ENERGY SAVING


Q Cooling Capacity (kW) Q Power Input (kW) Q Power Factor Q Heat of Rejection (kW) Q Sub-Cooling / Superheat Values (K) Q Compressor Isentropic Efficiency Q Water In/Out or Air On/Off Temperatures (°C) at the Evaporator


Q Water In/Out or Air On/Off Temperatures (°C) at the Condenser


Q Water or Air Flow Rate (kg/s or m3/s) at the Evaporator and the Condenser


Q SEI: System Efficiency Index. Replaces COP and includes: • Compressor Efficiency • Evaporator Efficiency • Condenser Efficiency.


System abnormalities such as the following can be identified and rectified: Q Cyclic / unstable operation Q Inadequate or excess refrigerant charge Q Undersized evaporator/condenser Q Fouled or blocked evaporator/condenser Q Defective thermostatic expansion valves/EEVs Q Inadequate Evaporator water flow/ condenser air flow rates


Q Incorrect low ambient/head pressure control settings


Q Poor compressor isentropic efficiency, signs of wear or imminent failure


Q Compressor motor overheating.


ClimaCheck Templates cover every type of simple or complex system imaginable with single or multiple compressors of any size and type, economisers, oil coolers, sub-coolers, desuperheaters, suction-liquid interchangers, etc.


The results are available to view as a graph, table, or system schematic view. Here is the System Efficiency Index view: How does this help the field technician? He or she can see literally every salient system parameter, both within the refrigeration circuit, and beyond into the secondary flows, such as the air or water flowing through the evaporator and the condenser, thus being able to identify and correct the following: Q Shortfall on cooling or heating capacity Q Excessive compressor power input Q Compressor operating out of allowable limits, with risk of failure


Q Refrigerant shortage and potential leakage Q Refrigerant under-charge or over-charge Q Excess / inadequate superheat and subcooling


Q TEV / EEV defective operation Download the ACR News app today www.acr-news.com • February 2022 29


Q Cyclic / unstable operation and the cause Q Inefficient or undersized evaporator Q Inefficient or undersized condenser Q Incorrect evaporator airflow or water flow rate


Q Incorrect condenser airflow or water flow rate Q Inadequate or excessive thermal load Q Air recirculation at the condenser.


The field technician can then issue an accurate service visit report to the customer and has a record for the future when revisiting for the next inspection, with ClimaCheck also capable of indirect leak detection. Without this level of field tool, how can our field technicians and angineers stand any chance of ensuring the best possible plant/ system efficiency? What is the point of recording compressor volts and amps on a service visit check sheet, if the kW input power is not, or cannot be calculated? If the cooling capacity and power input are not known, the COP and the system efficiency are also unknown. The unknown compressor performance cannot be compared to the manufacturers stated and rated performance. And so, we have no idea at all as to how well, or just how badly this system is operating. How can we correct this situation? The end-


user pays the energy bill, bearing the cost of his/her RACHP system inefficiency. It is probably true to say that many end-users responsible for RACHP energy consumption and CO2


emissions,


are totally unaware of just how badly a RACHP system can operate if it is not maintained professionally.


An end-user can be forgiven for assuming that if a gas boiler of 95% efficiency delivers a 100kW continuous output, that his or her air conditioning or refrigeration system will also perform at stable efficiency. But we should all know that varying thermal loads and changing ambient temperature across the year have a massive effect on cooling capacity, power input and efficiency/COP and that slight drift on refrigerant charge, EEV/TEV setting and other incorrect operating parameters will cause the system efficiency to fall as much as 30% or more below what it should be! It is this constantly changing set of parameters that makes it very difficult to ensure efficient system operation. ClimaCheck solves this problem. End-users and FM’s must be made aware of this critical need and then appoint professional technicians/engineers with the essential tools and instruments, such as ClimaCheck. Otherwise, it will be the end user and our environment that will end up paying the price! X www.businessedgeltd.co.uk


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