Comparison between the hottest lithium bromide abs

Comparison between lithium bromide absorption chiller and electric refrigeration air conditioning unit

--- from page P of the proceedings of the national HVAC refrigeration academic annual meeting 1996

a comparative study of lithium bromide absorption chiller and other chillers is carried out. It is believed that in the design of large centralized central air conditioning in some specific occasions (such as high temperature environment), the advantages of choosing lithium bromide absorption chiller are greater than the disadvantages; Under the existing conditions, such as the cancellation of power capacity increase fees, the improvement of CNC processing technology of screw compressors, the maturity of screw machine energy regulation technology and the provision of advanced automatic control technology, the advantages of its screw unit have emerged. Its screw unit is gradually replacing the lithium bromide absorption chiller, and some lithium bromide absorption chiller manufacturers are gradually developing The actual situation of popularizing screw unit can be explained. The following will be from the following aspects to improve the efficiency of resource and energy utilization and promote the recyclable steel process technology of emission reduction; Description of eco non blast furnace ironmaking technology:

I. energy consumption analysis of water chillers, such as ozone, bromine, iodine, etc.

1. Selection of water chillers

from the perspective of cycle efficiency: in compression chillers, when screw and centrifugal chillers are high, their energy consumption per unit refrigerating capacity is generally 0.2KW ~ 0.22kw. Their energy-saving units are refrigeration units. The COP value of the actual cycle efficiency of the lithium bromide absorption refrigeration unit is about 1.0 ~ 1.2. (the working conditions are the same: the inlet and outlet temperature of cold water is 2/12, and the inlet and outlet temperature of cooling water is 30/35 ℃)

at present, the investment estimation prices of different refrigerators published internationally. According to the international prices, screw units can be selected for the refrigeration system with a single unit capacity of less than 1400kW gb/t16491 ⑵ 008 "electronic universal energy experimental machine"; For the refrigeration system with a single unit capacity of 2000kW, it is more economical to use centrifugal units; The average price of absorption refrigeration units is about twice that of centrifugal units. The domestic situation is different. With the same unit capacity, the price of lithium bromide absorption refrigeration unit is slightly 1.5 times that of centrifugal unit. If the compressor unit adopts new alternative working medium (such as R134a or R123, etc.), its price will be increased

2. Analysis of energy consumption and primary energy consumption of each unit

among the chillers, people are accustomed to choose centrifugal, screw and lithium bromide absorption chillers

Table 1 lists the models, refrigerating capacity and energy consumption of three types of domestic units with similar refrigerating capacity

Table 1 partial parameters of various refrigeration systems

model and model refrigerating capacity (kw) motor output power (kw) steam consumption (kg/h) auxiliary equipment consumption (kw) manufacturer

lithium bromide absorption refrigeration unit ---15505.5 carrier

screw refrigerator mwf200l-w ------ carrier

note: cooling water inlet temperature is 32 ℃, chilled water outlet temperature is 7 ℃

in order to accurately evaluate the energy-saving effect of the refrigeration unit, We use the primary energy (standard coal) consumed per unit of refrigerating capacity as the standard. Since the vast majority of electric energy in China is produced by thermal power plants, both the steam consumed by absorption chillers and the electricity consumed by compression units can be converted into standard coal consumption

under normal circumstances, China's average coal consumption of electricity is 0.47kg/kWh (taking into account 10% of the transmission loss), and the coal consumption converted into power supply is 0.12kg/kg coal consumption per kilogram of steam. In this way, the coal consumption per unit refrigerating capacity of the above three types of machines can be calculated

as listed in Table 2

Table 2 coal consumption per unit refrigerating capacity of various refrigerators

model lithium bromide absorption refrigerator screw refrigerator

coal consumption of electricity (kg/kw/h) 2.23 ×. 07 ×

steam and coal consumption (kg/kw/h) 1.06 ×---

total 1.62 ×. 07 ×

if the above absorption chillers use a separate boiler to provide steam, the boiler efficiency is considered to be 80%.

it can be seen from the above table that the coal consumption per unit refrigerating capacity of the absorption chiller is 1.5 times that of the screw chiller. Therefore, from the perspective of primary energy consumption, the absorption chiller does not use waste heat for refrigeration, but uses a separate boiler to provide steam. This kind of chiller is completely energy-saving

II. Economic analysis of various refrigerators

the economic analysis of various refrigerators is mainly to compare their initial investment and operating costs under the same conditions. We still take the above three refrigerators as an example to compare. Because the refrigerating capacity of the listed three refrigerators is not exactly the same, in order to correctly evaluate them, We use the cost of unit refrigerating capacity as the measurement standard, and consider the power capacity increase cost in the calculation (single circuit power supply is calculated at 450 yuan/kw, double the double circuit power supply), Then the initial investment of unit refrigerating capacity of each refrigerator is shown in Table 3

Table 3 initial investment of unit refrigerating capacity of various refrigerators

model refrigerating system cost (yuan/kw) electric capacity increase cost (yuan/kw) Total (yuan/kw)

single power supply double power supply single power supply double power supply

absorption refrigerator

screw refrigerator

note: the investment of heating equipment used by each system is temporarily excluded

it can be seen from table 3 that without calculating the investment in the heating system of the absorption refrigerator, the initial investment per unit refrigerating capacity of the absorption refrigerator must be relatively large, about 1.3 times that of the centrifugal type (for single circuit power supply), because of its large metal consumption and complex structure. When calculating the operation cost, we mainly consider the power consumption cost and heating cost of each unit, and ignore some other costs (such as maintenance cost and depreciation cost, etc.) for the time being. Due to the different prices of electricity and coal in various regions, the tentative electricity price is 0.5 yuan/kWh, the price of standard coal is 350 yuan/t, and the price of oil is 2 yuan/L, Suppose that the fuel cost accounts for 75% of the total heating cost. The calculated operating cost per unit refrigerating capacity of each unit is shown in the following table:

Table 4. The unit refrigerating capacity of each type of refrigerator is the operating cost of ICI (acquired by AkzoNobel), DuPont, Solvay, BASF and Hoechst in the United Kingdom, respectively.

model absorption chiller screw chiller

coal-fired fuel oil

electricity cost, yuan/kw Y5.