An energy-saving additive for HVAC systems using water as the heat transfer medium and its application.

Abstract

The present invention discloses an energy-saving additive for a HVAC system using water as a heat carrier, comprising the following components by weight: 1-10 parts of sulfate compounds, 1-5 parts of alkyl glucoside, 0.1-5 parts of polydimethylsiloxane emulsion, 0.1-5 parts of polyethylene glycol, 0.1-5 parts of ethoxylate, 0.01-0.1 parts of antioxidant, and 90-130 parts of deionized water. The energy-saving additive is added to water at a ratio of 0.5%-3% of the mass of circulating water in the HVAC system, which can reduce the surface tension of water, make water more easily contact with the heat exchange surface, help to reduce the laminar flow effect of the fluid, promote the formation of turbulence, thereby increasing the effective area of ​​heat transfer and improving the overall heat exchange efficiency. The preparation method of the energy-saving additive is simple, and it can be directly added to the existing system circulating water during use. The energy-saving technology is compatible with various types of systems.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving additives, in particular to an energy-saving additive for a HVAC system using water as a heat carrier and an application thereof. Background Art

[0002] The most commonly used heat transfer medium in HVAC systems such as air conditioners and boilers is water. The advantages of using water as a heat transfer medium are low cost, good safety, and good heat transfer effect. The disadvantage is that because water has a large surface tension, it will produce a gap similar to an air layer, reducing the effective area of ​​heat transfer and forming a large thermal resistance, which in turn reduces the heat exchange efficiency. In addition, water as a heat carrier is very easy to form laminar flow during the flow process, which reduces the internal mixing effect and affects the heat exchange efficiency. These disadvantages lead to efficiency loss in the heat exchange process.

[0003] Chinese patent document CN202111495520.0 discloses a phosphorus-free boiler water energy-saving agent and its preparation method and application, wherein the energy-saving agent raw materials include: 1-5 parts of monohydroxyamine, 6-30 parts of alcohol amine, 1-15 parts of cyclic amine, 8-15 parts of alkali solution, and 50-100 parts of water. Chinese patent document CN201910671691.0 discloses an energy-saving agent for a temperature control system using water as a heat exchange medium and its application, wherein the energy-saving agent includes the following components in parts by weight: 1-40 parts of higher alkanol, 1-20 parts of higher alcohol fatty acid ester, 1-20 parts of polyoxyethylene polyoxypropylene alkyl ether, 1-20 parts of polyoxyethylene polyoxypropylene fatty acid ester, 1-20 parts of glycolipid, 1-20 parts of polyoxyethylene polyoxypropylene siloxane, and 1-20 parts of fluorocarbon polyoxyethylene polyoxypropylene ether. There is no report on the energy-saving additive and application of the present invention. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving additive for a HVAC system using water as a heat carrier and its application in view of the deficiencies in the prior art, and specifically adopt the following technical solutions.

[0005] An energy-saving additive for a HVAC system using water as a heat carrier, comprising the following components in parts by weight: 1-10 parts of a sulfate compound, 1-5 parts of an alkyl glucoside, 0.1-5 parts of a polydimethylsiloxane emulsion, 0.1-5 parts of polyethylene glycol, 0.1-5 parts of an ethoxylate, 0.01-0.1 parts of an antioxidant, and 90-130 parts of deionized water.

[0006] Preferably, the energy-saving additive comprises the following components in parts by weight: 1-5 parts of sulfate compounds, 2-5 parts of alkyl glucoside, 0.5-1 parts of polydimethylsiloxane emulsion, 0.2-0.5 parts of polyethylene glycol, 0.5-1 parts of ethoxylate, 0.01-0.05 parts of antioxidant, and 100 parts of deionized water.

[0007] The sulfate compound is one or more of sodium dodecyl sulfate, sodium lauryl ether sulfate and sodium dodecyl alcohol ether sulfate.

[0008] The alkyl glucoside is one or more of octyl glucoside, decyl glucoside, dodecyl glucoside and coconut glucoside.

[0009] The polyethylene glycol is PEG-200, PEG-400, PEG-600, PEG-800 or PEG-1000.

[0010] The antioxidant is butylated hydroxytoluene.

[0011] The ethoxylate is one or two of fatty alcohol polyoxyethylene ether and fatty acid polyoxyethylene ester.

