Simulation of an absorption based solar cooling facility using a geothermal sink for heat rejection

An important issue of solar cooling facilities based on absorption cycles and sometimes not given the necessary attention is the recooling process of the absorber and condenser. This is critical in the overall behaviour of the facility because the condensation and absorption temperatures will affect the COP and cooling capacity of the chiller. Most of the time the recooling process is made by using a wet cooling tower in a closed loop through the absorber and condenser. The use of a wet cooling tower gives good results in terms of cooling capacity and COP, but presents some health risk, like legionella, and its use is restricted to the industrial sector and places where water scarcity is not present. This paper presents the modification of the already validated TRNSYS simulation of a solar cooling facility, implementing a geothermal heat sink instead of the wet cooling tower in order to dissipate the heat generated internally in the absorption chiller. Simulation results shows that a geothermal heat sink composed of 6 boreholes of 100 meters of depth should be sufficient in order to substitute the wet cooling tower, for a typical Spanish single family dwelling.Universidad Carlos III de Madrid - ITEA Research GroupPublicad

Ozonation of cooling tower waters

Continuous ozone injection into water circulating between a cooling tower and heat exchanger with heavy scale deposits inhibits formation of further deposits, promotes flaking of existing deposits, inhibits chemical corrosion and controls algae and bacteria

OPTIMALISASI INSTALASI PENGOLAHAN AIR LIMBAH (IPAL) PT. BEHAESTEX PANDAAN- PASURUAN)

PT. Behaestex have had Wastewater Treatment Plant (WWTP) that treatment processes consist of physics-chemical treatment and activated sludge biological treatment. Effluent of WWTP have appropriated for waste water standard according to decision letter of East Java Governor No. 45 in 2002’s, except colour parameter. Effluent of WWTP still have high colour content. Another problem is effluent from physics-chemical treatment still have high pH and temperature. The temperature range is in 35 to 45°C and pH range is in 10 to 11. Optimalization of PT. Behaestex WWTP was done aiming to reduce colour content in wastewater, adjusted to neutral pH between 6,5 to 7,5 and reducing temperature to be less than 30°C. Optimalization that can be done are optimizing coagulation-floculation unit with determination the dosage of coagulant that effective to reduce colour content. Result of optimalization indicated that the most effective coagulant to reduce colour content is ferrous sulfate with 500-6000 mg/l dosage. The type of Cooling tower to be used is induced draft crossflow cooling tower and pH adjustment with sulfate acid 98% with total requirement 35,8 L/day. Key Words : Reducing Colour Content, Coagulation-Floculation, Cooling Tower, pH Adjustmen

Analisis Efektivitas Mesin Cooling Tower Menggunakan Range and Approach

Cooling tower diperlukan di industri pembangkit listrik tenaga panas bumi untuk sirkulasi air pendingin dengan cara mengontakkan dengan gas tak jenuh sehingga sebagian dari zat cair itu akan menguap dan suhu zat cair turun PT Star Energy Geothermal Wayang Windu Ltd menggunakan mesin Cooling tower untuk melakukan pendinginan. untuk mengetahui performansi kemampuan cooling tower yang dimiliki maka diperlukan pengukuran efektivitas.Penelitian ini bertujuan untuk menganalisis efektivitas pendinginan, pengukuran efektivitas dilakukan dengan nilai approach dan range. Range merupakan perbedaan atau jarak antar temperature air masuk dan keluar menara pendingin. Approach adalah perbedaan suhu air dingin keluar menara pendingin dan suhu wetbulb ambient. Metode yang digunakan untuk mengukur performansi Cooling Tower menggunakan metode Overall Equipment Effectivenesss untuk mendapatkan nilai availability, performance efficiency, dan rate of quality.Dari hasil penelitian diperoleh nilai rata-rata OEE mesin cooling tower sebesar > 85% yang berarti telah memenuhi standar world class dan layak untuk dipergunakan, beberapa titik memiliki nilai kurang dari standar dengan nilai terendah 81% disebabkan karena lamanya waktu downtime. Perusahaan perlu menerapkan perawatan preventif yang rutin dan tepat waktu untuk mempertahankan performansi Cooling Tower

STUDY OF COOLING TOWER SYSTEM FOR ENERGY EFFICIENCY OPERATION

This study shows how by reducing the cooling water circulation rate, improves the efficiency ofthe operations in the cooling tower system. This is done without modifying the internals of the current cooling towers such as the fills, water treatment programme and air flow rate. This study is applicable for all existing plants with the cooling tower system. This study shows the redistribution ofcooling water in the cooling tower water network. This study with detail calculations are tested for chillers, distillation condensers and air conditioners. The cooling tower performance curve is used as the tool for this analysis. The benefits of this study are colder cooling water temperature, reduce the compression work of the refrigeration cycle by 3.0 % for every 0.6 C reduction inthe cooling water temperature, reduce the cooling tower water consumption, reduce the cooling tower water treatment chemical consumption, reduce the cooling water circulation pump power consumption, and increase the heat transfer of the distillation condensers (increase production)

Pengaruh Jumlah Sekat Aliran Lapisan Pengisi Terhadap Unjuk Kerja Menara Pendingin (Cooling Tower)

The cooling tower has a working principle for cool the water fluid forcibly using a fan or blower. This Research aims to determine the effect of the number of filler bulkheads and the angle of openingvalve to the cooling tower work efficiency. This research uses type induced draft cooling tower with flow opposite the tool size laboratory scale. Research variables include 3 variations in the number of bulkheads (2 bulkheads, 3 bulkhead and 4 bulkheads) and 3 variations of valve opening angles (30, 45 and 60). Result measurements in the form of water discharge data, water temperature data, air temperature data, temperature data environment (Twb) and temperature difference data. Water discharge data is measured with a flow meter and stop watch. Temperature data measured with a Digital Thermometer. Data were collected 5 times repetition of each data. The measurement results are taken the average value for measures the discharge, temperature, heat transfer rate and efficiency of the cooling tower. The results showed that the number of bulkheads and the angle of the opening valve has an effect on the working efficiency of Cooling Tower which is getting more the greater the number of bulkheads the greater the cooling tower work efficiency and vice versa but the greater the valve opening angle the smaller the cooling tower efficiency.The maximum efficiency obtained from this study is at the number of bulkheads 4 and the valve opening angle of 30 with a Cooling Tower efficiency value of 78.40%