• Discussion on new technology of air conditioning cold and heat source in medical clean engineering
    Discussion on new technology of air conditioning cold and heat source in medical clean engineering 2019-02-06
    With the development of science and technology, a large number of new ideas and new technologies have been accepted and applied, which has created favorable conditions for improving the medical environment and medical facilities of hospitals. At the same time, it has put forward higher requirements for hospital medical facilities. The air conditioning system faces outstanding challenges. The operating room, ICU, CCU, PICU, NICU, EICU, central supply, venous fluid distribution center, genetic reproductive center, etc. have strict requirements on temperature and humidity, and have both hot and cold demand throughout the year. The volume of the building for medical cleansing is usually large, and the load characteristics of the inner and outer areas vary greatly, especially in the winter or transition season. When the outer area needs to send heat, the inner area needs to be cooled all year round due to overheating. For air-conditioning systems that operate intermittently in medical clean-up projects, the inner zone should consider the problem of warm-up of the air-conditioning system during the winter. There is cooling demand in the transition season and winter inner zone. The chiller is self-protected due to low ambient temperature and cannot be started normally. In order to meet the above-mentioned hot and cold demand for medical clean equipment projects, it is conceivable to centrally set up cold and heat sources to achieve comprehensive utilization of energy; comprehensively consider the characteristics of hot and cold load and hot water demand in the transitional season and winter medical clean equipment projects, it is recommended to use four regulations. Functional heat pump unit or small heat and cold station (6 regulated multi-function heat pump). Four-control multi-function heat pump unit The four-control multi-function heat pump unit can obtain condensed heating hot water from the condenser while obtaining chilled water in the evaporator, and the cold and heat imbalance parts are discharged through the balance heat exchanger, thereby achieving continuous simultaneous cooling and heating. And only input one energy will get both cold and heat, which will greatly reduce energy consumption and reduce emissions. Using the comprehensive energy efficiency TER to evaluate the efficiency of the unit in the simultaneous cooling and heating mode, the scroll compressor unit TER>7, the screw compressor unit TER>8. The four-control multi-function heat pump unit integrates cold and heat sources. One unit has four tubes, two for chilled water inlet and outlet, two for hot water inlet and outlet, cold and hot automatic balance, cooling capacity and heating capacity can be realized separately. 0~100% independent adjustment. The four-control multi-function heat pump hot and cold water unit should meet the requirements of cold and heat load in summer and winter design conditions, and should also meet the requirements of non-full load. Therefore, there...
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  • Five methods of constant temperature aquaculture, H.Stars heat pump effectively solves water temperature control problems
    Five methods of constant temperature aquaculture, H.Stars heat pump effectively solves water temperature control problems 2019-01-25
    With the development trend of modernized fisheries such as shrimp, crab and fish in factory farming, factory farming requires certain conditions. Controlling water temperature is a key technology. Shrimp, shellfish seedlings, groupers, squids, etc. require water temperature at 22 °C ~ 25 °C or so. In winter, the culture water needs to be warmed up. In summer, the culture water needs to be cooled. When the water temperature is controlled in a suitable environment, the breeding survival rate can be effectively improved and the breeding density can be greatly improved, thereby effectively improving the economic benefits of the farmers. In terms of aquaculture constant temperature, most of the farmer equipment is backward. Many winter farms still rely on boiler burning coal mode, which not only pollutes the environment, but also solves the problem of heating in winter. When cooling seawater in summer, it is necessary to set up cooling equipment. . The traditional method of extracting underground seawater directly into seawater to reduce seawater temperature seriously wastes groundwater resources and destroys the water source environment required for breeding. Aquaculture constant temperature method (1) Aquaculture can be roughly divided into 2 categories according to the farming method and indoor requirements. This time, let us first popularize the first category: the heating pool heating tube heating constant temperature mode. This type of heating can be applied to almost all thermostats in aquaculture projects. The water in the pool is dissipated (the surface of the pool is cooled to the environment, the heat of the pool to the pool and the wall, and the heat load required by the fresh water) causes the water temperature to drop. Therefore, it is necessary to ensure that the heat supplied to the pond meets the loss of the pool. The heat can guarantee the constant temperature of the water body. For the demand, the heat provided by our system design heat pump heating is equal to the maximum heat dissipation of the pool. The temperature difference between the inlet and outlet water of the constant temperature pipeline of the tank body may be greater than the temperature difference between the feed water and the return water of the heat pump. Therefore, the system is designed to add an intermediate water tank to ensure the temperature of the inlet and outlet water of the water body is stable. The factors affecting the selection of the heat pump main unit are the maximum heat loss rate of the water body. There are three factors affecting the heat dissipation of the water body: the heat dissipation from the pool to the environment, the heat dissipation from the water body to the bottom of the pool or the wall of the pool, and the heat demand from the new water. For the whole project, we must pay attention to the insulation of the greenhouse in the pool and the thermal insulation of the pool. It is also necessary to control the amount of water exchange to...
