Abstract By introducing the split water source heat pump air conditioning units and other central air conditioning system in the project cost, operating energy consumption analysis and comparison, the air conditioning engineering design should choose which air conditioning method is more energy-saving Keywords Split water source heat pump Energy saving and environmental protection The economic analysis of the wall split- water source heat pump unit Summary Abstract: Through introduction of the wall split water source heat pump unit and the comparison of the analysis of the cost of the project, energy consuming, which air Keyword: wall split water source heat pump / energy saving and environmental protection / Cost of the project / operating energy consumption Introduction: Modern buildings are widely used central air conditioning system for air conditioning , While air-conditioning energy consumption accounts for more than 60% of the total building energy consumption. With the continuous increase of modern buildings in urban construction, the proportion of air-conditioning energy consumption in urban energy consumption is also on the rise. Air-conditioning power has become a big consumer of power in China. As air conditioners have the characteristics of concentrated use time and large seasonal load, they also aggravate the contradiction between peak and valley power disparities, deteriorating the load characteristics of the power system and reducing the load factor of the power grid, resulting in power facilities The waste of resources. According to the current electricity situation, only by improving the energy efficiency of central air-conditioning and reducing system energy consumption can improve the domestic power load characteristics and reduce the proportion of sharp front load, to achieve the purpose of energy-saving safe power. Split water source heat pump unit is a new energy-efficient environmentally friendly air conditioners that can be widely used in office buildings, hotels, guesthouses, apartment buildings, karaoke OK rooms and other places, commercial premises. Split water source heat pump unit Description: Split water source heat pump unit is between the air-cooled split air conditioners and water-cooled overall air-conditioning between a new type of air conditioning, through the refrigerant as a cooling medium, water as a cold (heat) source, (Hot) sources Cooling tower cooling water (boiler hot water), surface water and even geothermal (soil heat) can be applied. The water temperature of such a continuous circulation system generally needs to be maintained between 15 and 35 ° C. When the circulating water temperature is lower than 15 ° C., the heating can be performed by means of a heating device. When the circulating water temperature is higher than 35 ° C., the cooling tower is used for cooling In order to maintain normal operation. Indoor air supply can either side of the air supply, but also take the air duct system, cold and hot air through independent air duct system to indoor indoors, back air through the door gap, auxiliary room and walkway back to the unit; Duct returned to the unit. Split water source heat pump unit has the following characteristics: 1, energy-efficient use of water as cooling and cooling medium, so the unit of energy efficiency is relatively high, energy efficient and save operating costs. 2, the project investment cycle is short, flexible investment, low cost with the needs of users, installment investment, the initial investment cost is lower. Water pipes without insulation, reduce investment costs, while the traditional central air conditioning can completely solve the problem of dripping water piping system. 3, the unit is small, easy to install, flexible split water source heat pump unit is divided into internal and external machine two parts, the internal structure is similar to the concealed direct cooling fan coil; the main structure of the external compressor, condenser , Four-way raft and other refrigeration, heating components, called "outside machine", in fact, generally installed in the room. The compressor, condenser and other separate from the supply coil, on the one hand to reduce the size of the unit, so that the inner height of less than 250 mm, the outer height of less than 500 mm, easy to hide installation, saving space and improve the installation Flexible; According to the decoration needs, fully cooperate decorating design for installation. On the other hand to reduce the noise in the room, the machine can be installed in the corridors, toilets, kitchen ceiling, balcony and other locations to avoid the noise impact indoor; economic analysis of split water source heat pump unit Following several major types of large central air conditioning The initial investment, long-term operating costs, and energy saving, and other performance, for a simple comparison. First, the initial investment cost comparison: central air conditioning configuration programs include the following types: (A) water cooled central air conditioning unit (B) air cooled central air conditioning unit (C) split water source heat pump air conditioning unit Second, the operation of energy and long-term Operating cost analysis Large central air conditioning huge energy consumption has been troubled manufacturers and users of the problem. The energy consumption of cold and heat sources account for the vast majority of energy consumption of central air conditioning system, large central air conditioning and cold and heat sources can only rely on the rational allocation of units to try to meet the energy requirements under different load conditions, and when the air conditioning load fluctuation range Large or does not meet the design estimation conditions, the energy-saving effect is not good. Large-scale air-cooled, water-cooled central air conditioning unit without the use of other energy-saving measures, long-term operation at full capacity under the