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the driving heat flow at intermediate temperature level will be split in the revalued heat flow at high temperature level and in rejected heat flow at low temperature level
scheme of the absorption heat transformer process

Absorption heat transformer

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An absorption heat transformer (AHT) is a device able to split a heat flow at an intermediate temperature level in two heat flows, at a higher (revaluated) temperature level and at a lower temperature level (rejection heat). Such a device is also denominated type II absorption heat pump or booster heat pump. Absorption heat transformers are especially suitable for heat recovery from industrial processes, its main advantage being the capacity to upgrade to a usable level the temperature of waste heat streams using only negligible quantities of electrical energy and no additional primary energy. [1] The definition of the thermal coefficient of performance is

Single effect heat transformers can increase the temperature of approximately 50% of the waste energy by approximately 50 K (depending on the boundary conditions). Single effect heat transformer is effectively a single effect absorption chiller working in reverse. It consists primarily of one condenser, one evaporator one absorber and one generator. The difference with absorption chiller is that the absorber and evaporator now operate at high pressure and the condenser and generator at low pressure. The most common working pairs are water/lithium bromide (refrigerant = water, absorbent = LiBr) and ammonia/water (refrigerant = ammonia, absorbent = water).

Process

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In general an absorption heat transformer consists out of the absorber, generator, evaporator and condenser. In addition there are a refrigerant pump, solution pump, solution throttle and mostly included a solution heat exchanger to improve the efficiency. This process description applies to single stage absorption heat transformers using the working pair water/lithium bromide. At the evaporator the refrigerant evaporates driven by the heat flow at intermediated temperature level. The absorbent in the absorber absorbs the refrigerant vapour, while producing heat at high temperature level. This heat is the useful heat. Furthermore the absorbent is diluted while absorbing the refrigerant vapour. That diluted absorbent streams through the throttle in the generator. In the generator the absorbent desorbs the refrigerant also driven by the heat flow at intermediated temperature level. The refrigerant vapour is condensed in the condenser before the liquid refrigerant is pumped by the refrigerant pump into the evaporator. The concentrated absorbent is pump in to the absorber with the solution pump. The occurring heat at the condensore is mostly rejected to the ambient. More detailed information about absorption heat transformer and also absorption devices in general are given here. [2]

Applications

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This table shows absorption heat transformer applications in industrial processes. Next to the industrial applications there are some absorption heat transformers in research laboratories [3] [1].

