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This system is used in very cold countries to prevent ice build-up in cooling towers. Design New Air-conditioning Systems with Facility for 100% Fresh Air during Winter In air-conditioned systems with centralised AHUs, fresh air and exhaust air ducts can be provided with dampers (and blowers, if necessary) to mix fresh air or use 100% fresh, 38 filtered air, depending on the ambient conditions. These systems should also have the facility to for exhaust the stale, warm air. Such air conditioning systems can be fitted with enthalpy sensors and motorised dampers to have maximize the use of ambient fresh air.

A chiller having a capacity of 75 TR at 57 psig suction pressure will have only 49 TR at 37 psig. Although one 100 HP chiller was switched off permanently, the power saving is 21 kW only. This is because of the fact that the difference in specific power consumption before and after modifications is the deciding factor for energy savings. 5 lakhs θ Actual Investment: Very small θ Payback: Immediate 54 CASE STUDY 2: MATCHING COMPRESSOR CAPACITY TO LOAD BY SPEED VARIATION Speed Reduction Of Compressors To Match Actual Plant Refrigeration Load and Improve Heat Exchanger Heat Transfer Efficacy Equipment Refrigeration compressor Name of Industry/sector Clarisis Organics- Baroda/Chemicals Details of Measure The company situated near Baroda manufactures benzene derivatives.

41 Clean Fouled Heat Exchangers Inefficient operation of refrigeration machines is usually due to fouling of condensers. This happens generally due to the absence of water treatment or poor water treatment practices. Scaling of condenser tubes reduces the heat transfer efficacy, increase the refrigerant temperature and pressure in the condenser, reduces the cooling capacity, increases the power consumption in the compressor. If this problem is ignored, it can also lead to tripping to the compressor on high discharge pressure.

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