high cost of electricity, a great waste of energy. Each air-conditioning system at full capacity compared to the estimated energy consumption Name of the project water-cooled cold water central air conditioning unit air-cooled chilled water central air conditioning unit split water source heat pump air conditioning unit project cost (yuan / kw) 1450 ~ 1500 1800 ~ 2000 1500 ~ 1600 energy consumption ratio (KW / kW) 4.1 ~ 4.6 2.6 ~ 3.2 3.2 ~ 4.0 Cooling energy consumption (kW / RT) 0.85 ~ 0.75 1.35 ~ 1.1 1.1 ~ 0.88 Cooling tower energy consumption (kW / RT) 0.05 / 0.05 Cooling water pump energy consumption (kW / RT) 0.1 / Energy consumption of chilled water pump (kW / RT) 0.1 0.1 Energy consumption of indoor end (kW / RT) 0.15 0.15 0.1 Total energy consumption (kW / RT) 1.25 ~ 1.15 1.6 ~ 1.35 1.25 ~ 1.03 Basic electricity price / Degree) 0.8 0.8 Annual energy consumption (million) 24.9 ~ 22.9 31.9 ~ 26.9 24.9 ~ 20.5 Notes: 1) The annual energy consumption is calculated on the basis of 2000 square meters of air-conditioning area, taking 150W / m2, calculated according to 8 hours per day; Engineering operation records, split water source heat pump energy consumption is only equivalent to 7/10 times the energy consumption of water-cooled, equivalent to air-cooled heat pump energy 6/10 times, heating is equivalent to electric heating energy consumption 3/10 times 2) The initial investment is the project cost, including equipment costs and installation costs Major equipment including air-conditioning host, the end Equipment, cooling towers, cooling water pumps, chilled water pumps, etc.; installation comprises a cooling water, chilled water delivery pipe, equipment, installation costs related accessories and construction labor costs. 3) For the convenience of comparison, the above data are the power consumption under the maximum usage load, without considering the energy-saving capability of the split water source heat pump air conditioner under the condition of unsatisfactory load. 4) large central air conditioning unit did not consider the tube loss and empty consumption. In actual use, due to long-distance cooling water pipeline transportation loss energy, and in the use of load changes caused by excessive power consumption caused by the host more space loss, pipe loss and empty consumption can generally account for more than 15% of full load. Third, the split water source heat pump units compared with other forms of central air conditioning, with more operational flexibility: 1) flexible mode of operation in the transition season to achieve different space unit cooling and heating at the same time, saving energy consumption during the transition season; 2) Split water source heat pump unit will be air-conditioned cold and heat source dispersed to each room, so that the total operating power of air conditioning and the actual needs of the cold load to match exactly to avoid the large centralized cold and heat source central air conditioning ubiquitous waste of space consumption. Cooling water pipeline does not need insulation, not only reduce the initial investment, but also eliminates the chilled water during transport "pipe damage" and reduce energy waste. (According to the experiment of Shenzhen Academy of Building Research, the loss of cooling capacity per kilometer in the transportation of chilled water is about 10%) 3) Compared with the air-cooled unit, the split water source heat pump unit adopts the water-cooling method to improve the unit energy efficiency ratio, Reduce the actual operation of energy consumption; 4) to facilitate and ground temperature, cold storage and other energy-saving measures to further reduce energy consumption and reduce operating costs; 5) for intelligent remote control. Convenient billing, convenient independent control of households, separate billing, no need to install expensive heat meter; 6) The air conditioning unit independent, maintenance or overhaul does not affect the normal operation of other units; 7) The equipment can be purchased in installments , You can only install the cooling water system, the air conditioning unit in the later purchase as needed to reduce the investment pressure; 8) The cooling water system is simple and reliable, low maintenance management technical requirements, as long as the general technical staff to maintain and reduce personnel management and maintenance Summary: After the comparison of the initial investment and long-term operating cost of major systems of central air conditioners, we can get the following conclusions: 1) Initial investment of split-source heat pump air conditioning is slightly higher than that of water-cooled centralized central air conditioning units by about 3% -6% ), Lower than that of air-cooled and chilled water central air-conditioners; 2) However, the split-source heat pump air-conditioners save about 10-30% of the energy consumption of centralized central air-conditioning units. Considering the savings in space consumption and tube losses under less than normal load operation, In the transitional season to save energy, save long-term operating costs more pronounced effect. 3) The efficiency of split-source heat pump air-conditioning units is increased, resulting in a slight increase in costs. However, from the energy-saving effect of energy-efficiency improvement, the benefits of energy-saving will exceed the added value of costs and reduce the demand for electricity and save power resources Greater than loss, benefit outweighs the disadvantages. Pan Yaping (1968 ~), male and master degree, engaged in the research and promotion of the central air conditioner market Liang Jiemin (1974 ~), male and female, vice minister of engineering and technology References: [1] Zhao Yirong and other air-conditioning China Building Industry Press [2 ] "Civil building energy-saving design standards (heating residential buildings)" JGJ26-95.1995
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