[0012] A method for preparing the energy-saving additive is to first dissolve the alkyl glucoside in deionized water to form a homogeneous solution, then add a sulfate compound, a polydimethylsiloxane emulsion, polyethylene glycol, an ethoxylate, and an antioxidant, and fully stir each component after adding it to ensure that it is evenly dispersed and completely dissolved, so as to obtain the energy-saving additive. It should be noted that there is no order requirement for adding the sulfate compound, the polydimethylsiloxane emulsion, polyethylene glycol, the ethoxylate, and the antioxidant, and the preparation method is simple.

[0013] In actual application, the energy-saving additive is added to water at a ratio of 0.5%-3% of the mass of circulating water in the HVAC system. Preferably, the usage amount is 1%-2%wt.

[0014] The present invention has the advantages that:

[0015] 1. The energy-saving additive of the present invention can reduce the surface tension of water, making it easier for water to come into contact with the heat exchange surface (such as heat exchangers, radiators, fan coils), thereby increasing the effective area of ​​heat transfer and improving the overall heat exchange efficiency.

[0016] 2. Energy-saving additives reduce surface tension, help alleviate the laminar effect of the fluid, and promote the formation of turbulence. Turbulence can increase the mixing inside the fluid, make the heat more evenly distributed, and reduce the flow resistance of the fluid in the pipe or channel, making the water easier to flow, further improving the heat exchange efficiency.

[0017] 3. The energy-saving additives of the present invention are all naturally degradable compounds, which have no adverse effects on water quality and the environment. At the same time, the preparation method is simple and easy to operate.

[0018] 4. Good energy-saving effect, energy-saving rate of more than 10%, can be directly added to the existing system during use, without special changes or long-term downtime. It is compatible with various types of systems, whether new or existing old systems, and can be easily integrated without affecting system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The "energy-saving agent" in the accompanying drawings refers to the energy-saving additive of the present invention.

[0020] Attached Figure 1 This is a schematic diagram of the heat exchange surface of the system before and after using the energy-saving additive of the present invention, the left side is without using the energy-saving additive, and the right side is with using the energy-saving additive.

[0021] Attached Figure 2 This is a schematic diagram of the system flow before and after the use of energy-saving additives. The left side is without the use of energy-saving additives, and the right side is with the use of energy-saving additives.

[0022] Attached Figure 3 This is a schematic diagram of the system response before and after using energy-saving additives. The left side is before adding energy-saving additives, and the right side is after adding energy-saving additives.

[0023] Attached Figure 4 This is a diagram of system temperature changes before and after using energy-saving additives.

[0024] Attached Figure 5 This is a graph of water surface tension measured by pendant titration. DETAILED DESCRIPTION

[0025] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0026] The amounts of energy-saving additive raw materials used in the following examples are all measured by weight unless otherwise specified. All raw materials used are obtained from commercial sources unless otherwise specified.

[0027] The sulfate compounds used (sodium dodecyl sulfate, sodium lauryl ether sulfate, sodium dodecyl alcohol ether sulfate) were purchased from Changde Beekman Biotechnology Co., Ltd.

[0028] The alkyl glucosides used (octyl glucoside, decyl glucoside, dodecyl glucoside, and coconut glucoside) were purchased from Jiangsu Wanqi Biotechnology Co., Ltd.

[0029] The polydimethylsiloxane emulsion used was purchased from Hebei Fengjia Biotechnology Co., Ltd.

[0030] The polyethylene glycols (PEG-200, PEG-400, PEG-600, PEG-800, and PEG-1000) used were purchased from Wuxi Yatai United Chemical Co., Ltd.

[0031] The butylated hydroxytoluene used was purchased from Shandong Yousuo Chemical Technology Co., Ltd.

[0032] The ethoxylates used (fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester) were purchased from Shandong Yousuo Chemical Technology Co., Ltd.

[0033] Example 1

[0034] Dissolve 2 parts of dodecyl glucoside in 100 parts of deionized water to form a homogeneous solution, then add 2 parts of sodium lauryl sulfate, 0.75 parts of polydimethylsiloxane emulsion, 0.4 parts of PEG-400, 0.75 parts of fatty alcohol polyoxyethylene ether, and 0.03 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0035] The energy-saving additive prepared in this embodiment was used in a cold storage system of a hotel in Shanghai at a mass ratio of 1%. After 12 months of use, compared with not using the energy-saving additive, the annual energy saving was 65997 kWh, and the energy saving rate was 10.41%.

