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China Guangdong Wotech Renewable Energy & Technology Co., Ltd.
Guangdong Wotech Renewable Energy & Technology Co., Ltd.
Guangdong Wotech Renewable Energy & Technology Co., Ltd. (sau đây gọi là Wotech) được thành lập vào năm 2005, tích hợp nghiên cứu và phát triển, sản xuất, tiếp thị,và dịch vụ sau bán của máy bơm nhiệt. FOSHAN SHUNDE HUAMING RENEABLE ENERGY & TECHNOLOGY CO., LTD. (sau đây được gọi là DUHM) là một công ty con của Wotech,được thành lập vào năm 2011.Chúng tôi kết hợp năng lượng tái tạo với công nghệ mới để cung cấp các giải pháp hiệu quả để chúng tôi có thể tạo ra một tương lai bền vững hơn cùng nha
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Hơn 19 năm kinh nghiệm bơm nhiệt với 35 + R & D kỹ sư CNAS Laboratory Accreditation Chúng tôi có thể hợp tác để phát triển các sản phẩm mà bạn cần.
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Tin tức công ty mới nhất về Uzbekistan Customer Visits WOTECH Factory for In-Depth Air-to-Water Heat Pump Technical Evaluation
2026-10-09

Uzbekistan Customer Visits WOTECH Factory for In-Depth Air-to-Water Heat Pump Technical Evaluation

Uzbekistan Customer Visits WOTECH Factory for In-Depth Air-to-Water Heat Pump Technical Evaluation Factory Tour, Heat Pump Disassembly Demonstration, and Laboratory Testing Plans Strengthen Potential Cooperation in the Central Asian Market Guangdong, China – October 2026 – WOTECH recently welcomed a customer delegation from Uzbekistan to its manufacturing facility in Guangdong, China. The visit focused on WOTECH's air-to-water heat pump solutions, manufacturing capabilities, product design, and technical performance. During the visit, the Uzbek customer expressed strong interest in WOTECH's heating heat pump products. To provide a deeper understanding of the equipment, WOTECH arranged a special heat pump disassembly demonstration, followed by detailed technical discussions with the company's Technical Director. The customer responded positively to the factory visit and requested additional laboratory performance testing, which is scheduled for the following week. Factory Visit: Building Confidence in Manufacturing Capabilities The visit began with an introduction to WOTECH's manufacturing operations, product portfolio, and quality management practices. As a professional heat pump manufacturer with extensive experience in international markets, WOTECH focuses on developing energy-efficient heating and cooling solutions for residential, commercial, and industrial applications. The Uzbek customer was particularly interested in air-to-water heat pumps designed for space heating, an important application in Central Asian markets where winter heating performance, reliability, and energy efficiency are critical considerations. Heat Pump Disassembly: A Closer Look at Product Engineering One of the highlights of the visit was a specially arranged heat pump disassembly demonstration. Rather than relying solely on product brochures and technical specifications, WOTECH provided the customer with an opportunity to examine the internal construction and major components of the heating equipment. The demonstration covered several important engineering aspects: Compressor Technology: Compressor configuration and its role in heating performance and energy efficiency. Heat Exchanger Design: Heat transfer efficiency, component arrangement, and system integration. Refrigerant Circuit: Refrigerant piping layout, expansion control, and overall system design. Electrical Control System: Electronic control components, inverter technology, and operational protection. Structural Engineering: Internal component arrangement, accessibility, and maintenance considerations. Product Reliability: Manufacturing details and design considerations affecting long-term operation. Through this hands-on demonstration, the customer gained a clearer understanding of WOTECH's product engineering philosophy and manufacturing standards. Direct Technical Discussions with WOTECH's Technical Director Following the disassembly demonstration, the Uzbek customer held detailed discussions with WOTECH's Technical Director. The conversation focused on technical aspects of air-to-water heat pump systems, including operating conditions, system configuration, performance evaluation, and product suitability for the Uzbekistan market. For heating applications in Central Asia, selecting a suitable heat pump requires careful consideration of local winter temperatures, building heating loads, required water supply temperatures, and overall system design. The technical exchange allowed both parties to discuss the customer's requirements and explore how WOTECH's heating solutions could potentially support local applications. The customer appreciated the opportunity to communicate directly with WOTECH's engineering team and obtain detailed explanations of the product's design and operating principles. Laboratory Performance Testing Scheduled for Next Week To further evaluate the heat pump's technical performance, the customer requested that a sample unit undergo laboratory testing. WOTECH has arranged the testing for the following week. The planned evaluation will provide an opportunity to examine the sample unit's operating characteristics under defined laboratory conditions. Specific test conditions and performance indicators will be confirmed in accordance with the agreed technical requirements. Laboratory testing is an important part of the product evaluation process, particularly for international