saving control method has the beneficial effects that the heat preservation characteristics of different buildings and the differences of laying of hot water coils are taken into full consideration, the water supply calculating temperature is more accurate, and the energy-saving effect is also more obvious.

The present invention relates to a solar composite energy system based on solid adsorption refrigerating machine in the energy-saving field. Said system includes solar collection system, solar hot water supply system, solar floor heating system, solar air-conditioning system, solar natural ventilation system and control system.

The invention relates to a novel low-temperature combined cooling, heating and power (CCHP) system based on a heat pump. Currently, no novel low-temperature CCHP system based on the heat pump with a simple structure and a reasonable design exists. The novel low-temperature CCHP system based on the heat pump comprises a high-pressure steam pipe, a steam turbine, a power generator, a condenser and a boiler connecting pipe, and is characterized by also consisting of a heating low-pressure steam pipe, a heating condensate pipe, a power plant after-heat single-effect heat pump unit, a refrigeration single-effect absorbing heat pump unit, a heat pump unit loop pipe, a loop circulating pump, a user refrigeration pipe, a cooling tower, a cooling tower water inlet pipe, a cooling tower water outlet pipe, a cooling water circulating pump, a power plant circulating cooling water pipe, a heat pump cooling tower, a cooling tower circulating pipe, a heating single-effect absorbing heat pump unit, a heating heating pipe, a heat pump circulating pipe and a user heating pipe; the heating low-pressure steam pipe is connected with the refrigeration single-effect absorbing heat pump unit; and the heating condensate pipe is connected with the power plant after-heat single-effect heat pump unit. The novel low-temperature CCHP system based on the heat pump has the advantages of reasonable structural design, energy saving, environmental friendliness and high heat utilization rate.

The invention belongs to the technical field of thermoelectricity, and relates to a 300MW-capacity-level low vacuum heat supply steam turbine system and an adjusting method thereof. The system consists of a 300MW-capacity-level low vacuum heat supply steam turbine generator set and a power plant cold end and heat supply load coupling adjusting system. A steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder I, a steam turbine low-pressure cylinder II and a generator are uniaxially arranged in the steam turbine generator set. In the heating period, the back pressure of the two low-pressure cylinders rises, and a steam turbine set runs under low vacuum; steam is uniformly divided into two strands when entering a communicating pipe at the front of the two low-pressure cylinders, so that the flow of each low-pressure cylinder is half the flow of the low-pressure cylinder of the 300MW-capacity-level steam turbine in the prior art, and the flow is greatly reduced; the length of the last-stage blade is shortened, the adjusting range of back pressure is expanded, and the safety of the system is improved; and in the non-heating period, the steam turbine set runs under the straight condensing condition. The invention is applicable for a 300MW-capacity-level combined heat and power steam turbine set to implement low vacuum heat supply.

The invention discloses an air-conditioner control method and device. The air-conditioner control method includes steps of detecting a first temperature difference between a first water supply temperature and a first water return temperature of the air conditioning unit; judging whether a first difference between the first temperature difference and a preset temperature is larger than a first preset threshold or not; if the first difference is larger than the first preset threshold, adjusting frequency of a freezing water pump in the air conditioning unit, so that a second difference between a second temperature difference between a second water supply temperature and a second water return temperature of the air conditioning unit and the preset temperature is smaller than or equal to the first preset threshold under the adjusted frequency of the freezing water pump. The air-conditioner control method solves the technical problem of instable system load caused by variable water temperature or flow control of the air conditioners in the prior art and has the technical advantages that system load stability is maintained, refrigeration and moisturizing of the tail end of the air conditions are guaranteed and system energy consumption is lowered.

