ZNX Elliptical tube evaporative condenser-Aoxing Refrigeration Equipment Co., Ltd.

ZNX Elliptical tube evaporative condenser

产品介绍

Name： ZNX Elliptical tube evaporative condenser

Sort： Air-cooled condenser

Description：

Principle of elliptical tube evaporative condenser
Evaporative Condenser use water and air as refrigerant, which mainly use the part of water evaporation and air flow taking away the heat by the process of refrigerant gas condensate giving off. Shell is a steel rectangular box, which has condensed tube group, sprinklers, retaining plate, and the catchments disk locate at the bottom, external box equipped with circulation pumps, axial fan are at the top of the box. When Evaporative Condenser works, the cooling water pumps to the nozzle which at the upper part of the condensation tube, uniform spray to condensate pipes in the outer surface, forming a layer of thin water film, high-temperature refrigerant vapor from the upper of the snake-like condensation tube to enter, condensed liquid refrigerant from the lower part of outflow in the snake-like tube on the spray of water to absorb the heat of refrigerant, the evaporation of water vapor into, the rest after the Second time cooling fall into the lower part of the catchments tray for recycling pump. Fan force air through the condensate pipes at 3～5m/s speed, and promote water-film evaporation, and strengthen Condenser exothermic effect. And during endothermic process, the water droplets was cooling in the whereabouts by air. At the same time, cooling water vapor to form droplets of water and make it back down to the bottom plate, so as to reduce water consumption. In addition, the water tray also has a floating ball valve, when the water continuously excessive evaporate, water level set too low, the floating ball valve will automatically open to the cooling water.

Selection of the calculation
Single-stage compressor:
Qn=(Qo+Ne)×ξ
Qn: themrmal exhaust of condenser is KW
Qo=refrigerating capacity KW
Ne=brake power of compressor is KW
ξ:correction factor of thermal exhaust
Selection example of Single-stage compressor:
A refrigeration compressor in the condensing temperature of 40℃, evaporation temperature of 0℃, the refrigeration capacity of 448KW, compressors consume power (brake power) of 106KW, wet bulb temperature of 26℃, Evaporative Condenser with options as follows:
Thermal exhaust Qn=(448+106) ×ξ
According to the calculation results that choose the heat emission of evaporative condenser should be equal to or slightly larger than Qn
double-stage compressor
Qn=Vdp×q1×ξ
Themrmal exhaust of condenser is KW
Low-level theory of displacement (m3/h)
The condensate load of double-stage compressor at different conditions
ξ: correction factor of thermal exhaust

高低压理论排气量之比	蒸发温度℃
高低压理论排气量之比	-28	-30	-33	-35	-40	-45
1:3	0.78	0.72	0.62	0.58	0.48	0.44
1:2	0.83	0.77	0.68	0.62	0.49	0.45

Diagram of elliptical tube evaporative condenser installation and pipe connection

Correction factor table ξ of thermal exhaust
refrigerant R22

冷凝温度℃ Condensing temperature	进风空气湿球温度℃ Inler air wet bulb temperature℃
冷凝温度℃ Condensing temperature	10	12	14	16	18	19	20	21	22	23	24	25	26	28
30	0.94	1.03	1.12	1.25	1.42	1.54	1.68	1.84	2.19	2.35	2.70	3.27
32	0.83	0.91	0.98	1.07	1.20	1.27	1.37	1.47	1.61	1.77	1.96	2.23
34	0.76	0.81	0.86	0.94	0.98	1.08	1.14	1.21	1.31	1.41	1.53	1.68	1.87
35	0.68	0.71	0.75	0.81	0.89	0.91	0.94	0.96	1.08	1.15	1.23	1.32	1.44	1.75
36	0.66	0.69	0.73	0.78	0.84	0.88	0.91	0.96	1.00	1.06	1.12	1.20	1.29	1.56
38	0.61	0.63	0.66	0.70	0.74	0.77	0.80	0.83	0.86	0.91	0.95	1.00	1.07	1.24
40	0.56	0.59	0.60	0.63	0.65	0.69	0.71	0.74	0.76	0.80	0.82	0.87	0.91	1.03
42	0.53	0.54	0.55	0.58	0.61	0.63	0.64	0.66	0.69	0.72	0.74	0.77	0.79	0.88
44	0.49	0.50	0.51	0.53	0.55	0.57	0.58	0.59	0.62	0.64	0.66	0.67	0.71	0.77