customers seeking reliable heating equipment for markets with demanding winter conditions. The upcoming tests will provide additional technical data to support the customer's product assessment and potential future cooperation. Exploring Opportunities in Uzbekistan and Central Asia Uzbekistan represents a potential market for energy-efficient heating technologies, particularly as customers evaluate alternatives to conventional heating systems. Air-to-water heat pumps can provide space heating and domestic hot water when properly selected and integrated into suitable hydronic systems. For Central Asian applications, key engineering considerations include low-ambient-temperature performance, heating capacity retention, supply water temperature, defrost management, and system reliability. WOTECH remains committed to working with international distributors, installers, and engineering companies to provide technically appropriate heat pump solutions for different climates and applications. A Positive Visit and a Promising Step Toward Future Cooperation Overall, the visit was highly productive, with the Uzbek customer expressing a high level of satisfaction with WOTECH's manufacturing capabilities, product design, and technical support. The heat pump disassembly demonstration and direct discussions with the Technical Director helped establish greater technical understanding and confidence between both parties. With laboratory testing scheduled for the following week, WOTECH looks forward to continuing the technical evaluation and exploring potential business opportunities with its Uzbek partner. At WOTECH, we believe that strong international partnerships begin with transparent manufacturing, open technical communication, and verifiable product performance. About WOTECH Guangdong WOTECH Renewable Energy & Technology Co., Ltd. is a professional heat pump manufacturer established in 2005, specializing in air-to-water heat pumps, swimming pool heat pumps, domestic hot water heat pumps, and commercial heating and cooling solutions. With advanced manufacturing facilities, dedicated R&D teams, and laboratory testing capabilities, WOTECH provides OEM and ODM solutions to international distributors, engineering contractors, and HVAC professionals. Website: www.ecoheat-pump.com Business Cooperation: International distributors, HVAC contractors, and OEM/ODM partners are welcome to contact us for product information and technical discussions.
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Tin tức công ty mới nhất về One Heat Source, Two Terminals: Why Is the Underfloor Heating Not Warm Enough? Part 7 — Long-Term Operation Without Cleaning the Underfloor Heating System
2026-09-29

One Heat Source, Two Terminals: Why Is the Underfloor Heating Not Warm Enough? Part 7 — Long-Term Operation Without Cleaning the Underfloor Heating System

One Heat Source, Two Terminals: Why Is the Underfloor Heating Not Warm Enough? Part 7 — Long-Term Operation Without Cleaning the Underfloor Heating System An air-to-water heat pump system may work perfectly when it is first commissioned. The water temperature is correct, the circulation flow is sufficient, and every room reaches the required temperature. But after several years of operation, something gradually changes: The heat pump is still running, but the floor does not feel as warm as before. The homeowner may increase the leaving water temperature from 40°C to 45°C, or even higher. Indoor comfort may improve temporarily, but electricity consumption increases and the original problem remains. In many cases, the problem is not the heat pump itself. It may be caused by something much less visible: The hydronic system has been operating for years without proper cleaning and maintenance. This is Part 7 of our “One Heat Source, Two Terminals” engineering series, focusing on how sludge, scale, suspended solids and dirty strainers can gradually reduce the performance of underfloor heating connected to an air-to-water heat pump. 1. Why Can a Closed Heating System Become Dirty? A common question is: “The underfloor heating system is closed. Why does it need cleaning?” A closed system does not mean a permanently clean system. Over years of operation, the circulating water interacts with pipes, valves, manifolds, pumps, heat exchangers and other metallic or polymer components. Depending on water quality, system materials, oxygen ingress, installation cleanliness and operating conditions, deposits can gradually develop. Typical contaminants include: mineral scale; corrosion products; magnetite or iron oxide; suspended solids; construction debris; biological contamination in certain conditions; sludge accumulated in low-flow areas. The exact mechanism varies from system to system. The important engineering point is that water quality changes over time, and contaminants can gradually accumulate inside the hydronic circuit. 2. What Happens Inside an Underfloor Heating System After Years of Operation? Underfloor heating contains long pipe circuits operating at relatively low water temperatures. If contaminants are present, they can gradually settle or adhere to internal surfaces. This process may be slow enough that the homeowner does not notice a sudden failure. Instead, system performance deteriorates progressively. The sequence can look like this: Contamination → Internal Deposits → Increased Hydraulic Resistance → Reduced Water Flow → Lower Heat Transfer → Colder Floor → Longer Heat Pump Runtime Eventually, the customer reports: “The heat pump used to heat the house very well. Now it doesn't.” That statement is important because it suggests that we should investigate not only equipment capacity but also how the hydraulic system has changed since commissioning. 