The invention discloses a method for determining a dynamic change rule of dew point temperature of an attached layer of a radiant ceiling. The method comprises the following specific steps of: firstly, determining influence factors of the dynamic change rule of the dew point temperature of the attached layer; and secondly, performing simulation by utilizing ANSYSY software to obtain sample data, and then based on SAS software, obtaining the dynamic change rule of the dew point temperature of the attached layer with a multivariate regression analysis method: y=12.78891+0.31639xb+0.19712xc-0.12698xd, wherein y is the dew point temperature of the attached layer, b is wet dissipation strength, c is a relative distance between a fresh air inlet and a test point of the attached layer, and d is a relative distance between a wet source and the test point of the attached layer. According to the method, an indoor wet diffusion model is constructed, an interaction relationship among a water supply parameter of a radiant plate, an indoor thermal and humid environment parameter and the dew point temperature of the attached layer is deeply researched, and the dynamic change rule of the dew point temperature of the attached layer is proposed with a statistic analysis method.

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.

The invention relates to an energy-saving control method for a floor radiant heating system comprising a variable-frequency heat-pump water heater. The energy-saving control method is characterized by comprising steps as follows: a functional expression of a water supply calculating temperature Tgj of a floor and an outdoor environment temperature Tw is established by a control system through calculation according to performance of the variable-frequency heat-pump water heater and heat load characteristics of a heating room; a functional expression of a room calculating air temperature Tnj based on a thermal comfort degree of a human body and the outdoor environment temperature Tw is established by the control system; a rotating speed of a compressor of the variable-frequency heat-pump water heater is adjusted by the control system according to the difference value of a water supply actual temperature Tgs and the water supply calculating temperature Tgj, and the water supply actual calculating temperature Tgs and the water supply calculating temperature Tgj are enabled to be consistent; the opening degree of a tee proportion regulating valve is adjusted by the control system according to the difference value of a room actual air temperature Tns and a room calculating air temperature Tnj, and the room actual air temperature Tns and the room calculating air temperature Tnj are enabled to be consistent. The energy-saving control method has the advantages that the energy efficiency of the heat-pump water heater is higher, energy-saving operation is realized, the comfort degree of the human body is better and the like.

The invention discloses a cross type dew point evaporative cooling high-temperature water chilling unit. The cross type dew point evaporative cooling high-temperature water chilling unit comprises a unit shell body. An air inlet a and an air inlet b are formed in the two opposite side walls of the unit shell body correspondingly. A direct evaporative cooling element is arranged in the center in the unit shell body. A surface cooler a and a cross type dew point evaporative cooling element A are sequentially arranged between the air inlet a and the direct evaporative cooling element. A surface cooler b and a cross type dew point evaporative cooling element B are sequentially arranged between the air inlet b and the direct evaporative cooling element. An air outlet is formed in the position, corresponding to the top wall of the unit shell body, of the upper portion of the direct evaporative cooling element. According to the cross type dew point evaporative cooling high-temperature water chilling unit, not only can stable high-temperature chilled water be produced, but also the heat exchange efficiency can be effectively improved.

The invention discloses a large temperature difference centralized heating system using power plant waste heat and a work method. A two-stage water-water heat exchanger and a two-stage power drive heat pump unit are arranged in a two-stage net heat exchange station, a circular cooling water waste heat recycling heat exchanger, a circular cooling water waste heat recycling electric heat pump unit,steam-water heat exchanger and a water-water heat exchanger are arranged in a first-stage pipe network heat exchange station, on the premise of ensuring the secondary network normal water supply temperature, water supply temperature of a primary heat network can be greatly reduced, steam consumption of a heat supply system is greatly reduced, and the use proportion of thermal power plant circularwater waste heat is greatly improved. Meanwhile, it is ensured that a secondary pipe network has the normal water supply temperature and water supply and returning temperature difference, the water supply temperature of the primary heat network is reduced to 80 DEG C, the water supply temperature of a secondary pipe network reaches about 70 DEG C, and the normal running flow of the secondary pipenetwork and energy-saving running of the circular water pump are ensured.