[0036] Example 2

[0037] Dissolve 4 parts of decyl glucoside in 110 parts of deionized water to form a homogeneous solution, and then add 4 parts of sodium lauryl ether sulfate, 1 part of polydimethylsiloxane emulsion, 0.5 parts of PEG-800, 1 part of fatty alcohol polyoxyethylene ether, and 0.05 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0038] The energy-saving additive prepared in this embodiment was used in a HVAC system of a dust-free workshop in a factory in Suzhou at a mass ratio of 1.5%. After being used for 3 months, compared with not using the energy-saving additive, the energy saving in three months was 3366 kWh, and the energy saving rate was 12.19%.

[0039] Example 3

[0040] Dissolve 5 parts of octyl glucoside in 110 parts of deionized water to form a homogeneous solution, then add 5 parts of sodium lauryl ether sulfate, 0.5 parts of polydimethylsiloxane emulsion, 0.2 parts of PEG-600, 0.5 parts of fatty acid polyoxyethylene ester, and 0.01 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0041] The energy-saving additive prepared in this embodiment was used in a cooling system of an energy station of an office building in Shanghai at a mass ratio of 2%. After one month of use, the energy saving rate was 15.28% compared with that without using the energy-saving additive.

[0042] Example 4

[0043] Dissolve 1 part of coconut glucoside in 90 parts of deionized water to form a homogeneous solution, and then add 1 part of sodium lauryl ether sulfate, 3 parts of sodium lauryl sulfate, 0.1 part of polydimethylsiloxane emulsion, 1 part of PEG-1000, 0.5 parts of fatty acid polyoxyethylene ester, 2.5 parts of fatty alcohol polyoxyethylene ether, and 0.1 part of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0044] The energy-saving additive prepared in this embodiment was used in a heating system of a residential area in Xi'an at a mass ratio of 2.5%. After one month of use, compared with not using the energy-saving additive, the energy saving rate was 20.65% after five months of use, i.e., a complete heating season.

[0045] Example 5

[0046] Dissolve 1 part of octyl glucoside and 4 parts of dodecyl glucoside in 130 parts of deionized water to form a homogeneous solution, and then add 4 parts of sodium lauryl ether sulfate, 6 parts of sodium lauryl sulfate, 5 parts of polydimethylsiloxane emulsion, 2 parts of PEG-600, 3 parts of PEG-800, 1 part of fatty acid polyoxyethylene ester, 4 parts of fatty alcohol polyoxyethylene ether, and 0.09 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0047] The energy-saving additive prepared in this embodiment was used in a central air-conditioning system of a hotel in Shanghai at a mass ratio of 0.5%. After one month of use, compared with the case where no energy-saving additive was used, the daily energy saving was 6775 kWh, and the energy saving rate was 14.74%.

[0048] Example 6

[0049] Dissolve 2 parts of dodecyl glucoside in 100 parts of deionized water to form a homogeneous solution, and then add 1 part of sodium lauryl ether sulfate, 1 part of polydimethylsiloxane emulsion, 2 parts of PEG-200, 1 part of PEG-800, 0.1 parts of fatty acid polyoxyethylene ester, and 0.05 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0050] The energy-saving additive prepared in this example was used in a boiler water circulation system of a hotel in Shanghai at a mass ratio of 3%. After being used for 39 days, the energy-saving rate was 16.13% compared with that without using the energy-saving additive.

[0051] Example 7

[0052] Dissolve 3 parts of dodecyl glucoside in 100 parts of deionized water to form a homogeneous solution, then add 7 parts of sodium lauryl ether sulfate, 1 part of polydimethylsiloxane emulsion, 0.1 parts of PEG-600, 0.1 parts of fatty alcohol polyoxyethylene ether, and 0.05 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0053] Example 8

[0054] Dissolve 4 parts of decyl glucoside in 120 parts of deionized water to form a homogeneous solution, and then add 1 part of sodium lauryl sulfate, 7 parts of sodium lauryl ether sulfate, 3 parts of polydimethylsiloxane emulsion, 2 parts of PEG-600, 2 parts of fatty alcohol polyoxyethylene ether, and 0.05 parts of butylated hydroxytoluene. After adding each component, stir it thoroughly to ensure that it is evenly dispersed and completely dissolved, so as to obtain an energy-saving additive.