refrigerant R717

冷凝温度℃ Condensing temperature	进风空气湿球温度℃ Inler air wet bulb temperature℃
冷凝温度℃ Condensing temperature	10	12	14	16	18	19	20	21	22	23	24	25	26	28
30	0.83	0.94	0.97	1.08	1.20	1.34	1.46	1.51	1.79	2.03	2.33	2.83
32	0.73	0.78	0.85	0.93	1.04	1.11	1.18	1.28	1.39	1.53	1.68	1.92
34	0.66	0.71	0.75	0.85	0.89	0.94	0.98	1.05	1.12	1.22	1.26	1.43	1.60
35	0.61	0.63	0.68	0.72	0.80	0.83	0.85	0.90	0.94	0.97	1.00	1.18	1.29	1.61
36	0.56	0.59	0.63	0.67	0.70	0.75	0.78	0.82	0.84	0.91	0.96	1.00	1.07	1.33
38	0.51	0.54	0.57	0.61	0.65	0.66	0.68	0.71	0.74	0.77	0.82	0.86	0.91	1.03
40	0.48	0.49	0.52	0.54	0.57	0.59	0.61	0.63	0.66	0.68	0.71	0.74	0.82	0.96
42	0.44	0.46	0.47	0.49	0.51	0.53	0.55	0.56	0.58	0.61	0.63	0.65	0.68	0.76
44	0.41	0.42	0.43	0.45	0.47	0.48	0.49	0.51	0.52	0.53	0.55	0.58	0.60	0.65

Technical characteristics of evaporative condenser:
a) the unit using high quality corrosion-resistant materials, supported by pipe, tank, and cabinet, Steel, heat exchanger using hot-dip zinc treatment thickness of zinc layer at 0.08～0.12, Products’ life improve quickly. Panel with 2mm, water tanks made of galvanized plate with 3mm, the surface of the overall painting.
b) Using importing soft rubber as sealing packing for Box joints, sealing effect, high temperature resistant, corrosion-resistant.
c) Using corrosion-resistant PTFE materials for spray pipe and nozzle, the structure adopts large discharge and anti-blockage nozzles, which can ensure the cooling water furthest contact the condensing coil and hence overcome the fouling and promote the moisture to vaporize, thus improve the effect of heat transfer.
d) Water receiver uses tortuous structure, effectively prevent the water flowing (flowing rate≤0.001%), water receiver was installed in the unit, which is easy to installing and demolition.
e) Air receiver can reduce air flow corner and resistance, so as to conduct hot air from the build-up and rapid discharge, which to the best results for the whole system.

Dimensions of elliptical tube evaporative condenser, Parameters of the pump and axial flow (just for refer)