place branch capacity working pair temperature levels COP working periode manufacturer source
Izmir, Turkey Chemistry industry 200 kW LiBr/H20 ? ? commissioning 2019 BSNova [4]
Japan Distillation plant 2.475 MW ? 25°C;30.5/78°C;78/107;112°C 0.45 2008-? Hitachi [5]
Japan Machinery 150 kW ? 27;32/ 90°C;85/ 133;137°C 0.484 2007-? Hitachi [5]
China chemical industry (rubber) 5 MW ? 28;30°C/98°C;-/-;110°C 0.47 ca. 2002 - ? ? [6]
Netherlands ? 6.78 MW H2O/LiBr -;-/-;100°C; /-;150°C ? ca. 1988 - ? Delamine [7]
Yugoslavia Animal carcass 1.1 MW ? -;-/-;100°C/ -;144°C ? 1986 - ? GEA [8]
Stuttgart, Germany Food industry (Brewery) 1.4 MW ? -;-/-;100°C/ -;136°C ? 1986 - ≥1995 GEA [8]
Tokuyama, Japan chemical industry (rubber) 1.09 MW ? 27;30°C / 125;91°C / 134;139°C 0.49 1985 - ? Sanyo [8]
Fuji, Japan ? 2.706 MW ? 32;37°C/ -;95°C/ 25;131°C 0.47 1985 - ? Hitachi Zosen [8]
Siu-Nanyo, Japan chemical industry (rubber) 1.88 MW ? 31;37°C / 100;100°C / 90;143°C 0.49 1985 - ? Hitachi Zosen [8]
Amaki, Japan ? 0.35 MW ? 32;37°C/ 95;85°C/ 95;120°C 0.49 1984 - ? Hitachi Zosen [8]
Delfzijl, Netherlands chemical industry (Ethyle amines) 6.78 MW ? 10.7;36.3°C/ -;103,3°C/ 130.8;144.9°C ? 1984 - ≥1995 Hitachi Zosen [8]
Niigata, Japan ? 1.67 MW ? 15;20°C / 80;80°C / 111;116°C 0.48 1984 - ? Sanyo [8]
Kagoshima, Japan chemical industry (Ethylalcohol) 0.93 MW ? 20;30°C / 80;80°C / 119;124°C 0.48 1984 - ? Sanyo [8]
Dörnten, Germany Animal carcass 1 MW H2O/LiBr ? /-;-/-;100°C; /-;145°C ? 1984 - ? GEA; Kawasaki Heavy Industries, Japan [7] , [8]
Grefenbroich, Germany Food industry (Buckau Wolf); research 50 kW NH3/H2O -;-/80°C;-/ -;120°C ca. 0.4 around 1984 Krup-Industries; TU Stuttgart [7]
Korea ? 2.35 MW ? 31°C;- / 98;88°C / 127;132°C 0.48 1983 - ? Sanyo [8]
Shimonoseki, Japan chemical industry 1.66 MW ? 28;32°C / 83;83°C / 100;111°C 0.48 1983 - ? Sanyo [8]
Tokai, Japan chemical industry (Butadiene) 1.88 MW ? 32;36°C / 80,5;80,5°C / 100/112°C 0.48 1983 - ? Hitachi Zosen [8]
Chiba, Japan chemical industry (Butadiene) 2.35 MW ? 26;32°C / 98;88°C / 127;133°C 0.47 1981 - ? Sanyo [8]
Wesseling, Germany chemical industry 2 MW ? -;-/97;94.5/ -;133 ? ? - ≥1995 GEA [8]
Canada paper industry (drying) 11 to 21 MW (depends on temperature boost) Water/ Natriumhydroxid ? ? ? ? [7]


References

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  1. ^ a b Cudok, F.; Corrales Ciganda, J. L; Kononenko, N.; Drescher, E. (2017). "Experimental results of an absorption heat transformer". Proceedings of 12th IEA Heat Pump Conference.
  2. ^ Herold, Keith E; Radermacher, R.; Klein, S A (1996). Absorption Chillers and Heat Pumps. CRC Press. ISBN 978-0849394270.
  3. ^ Parham, Kiyan; Khamooshi, Mehrdad; Tematio, Daniel Boris Kenfack; Yari, Mortaza; Atikol, Uğur (June 2014). "Absorption heat transformers – A comprehensive review". Renewable and Sustainable Energy Reviews. 34: 430–452. doi:10.1016/j.rser.2014.03.036.
  4. ^ "Indus3Es – Industrial Energy and Environment Efficiency". Retrieved 27 November 2018.
  5. ^ a b Fujii, Tatsuo; Akira, Nishiguchi; Shuuichiro, Uchida (2010). "DEVELOPMENT ACTIVITIES OF LOW TEMPERATURE WASTE HEAT RECOVERY APPLIANCES USING ABSORPTION HEAT PUMPS". Proceedings of International Symposium on Next-generation Air Conditioning and Refrigeration Technology10, Tokyo, Japan. Japan.
  6. ^ Ma, Xuehu; Chen, Jiabin; Li, ongping; Sha, Qingyun; Liang, Aiming; Li, Wei; Zhang, Jiayan; Zheng, Guojun; Feng, Zhihao (2003). "Application of absorption heat transformer to recover waste heat from a synthetic rubber plant". Applied Thermal Engineering. 7 (23): 797-806. doi:10.1016/S1359-4311(03)00011-5.
  7. ^ a b c d Stephan, K. "Der Wärmetransformator - Grundlagen und Anwendungen". Chemie Ingenieur Technik 60: 335–348.
  8. ^ a b c d e f g h i j k l m n o Industrial heat pumps. EA Heat Pump Centre. 1995. p. 63-65.