[0055] Example 9: Action Principle and Experimental Test of Energy-Saving Additives

[0056] 1. The core principle of energy-saving additives is to reduce the surface tension of water, making it easier for water to come into contact with the heat exchange surface (such as heat exchangers, radiators, and fan coils), thereby increasing the effective area of ​​heat transfer. Specifically, surface tension is the force formed by the attraction of liquid surface molecules to internal molecules. This force causes the liquid to tend to reduce the surface area in contact with other materials. Lowering the surface tension of water makes it easier for water molecules to spread on the heat exchange surface rather than gathering into droplets, so that they can absorb or release heat energy more effectively, greatly speeding up the heat energy transfer process and improving the overall heat exchange efficiency. The schematic diagram of the heat exchange surface of the system before and after using the energy-saving additive of the present invention is shown in the figure. Figure 1 shown.

[0057] 2. Energy-saving additives can reduce surface tension at the same time, which helps to reduce the laminar effect of the fluid and promote the formation of turbulence. Turbulence can increase the mixing inside the fluid, making the heat more evenly distributed, thereby improving the heat exchange efficiency. Energy-saving additives can reduce the flow resistance of the fluid in the pipe or channel by reducing surface tension, making the water easier to flow and further improving the heat exchange efficiency. The flow diagram of the system before and after using energy-saving additives is shown below. Figure 2 shown.

[0058] 3. From the perspective of HVAC (heating, ventilation and air conditioning) technology, optimizing the heat exchange efficiency of the heat exchanger can effectively improve the system's rapid adaptation to dynamic heat load changes. Since the heat load demand of the building space is dynamic during the day, such as solar radiation causing the heat load to decrease; or ventilation causing the energy demand to increase, the system must be able to respond in a timely manner. However, the heating / cooling system usually causes energy loss and oversupply due to "heat load inertia". By speeding up the system feedback response speed and reducing unnecessary energy consumption caused by response delays, energy saving can be achieved. The schematic diagram of the system response before and after using energy-saving additives is shown below. Figure 3 shown.

[0059] Under laboratory conditions, it was observed that the system with the energy-saving additive (prepared in Example 1, 1% wt dosage) heated up faster than the control group (water only) under the same conditions and could maintain the high temperature for a longer time. More importantly, during the entire continuous test period of nearly 7 hours (25,000 seconds), the experiment found that the number of cycles of the corresponding boiler using the energy-saving additive was reduced by one compared with the control group. The experimental data are as follows Figure 4 shown.

[0060] The experiment found that when the energy-saving additive (prepared in Example 1) was used in an amount of 0.5%wt, that is, the concentration of the energy-saving additive was 5000ppm, the pH of the system circulating water was 7.6, and the surface tension was 35.6mN / M. Figure 5 This is a graph of water surface tension measured by pendant titration method when the amount of energy-saving additive used is 0.5%wt; when the amount of energy-saving additive used is 1%wt, that is, the concentration of energy-saving additive is 10000ppm, the pH of system circulating water is 7.7, and the surface tension is 26.8mN / M; when the amount of energy-saving additive used is 2%wt, that is, the concentration of energy-saving additive is 20000ppm, the pH of system circulating water is 7.8, and the surface tension is 25.4mN / M; when the amount of energy-saving additive used is 3%wt, that is, the concentration of energy-saving additive is 30000ppm, the pH of system circulating water is 8.0, and the surface tension is 25.5mN / M; when the amount of energy-saving additive used is 4%wt, that is, the concentration of energy-saving additive is 40000ppm, the pH of system circulating water is 8.8, and the surface tension is 25.6mN / M; the control group is just a water system, the pH is 7.4, and the surface tension is 70.5mN / M. The experimental results show that when the energy-saving additive is used in an amount of 4%wt, the water surface tension does not change much compared to when it is used in an amount of 3%wt, but the pH changes significantly. Therefore, the energy-saving additive of the present application is added to water at a ratio of 0.5%-3% of the mass of the circulating water in the HVAC system, and the preferred usage is 1%-2%wt.

[0061] Comparative Example 1

[0062] The components are: 100 parts of deionized water, 2 parts of sodium lauryl sulfate, 0.75 parts of polydimethylsiloxane emulsion, 0.4 parts of PEG-400, 0.75 parts of fatty alcohol polyoxyethylene ether, and 0.03 parts of butylated hydroxytoluene. Compared with Example 1, 2 parts of dodecyl glucoside are not added, and the preparation method is the same as Example 1.