型号model	面积area（m²）	排热量 thermal exhaust（KW）	尺寸size						水泵pump			轴流风机axial flow fan
			A	B	C	H1	H2	H	型号model	功率	流量	数量	风量air	功率
			mm	mm	mm	mm	mm	mm	ISG	KW	m³/h	台	m³/h	KW/台
ZNX-40/180	40	180	1700	1220	300	885	890	2850	65-100A	1.1	22.3	1	18000	1.1
ZNX-50/222	50	222	1700	1530	300	885	890	2850				1	20000	1.5
ZNX-60/265	60	265	2050	1480	300	885	890	2850				1	23000	2.2
ZNX-80/348	80	348	2050	1530	300	885	1155	3100				1	32000	3.0
ZNX-100/435	100	435	3050	1380	350	935	1155	3150	80-100A	2.2	44.7	2	2×20000	2×1.5
ZNX-120/516	120	516	3050	1530	350	935	1155	3150				2	2×23000	2×2.2
ZNX-140/605	140	605	3550	1530	350	985	1155	3200				2	2×32000	2×3.0
ZNX-160/690	160	690	3550	1730	350	985	1155	3200				2	2×32000	2×3.0
ZNX-180/775	180	775	3550	1930	450	985	1155	3200	800-100(1) A	4.0	892	2	2×35000	2×4.0
ZNX-200/860	200	860	4650	1530	450	985	1155	3200				2	2×40000	2×4.0
ZNX-220/946	220	946	4650	1730	450	1035	1155	3250				2	2×45000	2×4.0
ZNX-240/1035	240	1035	4650	1930	450	1035	1155	3250				2	2×45000	2×4.0
ZNX-260/1120	260	1120	4650	2080	450	1035	1155	3250				3	3×32000	3×3.0
ZNX-280/1205	280	1205	4650	2280	450	1035	1155	3250				3	3×35000	3×4.0
ZNX-300/1290	300	1290	5350	2080	450	985	1155	3200	100-100	5.5	100	3	3×40000	3×4.0
ZNX-320/1380	320	1380	5350	2280	450	1035	1155	3250				3	3×40000	3×4.0
ZNX-350/1505	350	1505	5350	2380	450	1035	1155	3250				3	3×45000	3×4.0
ZNX-360/1550	360	1550	5350	2480	450	1085	1155	3300				4	4×35000	4×4.0
ZNX-380/1635	380	1635	5350	2580	450	1085	1155	3300				4	4×35000	4×4.0
ZNX-400/1720	400	1720	5350	2330	550	985	1405	3450	150-125A	7.5	150	4	4×40000	4×4.0
ZNX-420/1830	420	1830	5350	2480	550	1035	1405	3500				4	4×40000	4×4.0
ZNX-450/1936	450	1936	5350	2580	550	1085	1405	3550				6	6×32000	4×3.0

Remark: the date is just for refrence, we reserve the right to make modification without prior notice

Installation and running
Units should be installed at the top of the building or the formation of the bracket the unit axial on the machine’s air vents must be higher or at least equivalent to the top of the revolving round wall, so as to avoid the exclusion of the hot gas to circumfluence
Pipeline: Piping layout should be consistent with specification requirements of the refrigeration cycle pipe installation, and install the balance tube between the condenser and high-pressure receiver to prevent the gas plug making refrigerant back to the condenser
Two or more condensers paralleling connected must follow the principles:
It should be set up an U bending to store liquid at the end of the fluid pipe of condenser
Fluid pipe should have enough vertical riser the height of which is no less than 1500mm
Parallel pipe which is between the receiver and condenser should be connected to the condenser entrance, the function of the fluid tub bending department is setting up certain liquid seal to offset the different pressure between the condenser outlet
Circulating water system
As the spray of water evaporation, minerals and other impurities containing in the water will be left in the tank, should keep regular emissions, to prevent the accumulation of substances, otherwise water acidity or mineral content will be raised, resulting in corrosion and scale
Water Treatment
The simple way is to regularly replace the water tank of water, which can prevent corrosion of steel structure
Using chemicals to deal with lime scale, chemicals must not affect the quality of galvanized unit surface, and PH value of circulating water should be maintained between 6.5～8.0, if PH value is over 8.3, you must wash it, and pay attention to deal with it by acid, but we recommend acid containing inhibitors for galvanized pieces. Related to water treatment program it should be invited experienced company in water treatment, or directly submit the water treatment to company.
Circulating water system antifreeze
The simplest and most effective method of preventing freeze is to install water tank in the house, the level of water in this tank should be lower than the condenser, and all the condensation water can flow to the water receiver in the warm house. In addition, it also can heat the tank with electricity, steam or hot water.
When the temperature is low in winter, it can close the water pumps and only open the fan. In this situation, it should discharge all the water in tank, and be in non-working condition if with electric heating device.
Water accessing to water tanks should be filtrated by filter pack (60 mesh), so as to prevent the spray system to be plugged.
Steel structure bracket:
1 steel support at the top should be flat and level of degree should be no greater than 1.7mm/m.
2 steel support and legs at the end of the installation of bolts is choused by the users and their owned.

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