3. Scale Is Particularly Harmful to Heat Transfer Mineral scale deserves special attention. Hard water contains dissolved minerals, primarily calcium and magnesium compounds. Under suitable conditions, these minerals can precipitate and form deposits on heat-transfer surfaces. Why does this matter? Because scale has much lower thermal conductivity than metal. The heat-transfer path changes from: Hot Water → Heat Exchanger Surface → System Water to something closer to: Hot Water → Scale Layer → Heat Exchanger Surface → System Water The scale acts as additional thermal resistance. Even a relatively thin layer of deposit on a critical heat-transfer surface can negatively affect performance. The exact efficiency loss depends strongly on the material, deposit composition, thickness, flow conditions and heat exchanger design, so a universal percentage should not be assumed for every system. The engineering principle, however, is clear: Deposits on heat-transfer surfaces reduce heat-transfer effectiveness. 4. Why Increasing the Water Temperature Is Not the Real Solution This is a common field response. Suppose the system originally provided adequate heating at a leaving water temperature of 40–45°C. Several years later, the customer complains that the rooms are cold. Someone changes the setpoint to 50°C. The house becomes warmer again. Problem solved? Not necessarily. Increasing water temperature may simply compensate for deteriorating system performance. The actual problem could still be: Reduced flow + fouling + poor heat transfer. For a heat pump system, unnecessarily increasing leaving water temperature is especially undesirable because heat pump efficiency generally decreases as the required water temperature increases, all else being equal. So instead of immediately raising the setpoint, ask: Why does the system now require a higher water temperature than it did when it was new? That question often leads to a much better diagnosis. 5. The Strainer Is One of the First Places to Check When troubleshooting an older hydronic system, the strainer or filter should be high on the inspection list. Why? Because the filter is designed to capture contamination before it reaches sensitive system components. After years of operation, a neglected strainer may contain significant amounts of: sludge; rust particles; scale fragments; construction residue; other suspended solids. As the filter becomes clogged, pressure drop increases. The result is: Dirty Strainer → Higher Resistance → Lower Flow → Reduced Heat Transport This can produce symptoms remarkably similar to an undersized circulation pump. Before replacing the pump, check whether the existing pump is simply trying to push water through a heavily restricted filter. 6. Low Water Flow Directly Affects Heating Capacity Hydronic heat transfer can be represented approximately by: Q = ṁ × Cp × ΔT where: Q = heat-transfer rate ṁ = water mass flow rate Cp = specific heat capacity of water ΔT = supply/return water temperature difference This equation explains why system cleanliness and water flow are connected to heating performance. If deposits or clogged components increase resistance, the actual water flow can decrease. If the terminals do not receive sufficient flow, they cannot transfer the required amount of heat into the building. So the heat pump may still be capable of generating the required thermal capacity while the distribution system becomes the bottleneck. This is why we repeatedly emphasize: Heat generation and heat distribution must be evaluated separately. 7. Why Some Rooms Become Cold Before Others A contaminated system does not always lose performance uniformly. Some floor heating loops may have: longer pipe lengths; higher hydraulic resistance; lower initial flow rates; more bends; poorer hydraulic balancing. These circuits are often more sensitive to additional resistance. As contamination increases, the weakest circuit may be affected first. The customer may therefore report: “The living room is warm, but the bedroom is cold.” or: “The first floor is okay, but the upper floor takes much longer to heat.” This does not automatically mean the heat pump is too small. Engineers should compare individual manifold flow rates and investigate whether some circuits have become hydraulically restricted. 8. Underfloor Heating Cleaning Is Not Just “Flushing Some Water Through the Pipes” Professional system cleaning should have a clear objective: restore circulation and remove contamination without damaging system components. Depending on system condition and manufacturer requirements, maintenance may include: Inspecting the water condition. Checking system pressure. Inspecting and cleaning strainers. Checking magnetic dirt separators, if installed. Measuring flow before cleaning. Isolating and flushing individual floor heating circuits where appropriate. Removing accumulated sludge and suspended solids. Checking the manifold and flowmeters. Refilling with suitable water. Venting the system completely. Restoring the correct operating pressure. Hydraulically balancing the loops again. Recording flow and supply/return temperatures after maintenance. The exact procedure should follow the system materials, equipment manufacturer's requirements and applicable local water-treatment practices. 