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  • Chinese New Year/Spring Festival  Holiday Notice
    Chinese New Year/Spring Festival Holiday Notice 2019-01-23
    Dear Valued VIP Customers: Please note that H.Stars Group will be closed from Jan. 27 to Feb. 12 ,2019 for Chinese New Year /Spring Festival, and we will come back to work on Feb. 13, 2019 . H.Stars Group would like to express our best wishes to you during this festival season. We appreciate your business and look forward to serving you at all times. Wish you all the warmest of holiday cheer ! Sorry for the inconvenience , if you are in need of any assistance or support from our side during the holiday, welcome to contact at any time  sales@hstars.com.cn or +8618665672648 May the upcoming year bring you and your family health, happiness, safe and a joyous holiday season. Yours Truly H.Stars Group
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  • Zero Pollution Heat Pump Project
    Zero Pollution Heat Pump Project 2019-01-11
    Zero Pollution Heat Pump Project The first regional “coal to electricity” clean heating pilot demonstration project invested by Shanxi Environmental Protection (SEPG)and Shanxi Huannuo Environmental Protection Co., Ltd. in Linyou County, after 2 months of intense construction, currently, 5 heating stations and 2 single hanging points have been completed and put into use, providing clean heating services for the 260,000 ㎡ of users in the eastern part of Linyou County. 【Reporter: This is the clean energy heating station of HuiMing Community in Linyou County. The equipment behind me is the air source heat pump system. It mainly uses electrical energy to absorb heat from the air. Heating water temperature and Central heating after conversion . While achieving high-efficiency heating, this system also exerts its characteristics of environmental protection, energy saving and emission reduction. It can be said that it has basically achieved zero pollution. 】 Before 2018, the heating system of Linyou County was based on the central heating through underground thermal pipe network. Due to the old pipe network, insufficient flow and large heat loss in many places in the old city, heating quality and standards are difficult to meet the masses demand. This year, after Shanxi Environmental Protection Group implemented the “coal to electricity” clean heating pilot demonstration project in Linyou County, after more than a month of operation, residents generally reported that this winter heating is not only high temperature, but also the air quality has been greatly improved. 【Feng Zhigang, resident of Linyou county said: the temperature is good this year. It keeps around 20 degrees. You can't feel cold in here.】 【Ms. Li, resident of Linyou county: in terms of hygiene, last year's hygiene was not as good as this year's overall, last year the air was dusty, but this year the air is much cleaner than before. 】 Ma Xiang dong, Chairman of Shanxi Huannuo Environmental Protection Co., Ltd. told reporters that in the implementation of the “coal to electricity” clean heating pilot demonstration project in Linyou County, they passed the preliminary investigation and demonstration and expert review, based on the winter weather data of Linyou County and the old city. The building is free of external wall insulation and heat dissipation from the end radiator, which is solved by an air source heat pump system. The project is designed according to the distributed central heating method. A total of five clean heating energy stations will be built. Each heating season can save about 5712 tons of coal, reducing the emission of various harmful substances by more than 10,000 tons. The energy saving and environmental protection benefits are very significant. 【Ma Xiang dong, Chairman of Shanxi Huannuo Environmental Protection Co., Ltd.: If we use the "coal to electricity" clean energy heating system can ...
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  • Comparison of advantages and disadvantages of 5 commonly used chillers
    Comparison of advantages and disadvantages of 5 commonly used chillers 2018-12-26
    01 Piston type chiller Advantage: 1. The material is simple, the general metal material can be used, the processing is easy, and the cost is low; 2. The system device is simple, easy to lubricate, and does not require an exhaust device; 3. With multi-head, high-speed multi-cylinder, performance can be improved. Disadvantages: 1. Many parts, more wearing parts, complicated maintenance, frequent, high maintenance costs; 2. The compression ratio is low, and the cooling capacity of the single machine is small; 3. The adjustment performance of the single head part under partial load is poor, the cylinder is adjusted, and it cannot be adjusted steplessly; 4. It is a reciprocating movement up and down, and the vibration is large 5. The rated cooling capacity has a large weight index. 02 Screw type chiller Advantage: 1. Simple structure, less moving parts, less wearing parts.(only 10 percent of the piston type), low failure rate and long service life; 2. The circular motion is stable, there is no "surge" phenomenon during low load operation, low noise and low vibration; 3. The compression ratio can be as high as 20 and the EER value is high; 4. It is convenient to adjust, can be steplessly adjusted within the range of 10%~100%, high efficiency at partial load, and significant power saving; 5. Small size and light weight, it can be made as a stand type fully enclosed large capacity unit; 6. Not sensitive to wet strokes; 7. It is a positive pressure operation, and there is no problem of intrusion of outside air. Disadvantages: 1. The price is higher than the piston type; 2. The capacity of single unit  is smaller than the centrifugal type, and the rotation speed is lower than the centrifugal type; 3. The lubricating oil system is more complicated and consumes a lot of fuel; 4. Large-capacity unit noise is higher than centrifugal type; 5. Requires high machining accuracy and assembly accuracy. 03 Centrifugal chiller Advantage: 1. The impeller has high speed, large gas transmission volume and single machine has large capacity; 2. Less wearing parts, reliable work, compact structure, stable operation, low vibration and low noise; 3. The unit cooling capacity weight index is small; 4. The lubricating oil is not mixed in the refrigerant, and the heat transfer performance of the evaporator and the condenser is good; 5. The EER value is high, and the theoretical value can reach 6.99. 6. Easy to adjust, stepless adjustment within 10%~100%. Disadvantages: 1. The single-stage compressor will have a "surge" phenomenon at low load, but run smoothly at full load; 2. Strict requirements for material strength, processing accuracy and manufacturing quality; 3. When the operating condition deviates from the design working condition, the efficiency decreases rapidly, and the cooling capacity decreases with the evaporation temperature and decreases faster than the piston type; 4. Centrifugal negative pressure system, the outside air is easy to invade, there is a danger ...
