HVAC-ENG.COM

With HVACR work being in such high demand, it’s important to stand out from the crowd when applying for a job. A great way to do that is with a quality resume and cover letter. Since these two documents are often the first things that a potential employer

With HVACR work being in such high demand, it’s important to stand out from the crowd when applying for a job. A great way to do that is with a quality resume and cover letter. Since these two documents are often the first things that a potential employer sees about you, catching their attention is critical. With that in mind, here are some tips to build the best resume possible. HVACR Job…

Coolselector®2 (from Danfoss company) helps to optimize energy consumption and increase efficiency in any HVACR system. Run unbiased calculations based on a set of operating conditions — such as cooling capacity, refrigerant, evaporation, and condensation

Coolselector®2 (from Danfoss company) helps to optimize energy consumption and increase efficiency in any HVACR system. Run unbiased calculations based on a set of operating conditions — such as cooling capacity, refrigerant, evaporation, and condensation temperature — and then select the best components for your design. Coolselector Features and benefits  CoolSelector – Professional…

Expansion Valve Selection The expansion valve regulates the amount of compressed liquid refrigerant moving into the evaporator. It removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a gas in the evaporator.

The expansion valve regulates the amount of compressed liquid refrigerant moving into the evaporator. It removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a gas in the evaporator. Thermostatic Expansion Valve There are two types of expansion valves commonly used on air conditioning systems: Internally-equalized valve It receives warm…

corrosion - Uniform corrosion - Pitting corrosion - #Crevice corrosion - #Intergranular corrosion - #Selective corrosion - #Erosion corrosion - #Cavitation corrosion - #Stress corrosion cracking (SCC) - Corrosion #fatigue - #Galvanic #corrosion

Corrosion is usually referred to as the degradation of the metal by chemical or electrochemical reaction with its environment, see figure 1. When considered broadly, corrosion may be looked upon as the tendency of the metal to revert to its natural state similar to the oxide from which it was originally melted. Only precious metals, such as gold and platinum are found in nature in their metallic…

Long-coupled pumps are pumps with a flexible coupling that connects the pump and the motor. Close-coupled pumps can be Either the pump has the impeller mounted directly on the extended motor shaft or ...

Long-coupled pumps are pumps with a flexible coupling that connects the pump and the motor. This kind of coupling is available either as a basic coupling or as a spacer coupling. If the pump is connected to the motor by a basic coupling, it is necessary to dismount the motor when the pump needs service. Therefore, it is necessary to align the pump upon mounting. Long-coupled pump with basic…

Single and Multi Stage Pumps Generally, single-stage pumps are used in applications, which do not require a total head of more than 150 m. Normally, single-stage pumps operate in the interval of 2-100 m. #Pump #singlestagepump #multistagepump

Generally, single-stage pumps are used in applications, which do not require a total head of more than 150 m. Normally, single-stage pumps operate in the interval of 2-100 m. Single-stage pumps are characterized by providing a low head relative to the flow, see figure 1. The single-stage pump comes in both a vertical and a horizontal design. Vertical multistage in-line pump with return channel…

Pump construction and types part2 In the continuation of the investigation of the building and types of pumps, this post. The centrifugal pump has several characteristics and in this section, we will present the most important ones.

In the continuation of the investigation of the building and types of pumps, this post. The centrifugal pump has several characteristics and in this section, we will present the most important ones. Later on in this part we will give a more thorough description of the different pump types. https://hvac-eng.com/pump-construction-part1/ Characteristics of the centrifugal pump The number of…

Pump construction and types The centrifugal pump provides a steady liquid flow, and it can easily be throttled without causing any damage to the pump. #pump #CentrifugalPump

In 1689 the physicist Denis Papin invented the centrifugal pump and today this kind of pump is the most used around the world. The centrifugal pump is built on a simple principle: Liquid is led to the impeller hub and by means of the centrifugal force it is flung towards the periphery of the impellers. The construction is fairly inexpensive, robust and simple and its high speed makes it possible…

To provide some redundancy in the HVAC design, most designers will require two or more chillers. Multiple chillers also offer the opportunity to improve on overall system part load performance and reduce energy consumption. #chiller #hvac #design

