Weak current College】 【high temperature water source heat pump in case of geothermal heating.

<br> Abstract: the present situation of geothermal heating applications, introduces a new high temperature geothermal, water source heat pump heating programme. In compared the various conventional heating mode of economic and environmental benefits for low temperature geothermal water, geothermal water and other various .temperature in 30-60 ¡ .æ of low-grade heat water provides an efficient and reasonable utilization. <br> <br> Key words: high-temperature geothermal heating water source heat pumps;; geothermal energy tail water; environmental protection; <br> <br> Chinese book .classification number: document identification codes: article number: <br> <br> A geothermal heat pump of development and current status <br> <br> The total amount of geothermal resources in China over 98% is low temperature geothermal resources. At present ., China has a large number of low temperature geothermal resources primarily direct use in the bath, heating, cultivation, farming, health, entertainment, etc. Although the total amount of direct use of the country has reached 2410MW forefront world countries, but the use .of level 1 and efficiency is lower, 25 ° c ~ 50 ° c temperature of energy utilization is very poor. To achieve sustainable development goals, the country has developed a "10th five-year strategic planning for energy development": for adjustment of the .energy structure, reducing the pollution caused by coal-fired, vigorously develop new energy renewable energy utilization technology, which refers to the development of geothermal heat pump technologies to take full advantage of geothermal resources. <br> <br> Geothermal energy as a clean .energy source used for heating in the rapid development of our northern cities, Tianjin geothermal heating area reaches 8 million square meters, the end of 2003, up to 10 million square meters, ranked in the forefront. Beijing geothermal heating area also reached 38 000 sq .m 2. Currently, geothermal heating mainly has three outstanding issues: <br> <br> (A), geothermal heating temperature of water discharged after the tail is relatively high, generally in more than 40 ° c, resulting in a waste of resources .. <br> <br> (2), there are some geothermal field in the case of low temperature geothermal field, geothermal water temperature is lower than 55 ° c, low energy level, cannot be directly for radiator heating hot water-heating circulation .system. <br> <br> (3), geothermal heating temperature of water discharged after the tail is relatively high, causing thermal pollution, does not comply with the environmental requirements. <br> <br> Project by the Beijing Municipal Commission of .science and technology, Tsinghua and Peking Qingyuan century technology co., Ltd. jointly developed QYHP series of high-temperature water source heat pump unit, using the newly developed high temperature refrigerants HTR01, solves the traditional refrigerant pressure-temperature conditions excessive technical bottlenecks, .to ensure that the device is running under high temperature conditions may be of safety *, fundamentally resolve the geothermal heating in the three main issues. <br> <br> QYHP series high-temperature water-source heat pump can directly take 30-60 .° c, low temperature geothermal water heated to 70-90 ° c, suitable for various kinds of heating way, solving the Alpine region of geothermal heat pump for heating and hot water heat pump to replace coal-fired boilers can use radiator water-heating .circulation system of heating renovation. Use of geothermal water temperature minimum tailwater may be lower than 10 ° c, in line with the environmental requirements. Heating condition COP can reach 3.5 above, that is to say, take a price, you can get 3.5 times .more heat. <br> <br> High temperature water source heat pump unit on low temperature geothermal for waste heat recovery, you can increase the heating capacity of geothermal wells, make a mouth geothermal well played two roles of geothermal wells, can produce a .good economic benefit. Cite the case of Beijing: Beijing xiaotangshan region have and geothermal heating engineering 16 and annual extraction using geothermal water 285.9 million cubic metres, the heating area is about 38 000 square meters, if using heat pump technology will be 40 ¡ .æ tail water down to 10 ° c and then discharged from the current annual emissions of 286 million cubic meters of geothermal heat tailrace in recyclable 3.5 million kilowatts, expanding the heating area of 90 square meters, energy saving and environmental benefits are clear. <br .> <br> 2. project description <br> <br> A project in Beijing: a period building 19000 square-student apartments, public about 4200 square (Club), students' apartment with radiator heating hot water-heating circulation system, the .Club takes the Central conditioning system, both winter and summer. Existing geothermal well a mouthful: well depth to 3800 m, may yield to 1054t / d (44t / h), the water temperature is 57 degrees centigrade. <br> <br> .The wells are out of 57 degrees centigrade of low temperature geothermal water directly to the use of air conditioning system of Club heating. The low temperature geothermal water to use for College apartment radiator water-loop heat heating system, heating, you will need to be .further increased to 70 ° c water temperature. If using the traditional coal-fired, oil, gas-fired boiler for heating, heating water temperature remains after emissions will be in more than 40 ° c, could not solve the waste of resources and environmental .heat pollution. <br> <br> Application of high temperature QYHP series, water source heat pump unit can output 70 ℃ above second hot water, to end users for radiator heating system. Use of geothermal water temperature minimum tailwater may be lower than 10 .° c, low temperature geothermal energy while taking full advantage of the heat pump can also be free to produce domestic hot water and for Club provides summer cooling. Truly a multi-purpose, economic and environmental protection, energy-efficient. <br> 3 .. load calculation <br> <br> 1, air conditioning, outdoor design parameters <br> <br> 2, indoor calculation parameters <br> <br> Winter indoor design temperature t = 18-22 ° c, the indoor relative humidity .