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  • What causes the water-cooled condenser temperature to be abnormally high?
    What causes the water-cooled condenser temperature to be abnormally high? 2018-12-26
    What we are talking about here refers to water-cooled condenser, which is mainly used in water-cooled chillers. Its function is to condense the high-temperature refrigerant vapor discharged from the compressor into a liquid refrigerant, which is an important part of the refrigeration system to radiate heat to the surrounding environment. This equipment is one of the four major components of chiller. Its quality directly affects the cooling capacity and cooling efficiency. During the working process of the water-cooled chiller refrigeration system, the temperature of the outer surface of the condenser is generally close to the normal temperature, and it is not hot when touched by hand. Once the surface temperature is found to be too high, the cause should be identified and measures taken to eliminate it. Generally speaking, the causes that lead to rise of temperature in condenser are mainly due to the problem of cooling water. There are usually four cases: 1. The cooling water inlet and outlet pipes are incorrectly installed. The normal installation position is generally low inlet pipe, high outlet pipe, and “low inlet and high output”. If the inlet pipe position is high, the cooling water may not be fully filled in the condenser, and the heat transfer area will become smaller. The vapor is not effectively condensed, causing rise of temperature on condenser surface 2. The water quality of the cooling water is too bad. The fouling of inner wall of the cooling water pipe in condenser increases thermal resistance, affects heat exchange between refrigerant and cooling water, and reduces the heat transfer effect. This type of failure often occurs in chillers that are used for long periods of time and that are not regularly cleaned. The solution is to remove scale. 3. The cooling water is insufficient and the water pressure is not enough. The water-cooled condenser is latent heat released by the cooling water to take away refrigerant vapor condenser. Therefore, the cooling water pressure is not enough, the flow rate does not reach the rated requirement, the heat dissipation capacity is limited, and finally the temperature of the outer surface of the condenser rises. . 4. The temperature of the cooling water is too high, which is higher than the rated working temperature. The higher the temperature of the cooling water is, the smaller the temperature difference of refrigerant cooling and heat transfer amount are. The less effective cooling of the refrigerant is, the higher the surface temperature of the condenser will be.
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  • How much cost will spend for a 1000m³ cold storage?
    How much cost will spend for a 1000m³ cold storage? 2018-12-25
    I want to transform the bungalow into a cold storage for storing fruits and vegetables. The dimensions are 5*80*2.5m1000 cubic meters, 200 tons storage, and cold storage temperature: +5°C. What is the cost of the cold storage? Many customers are very concerned about the cost of cold storage. Here are some of the six factors that affect the cost of cold storage and the reference to cold storage cost. 1. Geography: The external environment of the cold storage construction area will directly affect the selection and quantity of cold storage materials; 2, temperature: the same library capacity, the lower the temperature, the higher the cold storage cost. Common fresh-keeping warehouse 0~5°C, freezer -15~-25°C, ultra-low temperature -30~-60°C, cool storage ≤20°C; 3, size: the greater the capacity of the cold storage, the higher the cost. The more cooling capacity and insulation materials required, the higher the price of natural cold storage; 4. Function: Some special cold storages are more expensive than ordinary cold storage, such as: explosion-proof warehouse, air-conditioning warehouse; 5, system: different cold storage programs, refrigeration systems also have multiple choices, unit brands, the price difference is large; 6, the compartment: the same capacity cold storage, the number of partitions is different, the number of cold storage equipment configuration is also different, these are also one of the key factors affecting the final cold storage price; Let us take the 0-5°C fresh-keeping library as an example to illustrate the difference in cost between different cold storage capacity spaces. The following quotations are estimated based on the quality of the cold storage and the after-sales basis. *This article is from the HSTARS Group, the copyright belongs to the original owner, if you need to publish, please contact us! H.Stars (Guangzhou) Refrigerating Equipment Group Ltd. No.1 Guoyuan 4th Road,the Northern Part of the Eastern Section of Guangzhou Econmic &Technology Development District,Guangzhou,China. Tex : +86 -20-62266755 ext 605| Fax:  +86 -20-62266081 Phone: +86-18318579201 Whatsapp/wechat/viber : +86-18318579201 E-mails: frank@hstars.com.cn Web: www.hstarschiller.com            ww.heatexchangermaker.com
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  • Merry Christmas and Happy New Year !
    Merry Christmas and Happy New Year ! 2018-12-24
    May the glow of Christmas candle fill your heart with peace and pleasure and make your New Year bright. Have a love filled Christmas and New Year!
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