Hot Water Absorption Chiller

General Description:

The hot water type LiBr absorption chiller is a hot water powered refrigeration unit. It adopts the aqueous solution of lithium bromide (LiBr) as a cycling working medium. The LiBr solution works as an absorbent and water as a refrigerant.

The chiller comprises primarily the generator, condenser, evaporator, absorber, heat exchanger, auto purge device, vacuum pump and canned pump.

Working principle: The refrigerant water in the evaporator evaporates away from the surface of the heat conducting tube. As heat in the chilled water is taken away from the tube, the water temperature drops and cooling is generated. The refrigerant vapor evaporated from the evaporator is absorbed by the concentrated solution in absorber and therefore the solution is diluted. The diluted solution in absorber is then delivered by the solution pump to the heat exchanger, where the solution is heated and the solution temperature rises. Then the diluted solution is delivered to the generator, where it is heated by hot water to produce refrigerant vapor. Then the solution becomes a concentrated solution. After releasing heat in the heat exchanger, the temperature of the concentrated solution drops. The concentrated solution then enters the absorber, where it absorbs the refrigerant vapor from the evaporator, becomes a diluted solution and enters the next cycle.
The refrigerant vapor generated by the generator is cooled in the condenser and become refrigerant water, which is further depressurized by throttle valve or U-type tube and delivered to the evaporator. After the evaporation & refrigeration process, the refrigerant vapor enters the next cycle.

The aforesaid cycle occurs repeatedly to form a continuous refrigeration process.

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Chiller Features

1.Interlock mechanical & electrical anti-freezing system: multi anti-freezing protection
The coordinated anti-freezing system features following merits: a lowered primary sprayer design for the evaporator, an interlock mechanism which links the secondary sprayer of evaporator with the supply of chilled water and cooling water, a pipe blockage prevention device, a two-hierachy chilled water flow switch, an interlock mechanism designed for the chilled water pump and cooling water pump. Six levels anti freezing design ensures timely detection of break, underflow, low temperature of chilled water, automatic actions will be taken to prevent tube freezing.

2.Auto purge system combining muti-ejector&fall-head technology: speedy vacuum purging and high vacuum degree maintenance
This is a new, high efficiency automatic air purge system. The ejector functions as a small air extraction pump. DEEPBLUE automatic air purge system adopts multiple ejectors to increase the air extraction and purge rate of chiller. Water head design can help to evaluate vacuum limits and maintain a high vacuum degree. The design with features rapidly and highness can provide a high vacuum degree for every part of chiller at any time. Therefore, oxygen corrosion is precluded, service life time is prolonged and optimal operating status is maintained for chiller.

3.Simple and reliable system pipe design: easy operation and reliable quality
Maintainable structure design: spray plate in absorber and spray nozzle in evaporator are replaceable. Ensure capacity will not drop in lifespan. No solution regulation valve, refrigerant spray valve and high pressure refrigerant valve, so the leakage points are less, and unit can keep stable operation without manual regulation.

4.Automatic anti-crystallization system combining potential difference-based dilution and crystal dissolution: eliminate crystallization
A self-contained temperature & potential difference detection system enables chiller to monitor excessively high concentration of the concentrated solution. On one hand upon detecting an overly high concentration the chiller automatically feeds refrigerant water to concentrated solution for dilution, on the other hand, the chiller utilizes HT LiBr solution in generator to heat concentrated solution to a higher temperature. In the event of a sudden power failure or abnormal shutdown, potential difference-based dilution system will start rapidly to dilute LiBr solution and to ensure rapid dilution after power supply recovers.

5.Tube broken alarm device
When the heat exchange tubes broke in hot water absorption chiller at abnormal condition, control system send out an alarm to remind operator to take actions, reduce damage.

6.Self-adaptive refrigerant storage unit: improving part load performance and shortening startup/shutdown time.
The refrigerant water storage capacity can be automatically adjusted according to external load changes, particularly when the hot water absorption chiller works under partial load. The adoption of refrigerant storage device can shorten startup/shutdown time substantially and reduce idle work.

7.Economizer: energy output boosting
Isooctanol with a conventional chemical structure as an energy boosting agent added to LiBr solution, is normally an insoluble chemical that has only a limited energy boosting effect. The economizer can prepare mixture of isooctanol and LiBr solution in a special way to guide isooctanol into generation and absorption process, therefore enhancing energy boosting effect, effectively reducing energy consumption and realizing energy efficiency.

8.Integral sintered sight glass: a powerful guarantee for high vacuum performance
The leakage rate of the whole unit is lower than 2.03X10-9 Pa.m3 /S , Which is 3 grade higher than national standard, can ensure unit's lifespan.
Unique surface treatment for heat exchange tubes: high performance in heat exchanging & less energy consumption
The evaporator and absorber have been hydrophilic treated to ensure even liquid film distribution on tube surface. This design can improve heat exchange effect and lower energy consumption.

9.Li2MoO4 Corrosion inhibitor: an environment –friendly corrosion inhibitor
Lithium Molybate (Li2MoO4), an environment-friendly corrosion inhibitor, is used to replace Li2CrO4 (Containing heavy metals) during the preparation of LiBr solution.