The invention provides a control method of an air source heat pump unit system and the air source heat pump unit system. The control method comprises the steps that the temperature of a room is set to be T, and the temperature deviation value is set to be delta T1; the water supply temperature of the air source heat pump unit system is set to be T1, and the water return temperature of the air source heat pump unit system is set to be T2; whether the current temperature deviation value of the room is higher than a set temperature deviation value delta T1 or not is judged; and when the current temperature deviation value of the room is higher than the set temperature deviation value delta T1, the set water supply temperature T1 is reduced, and meanwhile it is ensured that delta T is not changed. Based on the technical scheme, by adjusting the operation state of the air source heat pump unit system, the actual water supply temperature of the air source heat pump unit system is reduced, the temperature difference between supply water and return water of the air source heat pump unit system is kept unchanged, in this way, the operation energy consumption of the air source heat pump unit system is reduced, and therefore the operation efficiency of the system is improved; and therefore, the comfort of the room is improved, and better experience is brought to the user.

The invention relates to a fin type pulsating heat pipe phase change energy storage integrated module and application. The fin type pulsating heat pipe phase change energy storage integrated module comprises a steel plate box which is formed by stainless steel plates, the lower layer of the steel plate box is paved with a polyurethane insulation layer, a plurality of sets of pulsating heat pipes are arranged in the steel plate box, fins for enhanced heat transfer are fully distributed on the pulsating heat pipes, the steel plate box is filled with a phase change energy storage material, and the upper end of the steel plate box is sealed with an aluminum plate. According to the fin type pulsating heat pipe phase change energy storage integrated module and application, the thermal inertia ofa radiator arranged at the tail end is perfected, the water supply temperature required by a heating system is reduced, efficient and multiple utilization of energy sources in building heat supply isachieved, and the problem that at present, the environment is polluted by country fire coal heating in cold regions is solved.

The invention relates to an energy-saving control method of a frequency-fixed heat pump water heater floor radiant heating system. The method is characterized by including the energy-saving control steps of calculating the functional expression between the water supply calculation temperature Tgj of a floor and the outdoor environment temperature Tw through a control system according to the performance of a frequency-fixed heat pump water heater and thermal load characteristics of a heating room, establishing the functional expression between the room calculation air temperature Tnj based on the human body thermal comfort degree and the outdoor environment temperature Tw through the control system, and making the water supply calculation temperature Tgj+/-1 DEG C serve as the start and stop control temperature of the frequency-fixed heat pump water heater through the control system. The method has the advantages that the energy efficiency of the heat pump water heater is high, and energy-saving running and the higher human body comfort degree are achieved.

A heat recovery and sustained release device used for a heat supply system includes a heat source side system (1) and an end system (2), and also includes an energy storage module (3) and an internalcirculation pump (4); and through adoption of an energy storage technology, when a load of the end system produces a sudden change from large to small, heat is quickly extracted and stored from the end system and is used for eliminating thermal inertia of the heat supply system.

The invention discloses a water mixing device of a water distributing and collecting device. The water mixing device is characterized in that an electric three-way regulating valve, a circulating water pump and a water temperature sensor are arranged on a water supply pipeline where a cooling and heating water inlet pipe is connected with a water distributor, a three-way pipe and an electric stop valve are arranged on a water return pipeline where a water collector is connected with a cooling and heating water outlet pipe, and the three-way pipe is combined with a water return branch pipe for connecting return water on the water return pipeline into the electric three-way regulating valve; and the water mixing device further comprises an indoor dew point temperature probe, an indoor temperature sensor, a temperature control panel, an electric three-way regulating valve, a circulating water pump, a water temperature sensor and an electric stop valve, wherein the indoor dew point temperature probe and the indoor temperature sensor are electrically connected with the temperature control panel. Meanwhile, the invention further discloses a control method of the water mixing device. The water mixing device is simple in structure and stable in operation, the water mixing device is arranged at the radiation tail end of a fresh air conditioning system and can be directly connected into a conventional air conditioning water system, condensation caused by too low water supply temperature in summer can be avoided, and the situation that the service life of components and radiant tubes is affected by too high water supply temperature in winter can be prevented.