To provide some redundancy in the HVAC design, most designers will require two or more chillers. Multiple chillers also offer the opportunity to improve on overall system part load performance andreduce energy consumption. Parallel chiller plants are straightforward to design and are easily modified for variable primary flow. Rooftop cooling unit with chiller units and compressors. Basic…

Silencer Types and Applications (HVAC) Selection of quieter equipment can eliminate many noise problems before they even begin. #HVAC #Noise #Silencer

Selection of quieter equipment can eliminate many noise problems before they even begin. Treatment options along the path are the next best option and can include silencers, barriers, absorption, lagging, or other options. The last resort is typically treatment at the receiver, with hearing protection for loud occupational exposure. Octave band frequency (Hz) Approaches to Noise Control Sound…

Carrier PLV Pro download Carrier’s PLV Pro is a software tool that empowers consulting engineers to make objective and informed decisions about their chiller plant design that go beyond Full Load and IPLV metrics. #HVAC #Download #Software #Chiller

Carrier’s PLV Pro is a software tool that empowers consulting engineers to make objective and informed decisions about their chiller plant design that go beyond Full Load and IPLV metrics. Results are provided in a professional report or .csv format for further analysis. The tool is for professionals who need a quick and free-of-charge alternative to detailed energy modeling analyses. PLV Pro…

CAV systems deliver constant supply airflow at a variable temperature. VAV systems deliver variable supply airflow at a constant temperature. #HVAC #AirFlow #Design

HVAC air systems can be either centralized or decentralized. Centralized air systems receive their cooling and heating energy from a remote central plant. Decentralized HVAC air systems contain the central heating and cooling plant equipment within the air system itself. HVAC air systems can also be constant air volume (CAV) or variable air volume (VAV). CAV systems deliver constant supply…

This article will describe Capacity Control Methods in free cooling design schemes for cooling towers.The sequence of control for a cooling tower operating during low ambient conditions is much the same as ... #CoolingTower #HVAC #Energy #FreeCooling

Free cooling systems can generate significant savings for the owners of such systems. However, the amount of potential energy savings available depends almost totally on the overall system design and on the selection of equipment for use in the system. In general, the designer must balance higher equipment cost with greater opportunity for energy savings. Fortunately, these savings — and their…

When a requirement for free cooling is specified for a project utilizing cooling towers, certain considerations must be made from the very beginning of the project design. #HVAC #CoolingTower #Piping

Cooling towers are used to dissipate heat from air conditioning or industrial process systems. Many of the air conditioning systems currently in use only operate during the summer cooling season, but there are numerous air conditioning and process systems that require cooling year-round. In some cases, the entire cooling system is required to operate during the winter. The cooling tower is…

Stainless steel is the most cost effective material of construction available to extend the life of a cooling tower, closed circuit cooler or evaporative condenser in HVAC-R industry. #StainlessSteel

Stainless steel is the most cost effective material of construction available to extend the life of a cooling tower, closed circuit cooler or evaporative condenser in HVAC-R industry. By definition, stainless steel is a group of iron-based alloys which contain a minimum of 10.5% chromium. Type 304 stainless steel is a basic chromium-nickel austenitic stainless steel and is suitable for a wide…

This article is a continuation of our older article, which was well received by users, so we decided to update the P-H Diagram list and provide you with a more complete list of the world's commercial refrigerants. #refrigerants #refrigeration

The pressure-enthalpy diagram is the most common graphical tool for analysis and calculation of the heat and work transfer and performance of a refrigeration cycle. The change in pressure can be clearly illustrated on the p-h diagram. Also, both heat and work transfer of various processes can be calculated as the change of enthalpy and at easily shown on the p-h diagram. P-h enthalpy diagram…

Pack Calculation Pro is an application for comparing the yearly energy consumption of refrigeration systems and heat pumps. Among other features, transcritical CO2 systems can be compared with traditional systems. #refrigeration #software

Pack Calculation Pro is an application for comparing the yearly energy consumption of refrigeration systems and heat pumps. Among other features, transcritical CO2 systems can be compared with traditional systems. The application compares different systems based on a geographical location. Pack Calculation Pro is designed to compare different system designs, control strategies and refrigerants…