10.Frequency control operation: an energy-saving technology
Chiller can adjust its operation automatically and maintain optimal working according to different cooling load.

11.Plate heat exchanger: saving more than 10% energy
A stainless corrugated steel plate heat exchanger is adopted. This type of plate heat exchanger has a very sound effect, a high heat recovery rate and remarkable energy saving performance. Meanwhile, the stainless steel plate has a service life of over 20 years.

Artificial Intelligent Control System AI (V5.0)

1.Fully-automatic control functions
The control system (AI, V5.0) is featured by powerful and complete functions, such as one-key start up/ shutdown, timing on/off, mature safety protection system, multiple automatic adjustment, system interlock, expert system, human machine dialogue(multi languages), building automation interfaces, etc.

2.Complete chiller abnormality self-diagnosis and protection function.
The control system (AI, V5.0) features 34 abnormality self-diagnosis & protection functions. Automatic steps will be taken by system according to level of an abnormality. This is intended to prevent accidents, minimize human labor and ensures a sustained, safe and stable operation of hot water absorption chiller.

3.Unique load adjustment function
The control system (AI, V5.0) has a unique load adjustment function, which enables automatic adjustment of hot water absorption chiller output according to actual load. This function not only helps to reduce startup/shutdown time and dilution time, but also contributes to less idle work and energy consumption.

4.Unique solution circulation volume control technology
The control system (AI, V5.0) employs an innovative ternary control technology to adjust circulated solution volume. Traditionally, only parameters of generator liquid level are used to control of solution circulation volume. This new technology combines merits of concentration & temperature of concentrated solution and liquid level in generator. Meanwhile, an advanced frequency–variable control technology is applied to solution pump to enable chiller to achieve an optimal circulated solution volume. This technology improves operating efficiency and reduces start-up time and energy consumption.

5.Cooling water temperature control technology
The control system (AI, V5.0) can control and adapt heat source input according to cooling water inlet temperature changes. By maintaining cooling water inlet temperature within 15-34 ℃, chiller operate safely and efficiently.

6.Solution concentration control technology
The control system (AI, V5.0) uses a unique concentration control technology to enable real-time monitoring/control of concentration and volume of concentrated solution as well as heat source input. This system can maintain chiller under safe and stable at high concentration condition, improve chiller operating efficiency and prevent crystallization.

7.Intelligent automatic air extraction function
The control system (AI, V5.0) can realize real-time monitoring of vacuum condition and purge out the non-condensable air automatically.

8.Unique dilution stop control
This control system (AI, V5.0) can control operation time of different pumps required for dilution operation, according to concentrated solution concentration, ambient temperature and remaining refrigerant water volume. Therefore, an optimal concentration can be maintained for the chiller after shutdown. Crystallization is precluded and chiller re-start time is shortened.

9.Working parameter management system
Through interface of this control system (AI, V5.0), operator can perform any of following operations for 12 critical parameters relating to chiller performance: real-time display, correction, setting. Records can be kept for historical operation events.

10.Chiller fault management system
If any prompt of occasional fault is displayed on operation interface, this control system(AI, V5.0) can locate and detail fault, propose a solution or trouble shooting guidance. Classification and statistical analyses of historical faults can be conducted to facilitate maintenance service provided by operator

11.Remote Operation & Maintenance System
Deepblue Remote Monitoring Center collects the data of the units distributed by Deepblue around the world. Through the classification, statistics, and analysis of real-time data, it displays in the form of reports, curves, and histograms to achieve an overall overview of equipment operating status and fault information control. Through a series of collection, calculation , control, alarm, early warning, equipment ledger, equipment operation and maintenance information and other functions, as well as customized special analysis and display functions, the remote operation, maintenance, and management needs of the unit are finally realized. The authorized client can browse the WEB or APP, which is convenient and fast.

