We all know about space temperature but when it comes humidity not many have a grasp of the subject. This engineering white paper (EWP-7.b) is...

When designing airside systems a change in elevation can significantly alter the results for Psychrometric calculations and Fan selections. For this reason it is important...

The HVAC industry is inundated with heat transfer equipment or heat exchangers. This white paper is designed to make you aware of the most common...

Refrigerants in the HVAC industry are changing. Historically, the focus has been to reduce Ozone Depletion Potential (ODP) by eliminating refrigerants that have Chlorine. In...

Selection software programs abound and each one of our coil manufacturers has their own program to facilitate easy selection & pricing. But what is missing...

Air to Water Heat Pumps have become a dominant technology used to provide building heating and cooling. Since AWHP’s utilize the refrigerant cycle, they can...

Before we can advocate for our customers on HVAC compressorized equipment we must know the basics of the mechanical refrigeration cycle. Mechanical refrigeration is the...

Before we can advocate for our customers on HVAC equipment & system design we must know the basics of Mechanical Engineering. Key to the understanding...

It is easy to understand what each type of fan does by virtue of it is name but knowing when to apply an exhaust fan...

Evaporative cooling is the most energy efficient cooling method, but it also requires a high degree of maintenance in addition to water consumption. The most...

Before we can advocate for our customers on HVAC equipment & system design, we must know the basics of Mechanical Engineering. Key to the understanding...

In EWP 11 (Heat Balance) Ken taught us about the heat balance in water cooled chiller system and why it is important not to just...

The purpose of HVAC equipment is to maintain indoor temperature, humidity and air quality. This is a complex task, and we often need tables and...

Most HVAC equipment generates sound. Even equipment with no moving parts can generate sound- think louvers with too much airflow through them whistling. Sound can...

For anyone familiar with chiller sizing, 2.4 GPM/ton will give you a 10F delta-T across the evaporator. For cooling tower sizing, the rule of thumb...

While we are not electrical engineers or electricians there is a baseline knowledge required of us to ensure our equipment interfaces properly with the buildings...

We sell a lot ABB variable frequency drives as well as variable speed compressors on chillers & rtu’s. It is not often that we have...

We all know about space temperature but when it comes to relative humidity or humidification in general not many have a good grasp on the...

Indoor pools are becoming more popular yet not frequent enough for everyone to stay sharp in the design considerations and rules of thumb. This document...

The purpose of this white paper is to explain the energy code requirements for water‐cooled centrifugal chillers. I often get requests to send IPLV ratings...

When calculating the net capacity of an air handling unit, it is sometimes important to calculate the impact of fan motor heat gain. When working...

When selecting an air handling with two coils in series, we may need to include a minimum 18” access plenum between coils per ASHRAE 62.1-2019...

Recently, I have seen an increase in AHU specifications calling for the AHU manufacturer to be responsible for sizing the base rails so that there...

The energy code requires engineers to meet a minimum airflow rate per unit of fan power. There are two rules based on if the system...

ECM (electronically commutated motor) applications are becoming more prevalent as the motor abilities increase in size and application. VFD (variable frequency drive) motors are applied...