≤ 55% φ <br> <br> Summer interior design temperature t = 22-26 ° c, indoor relative humidity ≤ 60% φ <br> <br> 3, design related specifications <br> <br> The heating, ventilation .and air conditioning design code GBJ19-87 <br> <br> The building ventilation design fire protection standard "GBJ16-83 <br> <br> The indoor air conditioning and comfortable temperature, GB5701-83 <br> <br> The Office .building design code JG67-89 <br> <br> 4, load calculation <br> <br> · Winter heating condition: <br> <br> Take the area of heat index: q = 60W/m2. <br> < .b> </ b> R> heating total area: F = 23200 square meters <br> <br> Which College apartment 1140kW heat load: <br> <br> Club thermal load: 252kW <br> <br> · Summer cooling condition .: <br> <br> Take the area cooled index: q = 110W / © o <br> <br> Refrigeration and the total building area: F = 4200 M2 <br> <br> The summer total cooling load: Q = .q × F = 110 × 4200 = 462kW <br> <br> IV. technology programme <br> <br> In winter: the use of 57 degrees centigrade to geothermal heating, using cascade use manner. <br> <br> First .level: the application of heat exchanger 55 ℃ hot water output upscale apartment part of heating, hot water temperature dropped to around 52 degrees centigrade; geothermal direct use may provide 256KW thermal that meets the Club's winter heating 252kW maximum thermal load requirements. <br> .<br> Level 2: apply 1 QYHP600H high temperature water source heat pump unit on 52 degrees centigrade hot tail water for waste heat recovery, output 75 ¡æ second water on College apartment for heating. <br> <br> Level three: apply .1 QYHP600H high temperature water source heat pump unit on 36 ℃ or so of geothermal heat recovery tail water conducting, output 75 ¡æ second water on College apartment for heating, hot water temperature 18 ° c, in compliance with the emission standards. <br .> <br> Two QYHP600H high temperature water source heat pump unit can output 1248KW heat to meet students' apartment winter heating 1140kW maximum thermal load requirements. <br> <br> Summertime: QYHP600H-type high-temperature water-source heat pump unit .rated power as 325KW, two total 650KW, can meet the high quality building 4200 M2 total 462KW summer cooling load requirements. <br> <br> 5. process diagrams see figure (brief) <br> <br> 6. economic comparison < .br> High-temperature water-source heat pump in addition to the characteristics of environmental protection, energy saving advantages are clear, following the use of waste heat resources using high temperature water source heat pump heating with the existing variety of heating is running costs, .one-time investment based on a comparison of the underlying data for analysis are as follows: <br> <br> Description: 1, price $ 0.5 / (KW.h), low price of $ 0.2 / (KW.h), .daily 8-hour running low electricity, natural gas prices 1.8/m3, coal price $ 300 $ / t, water 3.2 / t, fuel 3.4 / L. <br> <br> Unit 2, building area of heat load: equipment selection .according to 60W/m2, the actual run press calculate 31.82W / m (System 24 hour uninterrupted run of annual average) 3. Heating system run by 130 days / year. <br> <br> 3, fuel combustion value according to the .national standard gauge, coal-fired boiler efficiency η through 0.55, gas-fired boiler efficiency η through 0.90, oil-fired boiler efficiency η through 0.90, electric boiler efficiency η through 0.95, water source heat pump unit COP = 3.75. <br> .<br> 4. running costs only main equipment of fuel costs, not included in the management fee, coal-fired boiler maintenance fees, etc. <br> <br> 5, in a one-time investment and operating costs in the same .way as the various heating part do the comparison. <br> <br> Through the previous table we can see that the application of high temperature water-source heat pump of the lowest operating costs, and coal-fired boiler is still a huge potential .benefit: boiler maintenance personnel reduction, saving labour costs; there is no cost for boiler overhaul; dispense coal yard occupies ash field in occupies space costs, slag costs; the destruction of the landscape of boiler room, boiler flue gas production of environmental pollutants and .environmental benefits. <br> <br> 7. programme features: <br> <br> 1, waste heat utilization, energy efficiency <br> <br> Using high-temperature water source heat pump unit can be recycled directly using low temperature .geothermal water, geothermal water, oil and other various temperature in 30-60 ¡æ of low-grade heat resources, fundamentally solves such heat resources cannot be heat pump unit status directly recycled. Unit heating condition water temperature according to user needs, the water .temperature can reach up to 90 ° c, could meet the needs of different users of air-conditioning, heating, domestic hot water preparation, low temperature and high temperature water-source heat pump hot water + replace coal-fired boiler for heating in winter .heating without modification and existing heating network at the end, so that existing resources are the most reasonable utilization. <br> <br> 2, the Green environmental protection, benefits significantly <br> <br> Using geothermal water and hot water heat pump .to replace coal-fired boilers can achieve good environmental effects and economic effects, avoids residue gas-fired boilers of the surrounding environment pollution, save the burning?? Transport costs, etc. While addressing the low temperature geothermal water or geothermal tail water emissions on .the environment caused by thermal pollution, through this programme, the geothermal water temperature only 18 ℃ or so far below the national standard of less than 30 degrees centigrade. <br> <br> 3, multi-purpose a machine, save money <br .> <br> In this project, using hot water heat pump for heating in winter, it can also provide summer cooling, thus avoiding the duplication of central air conditioning system. <br> <br> 4, performance, stability and security available * .<br> <br> Water source heat pump operation with a high degree of automation, operating personnel, no pressure container exists, security is good. Groundwater temperature stability, water source heat pump for continuous heating temperature constant, human comfort. <br>.