9. Water Quality Should Be Considered From the Beginning Cleaning is important, but prevention is better. Water quality should be considered during initial system design and commissioning. Depending on local water conditions and equipment requirements, engineers may need to consider: fill-water quality; hardness; conductivity; pH; oxygen ingress; corrosion protection; filtration; magnetic dirt separation; suitable water treatment. This is especially important because water conditions vary greatly between regions. There is no single water-treatment strategy that should be blindly applied to every heat pump project. Always check the heat pump manufacturer's requirements and relevant local standards. 10. Maintenance Matters Even More in “One Heat Source, Two Terminals” Systems In our series, “One Heat Source, Two Terminals” refers to one air-to-water heat pump serving two different terminal systems, typically: Underfloor Heating + Fan Coil Units Such a system can contain multiple branches, pumps, valves, manifolds and control devices. If contamination increases resistance in one branch, hydraulic distribution between the two terminal systems can change. For example: Heat Pump ↓ Buffer / Hydraulic Distribution ↙　　　　　　　　　↘ Underfloor Heating　　Fan Coils If the underfloor heating circuit gradually becomes more restrictive, the flow distribution may shift. Therefore, troubleshooting should examine the entire hydraulic network rather than treating each component independently. 11. Recommended Troubleshooting Sequence If an underfloor heating system worked well for several years but now struggles to reach temperature, use a systematic approach. Step 1 — Check the heat pump Confirm: leaving water temperature; return water temperature; operating mode; compressor operation; fault history; actual heating capacity where measurable. Step 2 — Check system flow Compare actual flow against the design requirement. Step 3 — Check ΔT An abnormal supply/return temperature difference can provide useful information about circulation and heat transfer. Step 4 — Inspect strainers and filters Do not underestimate this simple step. Step 5 — Inspect manifold flow Compare individual underfloor heating loops. Step 6 — Check for air Air accumulation can produce similar low-flow symptoms. Step 7 — Evaluate water quality Look for discoloration, suspended solids, sludge or other evidence of contamination. Step 8 — Clean where necessary Flush and clean the system using an appropriate procedure. Step 9 — Rebalance After cleaning, restore the correct hydraulic balance. Step 10 — Compare before and after Record: Flow + ΔT + Water Temperature + Room Temperature + Heat Pump Operation This makes the maintenance result measurable rather than subjective. 12. Cleaning Should Be Preventive Maintenance, Not Only Emergency Repair Many customers think about cleaning only after the floor stops heating properly. A better approach is preventive maintenance. However, there is no universal rule that every underfloor heating system must be flushed on exactly the same fixed interval. The appropriate maintenance schedule depends on: local water quality; system materials; operating history; filtration; oxygen ingress; previous contamination; manufacturer requirements. Regular inspection is therefore more useful than blindly applying one interval to every installation. For distributors and HVAC service companies, this also creates an opportunity to move from simply selling equipment toward providing long-term system service. The customer does not only need a heat pump. They need the heating system to continue working efficiently for many years. 13. The Seven Causes We Have Covered So Far Our “One Heat Source, Two Terminals” series has now examined seven common reasons why underfloor heating may not reach the expected temperature: Part 1 — Initial Commissioning or Long Period of Non-Use Part 2 — Air Trapped in the Underfloor Heating Pipes Part 3 — Improper Piping Design and Layout Part 4 — Insufficient Effective Heat Dissipation Area Part 5 — Insufficient System Water Flow Part 6 — Improper Installation and Poor Workmanship Part 7 — Long-Term Operation Without System Cleaning Notice how these problems are connected. For Part 7, the failure chain may look like: Poor Water Quality / Long-Term Contamination ↓ Scale + Sludge + Deposits ↓ Strainer / Pipe / Heat Exchanger Fouling ↓ Higher Hydraulic Resistance ↓ Lower Water Flow and/or Poorer Heat Transfer ↓ Reduced Terminal Heating Output ↓ Underfloor Heating Cannot Reach the Required Temperature That is why professional heat pump troubleshooting must be system-oriented rather than component-oriented. Conclusion: Don't Blame the Heat Pump Too Quickly When an underfloor heating system has been operating for several years and gradually becomes less effective, replacing the heat pump should not be the first response. Start with the basics: Is the water clean? Is the strainer clean? Is the design flow still being achieved? Are the individual floor loops circulating correctly? Has fouling increased the hydraulic resistance? Does the system now require a higher water temperature than it did when originally commissioned? A high-efficiency air-to-water heat pump needs a clean and properly maintained hydronic system to maintain its performance. The complete engineering chain remains: Heat Pump → Water Quality → Hydraulic Flow → Distribution → Terminals → Heat Transfer → Indoor Comfort Maintaining only the heat pump while ignoring the water system is maintaining only half of the heating system.  
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