Nominal Parameter

Single Stage Hot Water Absorption Chiller Parameter

Model		RXZ(95/85)-	35	58	93	116	145	174	233	291	349	465	582	698	756
Cooling capacity		kW	350	580	930	1160	1450	1740	2330	2910	3490	4650	5820	6980	7560
		10⁴kCal/h	30	50	80	100	125	150	200	250	300	400	500	600	650
		USRT	99	165	265	331	413	496	661	827	992	1323	1653	1984	2152
Chilled water	Inlet/outlet temp.	℃	12→7
	Flow rate	m³/h	60	100	160	200	250	300	400	500	600	800	1000	1200	1300
	Pressure drop	kPa	70	80	80	90	90	80	80	80	60	60	70	80	80
	Joint connection	DN(mm)	100	125	150	150	200	250	250	250	250	300	350	400	400
Cooling water	Inlet/outlet temp.	℃	32→38
	Flow rate	m³/h	113	188	300	375	469	563	750	938	1125	1500	1875	2250	2438
	Pressure drop	kPa	65	70	70	75	75	80	80	80	70	70	80	80	80
	Joint connection	DN(mm)	125	150	200	250	250	300	350	350	350	400	450	500	500
Hot water	Inlet/outlet temp.	℃	95→85
	Flow rate	m³/h	38	63	100	125	156	188	250	313	375	500	625	750	813
	Pressure drop	kPa	76	90	90	90	90	95	95	95	75	75	90	90	90
	Joint connection	DN(mm)	80	100	125	150	150	200	250	250	250	300	300	300	300
Power Demand		kW	2.8	3	3.8	4.2	4.4	5.4	6.4	7.4	7.7	8.7	12.2	14.2	15.2
Dimension	Length	mm	3100	3100	4120	4860	4860	5860	5890	5920	6920	6920	7980	8980	8980
	Width	mm	1400	1450	1500	1580	1710	1710	1930	2080	2080	2850	2920	3350	3420
	Height	mm	2340	2450	2810	2980	3180	3180	3490	3690	3720	3850	3940	4050	4210
Operation weight		t	6.3	8.4	11.1	14	17	18.9	26.6	31.8	40	46.2	58.2	65	70.2
Shipment weight		t	5.2	7.1	9.3	11.5	14.2	15.6	20.8	24.9	27.2	38.6	47.8	55.4	59.8
Cooling water inlet temp. range:15℃-34℃, minimum chilled water outlet temp. -2℃. Cooling capacity regulation range 10%～100%. Chilled water, cooling water and hot water fouling factor:0.086m2•K/kW. Chilled water, cooling water and hot water maximum working pressure:0.8MPa. Power type: 3Ph/380V/50Hz (or customized). Chilled water flow adjustable range 60%-120%, cooling water flow adjustable range 50%-120% Hope Deepblue reserves the right of interpretation,the parameters maybe amended at final design.

Double Phase Hot Water Absorption Chiller Parameter

Model		RXZ(120/68)-	35	58	93	116	145	174	233	291	349	465	582	698	756
Cooling capacity		kW	350	580	930	1160	1450	1740	2330	2910	3490	4650	5820	6980	7560
		104 kCal/h	30	50	80	100	125	150	200	250	300	400	500	600	650
		USRT	99	165	265	331	413	496	661	827	992	1323	1653	1984	2152
Chilled water	Inlet/outlet temp.	℃	12→7
	Flow rate	m3/h	60	100	160	200	250	300	400	500	600	800	1000	1200	1300
	Pressure drop	kPa	60	60	70	65	65	65	60	60	60	90	90	120	120
	Joint connection	DN(mm)	100	125	150	150	200	250	250	250	250	300	350	400	400
Cooling water	Inlet/outlet temp.	℃	32→38
	Flow rate	m3/h	113	188	300	375	469	563	750	938	1125	1500	1875	2250	2438
	Pressure drop	kPa	65	70	70	75	75	80	80	80	70	70	80	80	80
	Joint connection	DN(mm)	125	150	200	250	250	300	350	350	350	400	450	500	500
Hot water	Inlet/outlet temp.	℃	120→68
Hot water	Flow rate	m3/h	7	12	19	24	30	36	48	60	72	96	120	144	156
Power Demand		kW	3.9	4.1	5	5.4	6	7	8.4	9.4	9.7	11.7	16.2	17.8	17.8
Dimension	Length	mm	4105	4105	5110	5890	5890	6740	6740	6820	7400	7400	8720	9670	9690
	Width	mm	1775	1890	2180	2244	2370	2560	2610	2680	3220	3400	3510	3590	3680
	Height	mm	2290	2420	2940	3160	3180	3240	3280	3320	3480	3560	3610	3780	3820
Operation weight		t	7.4	9.7	15.2	18.4	21.2	23.8	29.1	38.6	44.2	52.8	69.2	80	85
Shipment weight		t	6.8	8.8	13.8	16.1	18.6	21.2	25.8	34.6	39.2	46.2	58	67	71.2
Cooling water inlet temp. range:15℃-34℃, minimum chilled water outlet temp. 5℃. Cooling capacity regulation range 20%～100%. Chilled water, cooling water and hot water fouling factor:0.086m2•K/kW. Chilled water, cooling water and hot water maximum working pressure:0.8MPa. Power type: 3Ph/380V/50Hz (or customized) Chilled water flow adjustable range 60%-120%, cooling water flow adjustable range 50%-120% Hope Deepblue reserves the right of interpretation,the parameters maybe amended at final design.

Model Selection

Chilled Water Outlet Temperature
Besides the specified Chilled water outlet temperature of a standard chiller, other outlet temperature values (min -2℃) may also be selected.

Pressure Bearing Requirements
The design pressure bearing standard capacity of the Chilled water/cooling water system of the chiller is 0.8MPa. If the actual pressure of the water system exceeds this standard value, a HP-type chiller should be used.

Unit QTY
If more than one unit is used, the unit's QTY should be determined by comprehensive consideration of max load, partial load, maintenance period as well as machine room's size.

Control Mode
The Hot water absorption chiller is supported by an Al (artificial intelligence) control system that enables automatic operation. Meanwhile, there are a number of options available for the customers, such as control interfaces for the Chilled water pump, cooling water pump, cooling tower fan & buildings, centralized control system and internet access.

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