[0063] Comparative Example 2

[0064] The components are: 100 parts of deionized water, 2 parts of dodecyl glucoside, 2 parts of sodium lauryl sulfate, 0.4 parts of PEG-400, 0.75 parts of fatty alcohol polyoxyethylene ether, and 0.03 parts of butylated hydroxytoluene. Compared with Example 1, 0.75 parts of polydimethylsiloxane emulsion is not added, and the preparation method is the same as Example 1.

[0065] Comparative Example 3

[0066] The components are: 100 parts of deionized water, 2 parts of sodium lauryl sulfate, 0.4 parts of PEG-400, 0.75 parts of fatty alcohol polyoxyethylene ether, and 0.03 parts of butylated hydroxytoluene. Compared with Example 1, 2 parts of dodecyl glucoside and 0.75 parts of polydimethylsiloxane emulsion are not added, and the preparation method is the same as Example 1.

[0067] Take the energy-saving agents prepared in Example 1, Comparative Example 1, Comparative Example 2 and Comparative Example 3 of equal mass, add them into water at a mass ratio of 2%, and measure their water surface tension and energy-saving effect. Use a surface tension meter to measure the water surface tension. Under the same conditions, evaluate the energy-saving effect of each composition (GB / T 28750-2012 "Technical General Rules for Energy Saving Measurement and Verification"). Since the turbulence effect is difficult to quantify, the improvement effect of each composition under the same conditions is evaluated by observing the fluidity and flow rate changes of the water flow in the HVAC system. The measurement results are shown in Table 1.

[0068] Table 1 Effects of energy-saving additives prepared in Examples and Comparative Examples after use

[0069]

[0070] It can be seen from the experimental data that without adding dodecyl glucoside or / and polydimethylsiloxane emulsion, the energy saving rate is greatly reduced, which also shows that dodecyl glucoside, polydimethylsiloxane emulsion and sodium lauryl sulfate can work together to significantly reduce the surface tension of water and improve turbulence. The energy-saving additive prepared by the formula of Example 1 performs well. The lower surface tension means that the composition can more effectively wet and cover the internal surfaces in the HVAC system, thereby improving the heat transfer efficiency. For the HVAC system, significantly increasing the water flow rate and enhancing the turbulence phenomenon are beneficial to improving the heat exchange efficiency and contributing to the improvement of the overall energy efficiency of the system.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. An energy-saving additive for a HVAC system using water as a heat carrier, characterized in that: The invention comprises the following components in parts by weight: 1-10 parts of sulfate compounds, 1-5 parts of alkyl glucoside, 0.1-5 parts of polydimethylsiloxane emulsion, 0.1-5 parts of polyethylene glycol, 0.1-5 parts of ethoxylate, 0.01-0.1 parts of antioxidant and 90-130 parts of deionized water; the sulfate compounds are one or more of sodium lauryl sulfate, sodium lauryl ether sulfate and sodium dodecyl alcohol ether sulfate; the alkyl glucoside is one or more of octyl glucoside, decyl glucoside, dodecyl glucoside and coconut glucoside; the polyethylene glycol is PEG-200, PEG-400, PEG-600, PEG-800 or PEG-1000; the ethoxylate is one or two of fatty alcohol polyoxyethylene ether and fatty acid polyoxyethylene ester.

2. The energy-saving additive according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 1-5 parts of sulfate compounds, 2-5 parts of alkyl glucoside, 0.5-1 parts of polydimethylsiloxane emulsion, 0.2-0.5 parts of polyethylene glycol, 0.5-1 parts of ethoxylate, 0.01-0.05 parts of antioxidant and 100 parts of deionized water.

3. The energy-saving additive according to claim 1, characterized in that: The antioxidant is butylated hydroxytoluene.

4. The method for preparing the energy-saving additive according to any one of claims 1 to 3, characterized in that: Firstly, the alkyl glucoside is dissolved in deionized water to form a homogeneous solution, and then sulfate compounds, polydimethylsiloxane emulsion, polyethylene glycol, ethoxylate, and antioxidant are added. After each component is added, it is fully stirred to ensure that it is evenly dispersed and completely dissolved, so as to obtain the energy-saving additive.

5. The use of the energy-saving additive according to any one of claims 1 to 3, characterized in that: Add energy-saving additives into the water at a ratio of 0.5%-3% of the mass of the circulating water in the HVAC system.

6. The use according to claim 5, characterized in that: Add energy-saving additives into the water at a ratio of 1%-2% of the mass of the circulating water in the HVAC system.

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